Section 336.1604. Storage of organic compounds having true vapor pressure of more than

1.5    psia,  but   less  than  11  psia,  in   existing  fixed  roof   stationary  vessels  of   more  than 40,000-gallon capacity.

(1) After April 30, 1981, it is unlawful for a person to store any organic compound having a true vapor pressure of more than 1.5 psia, but less than 11 psia, at actual storage conditions in any existing fixed roof stationary vessel of more than 40,000-gallon capacity, unless 1 of the following conditions is met:

(a)    The vessel is a pressure tank capable of maintaining working pressures sufficient to prevent organic vapor or gas loss to the atmosphere at all times, except under emergency conditions.

(b)   The vessel is equipped and maintained with a floating cover or roof which rests upon, and is supported by, the liquid being contained and has a closure seal or seals to reduce the space between the cover or roof edge and the vessel wall. The seal or any seal fabric shall not have visible holes, tears, or other nonfunctional openings.

(c)    The vessel is equipped and maintained with a vapor recovery system, or other control system approved by the department, which recovers not less than 90%, by weight, of the uncontrolled organic vapor that would otherwise be emitted into the atmosphere.

(2)   All openings, except stub drains, in any stationary vessel subject to the provisions of this rule shall be equipped with covers, lids, or seals so that all of the following conditions are met:

(a)   The cover, lid, or seal is in the closed position at all times, except when in actual use.

(b)   Automatic bleeder vents are closed at all times, except when the roof is floated off, or landed on, the roof leg supports.

(c)   Rim vents, if provided, are set at the manufacturer's recommended setting or are set to open when the roof is being floated off the roof leg supports.

History: 1980 AACS; 2002 AACS.