Washington Administrative Code

This section applies to systems mounted on farm equipment that are used for the field application of ammonia.WAC 296-307-40011 through 296-307-40037 also apply unless otherwise noted.(1) All containers must be securely mounted.(2) Container valves and accessories must meet the fo…

All equipment must be approved by one of the following methods:(1) The equipment was installed before February 8, 1973, and was approved and tested, and installed according to either the requirements of the American National Standard for the Storage and Handling of Anhydrous Ammo…

The code is the Unfired Pressure Vessel Code of the American Society of Mechanical Engineers (Section VIII of the ASME Boiler Construction Code), 1952, 1956, 1959, 1962, 1965, 1968 and 1971 editions, the joint code of the American Petroleum Institute and the American Society of M…

(1) System nameplates, when required, must be permanently attached to the system so they are readily accessible for inspection.(2) Each container or system covered in WAC 296-307-40005 and 296-307-40007 must be marked as follows:(a) With indication that the container or system me…

(1) When selecting the location for a storage container, the employer must take into account the physiological effects of ammonia and adjacent fire hazards. Containers located indoors must be in areas especially approved for container storage.(2) Containers must be located at lea…

(1) All accessories must be designed for at least the maximum working pressure of the part of the system on which they are installed. All accessories must be fabricated from materials suitable for anhydrous ammonia service.(2) All connections to containers must have shut-off valv…

(1) All piping, tubing and fittings must be made of material suitable for anhydrous ammonia service.(2) All piping, tubing and fittings must be designed for a pressure of at least the maximum pressure to which they may be subjected in service.(3) All piping must be well supported…

(1) Hose used in ammonia service and subject to container pressure must meet the requirements of the joint Rubber Manufacturers Association and the Fertilizer Institute "Hose Specifications for Anhydrous Ammonia."(2) Hose subject to container pressure must be designed for a minim…

(1) Every container used in systems covered by WAC 296-307-400 must have one or more spring-loaded safety-relief valves or the equivalent.(2) The discharge from safety-relief valves must be vented away from the container, upward, and unobstructed to the atmosphere. All safety-rel…

(1) The employer must train employees required to handle ammonia in the safe operating practices and the proper action to take in an emergency. Employees must be instructed to use the equipment listed in subsection (3) of this section in an emergency.(2) If ammonia system leaks, …

Filling density means the percent ratio of the weight of the gas in a container to the weight of water at 60°F that the container will hold. One pound of water equals 27.737 cubic inches at 60°F. To determine the weight capacity of the tank in pounds, the weight of a gallon (231 …

(1) Anhydrous ammonia must always be at a temperature suitable for the material of construction and design of the receiving containers. Ordinary steels are not suitable for refrigerated ammonia. See Appendix R of API Standard 620 "Recommended Rules for Design and Construction of …

(1) Provisions for unloading tank cars must meet DOT requirements.(2) Unloading operations must be performed by reliable employees who are properly instructed and responsible for careful compliance with all procedures.(3) Caution signs must be placed on the track or car to give n…

(1) Each container except those filled by weight must have an approved liquid-level gauging device.(2) All gauging devices must be arranged so that the maximum liquid level to which the container is filled is easily determined.(3) Gauging devices that require bleeding of the prod…

Aboveground uninsulated containers should have a reflective surface maintained in good condition. We recommend white for painted surfaces, but other light reflecting colors are acceptable.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 2…

(1) Electrical equipment and wiring for use in ammonia installations must be general purpose or weather resistant as appropriate.(2) Where concentrations of ammonia in the air in excess of 16% by volume are likely to be encountered, electrical equipment and wiring must be specifi…

[WSR 97-09-013, recodified as § 296-307-410, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-410, filed 10/31/96, effective 12/1/96.]

Chapter 296-307 WAC Part U2 covers the storage and handling of liquefied petroleum gases.The requirements of WAC 296-307-410 apply to all LP-gas installations covered by this part.For additional requirements related to:See WAC:Cylinder systems 296-307-415Systems using non-DOT con…

(1) This part does not apply to:(a) LP-gas refrigerated storage systems;(b) LP-gas used with oxygen;(c) LP-gas used in utility gas plants (covered by the National Fire Protection Association Standard for the Storage and Handling of Liquefied Petroleum Gases at Utility Gas Plants,…

Adequate ventilation (for fire prevention during normal operation). The concentration of the gas in a gas-air mixture does not exceed 25% of the lower flammable limit.Containers. All vessels, such as tanks, cylinders, or drums, used to transport or store LP-gases.DOT. The federal…

The employer must ensure that all LP-gas is odorized by an approved agent to indicate by distinct odor, the presence of gas down to concentration in air of a maximum of 1/5 the lower limit of flammability.Exception:Odorization is not required if it will create a hazard in further…

(1) Each system of DOT containers must have approved container valves, connectors, manifold valve assemblies, and regulators.(2) Each non-DOT system using containers of 2,000 gallons or less water capacity, must have a container assembly, one or more regulators, and other necessa…

(1) Containers must be designed, constructed, and tested according to 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, unless otherwise specified.(2) Co…

(1) The employer must ensure that all welding to the shell, head, or any other part of the container subject to internal pressure, meets the requirements of the code under which the tank was fabricated. The employer may weld on saddle plates, lugs, or brackets attached to the con…

(1) The employer must ensure that containers are marked according to DOT regulations or with the following:(a) Indication that the container meets the requirements of the code under which it is constructed, and all marks required by that code.(b) Indication whether the container …

The employer must ensure that containers are located according to the following:(1) Containers and first stage regulating equipment are located outdoors.Containers may be located indoors under any of the following conditions:(a) In buildings used exclusively for container chargin…

(1) Valves, fittings, and accessories connected directly to the container including primary shut-off valves, must have a rated working pressure of at least 250 psig and must be of material and design suitable for LP-gas service. The use of cast iron for container valves, fittings…

(1) Pipe must be wrought iron or steel (black or galvanized), brass, copper, or aluminum alloy. Aluminum alloy pipe must be at least Schedule 40 according to the specifications for Aluminum Alloy Pipe, ANSI H38.7-1969 (ASTM, B241-1969), and must be suitably marked at each end of …

(1) Hose must be fabricated of materials that are resistant to the action of LP-gas in the liquid and vapor phases. If wire braid is used for reinforcing the hose, it must be of corrosion-resistant material such as stainless steel.(2) Hose subject to container pressure must be ma…

(1) Every container except those constructed according to DOT specifications and every vaporizer (except motor fuel vaporizers and vaporizers described in WAC 296-307-41029(3) and 296-307-42007 (6)(a) whether heated by artificial means or not, must have one or more safety-relief …

Indirect fired vaporizers utilizing steam, water, or other heating medium must be constructed and installed according to the following:(1) Vaporizers must be constructed according to the requirements of WAC 296-307-41011 and must be permanently marked as follows:(a) With the code…

Atmospheric vaporizers using heat from the ground or surrounding air must be installed as follows:(1) Buried underground; or(2) Located inside the building near where the pipe enters the building, if the capacity of the unit does not exceed one quart;(3) Vaporizers of less than o…

Direct gas-fired vaporizers must be constructed, marked, and installed as follows:(1) According to the requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, 1968, that apply to the maximum working conditions for which the vaporizer is desig…

Direct gas-fired tank heaters must be constructed and installed as follows:(1) Direct gas-fired tank heaters, and tanks to which they are applied, must only be installed aboveground.(2) Tank heaters must be permanently marked with the name of the manufacturer, the rated Btu input…

The vaporizer section of vaporizer-burners used for dehydrators or dryers must be located outdoors; they must be constructed and installed as follows:(1) Vaporizer-burners must have a minimum design pressure of 250 psig with a factor safety of five.(2) Manually operated positive …

(1)Filling density. The percent ratio of the weight of the gas in a container to the weight of water the container will hold at 60°F. All containers must be filled according to the filling densities shown in Table U-4.TABLE U-4MAXIMUM PERMITTED FILLING DENSITY Aboveground contain…

(1) Vapor may be piped into buildings at pressures over 20 psig only if the buildings or separate areas thereof:(a) Are constructed according to this section;(b) Are used exclusively to house equipment for vaporization, pressure reduction, gas mixing, gas manufacturing, or distri…

When transferring liquids, the employer must ensure that:(1) At least one attendant remains close to the transfer connection from the time the connections are first made until they are finally disconnected, during the transfer of the product.(2) Containers must be filled or used …

Workers performing installation, removal, operation, and maintenance work must be properly trained in that function.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-41043, filed 10/20/20, effective 11/20/20. WSR 97-09-013, recodif…

(1) Open flames or other sources of ignition are prohibited in vaporizer rooms (except those housing direct-fired vaporizers), pumphouses, container charging rooms or other similar locations. Direct-fired vaporizers are prohibited in pumphouses or container charging rooms.Note:LP…

(1) Electrical equipment and wiring must be specified by and installed according to chapter 296-307 WAC Part T, for ordinary locations.(2) Fixed electrical equipment and wiring installed within classified areas must comply with Table U-5 and must be installed according to chapter…

(1) Each container manufactured after December 31, 1965, and filled on a volumetric basis must have a fixed liquid-level gauge to indicate the maximum permitted filling level according to subsection (5) of this section. Each container manufactured after December 31, 1969, must ha…

(1) New commercial and industrial gas consuming appliances must be approved.Exception:Any appliance that was originally manufactured for operation with a gaseous fuel other than LP-gas and is in good condition may be used with LP-gas only after it is properly converted, adapted, …

[WSR 97-09-013, recodified as § 296-307-415, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-415, filed 10/31/96, effective 12/1/96.]

WAC 296-307-415 applies to systems using DOT containers. Cylinder systems must meet all requirements of WAC 296-307-410 (unless otherwise indicated) and the additional requirements of this section.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21…

Cylinder system. Includes the container base or bracket, containers, container valves, connectors, manifold valve assembly, regulators, and relief valves.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-41503, filed 10/20/20, effe…

(1) Containers must be marked according to DOT regulations. Additional markings that do not conflict with DOT regulations may be used.(2) Each container must be marked with its water capacity in pounds or other identified unit of weight.(3) Exception: If the employer is the only …

(1) Containers must not be buried below ground. However, systems may be installed in a compartment or recess below grade level, such as a niche in a slope or terrace wall that is used for no other purpose, if the container and regulating equipment are not in contact with the grou…

(1) When portable containers are necessary and it is not practical to use them outdoors, containers and equipment may be used indoors only if they meet the requirements of this section.(a) Containers in use. Connected for use.(b) Systems using containers with a water capacity gre…

(1) Valves in the assembly of multiple container systems must be arranged so that containers can be replaced without shutting off the flow of gas in the system.Note:An automatic changeover device is not required.(2) Regulators and low-pressure relief devices must be rigidly attac…