Section 296-826-50015. Refrigerated tanks.

Important:

In addition to this section, you need to follow the Appurtenances requirements for all systems, WAC 296-826-50005.

(1) You must protect container appurtenances against the following:

(a) Physical damage during transit of containers intended for underground installation;

(b) Damage from vehicles.

(2) You must make sure safety relief devices have a total relieving capacity larger than either of the following:

(a) A possible refrigeration system upset such as a cooling water failure, power failure, instrument air or instrument failure, mechanical failure of any equipment, excessive pumping rates or changing atmospheric pressure; or

(b) The amount based on using either one of the following fire exposure formulas (see note below for codes):

(i) Valve manufacturers who use weight of vapors to be relieved as the classifying basis, use this formula:

(ii) Valve manufacturers that classify valves based on air flows, use this formula:

(3) You must make sure safety relief devices meet the following additional requirements:

(a) Are set to start-to-discharge at a pressure not in excess of the design pressure of the tank;

(b) Have a total relieving capacity sufficient to prevent a maximum pressure in a tank of more than one hundred twenty percent of the design pressure.

(4) You must provide shut off valves for all connections including plugs, safety valves, and thermometer wells.

Locate them as close to the tank as is practical.

EXEMPTION:	Shut off valves do not need to be provided on connections with a No. 54 drill size restriction.

Note:	Install, when operating conditions make it advisable, both of the following:
	1. A check valve on the fill connection;
	2. A remotely operated shut off valve on other connections located below the maximum liquid level.

(5) You must follow requirements found in Table 10, Refrigerated Tank Appurtenances.

Table 10

Refrigerated Tank Appurtenances

(6) You must make sure appurtenances meet all of the requirements found in the following:

(a) ANSI CGA C-7 2004;

(b) ANSI CGA G2.1 1999;

(c) API Standard 620 4th Edition, 2002;

(d) ASHRAE 15 2004;

(e) ASME 2001, Section VIII, Division 1;

(f) ANSI B95.1 1977.

[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050. WSR 15-23-086, § 296-826-50015, 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, § 296-826-50015, filed 5/2/06, effective 9/1/06.]

RCW 49.17.010, 49.17.040, 49.17.050. WSR 15-23-086, § 296-826-50015, 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, § 296-826-50015, filed 5/2/06, effective 9/1/06.

Rules

296-826-50005,