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 one quart capacity heated by the ground or surrounding air, may be installed without safety-relief valves if tests show that the assembly is safe.
[WSR 97-09-013, recodified as § 296-307-41029, 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-41029, filed 10/31/96, effective 12/1/96.]