(3) Changes in direction that cannot be made in accordance with 192.321 (kw) (1) shall be made with elbow-type fittings.
(4) Miter bends are not permitted.
(Lw) Plastic piping shall be laid on undisturbed or well compacted soil. If plastic piping is to be laid in soils which may damage it, the piping shall be protected by suitable rock free materials before back-filling is completed. Plastic piping shall not be supported by blocking. Well tamped earth or other continuous support shall be used.
PSC 135.321 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99;
CR 21-049; renum. 135.321 to (1), (2) and am. Register March 2022 No. 795, eff. 4-1-22.
(ew) Casing requirements of highway authorities shall be followed; however, construction type shall not be any less than provided by
49 CFR 192.323.
PSC 135.323 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
PSC 192.324w Rail Crossings. Whenever a steel pipeline is installed under a railroad track and a casing is not used, the operator shall install the pipeline using the methods prescribed in Gas Research Institute report number GRI-91/0285, entitled “Guidelines for Pipelines Crossing Railroads and Highways."
PSC 135.324 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
(bw) No distribution main or transmission line shall be installed under buildings.
PSC 135.325 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
PSC 135.355
PSC 135.355 Customer meters and regulators: protection from damage additions [49 CFR 192.355].
(aw) Install a check valve or equivalent if any of the following apply:
(1) The utilization equipment might induce a back-pressure.
(2) The gas utilization equipment is connected to a source of oxygen or compressed air.
(3) Liquefied petroleum gas or other supplementary gas is used as standby and might flow back into the meter. A three-way valve installed to admit the standby supply and at the same time shut off the regular supply, can be substituted for a check valve if desired.
(4w) At locations where service regulators might be submerged during floods, either a special anti-flood type breather vent fitting shall be installed, or the vent line shall be extended above the height of the expected flood waters.
PSC 135.355 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
(bw) Whenever gas is supplied to a theater, church, school, factory or other building where large numbers of persons assemble, an outside valve in such case will be required.
PSC 135.365 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
(aw) When coated steel pipe is to be installed as a service line in a bore, care should be exercised to prevent damage to the coating during installation. For all installations to be made by boring, driving or similar methods or in a rocky type soil, the following practices or their equivalents shall be followed:
(1) When a service line is to installed by boring or driving and a coated steel pipe is to be used for the service line, the coated pipe may not be used as the bore pipe or drive pipe and left in the ground as part of the service line. Such installations shall be made by first making an oversize bore, removing the pipe used for boring and then inserting the coated pipe.
(2) Coated steel pipe may not be inserted through a bore in exceptionally rocky soil where there is a likelihood of damage to the coating resulting from the insertion.
PSC 135.371 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
(cw) Plastic service lines that are not encased shall either be installed with an electrically conductive wire having adequate corrosion resistant characteristics or protection or some other acceptable means of readily locating the buried service pipe from the ground surface shall be provided.
PSC 135.375 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
(aw) Copper service lines installed within a building may not be concealed.
(bw) Ferrous valves and fittings installed on underground copper service lines shall be protected from contact with the soil or insulated from the copper pipe.
PSC 135.377 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
PSC 135.457
PSC 135.457 External corrosion control: buried or submerged pipelines installed before August 1, 1971 addition [49 CFR 192.457]. After
49 CFR 192.457 (b), insert:
(cw) Notwithstanding the provisions of
49 CFR 192.457(b) regarding active corrosion, effectively coated steel distribution pipelines, except for those portions including services and short sections that because of their nature and installation make cathodic protection impractical and uneconomical, shall be cathodically protected along the entire area that is effectively coated in accordance with this subpart.
PSC 135.457 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99;
CR 21-049: am. Register March 2022 No. 795, eff. 4-1-22.
PSC 135.505
PSC 135.505 Strength test requirements for steel pipeline to operate at a hoop stress of 30 percent or more of SMYS addition [49 CFR 192.505]. After
49 CFR 192.505 (d), insert:
(ew) Except in freezing weather or when water is not available, pipelines or mains larger than 6 inches in diameter, installed in class locations 1, 2, or 3, shall be hydrostatically tested in place to at least 90% of the specified minimum yield strength.
PSC 135.505 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99;
CR 21-049: am. Register March 2022 No. 795, eff. 4-1-22.
(dw) Each segment of a service line, other than plastic, intended to be operated at a pressure between 0 and 1 p.s.i.g. shall be given a leak test at a pressure of not less than 50 p.s.i.g.
PSC 135.511 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
(cw) When street is paved or repaved. Whenever a road or street is paved or repaved with permanent pavement, the operator shall do all of the following:
(1) Check for leaks along all mains and services in the streets and abutting property with a continuous-sampling instrument capable of detecting combustible gas in air concentrations of 100 parts per million.
(2) Determine condition of pipe and joints by sample visual examination, where possible.
(3) Repair any leaks found.
(4) Replace pipe if existing pipe is corroded to such an extent that it is likely to require replacement before the street is again resurfaced.
(dw) Underground pipes. Whenever underground pipes are exposed in order to repair leaks, the utility shall record on the repair order the nature of the leak and possible cause from observation.
PSC 135.613 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
(fw) All operators of natural gas pipelines shall be a member of a single, state-wide one-call system. If there is more than one state-wide one-call system, the public service commission may determine which system the operators will join.
PSC 135.614 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99;
CR 21-049: am. Register March 2022 No. 795, eff. 4-1-22. PSC 135.621
PSC 135.621 Maximum allowable operating pressure: high-pressure distribution systems additions [49 CFR 192.621].
(3w) No person may operate a segment of a cast iron pipe.
(cw) Sixty p.s.i.g. in individual distribution systems or portions of a system. The intercity or supply mains for these distribution systems may be operated at pressures higher than 60 p.s.i.g. if the number of services supplied from these mains are limited and these mains are not an integral part of the distribution system. The pressure and the services supplied from these higher pressure intercity and supply mains shall be limited to 60 p.s.i.g. unless the service lines are equipped with series regulators or other pressure limiting devices as prescribed in
49 CFR 192.197(c).
PSC 135.621 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99;
CR 21-049: am. (1) Register March 2022 No. 795, eff. 4-1-22. PSC 135.623
PSC 135.623 Maximum allowable operating pressure: low-pressure distribution systems addition [49 CFR 192.623]. After
49 CFR 192.623(b), insert:
(cw) No person may operate a low pressure distribution system at a pressure in excess of that provided by s.
PSC 134.23 (1).
PSC 135.623 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
(cw) No pipeline, main, or service shall be purged into any building or confined space.
PSC 135.629 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
PSC 135.707
PSC 135.707 Line markers for mains and transmission lines addition [49 CFR 192.707]. After
49 CFR 192.707(d), insert:
(ew) When transmission lines are located outside urban areas, their location shall be marked, recognizable to the public, at each fence line, road crossing, railroad crossing, river, lake, stream, or drainage ditch crossing and wherever it is considered necessary to identify the location of a pipeline to reduce the possibility of damage or interference.
PSC 135.707 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
PSC 135.713
PSC 135.713 Transmission lines: permanent field repair of imperfections and damages addition [49 CFR 192.713]. After
49 CFR 192.713 (a) (2), insert:
(3w) Gouges and grooves of lesser depth than 10% of the nominal wall thickness of the pipe may be removed by grinding out to a smooth contour provided the grinding does not reduce the remaining wall thickness to less than the minimum prescribed by
49 CFR 192 for the conditions of use.
PSC 135.713 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99;
CR 21-049: am. Register March 2022 No. 795, eff. 4-1-22.
192.714w Repair of Steel Pipe Operating below 40 Percent of the Specified Minimum Yield Strength. If inspections at any time reveal an injurious defect, gouge, groove, dent, or leak, immediate temporary measures shall be employed to protect the property and public if it is not feasible to make permanent repair at time of discovery. As soon as feasible, permanent repairs shall be made using recognized methods of repair.
PSC 135.714 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99
CR 21-049: PSC 135.714 renum. from PSC 135.720 and am. Register March 2022 No. 795, eff. 4-1-22.
192.722w Distribution Mains: Markers. When distribution mains are located outside urban areas, their location shall be marked, recognizable to the public, at each fence line, road crossing, railroad crossing, river, lake, stream, or drainage ditch crossing and wherever it is considered necessary to identify the location of a pipeline to reduce the possibility of damage or interference.
PSC 135.722 History
History: Cr.
Register, October, 1999, No. 526, eff. 11-1-99.
(cw) Every operator shall maintain a gas leak-detection program and shall maintain records of operation under the program. The program shall consist of not less than the following:
(1) In addition to
49 CFR 192.723 (b) (1), a second leakage survey with a leak detection device shall be conducted over street openings in business districts, as shown by maps filed with the public service commission by each utility, each calendar year but not within 4
½ months of the survey required under
49 CFR 192.723 (b) (1).
(2) In each business district, a building survey shall be conducted at intervals not exceeding 15 months, but at least once each calendar year. The piping from the service entrance to the meter outlet and metering and regulating equipment shall be tested for gas leakage in those buildings that have gas service.
(3) A survey of all buildings used for public gatherings, such as schools, churches, hospitals, and theaters, shall be conducted at intervals not exceeding 15 months, but at least once each calendar year. The piping from the service entrance to the meter outlet and metering and regulating equipment shall be tested for gas leakage.
(4) In incorporated cities and villages, in addition to a survey of public buildings, the operator shall conduct a leak survey of all mains using a continuous-sampling instrument capable of detecting and measuring combustible gas in air concentrations of 100 parts per million. The utility may substitute for the test required by this provision a survey by mobile flame ionization or infrared gas detection units. The tests required by this provision shall be made at intervals not exceeding 15 months, but at least once each calendar year.
(5) Along all mains in unincorporated areas, a leakage survey with leak detection equipment shall be conducted at least once every 2 calendar years at intervals not exceeding 27 months.
(6) A leakage survey of all services conducted with an acceptable leak detection device shall be made at least once every 5 calendar years at intervals not exceeding 63 months.
