DEPARTMENT OF LABOR
AND ECONOMIC GROWTH LICENSING AND REGULATORY AFFAIRS
PUBLIC SERVICE COMMISSION
TECHNICAL STANDARDS FOR GAS SERVICE
Filed with the secretary of state on
These rules become effective immediately upon filing with the secretary of state unless adopted under sections 33, 44, or 45a(6) of the administrative procedures act of 1969, 1969 PA 306, MCL 24.233, 24.244, or 24.245a. Rules adopted under these sections become effective 7 days after filing with the secretary of state.
(By authority conferred on the public service
commission by sections 4 and 6 of 1939 PA 3, Act No. 3 of the
Public Acts of 1939MCL 460.4 and 460.6, as amended, and
section 2 of Act No. 165 of the Public Acts of 1969 PA 165,
being SS460.6 and 483.152 of the Michigan Compiled Laws)MCL 483.152,
section 5 of 1919 PA 419, MCL 460.55, sections 3, 9, and 231
of the executive organization act of 1965, 1965 PA 380, MCL 16.103,
16.109, and 16.331, and section 2(12) of 1909 PA 300, MCL 462.2(12), and
Executive Reorganization Order Nos. 1996-2, 2003-1, 2008-4, and 2011-4, MCL
445.2001, 445.2011, 445.2025, and 445.2030)
R 460.2301, R 460.2302, R 460.2321, R 460.2323, R 460.2331, R 460.2332, R 460.2333, R 460.2335, R 460.2341, R 460.2351, R 460.2353, R 460.2354, R 460.2355, R 460.2362, R 460.2363, R 460.2371, R 460.2373, R 460.2381, R 460.2382, and R 460.2383 of the Michigan Administrative Code are amended, R 460.2324, R 460.2344, R 460.2345, and R 460.2351a are added, and R 460.2342, R 460.2352, R 460.2361, R 460.2364, and R 460.2374 are rescinded, as follows:
PART 1. GENERAL PROVISIONS
R 460.2301 Definitions.
Rule 1. As used in these rules:
(a) “Acceptable to the commission” or “Approved
by the commission” or “authorized by the commission” means that a
commission order has been obtainedissued.
(c) “Commission” means the Michigan public service commission.
(d) “Cubic foot of gas” means either of the following:
(i) For billing purposes, a standard cubic foot of gas is
that quantity of dry gas which, that, at a temperature of 60
degrees Fahrenheit and an absolute pressure of 14.65 pounds per square inch,
occupies 1 cubic foot. The commission may, however, approve a different
absolute pressure base.
(ii) For testing purposes, such as testing for
heating value, a standard cubic foot of gas is that quantity of gas which,
that, when saturated with water vapor at a temperature of 60 degrees
Fahrenheit and an absolute pressure of 14.73 pounds per square inch, occupies 1
cubic foot.
(e) “Customer” means an individual, firm,
association, or corporationbusiness, excluding other gas
utilities, or any agency of the federal, state, county, or municipal
government that purchases or otherwise receives gas or
transportation services, or both, on the utility’s system.
(f) “Hazardous condition” means any condition which
that the utility determines poses an immediate and serious threat to the
health, safety, or welfare of a customer or the general public and which
that requires immediate action.
(g) “Liquefied petroleum gas-air mixture” means
a gas that is produced by mixing
an appropriate quantity of air with propane vapor,
butane vapor, or a mixture of such
vapors.
(h) “Meter” means, unless otherwise
qualified, a device ofowned by a utility that is used
in measuring a quantity of gas.
(ih) “Meter accuracy” means the
volume that is measured by a meter as a percent of the actual volume that
flowed through the meter as measured by a working standard.
(i) “Meter error” means a failure to accurately measure and record all of the natural gas used that is required by the applicable rate or rates.
(j) “Mixed gas” means a gas that is produced by mixing natural gas with any of the following:
(i) Air.
(ii) Inert gas.
(iii) Liquefied petroleum gas.
(iv) Liquefied petroleum gas-air mixture.
(v) Other flammable gas.
(vi) Substitute natural gas.
(k) “Premises” means an individual piece of land
or real estate that is not separated by public roads, streets, or alleys,
including buildings and other appurtenances thereon on that land or
real estate.
(l) “Potentially hazardous condition” means any
condition which that the utility determines has the potential to
become a hazardous condition, but which that does not require
immediate action. All of the following are examples of potentially hazardous
conditions, including, but not limited to, any of the following:
(i) Customer failure to permit the utility to perform inspections and maintenance on the utility’s facilities in or on the customer’s premises.
(ii) Customer alterations or modifications of the utility’s facilities located in or on the customer’s premises.
(iii) Customer construction of a structure or
appurtenance near or over the main, service line piping, or meter set assembly
so that the utility’s facilities are not in compliance with the provisions of R
460.14001460.20101 to R 460.20606 of the Michigan gas safety
standards et seq. of the Michigan Administrative Code or the utility’s
standards.
(iv) Customer failure to correct or replace gas utilization equipment or gas fuel line piping that has been previously identified and classified as potentially hazardous by the utility.
(m) “Rate book” means the assembled rate schedules, rules, regulations, and standard forms of the utility as filed with the commission and available on the commission’s website.
(n) “Required access” means access that is necessary to conduct any of the following:
(i) Routine inspections and maintenance.
(ii) Meter readings of gas usage.
(iii) Scheduled replacement, repairs, relocation, or disconnection of branch service lines or other changes with respect to service lines and meter assembly piping.
(o) “Substitute natural gas” means gas which
that is interchangeable and compatible with natural gas and which
that is manufactured from carbon and hydrogen-bearing materials.
(p) “Utility” means a person, firm, corporation, cooperative,
association, or agency which that is subject to the jurisdiction
of the commission and which that delivers or distributes and
sells gas to the public for heating, power, or other residential, commercial,
or industrial purposes.
R 460.2302 Application, intention, and interpretation of rules; utility rules and regulations.
Rule 2. (1) These rules apply to a gas utility whichthat
operates within the state of Michigan and whichthat is
subject to the jurisdiction of the commission.
(2) These rules are intended to promote safe and adequate gas service to the public, to provide technical standards for uniform and reasonable practices by gas utilities, to encourage efficiency and economy, and to establish a basis for determining the reasonableness of such demands as may be made by the public upon gas utilities.
(3) Questions that concern the application or
interpretation of these rules and disagreements with respect to any service
rules and regulations that are promulgated by a gas utility shall be
referred to the commission for a ruling.
(4) A utility shall adopt reasonable rules and
regulations, subject to commission approval, governing its relations with
customers. The rules and regulations shallmust not be
inconsistent with these rules and any other rules of the commission as may
be promulgated from time to time. A utility’s rules and regulations shallmust
constitute an integral part of the utility’s rate book.
(5) Upon written request of a customer, utility, or on its own motion, the commission may waive any requirements of these rules when it determines the waiver will further the effective and efficient administration of these rules and is in the public interest.
PART 2. RECORDS, REPORTS, AND OTHER INFORMATION
R 460.2321 Retention of records.
Rule 21. All records that are required to be made
or maintained pursuant to these rules shallmust be preserved by
the utility for a period of time specified in R 460.2501 et seq. of the
Michigan Administrative Codeto R 460.2582. If a time period is not
specified in these
rules or in R 460.2501 et seq.to R 460.2582,
all records shallmust be preserved by the utility for,
not less thanat a minimum, 1 year after the records are
completed.
R 460.2323 Reports and records generally.
Rule 23. (1) Volumetric data that is contained in
any report which is filed with the commission shallmust define
the pressure, temperature, and water saturation upon which the data is based.
(2) In addition to reports or records that are required
to be filed with the commission pursuant to these rules, a utility shall
provide the commission with a current list of the name, title, address, and
telephone number, and email address of the person who should be
contacted in connection with all of the following:
(a) General management duties.
(b) Customer complaints that relate to operations.
(c) Construction, maintenance, operations, and emergencies during office and nonoffice hours for each major operating headquarters.
(d) Meter tests and repairs.
R 460.2324 Security reporting.
Rule 24. (1) To inform the commission regarding matters that may affect the security or safety of persons or property, whether public or private, a utility must do both of the following:
(a) Provide a written or oral annual report, individually or jointly with other utilities, to designated members of the commission staff regarding the utility’s cybersecurity program and related risk planning. This report on the threat assessment and preparedness strategy must contain all of the following information:
(i) An overview of the program describing the utility’s approach to cybersecurity awareness and protection.
(ii) A description of cybersecurity awareness training efforts for the utility’s staff members, specialized cybersecurity training for cybersecurity personnel, and participation by the utility’s cybersecurity staff in emergency preparedness exercises in the previous calendar year.
(iii) An organizational diagram of the utility’s cybersecurity organization, including positions and contact information for primary and secondary cybersecurity emergency contacts.
(iv) A description of the utility’s communications plan regarding unauthorized actions that result in loss of service, financial harm, or breach of sensitive business or customer data, including the utility’s plan for notifying the commission and customers.
(v) A redacted summary of any unauthorized actions that resulted in material loss of service, financial harm, or breach of sensitive business or customer data, including the parties that were notified of the unauthorized action and any remedial actions undertaken.
(vi) A description of the risk assessment tools and methods used to evaluate, prioritize, and improve cybersecurity capabilities, including work completed pursuant to R 460.2345.
(vii) General information about current emergency response plans regarding cybersecurity incidents, domestic preparedness strategies, threat assessments, and vulnerability assessments.
(b) In addition to the information required under subdivision (a) of this subrule, an investor-owned public utility must include in its annual report to the Michigan public service commission an overview of major investments in cybersecurity during the previous calendar year and plans and rationale for major investments in cybersecurity anticipated for the next calendar year.
(a) A person intentionally interrupted the production, transmission, or distribution of natural gas.
(b) A person extorted money or other things of value from the utility through a cybersecurity attack.
(c) A person caused a denial of service in excess of 12 hours.
(d) A security breach, as defined by section 3(b) of the identity theft protection act, 2004 PA 452, MCL 445.63(b), prior to public and customer notification.
(e) At the utility’s discretion, any other cybersecurity incident, attack, or threat that the utility deems notable, unusual, or significant.
(3) As used in subrule (2) of this rule, “person” means any individual, firm, corporation, educational institution, financial institution, governmental entity, or legal or other entity.
(4) As used in subrule (2)(c) of this rule, “denial of service” means, for a utility, a successful attempt to prevent a legitimate user from accessing electronic information made accessible by the utility or by another party on the behalf of the utility.
PART 3. SERVICE REQUIREMENTS
R 460.2331 Sale of gas.
Rule 31. (1) All gas that is sold by a utility
shall must be on the basis of meter measurement, unless otherwise authorizedapproved
by the commission.
(2) The utility shall provide the characteristicsterms
and conditions of service available to prospective customers upon request.
(3) If gas is supplied and metered to a customer at a nominal delivery pressure of 0.25 pounds per square inch gauge, then, for billing purposes, both of the following provisions apply:
(a) The gas volume that is registered by the meter
is assumed to be measured at standard billing conditions as defined in R
460.2301(d)(i), regardless of the actual temperature of the gas or actual
atmospheric pressure. However, aAll meters whichthat are
to operate at ambient outdoor conditions and which are installed after the
effective date of this subrule shallmust be installedequipped
with a temperature-compensating device.
(b) If the billing pressure base is 14.65 pounds per square inch absolute, then the atmospheric pressure is assumed to be 14.4 pounds per square inch absolute. If the commission has approved a different billing pressure base, then the assumed atmospheric pressure is equal to the difference between such absolute billing pressure base and 0.25 pounds per square inch.
(4) If gas is supplied to a customer through a
low-pressure distribution system such that a service regulator is not used
before metering, then, for billing purposes, the gas shallmust be
assumed to be supplied and metered at 0.25 pounds per square inch gauge. The
low-pressure system shallmust be operated so that the gauge
pressure at the outlet of the meter shallmust be maintained
within a range of 3 inches water column minimum to a maximum of 14 inches water
column. However, delivery to the customer may be as high as 18 inches water
column if the pressure to the appliancesgas utilization equipment is
regulated to not more than 14 inches water column. A utility may implement
different standards for operating its low-pressure system if those standards
are approved by the commission.
(5) If gas is supplied and metered to a customer at a nominal delivery pressure of more than 0.25 pounds per square inch gauge, then, for billing purposes, all of the following provisions apply:
(a) The gas volume that is measured by the meter shallmust
be corrected to standard billing conditions as defined in R 460.2301(d)(i).
(b) Gas volume corrections for temperature shallmust
be made in accordance with pursuant to Charles’ law. Gas
volume corrections for pressure shallmust be made in
accordance with pursuant to Boyle’s law. Gas volume corrections for
supercompressibility shallmust be made in accordance with pursuant
to either of the following publications of the American gas association
(AGA), both of which are adopted by reference in R 460.2344 these
rules and may be purchased at the cost specified as of the time of adoption of
these rules (which is subject to change) from the American Gas Association,
1515 Wilson Boulevard, Arlington, VA 22209, (703) 841-8558, or from the
Michigan Public Service Commission, 6545 Mercantile Way, P.O. Box 30221,
Lansing, MI 48909:
(i) “Manual for the Determination of
Supercompressibility Factors, for Natural Gas, Project NX-19,” PRCI
Project NX-19”(1962) (A.G.A. Catalog No. L00340). . $35.00. as
adopted by reference in R 460.2344.
(ii) “American Gas Association (AGA) Report No.
8, Part 1, “Thermodynamic Properties of Compressibility and
Supercompressibility for Natural Gas and Other Related Hydrocarbon
Gases, Transmission Measurement Committee Report No. 8,” (1992) (A.G.A.
Catalog No. . . . . . .. .$80.00 ($40.00 for AGA members) DETAIL and
GROSS Equations of State.” (2017) AGA Catalog No. XQ1704-1 as adopted
by reference in R 460.2344.
(c) If the pressure at which the gas is metered is
established on a gauge basis rather than an absolute basis, then the absolute
pressure at which the gas is metered shallmust be inferred by
summing the gauge pressure and either the actual atmospheric pressure or a
reasonable estimate thereof or an atmospheric pressure that is filed with, and
approved by, the commission.
(d) If a pressure-compensating device is used with
the meter, the device shallmust be calibrated using the actual
atmospheric pressure or a reasonable estimate thereof.
R 460.2332 Permanent sService line rulestariffs.
Rule 32. Within 30 days after a company commences
operating as a gas utility, the utility shall file its service line installation
rulestariffs for commission approval. Such rules and regulationsThese
tariffs shallmust constitute an integral part of the utility’s
rate book.
R 460.2333 Main extension rulestariffs.
Rule 33. Within 30 days after a company commences
operating as a gas utility, the utility shall file its main extension rulestariffs
for commission approval. Such rules and regulations These tariffs shallmust
constitute an integral part of the utility’s rate book.
R 460.2335 Interruptions of service.
Rule 35. (1) This rule does not apply to service
interruptions that result from a utility’s implementation of the provisions
of R 460.2101 et seq. of the Michigan Administrative Code or a utility’s
shutoff of service due to nonpayment of bills, unauthorized use of gas
service, or pursuant to the provisions of R 460.2371 toand R
460.23742373.
(2) A utility shall make a reasonable effort to
prevent interruptions of service and, when such interruptions occur, shall
endeavor to reestablish service with the shortest possible delay consistent
with the safety of its customers, its employees and others engaged in work for
the utility, and the general public. If service is necessarily interrupted for
the purpose of working on the distribution system or plant equipment, it shallmust
be done at a time that causes the least inconvenience to customers, and
those customers who may be seriously affected shall be notified in advance.
(3) If the supply of gas diminishes to the point where continuous service to customers is threatened, the utility may limit or shut off service to its customers pursuant to curtailment procedures approved by the commission.
(4) A utility shall keep records of major
interruptions of service reportable outages on its entire system or
in major divisions or operating districts thereof of its system.
The records shallmust include a statement of the time, duration,
and cause of the interruption. A utility shall report interruptions of
service, as required by R 460.14001 et seq. of the Michigan Administrative
Code460.20101 to R 460.20606 and shall periodically make an analysis
of the records for the purpose of determining to determine steps
to be taken to prevent the recurrence of such these interruptions.
PART 4. ENGINEERING
R 460.2341 Gas facilities; construction and installation.
Rule 41. (1) Gas facilities of a utility shall
must be constructed and installed in accordance with pursuant
to accepted engineering practices in the gas industry and R 460.20101 to
R 460.20606 to ensure, to the extent reasonably practicable, continuity of
service, uniformity in the quality of service provided, and the safety of
persons and property.
(2) All new meters must conform to 1 of the following standards adopted by reference in R 460.2344:
(a) American National Standards Institute (ANSI) B109.1-2019 for Diaphragm-Type Gas Displacement Meters (Under 500 Cubic Feet per Hour Capacity).
(b) ANSI B109.2-2000 (R2008) for Diaphragm-Type Gas Displacement Meters (500 Cubic Feet per Hour Capacity and Over).
(c) ANSI B109.3-2019 for Rotary Type Gas Displacement Meters.
(d) AGA Report No. 3, Orifice Metering of Natural Gas Part 2: Specifications and Installation Requirements.
(e) AGA Report No. 7, Measurement of Gas by Turbine Meter.
(f) AGA Report No. 9, Measurement of Gas by Multipath Ultrasonic Meters.
(g) AGA Report No. 11, Measurement of Natural Gas by Coriolis Meter, Second Edition.
R 460.2342 Standards of accepted engineering
practice Rescinded.
Rule 42. Unless otherwise specified by the
commission, a utility shall use the publications listed below as standards of
accepted practice:
(a) The current edition of the Michigan gas
safety code, R 460.14001 et seq. of the Michigan Administrative Code, which may
be ordered from the Michigan Public Service Commission, 6545 Mercantile Way,
P.O. Box 30221, Lansing, MI 48909.
(b) The following American national standards
institute (ANSI) publications, which are adopted by reference in these rules
and which may be purchased at the specified cost as of the time of adoption of
these rules (which is subject to change) from the American National Standards
Institute, 1430 Broadway, New York, New York 10018, (212) 642-4900, or from the
American Gas Association (AGA), 1515 Wilson Boulevard, Arlington, VA 22209,
(703) 841-8558, or from the Michigan Public Service Commission, 6545 Mercantile
Way, P.O. Box 30221, Lansing, MI 48909:
(i) ANSI/API 2530, “Orifice Metering of Natural
Gas and Other Related Hydrocarbon, A.G.A. Report No. 3,” as follows:
(A) Part I, “General Equations and Uncertainty
Guidelines,” (1990)(A.AG.A. Catalog No. XQ9017) $55.00 from ANSI or $50.00 from
AGA ($40.00 for AGA members).
(B) Part II, “Specification and Installation
Requirements,” (1991) (A.G.A Catalog No. XQ9104) $55.00 from ANSI or $50.00
from AGA ($40.00 for AGA members)
(C) Part III, “Natural Gas Applications,” (1992)
(A.G.A. Catalog No. XQ9210) $65.00 from ANSI or $50.00 from AGA ($40.00 for AGA
members)
(D) Part IV, “Background Development,
Implementation Procedures, and Sub Routine Documentation for Emperical Flange-Tapped
Discharged Coefficient Equation,” (1992) (A.G.A. Catalog No. XQ9211) $50.00
from AGA ($40.00 for AGA members).(ii) ANSI B109.1, “Diaphragm Type – Gas
Displacement Meters, Under 500 Cubic Feet per Hour Capacity,” (1992) (A.G.A.
Catalog No. X69218) $20.00 from ANSI or $20.00 from AGA ($10.00 for AGA
members).
(iii) ANSI B109.2, “Diaphragm Type – Gas
Displacement Meters, 500 Cubic Feet per Hour Capacity and Over,” (1992) (A.G.A.
Catalog No. X69219) $20.00 from ANSI or $20.00 from AGA ($10.00 for AGA
members).
(iv) ANSI B109.3, “Gas Displacement Meters,
Rotary Type,” (1992) (A.G.A. Catalog No. X69220) $20.00 from ANSI or $20.00
from AGA ($10.00 for AGA members).
(v) ANSI Z223.1 National Fuel Gas Code – 1992
edition, which may also be purchased from the American Society of Mechanical
Engineers, 345 East 47th Street, New York, NY 10017, (212) 705-7722, or from
the National Fire Protection Association (NFPA), P.O. Box 9146, Quincy, MA
02269, (800) 344-3555 $24.50 ($22.00 for NPFA members).
(c) The following national fire protection
association standards, which are adopted by reference in these rules and which
may be purchased at the specified cost as of the time of adoption by reference
in these rules and which may be purchased at the specified cost as of the time
of adoption of these rules (which is subject to change) from the National Fire
Protection Association, P.O. Box 9146, Quincy, MA 02269, (800) 344-3555, or
from the Michigan Public Service Commission, 6545 Mercantile Way, P.O. Box
30221, Lansing, MI 48909:
(i) “NFPA Standard 58, Storage and Handling of
Liquefied Petroleum Gases,” (1992) $24.50 ($22.00 for NFPA members).
R 460.2344 Adoption of standards by reference.
Rule 44. (1) The publications and standards listed in this rule are adopted by reference and are a part of these rules. Publications identified as published by a specific organization are available from the organization at the address specified in this rule. All prices are current at the time of the adoption of these rules. The commission also has copies of the publications available for inspection and distribution at its offices located at 7109 W. Saginaw Highway, Lansing, Michigan 48917 at a cost of 10 cents per page unless otherwise specified in this rule.
(2) The numbers in parentheses following the publications adopted by reference indicate the applicable editions.
(a) The current edition of the Michigan gas safety standards, which is available online at www.michigan.gov/mpsc or may be ordered from the Michigan public service commission. $61.49.
(b) The following publications of the American Gas Association (AGA), available from the American Gas Association, 400 North Capitol Street, NW, Suite 450, Washington, DC 20001, 202-824-7000, www.aga.org:
(i) “Manual for the Determination of Supercompressibility Factors, PRCI Project NX-19,” (1970) AGA Catalog No. L00340. $149.00.
(ii) AGA Report No. 8, Part 1, “Thermodynamic Properties of Natural Gas and Related Gases, DETAIL and GROSS Equations of State.” (2017) AGA Catalog No. XQ1704-1. $320.00.
(iii) AGA Report No. 3, “Orifice Metering of Natural Gas Part 1: General Equations and Uncertainty Guidelines.” (2013, includes errata) AGA Catalog No. XQ1201. $168.00.
(iv) AGA Report No. 3, Part 2, “Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids – Concentric, Square-edged Orifice Meters, Specifications and Installation Requirements.” (2017, includes errata) AGA Catalog No. XQ1601. $168.00.
(v) AGA Report No. 3, “Orifice Metering of Natural Gas Part 3: Natural Gas Applications.” (2013) AGA Catalog No. XQ1304. $148.00.
(vi) AGA Report No. 3, “Orifice Metering of Natural Gas Part 4: Background, Development, Implementation Procedures.” (1992) AGA Catalog No. XQ9211. $148.00.
(vii) American National Standards Institute (ANSI) B109.1-2019, “Diaphragm-Type Gas Displacement Meters, Under 500 Cubic Feet per Hour Capacity.” AGA Catalog No. X61902. $110.00.
(viii) ANSI B109.2-2000 (R2008), “Diaphragm-Type Gas Displacement Meters, 500 Cubic Feet per Hour Capacity and Over.” AGA Catalog No. XQ0009. $110.00.
(ix) ANSI B109.3-2019, “Rotary Type Gas Displacement Meters.” (2000) AGA Catalog No. XM1901. $110.00.
(x) AGA Report No. 7, “Measurement of Gas by Turbine Meter.” (2006) AGA Catalog No. XQ0601. $352.00.
(xi) AGA Report No. 9, “Measurement of Gas by Multigraph Ultrasonic Meters.” (2017) AGA Catalog No. XQ1705. $400.00.
(xii) AGA Report No. 11, “Measurement of Natural Gas by Coriolis Meter, Second Edition.” (2013) AGA Catalog No. XQ1301. $440.00.
(xiii) National Fuel Gas Code. (2018) AGA Catalog No. Z223118. $60.00.
(c) The following publications of the American Society for Testing and Materials (ASTM) International available from ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA, 19428, 610-832-9585, www.astm.org:
(i) ASTM D1826-94, “Standard Test Method for Calorific (Heating) Value of Gases in Natural Gas Range by Continuous Recording Calorimeter.” (2017) ASTM Catalog No. D-1826. $46.00.
(ii) ASTM D1945-14, “Standard Test Method for Analysis of Natural Gas by Gas Chromatography.” ASTM Catalog No. D-1945. $52.00.
(iii) ASTM D3588-98, “Standard Practice for Calculating Heating Value, Compressibility Factor, and Relative Density of Gaseous Fuels.” (2017) ASTM Catalog No. D-3588. $46.00.
(d) The following publications of the American Society for Quality (ASQ) available from American Society for Quality, PO Box 3005, Milwaukee, WI 53201, 800-248-1946, www.asq.org:
(i) ANSI/ASQ Z1.9-2003 (R2018), “Sampling Procedures and Tables for Inspection by Variables for Percent Nonconforming.” $149.00.
(ii) ANSI/ASQ Z1.4-2003 (R2018), “Sampling Procedures and Tables for Inspection by Attributes.” $159.00.
(e) American Petroleum Institute (API) Standard 1164 Ed. 2 (2009/R2016), “Pipeline SCADA Security,” available from API Publishing Services, 1220 L Street, NW, Washington DC 20005. $146.00.
R 460.2345 Security standards.
Rule 45. Unless otherwise approved by the commission, all utilities utilizing supervisory control and data acquisition systems shall implement API Standard 1164 Ed. 2 (2009/R2016), as adopted by reference in R 460.2344.
PART 5. INSPECTION
OF METERS METERING EQUIPMENT INSPECTIONS AND TESTS
R 460.2351 Meters and associated metering devices;
inspections; and tests; and records.
Rule 51. Inspections and tests of meters and
associated metering devices shallmust be made by, or on behalf
of, each utility as follows:
(a) A meter or an associated metering device that
is not included as a part of the meter, or both, shallmust be
inspected and tested before being placed in service, and the error shallmust
not be not more than 1.0%. In place of this requirement, methods
of sample testing that are acceptable to the commission may be used.
(b) A meter or an associated metering device, or
both, shallmust be tested after it is removed from service. SuchThese
tests shallmust be made before the meter or associated metering
device is adjusted, repaired, or retired.
(c) A repaired meter or a meter that is removed
from service shallmust be leak-tested before being returned to
service, subject to the following requirements:
(i) If tested in the field, a meter shallmust
be tested at the actual meter operating pressure of the system.
(ii) If tested in the shop, a meter shallmust
be subjected to an internal pressure test of, at a minimum, not
less than 3.0 pounds per square inch gauge pressure. and, in In
addition, any meter that will operate above 3.0 pounds per square inch
gauge pressure shallmust be so marked on the meter and shallmust
be subjected to 1 of the following tests:
(A) An internal pressure test of, at a minimum,
not less than the manufacturer’s rated operating pressure.
(B) An internal pressure test at 10% above the maximum operating pressure to which the meter could be subjected.
(C) Any suitable test that is acceptable toapproved
by the commission.
(iii) During the pressure test, the meter shallmust
be checked for leaks by 1 of the following tests:
(A) Immersion test.
(B) Soap test.
(C) Pressure drop test of a type that is acceptable
toapproved by the commission.
(d) As part of its rate book, a utility shall file, for commission approval, a statement of its policy with regard to testing meter accuracy upon a customer’s request. In the absence of a filed policy approved by the commission, the utility shall adhere to both of the following provisions:
(i) A utility shall test meter accuracy upon the
request of a customer if the customer does not request a test more than once
every 2 years and if the customer agrees to accept the results of the test as
the basis for determining the difference claimed. A charge shall must
not be made to the customer for the first test in any 5-year period, but if
subsequent tests during the same period, for the same customer, show the meter
to be within the allowable limits of accuracy, the utility may charge the
customer an amount for subsequent tests which is uniform and which does not
exceed the utility’s direct cost thereof, plus a reasonable charge for
administrative overhead. The customer may be present at the test if he or she
makes a request before the test.
(ii) A written report shallmust be
made to the customer by the utility. The report shallmust state
the results of the test. A record of the test shallmust be kept
by the utility.
(e) A utility shall make periodic tests of meters,
associated devices, and instruments to ensure their accuracy. The tests shallmust
be conducted according to the following schedule, unless otherwise authorizedapproved
by the commission. A utility may test meters more frequently than
provided in the following schedule without commission approval:
(i) Positive displacement diaphragm-type meters
that have capacities of less than 500 cubic feet per hour and under
10 years, not to exceed 123 months.
(ii) Positive displacement diaphragm-type meters
that have capacities over 500 cubic feet per hour 7 years, not to
exceed 87 months.
(iii) Rotary meters that have capacities of less than 15,000 cubic feet per hour, which may be tested in place, not to exceed 51 months.
(iv) Rotary meters that have capacities of 15,000 cubic feet per hour or more, which may be tested in place, not to exceed 27 months.
(v) Other meter types, such as proportional,
rotary, and turbine, Coriolis, 4-Path or greater ultrasonic, or other
metering technology, which may be tested in place when possible 2 years,
not to exceed 27 months.
(ivi) Orifice meters 6 months,
2 times per year with intervals not to exceed 7.5 months.
(vii) Gas instruments, such as base volume,
base pressure, and base temperature-correcting devices, shallmust be
removed and checked for calibration at intervals that correspond to the
schedule for their associated meters and shall be checked for calibration in
place at intervals of not more than 2 years. The testing interval must
not exceed 51 months.
(viii) Test bottles, 1 cubic foot 10
years deadweight testers, certified test meters, not to exceed 123
months.
(vii) Deadweight testers 10 years.
(viii) Certified test meters 10 years.
(ix) Meter testing systems shallmust be
calibrated when first installed and after alterations, damages, or repairs that
might affect accuracy. To assure ensure that the accuracy of a
meter testing system is maintained on a continuous basis, a daily leakage test shallmust
be made and a weekly accuracy test with a comparison meter of known
accuracy shallmust be made. If the test results differ by more than
plus or minus 0.5% from the comparison meter, the cause of the error shallmust
be determined and necessary corrections shallmust be made
before the system is reused. The comparison meter shallmust be
checked at an interval of 1 year not to exceed 13 months.
(f) Utilities shall maintain records of meters that have been tested during the preceding calendar year and shall make this information available to the commission upon request. The record must contain all of the following information for each meter tested:
(i) Set year.
(ii) Type of case.
(iii) Manufacturer.
(iv) Customer class, either commercial and industrial or residential.
(v) Results of the meter test.
(vi) Whether the meter was retired and if so the reasons for the retirement.
R 460.2351a Statistical quality sampling program for diaphragm-type meters.
Rule 51a. (1) A utility shall comply with the provisions of R 460.2351, except that a utility that receives approval from the commission may adopt the requirements of this rule for statistical sampling and quality control of in-service diaphragm meters. Statistical sampling and quality control must be supervised by an individual trained in statistical sampling techniques.
(2) A utility may use any of the following statistical quality control programs for meter testing, as adopted by reference in R 460.2344:
(a) ANSI B109.1-2019, “Diaphragm-Type Gas Displacement Meters, Under 500 Cubic Feet per Hour Capacity.”
(b) ANSI B109.2-2000 (R2008), “Diaphragm-Type Gas Displacement Meters, 500 Cubic Feet per Hour Capacity and Over.”
(c) ANSI/ASQ Z1.9-2003 (R2018), “Sampling Procedures and Tables for Inspection by Variables for Percent Nonconforming.”
(d) ANSI/ASQ Z1.4-2003 (R2018), “Sampling Procedures and Tables for Inspection by Attributes.”
(3) A utility may use an alternative statistical quality sampling program if approved by the commission. An application to use an alternative program must include all of the following information:
(a) A description of the sampling program that must include all of the following:
(i) The type or types of meters subject to the sampling plan.
(ii) The frequency of testing.
(iii) The procedures to be used for the sampling.
(iv) The meter test method to be used.
(v) The accuracy of the testing and of the sampling plan.
(b) An explanation of the reason or reasons for the requested sampling plan.
(c) An analysis that demonstrates that, with respect to assuring the accuracy of the meters tested, the requested sampling program is at least as effective as the standards listed in subrule (2) of this rule.
(4) Meters for quality control sampling must be separated into homogenous groups by year set and may be further separated by manufacturer, capacity rating, model, case type, diaphragm material, year manufactured, or other distinguishing characteristics. When 1 or more groups established are believed to be too small for practical quality control sampling, they may be combined with another group of similar operating characteristics to establish a larger sampling base. Combined groups must have sample size and acceptance-rejection numbers based on the combined total of meters. Samples must be drawn by a random method that ensures each meter in the group has an equal chance of being selected.
(5) All meter groups, or combined meter groups, must be subject to acceptance or rejection on the basis of the statistical results unless it becomes obvious that the rejected meters are predominantly from 1 identifiable subgroup which may be shown by test data to have been affected by location, age, or other common factors. If this result should occur, the identifiable subgroup may be separated and the remaining meters treated as a new combined group with appropriate sample size and acceptance-rejection numbers.
(6) A meter removed from a customer’s premises and tested as part of any business practice not related to the statistical quality control program must be included only in the program’s sample if the meter is randomly selected according to subrule (4) of this rule.
(7) Not later than March 1 of each year, utilities shall file a report of the meters that have been tested during the preceding calendar year. The report must include separate sections addressing results for meters tested as part of the statistical quality control program and meters tested as part of routine meter removals or exchanges. The report must detail both of the following:
(a) All of the following meter characteristics:
(i) Set year.
(ii) Type of case.
(iii) Manufacturer.
(iv) Type of diaphragm.
(v) Revenue classification, either commercial and industrial or residential.
(b) The number of meters in each meter class tested and found within the norm and within each 1% variance from norm between 94% accuracy and 106% accuracy. Meters that are slower than 94% and faster than 106% must each be grouped separately. Meters that are determined to be nonregistering must be reported to either have been repaired, tested, and returned to the field, or retired.
R 460.2352 Diaphragm-type meters; meter tests;
reports.Rescinded.
Rule 52. (1) A utility shall comply with the
provisions of R 460.2351, except that a utility that receives approval from the
commission may adopt the requirements of this rule.
(2) This rule applies only to diaphragm-type
meter categories that have a rated capacity as follows:
(a) Category 1 - 500 cubic feet per hour or
less.
(b) Category 2 - 501 cubic feet per hour to 1000
cubic feet per hour.
(c) Category 3 - 1001 cubic feet per hour or
more.
(3) As used in this rule:
(a) “Meter class” means a group or groups of
meters as assigned by the utility according to specified meter characteristics,
such as TMS (type, make, size), set year, year of manufacture, or other similar
characteristics.
(b) “Norm” means the acceptable meter accuracy
range between 98% and 102%.
(c) “Test point,” for a meter, means the
numerical equivalent of the accuracy variance from norm, with 1 test point
equal to a 1% variance. For example, a meter that is between 104.1% and 105.0%
or between 95.0% and 95.9% accurate on test would have 3 test points.
(4) The overall annual test rate criteria shall
be determined pursuant to all of the following provisions:
(a) Determine the average test points per meter
for each meter class (Pmc).
(b) Multiply the total number of installed
meters at year-end in each class by the respective Pmc to determine the total
test points for each meter class. The test points for each meter class shall
be added to arrive at total overall test points (Pt) for all installed meters
specified in subrule (2) of this rule.
(c) Divide Pt by the total number of installed
meters at year-end to determine the overall average test points per meter.
(d) Using the overall average test points per
meter determined in subdivision (c) of this subrule, determine the required
percentage of total overall test points to be corrected the following year
based upon the following table:
Percentage of total
Overall average test overall test points points
per meter (Pt) to be corrected
.060 or less 2
.061 - .09 3
.091 - .12 4
.121 - .15 5
.151 - .18 6
.181 - .21 7
.211 - .24 8
.241 - .27 9
.271 - .30 10
.301 - .33 11
.331 - .35 12
.351 or more 15
(e) Multiply Pt by the applicable percentage of
the points to be corrected as specified in subdivision (d) of this subrule to
determine the total minimum test points to be corrected for the following year.
(f) The sum of Pmc times the number of meters
tested for each meter class for the following year shall meet or exceed the
total minimum test points to be corrected as determined in subdivision (e) of
this subrule. The mix of meters to be tested shall be at the utility’s
discretion, if the requirements of subrules (5) and (6) of this rule are met.
(g) With commission approval, a utility may
modify the requirements set forth in subdivisions (b) to (f) of this subrule so
as to make the required computations based not on the utility’s test data from
the prior year, but on the utility's test data from a calendar year 1 year
earlier.
(5) Except for the nonregistering meters, all
meters that are removed from customers’ premises shall be tested and shall form
the basis of determining the total minimum test points to be corrected for the
following calendar year in accordance with the provisions of subrule (4) of
this rule. If a utility has knowledge that a particular class of meters is not
maintaining satisfactory accuracy and cannot be repaired to maintain
satisfactory accuracy, the class of meters shall be removed from service and
retired.
(6) Not less than 2% of the total meters that
are originally set in each set year and not less than 2% of the total meters in
service in each meter class shall be tested annually, except that a meter need
not be removed for testing within the first 4 years after it is set.
(7) Not later than March 1 of each year,
utilities shall file a report of the meters that have been tested during the
preceding calendar year. The report shall detail all of the following
information:
(a) All of the following meter characteristics:
(i) Set year.
(ii) Type of case.
(iii) Manufacturer.
(iv) Type of diaphragm.
(v) Revenue classification, either commercial
and industrial or residential.
(b) The number of meters in each meter class
tested and found within the norm and within each 1% variance from norm between
94% accuracy and 106% accuracy. Meters that are slower than 94% and faster
than 106% shall each be grouped separately. For a utility that has more than
500,000 customers, the commission may approve a further 1% variance for meters
that are slower than 94% and faster than 106%.
(c) A comparison of the total test meters that
were tested in the preceding year with the standard required pursuant to the
provisions of subrule (4) of this rule.
(d) Information and data that are needed to
compute the total minimum test points to be corrected for the subsequent year
in accordance with the provisions of subrule (4)(a) to (e) of this rule.
(e) The identity of the meter classes to be used
for the subsequent year, including an explanation for any meter class changes.
(f) A separate section on meters that were
retired during the preceding year that details the information identified in
subdivision (a) of this subrule and the reasons for the retirement of the
meters.
R 460.2353 Retirement of meters.
Rule 53. (1) Meters shallmust be
retired from service whenever abnormal conditions affecting accuracy cannot be
corrected for economic or other reasons. Examples of such conditions are basic
defects due to manufacture, design, or excessive damage. Meters may also be retired
due to obsolescence, unavailability of repair parts, or other reasons.
(2) Notwithstanding the provisions of any other rule, meters that are found to be overregistering must be repaired or replaced within 6 months of the discovery of the error unless a different period is approved by the commission.
R 460.2354 Accuracy of metering equipment; tests; standards.
Rule 54. (1) The A utility shall use
the applicable provisions of the standards listedadopted by reference
in R 460.234244 as criteria of accepted practice in testing
meters.
(2) Metering equipment shallmust be
tested by comparison with the standards that are adopted by referenced
in R 460.234244.
(3) A gas service meter that is repaired or removed
from service for any cause shallmust, before installation, be
tested and adjusted to be correct within 1% fast or 1% slow.
(4) Every diaphragm-type gas meter shallmust
be tested before installation and adjusted, if required, to a meter
accuracy of 100% plus or minus 1% at a low flow rate and at a high flow rate so
that the numerical difference between the meter accuracy at these 2 flow rates
is not more than 1 percentage point. A low flow rate is a flow at 20% to 50%
of the rated capacity of the meter. A high flow rate is a flow at 80% to 120%
of the rated capacity of the meter. The average meter accuracy of a
diaphragm-type meter shallmust be defined as 1/2 the sum of the
meter accuracy at the low flow test and at the high flow test.
(5) All recording-type meters or associated
instruments that have a timing element that serves to record the time at which
the measurement occurs for billing purposes shallmust be adjusted
at intervals of not more than 2 years so that the timing element is not in
error by more than plus or minus 4 minutes in 24 hours, under laboratory
conditions, as set forth in ANSI B109.1-2019, “Diaphragm Type – Gas
Displacement Meters, Under 500 Cubic Feet per Hour Capacity”, which is
adopted by reference in R 460.2342(b)(ii)44, or by more than plus
or minus 10 minutes in 24 hours under field conditions.
R 460.2355 Meter shop; design; meter testing system; standards; handling; calibration cards; calibrated orifices.
Rule 55. (1) A utility shall maintain or designate
a meter shop within Michigan for the purpose of inspecting, testing, and
repairing meters. The shop shallmust be open for inspection by
authorized representatives of the commission at all reasonable times. A utility
may secure authorityobtain approval from the commission to have
its meters tested outside of Michigan upon showing, to the satisfaction of the
commission, that the meter test facilities so utilized are in compliance with
these rules. Records of test results shallmust be maintained in
Michigan or the administrative headquarters of the utility.
(2) The area within the meter shop that is used for
the testing of meters shallmust be designed so that the meters
and meter-testing equipment are protected from drafts and excessive changes in
temperature. The meters to be tested shallmust be stored in such
a manner that the temperature of the meters is substantially the same as the
temperature of the prover.
(3) A utility shall own and maintain, or have access to, a meter-testing system (working standard) of an approved type, subject to all of the following provisions:
(a) Means shallmust be provided to
maintain the temperature of the liquid in a meter-testing system at substantially
the same level as the ambient temperature in the prover area.
(b) The meter-testing system shallmust be
maintained in good condition and in correct adjustment so that it shall be
is capable of determining the accuracy of any service meter to plus or minus
0.5%.
(c) A utility may use a properly calibrated test meter or transfer prover or may use a properly designed flow prover for testing meters.
(4) Meter-testing systems (working standards) shallmust
be checked by comparison with a secondary standard. Both of the following
provisions shallmust be complied with:
(a) At least once every 5 years, bell and flow
provers shallmust be checked with a 1-cubic foot bottle or shallmust
be calibrated by dimensional measurement or any other test that is approved
by the commission. The accuracy of the secondary standard that is used shallmust
be traceable to the nNational iInstitute of sStandards
and tTechnology.
(b) At least once every 10 years, rotary
displacement transfer provers shallmust be checked with a
standard that has its calibration traceable to the nNational iInstitute
of sStandards and tTechnology or shallmust
be checked by any other suitable test that is approved by the commission.
(5) Extreme care shallmust be
exercised in the use and handling of standards to assure ensure that
their accuracy is maintained.
(6) Each standard shallmust have a
certificate or calibration card which shallmust be duly signed
and dated and which shallmust record the corrections that were
required to compensate for errors found on the last test.
(7) A utility shall have properly calibrated orifices to achieve the rates of flow required to test the meters on its system.
PART 6. BILL ADJUSTMENT; METER ACCURACY
R 460.2361 Bill adjustment; meter accuracyRescinded.
Rule 61. If a meter is found to be
nonregistering or to have an average meter accuracy less than 98% or greater
than 102%, an adjustment of bills for the inaccuracy may be made in the case of
nonregistration or underregistration and shall be made in the case of
overregistration. The adjustment shall be calculated on the basis that the
meter is 100% accurate with respect to the testing equipment that is used to
make the test.
R 460.2362 Determination of adjustment.
Rule 62. (1) If the date that the period of
inaccurate meter registration began can be determined, that date shallmust
be the starting point for calculating an adjustment pursuant to the
provisions of R 460.2361115.
(2) If the date that the period of inaccurate meter
registration began cannot be determined, it shallmust be assumed
that the inaccuracy existed for a period equal to 1/2 of the time elapsed since
the meter was last installed on the present premisesor tested.
(3) The adjustment shallmust be made
on the basis of actual monthly consumption, if possible. Otherwise, the
average monthly consumption that is determined from the most recent 36 months’
consumption data shallmust be used.
R 460.2363 Refunds.
Rule 63. (1) Refunds shall be made to the 2
most recent customers who received service through the meter found to be
registering inaccurately. If the utility has not adopted the requirements
of R 460.2352, the period that is used for determining the amount to be
refunded shall not be more than 12 months. If the utility has adopted the
requirements of R 460.2352, the period that is used for determining the amount
to be refunded shall be the period of inaccurate meter registration that is
determined pursuant to the provisions of R 460.2362(1) to (2). In the case
of a previous customer who is no longer a customer of the utility, a notice of
the amount of the refund shall be mailed to his or her last known address and
the utility shall, upon demand made within 3 months, refund the amount.
(2) If the amount of the refund due an existing
or previous customer as the result of meter overregistration is equal to, or
more than, an average of 10 cents per month for the period that is used for
determining the amount to be refunded, the full amount of the refund shall be
made, except that a refund that is less than $1.00 need not be made to an
existing customer and a refund that is less than $2.00 need not be made to a
previous customer who is no longer a customer of the utility.
R 460.2364 RebillingRescinded.
Rule 64. If the amount due the utility as the
result of meter nonregistration or underregistration is equal to, or more than,
amounts set forth in R 460.2363(2) as minimum refunds, the utility may bill the
customer for the amount due, but the period covered by the billing shall not be
more than 12 months unless otherwise ordered by the commission. The utility
shall offer the customer reasonable payment arrangements for the amount of the
billing, taking into account the period covered by the billing. A rebilling
policy that is adopted by a utility based on minimum amounts that are more than
those set forth in R 460.2363(2) shall be uniformly applied to all customers.
PART 7. SHUTOFF OF SERVICE
R 460.2371 Conditions for establishing gas service; liability; notice and record of inability to establish service; refusal of service to customer using other gaseous fuel; exception; service quality.
Rule 71. (1) A utility shall not establish
gas service to a customer’s premises until the utility has done both of the
following:in compliance with the Michigan gas safety standards.
(a) Performed a leakage test using gas at
utilization pressure to ensure that the customer’s fuel line is gastight.
(b) Made a determination that the gas odor is detectable.
(2) This test shall not be construed to make theThe
utility shall not be liable for the installation, maintenance, or
use of piping or appliancesgas utilization equipment that areis
owned by the customer, nor shall the utility be held liable for any
continuing duty of inspection of piping or appliancesequipment.
(3) If the condition of the customer’s fuel line is such that service cannot be established, the utility shall notify the customer, in writing, of the reason or reasons that service was not established.
(4) A record shallmust be kept by the
utility of all cases where refusal to establish service is made. The record shallmust
provide all of the following information:
(a) The name of the customer.
(b) The address or location of the premises.
(c) The date of the test.
(d) The name of the service person.
(e) All changes or rearrangements recommended.
(5) Except in certain commercial and industrial applications that require a standby fuel that is authorized by the utility, the utility shall have the authority to refuse gas service to a customer that uses another gaseous fuel, such as liquefied petroleum gas, in the same building.
(6) A utility shall have a meter reading factor of 85% or more for meters requiring billing reads within the meter reading period pursuant to the approved tariff, including customer reads.
R 460.2373 Shutoff of service.
Rule 73. Under any of the following conditions, gas service may be shut off by the utility:
(a) A hazardous condition exists. In this instance, gas service may be shut off without prior notification.
(b) A potentially hazardous condition exists. In
this instance, gas service may be shut off upon implementing the
customer notification procedures set forth in R 460.2071 et seq. and R 460.2101
et seq. of the Michigan Administrative Code and in the utility’s rate bookafter
providing the customer with written notice of shutoff by first class mail at
least 10 days before the shutoff is scheduled to occur.
(c) Refusal of required access. In this instance,
gas service may be shut off upon implementing the customer notification
procedures set forth in R 460.2071 et seq. and R 460.2101 et seq. of the
Michigan Administrative Code and in the utility’s rate bookafter
providing the customer with written notice of the shutoff by first class mail
at least 10 days before the shutoff is scheduled to occur.
R 460.2374 Customer notification of shutoff of
serviceRescinded.
Rule 74. A utility shall include, in its rate
book, notification procedures to be utilized in dealing with potentially
hazardous conditions and refusal of required access conditions.
PART 8. GAS QUALITY
R 460.2381 Gas purity.
Rule 81. (1) Gas that is distributed by a utility
to a customer shallmust not contain more than 0.3 grains of
hydrogen sulfide or more than 20 grains of total sulfur per 100 cubic feet,
including the sulfur in any hydrogen sulfide.
(2) Gas that is distributed by a utility to a
customer shallmust not contain flammable liquids in quantities
that interfere with the normal operation of the customer’s equipment.
(3) Gas that is distributed by a utility to a customer must not contain more than 2% carbon dioxide or 5 parts per million oxygen.
(4) Gas that is distributed by a utility to a customer must not contain water in excess of 7 pounds per million cubic feet.
R 460.2382 Heating value; authorized variations.
Rule 82. (1) The heating value of substitute
natural gas and mixed gas shallmust be considered as being under
the control of the utility. The average heating value on 1 day shallmust
not be more than or less than the standard total heating value range set
forth in the utility’s rules. A utility shall not add air to a gas stream if
this results in a heating value that is below 1,000 British thermal units per
standard cubic foot.
(2) The average monthly heating value of gas that
is supplied by a utility shall be 1,025 British thermal units per standard
cubic foot, plus or minus 75 British thermal units. A greater variation may be
authorizedapproved by the commission upon a showing by the
utility that the variation will not adversely affect the efficient and
satisfactory operation of its customers’ appliancesgas utilization
equipment.
R 460.2383 Heating value records; location and accuracy of measuring equipment; frequency of heating value determination.
Rule 83. (1) A utility shall maintain records of
the heating value of the gas it distributes. Heating value test records
shallmust be preserved for not less thana minimum of
6 years. A utility shall utilize either the industry standards that are
adopted by reference in R 460.23424(d) or other standards that
are approved by the commission for heating value determination methods.
(2) Heating value measuring equipment shallmust
be installed in suitably located testing stations.
(3) The accuracy of all heating value measuring
equipment and the method of making heating value tests shallmust meet
the industry standards that are adopted by reference in R 460.23424(d)
or shallmust otherwise be approved by the commission. Recording
equipment shallmust be tested not less than, at a
minimum, annually.
(4) The utility shall determine the heating value
of substitute natural gas and mixed gas not less thanat a minimum of
twice a day and shall make the tests during the periods of the a.m. and p.m.
peak demands.
(5) The utility shall determine the heating value of gas at least once a month. A utility that sells gas subject to a thermal adjustment shall determine the heating value at least once a day.