Oregon Administrative Rules
Chapter 437 - DEPARTMENT OF CONSUMER AND BUSINESS SERVICES, OREGON OCCUPATIONAL SAFETY AND HEALTH DIVISION
Division 4 - AGRICULTURE
Section 437-004-0780 - Storage and Handling of Liquefied Petroleum Gases

(A) Paragraph OAR 437-004-0780(3) applies to installations made according to OAR 437-004-0780(4), (5), (6) and (8), except as noted in each of those paragraphs.

(B) Paragraphs OAR 437-004-0780(4) through (8) have their own application statements.

(A) LP-Gas refrigerated storage systems;

(B) LP-Gas used with oxygen. The requirements of OAR 437-004-2310 apply to that use;

(C) Low-pressure (not more than one-half pound per square inch or 14 inches water column) LP-Gas piping systems, and the installation and operation of residential and commercial appliances including their inlet connections, supplied through such systems. For those systems, the National Fire Protection Association Standard for the Installation of Gas Appliances and Gas Piping, NFPA 54-1996 apply.

(A) Each system using DOT containers according to 49 CFR Part 178 must use approved container valves, connectors, manifold valve assemblies, and regulators.

(B) Each system for domestic or commercial use with containers of 2,000 gallons or less water capacity, other than those built according to 49 CFR Part 178, must have a container assembly and one or more regulators, and may include other parts. The system as a unit or the container assembly as a unit, and the regulator or regulators, must be individually listed.

(C) In systems using containers of more then 2,000 gallons water capacity, each regulator, container valve, excess flow valve, gaging device, and relief valve installed on or at the container, must be listed by a nationally recognized testing laboratory. Refer to 29 CFR 1910.7 for the definition of nationally recognized testing laboratory.

(A) Containers used with systems in OAR 437-004-0780(5), (6) and (8), except in (6)(c)(C), must comply with the Rules for Construction of Unfired Pressure Vessels, section VIII, Division 1, American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, 1968 edition.

(B) Containers constructed according to the 1949 and earlier editions of the ASME Code do not have to comply with paragraphs U-2 through U-10 and U-19 of it. Do not use containers constructed according to paragraph U-70 in the 1949 and earlier editions.

(C) Containers designed, constructed, and tested before July 1, 1961, according to the Code for Unfired Pressure Vessels for Petroleum Liquids and Gases, 1951 edition with 1954 Addenda, of the American Petroleum Institute and the American Society of Mechanical Engineers are acceptable. Containers constructed according to API-ASME Code do not have to comply with section I or with appendix to section I. Paragraphs W-601 to W-606 inclusive in the 1943 and earlier editions do not apply.

(D) Paragraph (3)(b)(A) above does not prohibit the use or reinstallation of containers constructed and maintained according to the standard for the Storage and Handling of Liquefied Petroleum Gases NFPA No. 58 in effect at the time of fabrication.

(E) Containers used with systems covered in OAR 437-004-0780(3), (5)(c)(C), and (7), must comply with DOT specifications effective at the date of their manufacture.

(A) Welding to the shell, head, or any other part of the container subject to internal pressure, must comply with the code under which the tank was built. Other welding is permitted only on saddle plates, lugs, or brackets attached to the container by the tank manufacturer.

(B) Welding of DOT containers, must be done by a qualified manufacturer making containers of the same type, and must comply with DOT regulations.

(A) Each container in (3)(b)(A) above, except as in (3)(b)(D) above must have these markings:

(B) Marks must be on a metal nameplate attached to the container and visible after installation of the container.

(C) When storing or using LP-Gas and one or more other gases in the same area, the containers must identify their content.

(A) Containers, and first stage regulating equipment if used, must be outside buildings, except under one or more of the following:

(B) Place individual containers with respect to the nearest building or group of buildings according to Table 1. [Table not included. See ED. NOTE.]

(C) Do not stack containers on each other during use.

(D) Keep easily ignitible material such as weeds and long dry grass 10 feet away from containers.

(E) Keep at least 20 feet between liquefied petroleum gas containers and flammable liquid tanks. The minimum separation between a container and the centerline of the dike is 10 feet. This does not apply when LP-Gas containers of 125 gallons or less capacity are next to Class III flammable liquid tanks of 275 gallons or less capacity.

(F) Prevent the accumulation of flammable liquids under adjacent liquefied petroleum gas containers by diking, diversion curbs, grading or the equivalent.

(G) Do not put liquefied petroleum gas containers within the dikes around flammable liquid tanks.

(A) Valves, fittings, and accessories connected directly to the container including primary shutoff valves, must have a rated working pressure of at least 250 p.s.i.g. and be suitable for LP-Gas service. Do not use cast iron. This does not prohibit the use of container valves made of malleable or nodular iron.

(B) Connections to containers, except safety relief connections, liquid level gaging devices, and plugged openings, must have shutoff valves as close to the container as practicable.

(C) Excess flow valves, must close automatically at the rated flows of vapor or liquid as specified by the manufacturer. The connections or line including valves, fittings, etc., being protected by an excess flow valve must have a greater capacity than the rated flow of the excess flow valve.

(D) Liquid level gaging devices do not need excess flow valves if their outward flow is less than would pass through a .055 inch opening.

(E) Openings from the container or through fittings attached directly to it with a pressure gauge connected do not need shutoff or excess flow valves if they are not larger than .055 inch.

(F) Except as in OAR 437-004-0780(4)(e)(A)(ii), excess flow and back pressure check valves required here must be inside the container or at an outside point where the line enters the container. In the latter case, make installation so that strain beyond the excess flow or back pressure check valve will not cause a break between the container and the valve.

(G) Excess flow valves must have a bypass, not to exceed a .040 inch opening to allow equalization of pressures.

(H) Containers with water capacity between 30 gallons and 2,000 gallons, filled by volume and made after December 1, 1963, must fill into the vapor space.

(A) Pipe, except as in OAR 437-004-0780(6)(f)(A), must be wrought iron or steel (black or galvanized), brass, copper, or aluminum alloy. Aluminum alloy pipe must be at least Schedule 40. Do not use alloy 5456. Protect aluminum alloy pipe against external corrosion when it contacts dissimilar metals other than galvanized steel. Also protect it when it is subject to repeated wetting by such liquids as water (except rainwater), detergents, sewage, or leaking from other piping, or it passes through flooring, plaster, masonry, or insulation. Galvanized sheet steel or pipe, galvanized inside and out, is good protection. The maximum nominal pipe size for aluminum pipe is 3/4 inch. Limit pressures to less than 20 p.s.i.g. Do not install aluminum alloy pipe within 6 inches of the ground.

(B) Tubing must be seamless and of copper, brass, steel, or aluminum alloy. Copper tubing must be type K or L or equivalent as covered in the Specification for Seamless Copper Water Tube, ANSI H23.1-1970 (ASTM B88-69). Aluminum alloy tubing must be Type A or B or equivalent as in Specification ASTM B210-68. It must have markings every 18 inches indicating compliance with ASTM Specifications. The minimum nominal wall thickness of copper tubing and aluminum alloy tubing is in Table 2 and Table 3. [Tables not included. See ED. NOTE.]

Protect aluminum alloy tubing against external corrosion when it contacts dissimilar metals other than galvanized steel. Also protect it when it is subject to repeated wetting by liquids such as water (except rainwater), detergents, sewage, or leakage from other piping, or it passes through flooring, plaster, masonry, or insulation. Galvanized sheet steel or pipe, galvanized inside and out, is good protection. The maximum outside diameter for aluminum alloy tubing is 3/4 inch. Limit pressures to less than 20 p.s.i.g. Do not install aluminum alloy pipe within 6 inches of the ground.

NOTE: The standard size to designate tubing is 1/8 inch smaller than its nominal outside diameter.

(C) Pipe jointmay be screwed, flanged, welded, soldered, or brazed with a material with a melting point more than 1,000° F. Joints on seamless copper, brass, steel, or aluminum alloy gas tubing must be made with approved gas tubing fittings, or soldered or brazed with a material having a melting point more than 1,000° F.

(D) For operating pressures of 125 p.s.i.g. or less, fittings must withstand a pressure of at least 125 p.s.i.g. For operating pressures above 125 p.s.i.g., fittings withstand a minimum of 250 p.s.i.g.

(E) You may not use threaded cast iron pipe fittings such as ells, tees, crosses, couplings, and unions. Use aluminum alloy fittings with aluminum alloy pipe and tubing. Use insulated fittings where aluminum alloy pipe or tubing connects with a dissimilar metal.

(F) Strainers, regulators, meters, compressors, pumps, etc., are not pipe fittings. This does not prohibit the use of malleable, nodular, or higher strength gray iron for such equipment.

(G) All materials such as valve seats, packing, gaskets, diaphragms, etc., must be resistant to the action of liquefied petroleum gas.

(H) After assembly, test all piping, tubing, or hose at not less than normal operating pressures. After installation, test piping and tubing with a manometer or similar tester that shows a pressure drop. There must be no leaks. Do not test with a flame.

(I) Use flexible connections to compensate for expansion, contraction, jarring, vibration, and settling.

(J) Piping outside buildings may be buried, aboveground, or both. It must have good support and protection against physical damage. Where soil conditions warrant, protect piping against corrosion. Where condensation may occur, the piping must pitch back to the container, or there must be another way to change the condensate back to a vapor.

(A) Hose must be made of materials that are resistant to the action of LP-Gas. If the hose has wire braid reinforcing, it must be corrosion-resistant.

(B) Mark hose for container pressure "LP-Gas" or "LPG" at least every 10 feet.

(C) Hose for container pressure must have a bursting pressure rating of not less than 1,250 p.s.i.g.

(D) Hose for container pressure must be listed (see definitions in subdivision B).

(E) Hose connections for container pressure must withstand, without leaks, a test pressure of at least 500 p.s.i.g.

(F) Hose and hose connections on the low-pressure side of the regulator or reducing valve must have a bursting pressure rating of not less than 125 p.s.i.g. or five times the set pressure of the relief devices protecting that portion of the system, whichever is higher.

(G) Hose is acceptable on the low-pressure side of regulators to connect to other than domestic and commercial gas appliances if:

(A) Every container except those meeting DOT specifications and every vaporizer (except motor fuel vaporizers and except vaporizers in OAR 437-004-0780(3)(j)(B) (iii) and (5)(d)(E)(i)) whether heated by artificial means or not, must have one or more spring loaded safety relief valves. These valves must allow free venting to the outer air with discharge not less than 5 feet horizontally away from any opening into nearby buildings. The rate of discharge must meet the requirements of (3)(i)(B) or (3)(i)(C) below for vaporizers.

(B) The minimum rate of discharge in cubic feet per minute of air at 120 percent of the maximum permitted start to discharge pressure for safety relief valves on containers other than DOT containers must be as follows: [Table not included. See ED. NOTE.]

(C) Minimum Required Rate of Discharge for Safety Relief Valves for Liquefied Petroleum Gas Vaporizers (Steam Heated, Water Heated, and Direct Fired). Determine the minimum required rate of discharge for safety relief valves as follows:

(D) Container and vaporizer safety relief valves must be set to start-to-discharge, with relation to the design pressure of the container, according to Table 4.

(E) Safety relief devices used with systems having other than DOT containers must discharge at not less than the rates in (3)(i)(B) above, before the pressure is more than 120 percent of the maximum (not including the 10 percent in (3)(i)(D) above) permitted start to discharge pressure setting of the device. [Table not included. See ED. NOTE.]

(F) Some places have continuous high temperatures that require storage of a lower vapor pressure product or the use of a higher designed pressure vessel to prevent the safety valves opening. As an alternative use cooling devices like sprayers, shade or other methods.

(G) Place safety relief valves to discourage tampering. If pressure setting or adjustment is external, the relief valves must have approved means for sealing adjustment.

(H) Shutoff valves must not be between the safety relief devices and the container, or the equipment or piping to which the safety relief device is connected unless there is full required capacity flow through the safety relief device.

(I) Safety relief valves must have direct communication with the vapor space of the container at all times.

(J) Mark each container safety relief valve used with systems covered by OAR 437-004-0780(5), (6), and (8), except as in (6)(c)(C) as follows:

(K) Safety relief valve assemblies, including their connections, must provide the rate of flow required for the container on which they are installed.

(L) A hydrostatic relief valve must be between each pair of shut-off valves on liquefied petroleum gas liquid piping to discharge into a safe atmosphere. The start-to-discharge pressure setting must not be more than 500 p.s.i.g. The minimum setting on relief valves in piping connected to other than DOT containers must not be lower than 140 percent of the container relief valve setting and in piping connected to DOT containers not lower than 400 p.s.i.g. The start-to-discharge pressure setting of a relief valve installed on the discharge side of a pump, must be more than the maximum pressure permitted by the recirculation device in the system.

(M) Safety relief devices must not discharge in or beneath a building, except devices covered by OAR 437-004-0780(3)(f)(A)(i) through (iv), or (4)(d)(A) or (e).

(N) Container safety relief devices and regulator relief vents must be at least five (5) feet in any direction from air openings into sealed combustion system appliances or mechanical ventilation air intakes.

(A) Indirect fired vaporizers using steam, water, or other heating medium must comply with the following:

(B) Atmospheric vaporizers using heat from the ground or surrounding air must be as follows:

(C) Make, mark and install direct gas-fired vaporizers as follows:

(D) Install and use direct gas-fired tank heaters as follows:

(E) The vaporizer section of vaporizer-burners used for dehydrators or dryers must be outside of buildings and as follows:

(A) The "filling density" is the percent ratio of the weight of the gas in a container to the weight of water the container will hold at 60° F. Fill containers according to the filling densities in Table 5. [Table not included. See ED. NOTE.]

(B) Except as in (3)(k)(C) below, any container including mobile cargo tanks and portable tank containers, shipped under DOT jurisdiction or made according to 49 CFR Chapter I Specifications must be charged according to 49 CFR Chapter I requirements.

(C) Portable containers not subject to DOT jurisdiction (such as, but not limited to, motor fuel containers on industrial and lift trucks, and farm tractors in OAR 437-004-0780(6), or containers recharged at the installation) may be filled either by weight, or by volume using a fixed length dip tube gaging device.

(A) Pipe vapor into buildings at pressures more than 20 p.s.i.g. only if the buildings or separate areas:

(B) Liquid is permitted in buildings as follows:

(C) Using an approved automatic quick-closing coupling (a type closing in both directions when coupled in the fuel line); or

(D) Closing the valve nearest to the appliance and allowing the appliance to operate until the fuel in the line is consumed.

(E) Do not take portable containers into buildings except as in OAR 437-004-0780(3)(e)(A).

(A) At least one attendant stays close to the transfer connection, during the transfer of the product.

(B) Do not use or refill containers made according to 49 CFR Part 178 and authorized by 49 CFR Chapter 1 as a "single trip" or "nonrefillable container."

(C) Do not vent gas or liquid to the atmosphere while transferring contents of one container to another, except as in OAR 437-004-0780(6)(e)(D). This does not preclude the use of listed pumps that use LP-Gas vapor as a source of energy. They may vent to the atmosphere at a rate not more than that from a .1200 inch opening. Such venting and liquid transfer must be at least 50 feet from the nearest building.

(D) Filling of fuel containers for industrial trucks or motor vehicles from industrial bulk storage containers must be at least 10 feet from the nearest masonry-walled building or at least 25 feet from the nearest building or other construction and in any case, not less than 25 feet from any building opening.

(E) Filling of portable containers, containers on skids, fuel containers on farm tractors, or similar applications, from storage containers used in domestic or commercial service, must be at least 50 feet from the nearest building.

(F) The filling connection and the vent from the liquid level gages in containers, filled at point of installation, must be at least 10 feet in any direction from air openings into sealed combustion system appliances or mechanical ventilation air intakes.

(G) Gage and charge fuel supply containers only in the open air or in buildings especially for that purpose.

(H) The maximum vapor pressure of the product at 100° F. during transfer into a container must comply with paragraphs OAR 437-004-0780(c)(2) and (d)(3). (For DOT containers use DOT requirements.)

(I) Use only gases for which the system is designed, examined, and listed, particularly regarding pressures.

(J) Pumps or compressors must be designed for use with LP-Gas. When using compressors they must take suction from the vapor space of the container being filled and discharge to the vapor space of the container being emptied.

(K) Pumping systems, with a positive displacement pump, must have a recirculating device that limits the differential pressure on the pump under normal operating conditions to its maximum differential pressure rating. Protect the discharge of the pumping system so that pressure is never more than 350 p.s.i.g. If a recirculation system discharges into the supply tank and has a manual shutoff valve, there must be an adequate secondary safety recirculation system that has no means of making it inoperative. Manual shutoff valves in recirculation systems must be open except during an emergency or when the system is under repair.

(L) When necessary, unloading piping or hoses must have suitable bleeder valves to relieve pressure before disconnection.

(M) Agricultural air moving equipment, including crop dryers, must be off when filling supply containers unless the air intakes and sources of ignition are at least 50 feet from the container.

(N) Agricultural equipment using open flames or equipment with integral containers, such as flame cultivators, weed burners, and, tractors, must be off during refueling.

(A) The track of tank car sidings must be relatively level.

(B) A "Tank Car Connected" sign, as covered by DOT rules, must be at the active end or ends of the siding while the tank car is connected.

(C) While cars are on sidetrack for loading or unloading, block the wheels at both ends.

(D) The employer must insure that an employee is always present during loading or unloading of tank cars or trucks.

(E) A backflow check valve, excess-flow valve, or a shutoff valve with means of remote closing, to protect against uncontrolled discharge of LP-Gas from storage tank piping must be close to the point where the liquid piping and hose or swing joint pipe connect.

(F) Except as in (3)(n)(G) below, when the size (diameter) of the loading or unloading hoses and/or piping is reduced below the size of the tank car or transport truck loading or unloading connections, the adaptors to which lines are attached must have either a backflow check valve, a properly sized excess flow valve, or shutoff valve with means of remote closing, to protect against uncontrolled discharge from the tank car or transport truck.

(G) The requirement of (3)(n)(F) above does not apply if the tank car or transport has a quick-closing internal valve that remotely closes.

(H) The location of the tank car or transport truck loading or unloading point must consider the following:

(A) Fixed electrical equipment in classified areas must comply with OAR 437-004-0780(q). Other electrical equipment and wiring must comply with 4/S.

(B) There must be no open flames or other sources of ignition in vaporizer rooms (except those housing direct-fired vaporizers), pump houses, container charging rooms or other similar locations. Direct-fired vaporizers may not be in pump houses or container charging rooms.

(C) Liquefied petroleum gas storage containers do not require lightning protection.

(D) Since liquefied petroleum gas is in a closed system of piping and equipment, the system does not need to be electrically conductive or electrically bonded for protection against static electricity.

(E) Open flames, cutting or welding, portable electric tools, and extension lights capable of igniting LP-Gas, must not be in classified areas in Table 6 unless the LP-Gas facilities are free of all liquid and vapor. [Table and Figure not included. See ED. NOTE.]

(A) Each container made after December 31, 1965, and filled on a volumetric basis must have a fixed liquid-level gage to indicate the maximum filling level as in OAR 437-004-0780(b)(19)(v). Each container made after December 31, 1969, must have permanently attached to the container adjacent to the fixed level gage a marking showing the percentage full that will be shown by that gage. When there is also a variable liquid-level gage, the fixed gage will also serve as a way to check the variable gage. OAR 437-004-0780(b)(12) requires these gages in charging containers.

(B) Arrange all variable gaging devices so that the maximum allowed liquid level for butane, for a 50 - 50 mixture of butane and propane, and for propane, is readily determinable. The markings indicating the various liquid levels from empty to full must be on the system nameplate or gaging device or part may be on the system nameplate and part on the gaging device. Dials of magnetic or rotary gages must show whether they are for cylindrical or spherical containers and whether for aboveground or underground service. The dials of gages intended for use only on aboveground containers of over 1,200 gallons water capacity must be so marked.

(C) Gaging devices that require bleeding of the product to the atmosphere, such as the rotary tube, fixed tube, and slip tube, must have a bleed valve maximum opening not larger than .0550 inch, unless they have an excess flow valve.

(D) Gaging devices must have a design working pressure of at least 250 p.s.i.g.

(E) Length of tube or position of fixed liquid-level gage must indicate the maximum fill level of the container for the product contained. This level must be based on the volume of the product at 40° F. at its maximum permitted filling density for aboveground containers and at 50° F. for underground containers. The employer must calculate the filling point for which the fixed liquid level gage must be designed according to the method in this subdivision.

(F) Fixed liquid-level gages on containers other than DOT containers must be stamped on the exterior of the gage with the letters "DT" followed by the vertical distance (expressed in inches and carried out to one decimal place) from the top of container to the end of the dip tube or to the centerline of the gage when it is at the maximum permitted filling level. For portable containers that may be filled in the horizontal and/or vertical position the letters "DT" must be followed by "V" with the vertical distance from the top of the container to the end of the dip tube for vertical filling and with "H" followed by the proper distance for horizontal filling. For DOT containers the stamping must be both on the exterior of the gage and on the container. On above-ground or cargo containers where the gages are positioned at specific levels, the marking may be in percent of total tank contents and the marking must be on the container.

(G) Columnar gage glasses must be restricted to charging plants where the fuel is withdrawn in the liquid only. They must have valves with metallic handwheels, excess flow valves, and extra-heavy glass adequately protected with a metal housing applied by the gage manufacturer. They must be shielded against the direct rays of the sun. Do not use columnar gage glasses on tank trucks, motor fuel tanks or on containers used in domestic, commercial, and industrial installations.

(H) Gaging devices of the float, or equivalent type that do not require flow for their operation and with connections extending to a point outside the container do not have to have excess flow valves if the piping and fittings will withstand the container pressure and are properly protected against physical damage.

(A) Except as in (3)(s)(B) below, new commercial and industrial gas consuming appliances must be approved.

(B) If an appliance was made to use a gas other than LP-Gas, it may be used with LP-Gas only after it is properly converted, adapted and tested for performance before placing it in use.

(C) Unattended heaters inside buildings for animal or poultry production or care must have an approved automatic device to shut off the gas if the flame goes out.

(D) Install all agricultural appliances or equipment according to the requirements of this section and the following:

(A) Container markings must comply with DOT regulations. Additional markings not in conflict with DOT regulations are acceptable.

(B) Each container must show its water capacity in pounds or other identified unit of weight unless it is filled and maintained only by the owner or their representative and the water capacity is identified by a code.

(C) Each container must show its tare weight in pounds or other identified unit of weight including all permanently attached fittings but not the cap.

(A) Do not bury containers. This does not prohibit installation below grade level if the container and regulating equipment do not contact the ground. The area must have drainage and ventilate horizontally to the outside air from its lowest level. The outlet must be at least 3 feet away from any building opening that is below it. Except as in OAR 437-004-0780(3)(i)(M), the discharge from safety relief devices must be at least 3 feet horizontally away from any building opening below the level of discharge and must not end beneath any building unless the space has good ventilation and only two enclosed sides.

(B) Containers must be on a firm foundation or otherwise firmly secured. Connect outlet pipes with a flexible or special fitting.

(A) When you must use portable containers inside buildings or structures follow (i) through (xii) below, and other parts of this subparagraph (A) that apply.

(B) Containers with a maximum water capacity of 2-1/2 pounds (nominal 1 pound LP-Gas capacity) are allowed inside buildings as part of approved self-contained hand torch assemblies or similar appliances.

(C) You may use containers in buildings or structures under construction or major renovation and not occupied by the public, as follows:

(D) Containers are allowed in buildings for temporary emergency heating purposes, to prevent damage to the buildings or contents, when the permanent heating system is temporarily out of service, as follows:

(A) Valves in the assembly of multiple container systems must allow replacement of containers without shutting off the flow of gas in the system.

NOTE: This does not require an automatic changeover device.

(B) Firmly attach regulators and low-pressure relief devices to the cylinder valves, cylinders, supporting standards or the building walls. The weather must not affect their operation.

(C) Protect valves and connections to the containers while in transit, in storage, and while being moved into final use, as follows:

(D) Keep outlet valves tightly closed or plugged on unconnected containers, although the containers are empty.

(E) Containers with a water capacity more than 50 pounds (approximately 21 pounds LP-Gas capacity), recharged at the installation, must have excess flow or backflow check valves to prevent the discharge of contents in case of failure of the filling or equalizing connection.

(A) Containers must have safety devices as required by DOT regulations.

(B) A final stage regulator of an LP-Gas system (excluding any appliance regulator) must have on the low-pressure side with a relief valve set to start to discharge within the limits in Table 8. [Table not included. See ED. NOTE.]

(C) When using a regulator or pressure relief valve inside a building for other than purposes in OAR 437-004-0780(3)(e)(A)(i)- (vii), vent the relief valve and the space above the regulator and relief valve diaphragms to the outside air with the discharge outlet at least 3 feet horizontally away from any building opening below the discharge. This does not apply to protected individual appliance regulators nor to OAR 437-004-0780(4)(e) and (3)(i)(m).

(A) The filling pipe inlet terminal must not be inside a building. For containers with a water capacity of 125 gallons or more, such terminals must be at least 10 feet from any building, 5 feet or more from a driveway (see OAR 437-004-0780(3)(e)(B)) and in a protective housing built for the purpose.

(B) The filling connection must have one of the following:

(C) All openings in a container must have approved automatic excess flow valves except in the following: Filling connections in OAR 437-004-0780(5)(c)(B); safety relief connections, liquid-level gaging devices OAR 437-004-0780(3)(f)(D); pressure gage connections in (3)(f)(E).

(D) If the following exist, you do not need an excess flow valve in the withdrawal service line:

(E) All inlet and outlet connections except safety relief valves, liquid level gaging devices and pressure gages on containers of 2,000 gallons water capacity, or more, and on any container that supplies fuel directly to an internal combustion engine, must have labeling to show whether they communicate with vapor or liquid space. Labels may be on valves.

(F) Instead of an excess flow valve, openings may have a quick-closing internal valve that, except during operating periods remains closed. The internal mechanism for such valves may have a secondary control that must have a fusible plug (not more than 220° melting point) that closes the internal valve automatically in case of fire.

(G) There can be only two plugged openings on a container of 2,000 gallons or less water capacity.

(H) Containers of 125 gallons water capacity or more made after July 1, 1961, must have an approved device for liquid evacuation. The minimum size is 3/4 inch National Pipe Thread minimum. A plugged opening does not satisfy this requirement.

(A) All safety devices must comply with the following:

(B) Provide safety devices for aboveground containers as follows:

(A) Vaporizers of less than 1 quart total capacity, heated by the ground or the surrounding air, need not have safety relief valves if adequate tests certified by any of the authorities in OAR 437-004-0780(3)(b), demonstrate that the assembly is safe without them.

(B) Vaporizers must not have fusible plugs.

(A) Above ground containers, except as in (5)(h)(G) below, must have substantial masonry or noncombustible structural supports on firm masonry foundation.

(B) Aboveground containers have support as follows:

(C) Any container may have non-fireproofed ferrous metal supports if mounted on concrete pads or footings, and if the distance from the outside bottom of the container to the ground is not more than 5 feet, if the container is in an isolated location.

(D) Containers may be partially buried if the following requirements are met:

(E) The top of buried containers must be at least 6 inches below grade. Where an underground container might be subject to abrasive action or physical damage due to vehicular traffic or other causes, it must be:

(F)

(G) Containers with attached foundations (portable or semi-portable containers with suitable steel "runners" or "skids" known in the industry as "skid tanks") must comply with these rules subject to the following:

(H) Field welding where necessary must be made only on saddle plates or brackets which were applied by the manufacturer of the tank.

(I) For aboveground containers, secure anchorage or adequate pier height must be provided against possible container flotation wherever sufficiently high floodwater might occur.

(J) When permanently installed containers are interconnected, compensate for expansion, contraction, vibration, and settling of containers, and interconnecting piping. Where flexible connections are used, they must be an approved type and must designed for a bursting pressure of at least five times the vapor pressure of the product at 100° F. Do not use nonmetallic hose for permanently interconnecting such containers.

(K) Container assemblies listed for interchangeable installation above ground or under ground must conform to the requirements for above-ground installations with respect to safety relief capacity and filling density. For installation above ground all other requirements for above-ground installations apply. For installation under ground all other requirements for underground installations apply.

(A) This applies to internal combustion engines, fuel containers, and equipment for the use of LPG as a motor fuel on portable units including self-propelled vehicles.

(B) Paragraph OAR 437-004-0780(5) covers fuel containers and equipment for stationary internal combustion engines using LPG. This does not apply to containers for transportation of liquefied petroleum gases. All of OAR 437-004-0780(3) applies to this paragraph, unless otherwise noted in OAR 437-004-0780(3).

(A) Do not fuel vehicles while passengers are on board.

(B) Fuels industrial trucks (including forklifts) with permanently mounted fuel tanks outdoors. Charging equipment must comply with paragraph (8).

(C) LP-Gas fueled industrial trucks must comply with the Standard for Type Designations, Areas of Use, Maintenance and Operation of Powered Industrial Trucks, NFPA 505-1969.

(D) Engines on vehicles must be off while fueling if the fueling operation involves venting to the atmosphere.

(A) Except as in (6)(c)(B) and (C) below, containers must comply with Table 10.

(B) Fuel containers for use in industrial trucks (including forklifts) must be either DOT containers authorized for LP-Gas service with a minimum service pressure of 240 p.s.i.g. or minimum Container Type 250. Under 1950 and later ASME codes, this means a 312.5p.s.i.g. design pressure container. [Table not included. See ED. NOTE.]

(C) Containers made and maintained under DOT specifications and regulations are acceptable fuel containers. They must conform to all requirements of this paragraph.

(D) All container inlets and outlets except safety relief valves and gaging devices must have labels that designate whether they link to vapor or liquid space. Labels may be on valves.

(A) Containers must be in a place that minimize the possibility of damage. Containers in the rear of trucks and buses, when protected by bumpers, comply. Fuel containers on passenger-carrying vehicles must be as far from the engine as practicable. There must be a seal between the passenger space or any space with radio equipment and the container space to prevent direct seepage of gas to these spaces. The container compartment must vent to the outside. If the fuel container is near the engine or the exhaust system, shield it from direct heat.

(B) Mount all fuel containers to prevent jarring loose, slipping, or rotating. The fastenings must withstand static loading in any direction equal to twice the weight of the tank and attachments when filled using a safety factor of not less than four. Only do field welding on saddle plates, lugs or brackets, originally attached to the container by the manufacturer.

(C) Permanently install fuel containers on buses.

(A) Container valves and accessories must have a rated working pressure of at least 250 p.s.i.g., and suitable for use on a liquefied petroleum gas service.

(B) The filling connection must have an approved double back-pressure check valve, or a positive shutoff in conjunction with an internal back-pressure check valve. On a removable container the filler valve may be a hand operated shutoff valve with an internal excess flow valve. Main shutoff valves on the container on liquid and vapor lines must be readily accessible.

(C) With the exceptions of (D)(iii) below, filling connections with approved automatic back-pressure check valves, and safety relief valves, all connections to containers with openings for the flow of gas more than .055 inch must have approved automatic excess flow valves.

(D) Liquid-level gaging devices:

(A) Pipe from fuel container to first-stage regulator must be at least schedule 80 wrought iron or steel (black or galvanized), brass or copper; or seamless copper, brass, or steel tubing. Steel tubing must have a minimum wall thickness of 0.049 inch. Steel pipe or tubing must have protection against exterior corrosion. Copper tubing must be types K or L or equivalent with a minimum wall thickness of 0.032 inch. Approved flexible connections may be used between container and regulator or between regulator and gas-air mixer within the limits of approval. Do not use aluminum pipe or tubing. For removable containers use an approved flexible connection between the container and the fuel line.

(B) Install, brace and support all piping to reduce to a minimum the possibility of vibration strains or wear.

(A) Use only spring-loaded internal type safety relief valves on motor fuel containers.

(B) The discharge outlet from safety relief valves must be on the outside of enclosed spaces and as far as practicable from possible sources of ignition. It must vent upward within 45 degrees of the vertical to prevent impingement of escaping gas on containers, or parts of vehicles, or on vehicles in adjacent lines of traffic. Use a rain cap or other protector to keep water and dirt from collecting in the valve.

(C) When using a discharge line from the container safety relief valve, the line must be metallic, other than aluminum, and may not restrict the required flow of gas from the safety relief valve. Such discharge line must be able to withstand the pressure resulting from the discharge of vapor when the safety relief valve is fully open. When flexibility is necessary, use flexible metal hose or tubing.

(D) You can fill portable containers with volumetric filling in either the vertical or horizontal position only if the safety relief valve links with the vapor space.

(E) Paragraph OAR 437-004-0780(3)(i)(L) for hydrostatic relief valves applies.

(A) Vaporizers and any part thereof and other devices that may be subjected to container pressure must have a design pressure of at least 250 p.s.i.g.

(B) Each vaporizer must have a valve or suitable plug which will permit substantially complete draining of the vaporizer. It must be located at or near the lowest portion of the section occupied by the water or other heating medium.

(C) Securely fasten vaporizers to minimize the possibility of their becoming loose.

(D) Permanently mark each vaporizer at a visible point as follows:

(E) Devices to supply heat directly to a fuel container must have an automatic device to cut off the supply of heat before the pressure inside the fuel container reaches 80 percent of the start to discharge pressure setting of the safety relief device on the fuel container.

(F) Engine exhaust gases are acceptable as a direct source of heat supply for the vaporization of fuel if the materials of construction of those parts of the vaporizer in contact with exhaust gases are resistant to the corrosive action of exhaust gases and the vaporizer system is designed to prevent excessive pressures.

(G) Vaporizers must not have fusible plugs.

(A) Approved automatic pressure reducing equipment must be between the fuel supply container and gas-air mixer to reduce the pressure of the fuel delivered to the gas-air mixer.

(B) An approved automatic shutoff valve must be in the fuel system ahead of the inlet of the gas-air mixer, to prevent flow of fuel to the mixer when the ignition is off and the engine is not running. For industrial trucks and engines operating in buildings other than those that exclusively house engines, the automatic shutoff valve must operate if the engine stops. Atmospheric type regulators (zero governors) are adequate as an automatic shutoff valve only in outdoor operation such as farm tractors, irrigation pump engines, and on other outdoor stationary engines.

(C) The source of the air for combustion must be completely isolated from the passenger compartment, ventilating system, or air conditioning system.

(A) Only use portable engines in buildings for emergencies, except as in OAR 437-004-0780(10).

(B) Exhaust gases must discharge outside the building or to an area where they are not hazard.

(C) There must be sufficient air for combustion and cooling.

(D) An approved automatic shutoff valve must be in the fuel system ahead of the engine, to prevent flow of fuel to the engine when the ignition is off or if the engine stops.

(E) The capacity of LP-Gas containers used with such engines must comply with OAR 437-004-0780(4)(e).

(A) LP-Gas-fueled industrial trucks are permitted in buildings and structures.

(B) No more than two LP-Gas containers can be on an industrial truck for motor fuel purposes.

(C) Do not leave industrial trucks unattended near sources of ignition.

(A) LP-Gas-fueled vehicles may be stored or serviced inside garages.

(B) Keep the shutoff valve closed on LP-Gas-fueled vehicles being repaired in garages except when the engine must run.

(A) Do not store containers near sources of heat or ignition or near stairs or exits.

(B) Keep the outlet valves of stored containers closed.

(C) Empty containers, stored inside, that have held LP-Gas are treated like full containers when calculating the maximum quantity of LP-Gas permitted by this paragraph.

(A) Do not store more than 10,000 pounds of LP-Gas in special buildings or rooms.

(B) The walls, floors, and ceilings of container storage rooms that are within or next to other parts of the building must have at least a 2-hour fire resistance rating.

(C) Part of the exterior walls or roof with an area at least 10 percent of the combined area of the enclosing walls and roof must be of explosion relieving construction.

(D) Each opening from such storage rooms to other parts of the building must have a 1-1/2 hour (B) fire door listed by a nationally recognized testing laboratory. Refer to § 1910.7 for definition of nationally recognized testing laboratory.

(E) The must be no open flames in the rooms.

(F) The rooms must have adequate ventilation both top and bottom to the outside only. The openings from such vents must be at least 5 feet away from any other opening into any building.

(G) The floors of such rooms must not be below ground level.

(H) The rooms may not adjoin a property line occupied by schools, churches, hospitals, athletic fields or other public gathering places.

(I) Fixed electrical equipment must comply with OAR 437-004-0780(3)(o).

(A) Storage outside buildings, for containers awaiting use, must comply with Table 11 with respect to:

(B) Containers must be in a suitable enclosure or otherwise protected against tampering.

(A) A filling connection on the container must have one of the following:

(B) A filling pipe inlet terminal not on the container must have a positive shutoff valve in conjunction with either:

(C) All openings in the container except those below must have approved excess flow check valves:

(D) All container inlets and outlets except those listed below must have labels to designate whether they connect with vapor or liquid (labels may be on valves):

(E) Each storage container must have a suitable pressure gage.

(A) All safety-relief devices must be as follows:

(B) Above ground containers must have safety relief valves as follows:

(C) Underground containers must be provided with safety relief valves as follows:

(A)

(B) Above ground containers must comply with this subdivision.

(C) Underground containers must be installed in accordance with this subdivision.

(A) Piping may be underground, aboveground, or a combination of both.

(B) Piping beneath driveways must have protection from vehicle damage.

(C) Piping must be wrought iron or steel (black or galvanized), brass or copper pipe; or seamless copper, brass, or steel tubing and suitable for a minimum pressure of 250 p.s.i.g. Pipe joints may be screwed, flanged, brazed, or welded. Do not use aluminum alloy piping or tubing.

(D) All shutoff valves (liquid or gas) must be suitable for liquefied petroleum gas service and designed for not less than the maximum anticipated operating pressure. Valves that may experience container pressure must have a rated working pressure of at least 250 p.s.i.g.

(E) All materials used for valve seats, packing, gaskets, diaphragms, etc., must be resistant to the action of LP-Gas.

(F) Fittings must be steel, malleable iron, or brass with a minimum working pressure of 250 p.s.i.g. Do not use cast iron pipe fittings.

(G) After assembly, test all piping to assure it is free of leaks at not less than normal operating pressures.

(A) Meters, vapor separators, valves, and fittings in the dispenser must be suitable for LP-Gas service and have a minimum working pressure of 250 p.s.i.g.

(B) Vent LP-Gas in a dispensing device to a safe location.

(C) Pumps used to transfer LP-Gas must allow control of the flow and prevent leakage or accidental discharge. There must be a way outside the dispensing device to shut off the power in case of fire or accident.

(D) A manual shutoff valve and an excess flow check valve must be downstream of the pump and ahead of the dispenser inlet.

(E)

(F)

(G) The dispensing of LP-Gas into the fuel container of a vehicle must be done by a competent attendant who stays at the LP-Gas dispenser during the entire transfer operation.