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PDFWAC 296-307-40029

What requirements apply to filling densities?

Filling density means the percent ratio of the weight of the gas in a container to the weight of water at 60°F that the container will hold. One pound of water equals 27.737 cubic inches at 60°F. To determine the weight capacity of the tank in pounds, the weight of a gallon (231 cubic inches) of water at 60°F in air must be 8.32828 pounds.
(1) The filling densities for nonrefrigerated containers must not exceed the following:
 
Aboveground
Underground
(i) Uninsulated
56%
58%
(ii) Insulated
57%
(iii) DOT containers shall be filled according to DOT regulations.
This corresponds to 82% by volume at -28°F, 85% by volume at 5°F, 87.5% by volume at 30°F, and 90.6% by volume at 60°F.
(2) When containers are filled according to liquid level by any gauging method other than a fixed length dip tube gauge, each container should have a thermometer well so that the internal liquid temperature can be easily determined and the amount of liquid and vapor in the container corrected to a 60°F basis.
[WSR 97-09-013, recodified as § 296-307-40029, 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-40029, filed 10/31/96, effective 12/1/96.]
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