Section 135.199. Requirements for design of pressure relief and limiting devices additions [49 CFR 192.199].

 

(1)  After 49 CFR 192.199 (e), insert:

(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;

(2)  After 49 CFR 192.199 (h), insert:

(hw) Acceptable methods for complying with 49 CFR 192.199 (h) are:

(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.

Cr. Register, October, 1999, No. 526 , eff. 11-1-99; correction in (2) (iw) made under s. 13.93 (2m) (b) 7., Stats., Register February 2004, No. 578 .