Section 296-826-50005. Appurtenance requirements for all systems.

(1) You must make sure each appurtenance installed before February 8, 1973, is determined to be safe by meeting one of the following:

(a) Approved, tested, and installed by either:

(i) The American National Standard for the Storage and Handling of Anhydrous Ammonia (in effect at the time of installation);

(ii) The Fertilizer Institute Standards for the Storage and Handling of Agricultural Anhydrous Ammonia (in effect at the time of installation).

(b) Accepted, certified, listed, or labeled, by a nationally recognized testing laboratory.

(c) Inspected or tested by a federal, state, municipal, or local authority responsible for enforcing occupational safety provisions, when no nationally recognized laboratory will provide approval.

(d) Tested and approved by a registered professional engineer or other qualified person if the system is a custom-designed or custom-built unit and no other recognized entity will provide approval.

(2) You must keep a document on file signed by the qualified person that indicates the unit is safe. Include the test bases, test data and results and the qualifications of the qualified person.

(3) You must make sure container appurtenances are both of the following:

(a) Designed for at least the working pressure for the portion of the system where installed; and

(b) Fabricated from materials suitable for anhydrous ammonia service.

(4) You must make sure fixed liquid level gauges, except on refrigerated storage:

(a) Are designed so the maximum volume of the container filled by liquid does not exceed eighty-five percent of its water capacity; and

(b) Have a coupling into which it is threaded that is placed at the eighty-five percent level of the container.

If located elsewhere, install the dip tube of this gauge so it can not be easily removed.

(5) You must equip each container, except those filled by weight, with an approved liquid level gauging device that does all of the following:

(a) Has a design pressure equal to or greater than the design pressure of the container;

(b) Is arranged so the maximum liquid fill level of containers can be readily determined.

(6) You must follow additional requirements found in Table 5, Appurtenance Requirements for all Systems.

Table 5

Appurtenance Requirements for all Systems

(7) You must follow Table 6, Safety Valve Start to Discharge Rate, and Table 7, Safety Relief Valve Rate of Discharge, for the following systems:

(a) Nonrefrigerated stationary containers;

(b) Mounted on trucks, semi-trailers, and trailers used for the transportation of ammonia;

(c) Mounted on farm wagons for the transportation of ammonia;

(d) Mounted on farm equipment for the application of ammonia.

EXEMPTION:	The rate of discharge of spring-loaded safety relief valves installed on underground containers may be reduced to thirty percent of the rate of discharge specified in Table 6, Safety Relief Valve Rate of Discharge so long as the container is not uncovered after installation until the liquid ammonia has been removed.

Table 6

Safety Valve Start to Discharge Rate

Note:	A relief valve manufacturer's tolerance of plus ten percent is permitted.

Instructions are found below the table

Table 7

Safety Relief Valve Rate of Discharge

Table instructions:

1. The surface area = the total outside surface area of the container in square feet.

2. When the surface area is not stamped on the name plate or the marking is not legible, calculate the area by using the Table 8, Surface Area.

Table 8

Surface Area

Flow rate: CFM air = cubic feet per minute of air required at standard conditions, 60°F and atmospheric pressure (14.7 psia).

1. The rate of discharge may be altered for intermediate values of surface area.

2. For containers with total outside surface area greater than 2,500 sq. ft., the required flow rate can be calculated using the formula, flow rate CFM air = 22.11 A0.82 where A = outside surface area of the container in square feet.

[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050. WSR 15-23-086, § 296-826-50005, filed 11/17/15, effective 12/18/15. Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. WSR 06-10-067, § 296-826-50005, filed 5/2/06, effective 9/1/06.]

RCW 49.17.010, 49.17.040, 49.17.050. WSR 15-23-086, § 296-826-50005, filed 11/17/15, effective 12/18/15. Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. WSR 06-10-067, § 296-826-50005, filed 5/2/06, effective 9/1/06.