PSC 135.125 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99. PSC 135.163PSC 135.163 Compressor stations: design and construction additions [49 CFR 192.163]. (bw) All compressor station buildings shall be constructed of non-combustible materials.
(cw) Exits shall be provided in compliance with the requirements of the Wisconsin Commercial Building Code, chs. SPS 361 to 366. Ladders shall not be used for exits. (ew) All electrical equipment and wiring installed in gas transmission and distribution compressor stations shall conform to the requirements of the state electrical code, chs. SPS 316 and PSC 114. PSC 135.163 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99; correction in (2) made under s. 13.93 (2m) (b) 7., Stats., Register February 2004, No. 578; correction in (2) made under s. 13.93 (2m) (b) 7., Stats., Register April 2007 No. 616; correction in (2) and (3) made under s. 13.92 (4) (b) 7., Stats., Register December 2012 No. 684; CR 21-049: am. (1) Register March 2022 No. 795, eff. 4-1-22. (aw) Fire protection. Fire-protection facilities shall be provided as specifically directed by the department of safety and professional services and the local fire department. The operation of fire-protection facilities, such as pumps, shall not be affected by an emergency shutdown.
PSC 135.171 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99; correction made under s. 13.92 (4) (b) 6., Stats., Register December 2018 No. 756. (1w) There shall be compliance with the state heating, ventilation, and air conditioning code, ch. SPS 364. PSC 135.173 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99; correction made under s. 13.92 (4) (b) 7., Stats., Register December 2012 No. 684. (bw) The distance between the valve and the regulator or regulators shall be sufficient to permit the operation of the valve during an emergency such as a large gas leak or a fire in the station. These valves shall be in accessible locations neither closer than 25 feet nor more than 1,500 feet distant from each regulator station.
PSC 135.181 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99. (dw) In the design of vaults and pits for pressure limiting, pressure relieving and pressure regulating equipment, the installed equipment shall be protected from damage, such as that resulting from an explosion within the vault or pit, which may cause portions of the roof or cover to fall into the vault.
(ew) Vault or pit openings shall be located so as to minimize the hazards of tools or other objects falling upon the regulator, piping, or other equipment. The control piping and the operating parts of the equipment installed shall not be located under a vault or pit opening where workers can step on them when entering or leaving the vault or pit, unless such parts are suitably protected. Whenever a vault or pit opening is to be located above equipment which could be damaged by a falling cover, a circular cover should be installed or other suitable precautions taken.
PSC 135.183 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99. (4w) The outside end of the ducts shall be equipped with a suitable weatherproof fitting or vent-head designed to prevent foreign matter from entering or obstructing the duct. The effective area of the openings in such fittings or vent-heads shall be at least equal to the cross-sectional area of a 4-inch duct. The horizontal section of the ducts shall be as short as practical and shall be pitched to prevent the accumulation of liquids in the line. The number of bends and offsets shall be reduced to a minimum and provisions shall be incorporated to facilitate the periodic cleaning of the ducts.
PSC 135.187 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99. PSC 135.189PSC 135.189 Vaults: drainage and waterproofing additions [49 CFR 192.189]. (aw) Nevertheless, vault equipment shall always be designed to operate safely, if submerged.
(cw) Electrical equipment in vaults shall conform to the applicable requirements of the state electrical code, chs. SPS 316 and PSC 114. PSC 135.189 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99; correction in (2) made under s. 13.92 (4) (b) 7., Stats., Register December 2012 No. 684. (3w) Suitable types of protective devices to prevent overpressuring of high-pressure distribution systems include:
(i) Spring-loaded relief valves of types meeting the provisions of the ASME Unfired Pressure Vessel Code.
(ii) Pilot-loaded back-pressure regulators used as relief valves, so designed that failure of the pilot system or control lines will cause the regulator to open.
(iii) Spring loaded diaphragm-type relief valves.
(iv) A monitoring regulator installed in series with the primary pressure regulator.
(v) A series regulator installed upstream from the primary regulator, and set to continuously limit the pressure on the inlet of the primary regulator in accordance with the provisions of 49 CFR 192.201. (vi) An automatic shut-off device installed in series with the primary pressure regulator, and set to shut off in accordance with the provisions of 49 CFR 192.201. This device shall remain closed until manually reset. It may not be used where it might cause an interruption in service to a large number of customers. (4w) Suitable types of protective devices to prevent overpressuring of low-pressure distribution systems include:
(i) A liquid seal relief device that can be set to open accurately and consistently at the desired pressure.
(ii) A series regulator, as described in s. PSC 135.195 (3w) (v).
(iii) An automatic shut-off device, as described in s. PSC 135.195 (3w) (vi).
(iv) A pilot loaded back-pressure regulator, as described in s. PSC 135.195 (3w) (ii).
(v) A monitoring regulator, as described in s. PSC 135.195 (3w) (iv).
(cw) Suitable types of protective devices to prevent overpressuring of gas pressure holders, pipelines and other facilities that might at times be bottle tight include:
(1) Spring-loaded relief valves of types meeting the provisions of the ASME Unfired Pressure Vessel Code.
(2) Pilot-loaded back-pressure regulators used as relief valves, so designed that failure of the pilot system or control lines will cause the regulator to open.
PSC 135.195 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99; corrections made under s. 13.93 (2m) (b) 7., Stats., Register February 2004, No. 578; correction made under s. 13.92 (4) (b) 7., Stats., Register February 2011 No. 662. PSC 135.197PSC 135.197 Control of the pressure of gas delivered from high-pressure distribution systems additions [49 CFR 192.197]. After 49 CFR 192.197(c), insert: (dw) The service regulator shall be of a type that is capable under normal operating conditions of regulating the downstream pressure within the limits of s. PSC 134.23 and of limiting the build-up of pressure under no-flow conditions to 50% or less of the discharge pressure maintained under flow conditions. (ew) In addition to the provisions of 49 CFR 192.197(a) and (b), if the maximum actual operating pressure of the distribution system is greater than low pressure and is equal to or less than 60 p.s.i.g., a suitable protective device shall be installed to prevent unsafe overpressuring of the customer’s appliances should the service regulator fail. These devices may be installed as an integral part of the service regulator or as a separate unit. Some of the suitable types of protective devices to prevent overpressuring of customers’ appliances are: (1) A monitoring regulator.
(2) A relief valve.
(3) An automatic shut-off device.
(fw) Breather vents shall be provided on all service regulators.
PSC 135.197 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99. PSC 135.199PSC 135.199 Requirements for design of pressure relief and limiting devices additions [49 CFR 192.199]. (ew) In addition, the outlet ports shall be insect-proof and consideration shall be given to all exposures in the immediate vicinity including windows or locations where gas can enter confined areas;
(1) Lock the stop valve in the open position. Instruct authorized personnel of the importance of not inadvertently leaving the stop valve closed and of being present during the entire period that the stop valve is closed so that they can lock it in the open position before they leave the location.
(2) Install duplicate relief valves, each having adequate capacity by itself to protect the system and arrange the isolating valves or 3-way valve so that mechanically it is possible to render only one safety device inoperative at a time.
(iw) Precautions shall be taken to prevent unauthorized operation of any valve which will make pressure limiting devices inoperative. This provision applies to isolating valves, by-pass valves, and valves on control or float lines which are located between the pressure limiting device and the system which the device protects. A method similar to s. PSC 135.199 (2) (hw), shall be considered acceptable in complying with this provision.
PSC 135.199 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99; correction in (2) made under s. 13.93 (2m) (b) 7., Stats., Register February 2004, No. 578. 192.206w Pipelines on private right-of-way of electric transmission lines. Where gas pipelines parallel overhead electric transmission lines on the same right-of-way, the company operating the pipelines shall:
(a) Employ blow-down connections and relief valve vents that will direct the gas away from the electric conductors.
(b) Make a study in collaboration with the electric company on the common problems of corrosion and electrolysis, taking the following factors into consideration:
(1) The possibility of the pipeline carrying either unbalanced line currents or fault currents.
(2) The possibility of lightning or fault currents inducing voltages sufficient to puncture pipe coatings or pipe.
(3) Cathodic protection of the pipeline, including location of ground beds, especially if the electric line is carried on steel towers.
(4) Bonding connections between the pipeline and either the steel tower footings or the buried ground facilities or the ground-wire of the overhead electric system.
(c) Investigate the necessity of protecting insulating joints in the pipeline against induced voltages or currents resulting from lightning strikes. The protection can be obtained by connecting buried sacrificial anodes to the pipe near the insulating joints or by bridging the pipeline insulator with a spark-gap or by other effective means.
PSC 135.206 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99; CR 21-049: PSC 135.206 renum. from PSC 135.204 and am. Register March 2022 No. 795 No. 795, eff. 4-1-22. PSC 192.246w Precautions to Avoid Explosions of Gas-Air Mixtures or Uncontrolled Fires During Construction Operations. (a) Operations such as gas or electric welding and cutting with cutting torches can be safely performed on pipelines and mains and auxiliary equipment, provided that they are completely full of gas, or air that is free from combustible material. Steps shall be taken to prevent a mixture of gas and air at all points where such operations are to be performed.
(b) When a pipeline or main can be kept full of gas during a welding or cutting operation, the following procedures are recommended:
(1) Keep a slight flow of gas moving toward the point where cutting or welding is being done.
(2) The gas pressure at the site of the work shall be controlled by suitable means.
(3) Close all slots or open ends immediately after they are cut with tape, or with tape and tightly fitting canvas or other suitable material.
(4) Two openings may not remain uncovered at the same time.
(c) No welding or acetylene cutting shall be done on a pipeline, main, or auxiliary apparatus that contains air if it is connected to a source of gas, unless a suitable means has been provided to prevent the leakage of gas into the pipeline or mains.
(d) In situations where welding or cutting must be done on facilities which are filled with air and connected to a source of gas and the precautions in par. (b) cannot be taken, one or more of the following precautions, depending upon the circumstances at the job are required:
(1) Purging of the pipe or equipment upon which welding or cutting is to be done, with combustible gas or inert gas.
(2) Testing of the atmosphere in the vicinity of the zone to be heated before the work is started and at intervals as the work progresses, with a combustible gas indicator or by other suitable means.
(3) Careful verification before the work starts that the valves that isolate the work from a source of gas do not leak.
PSC 135.246 HistoryHistory: Cr. Register, October, 1999, No. 526, eff. 11-1-99.
