§ 38.15-1 — -1 Filling Of Tanks—Tb/all

(a) Refrigerated and semirefrigerated tanks shall be filled so that there is an outage of at least 2 percent of the volume of the tank at the temperature corresponding to the vapor pressure of the cargo at the safety relief valve setting. A reduction in the required outage may be permitted by the Commandant when warranted by special design considerations. Normally then, the maximum volume to which a tank may be loaded is:

VL = 0.98drV/dL

where:

VL = maximum volume to which tank may be loaded.

V = volume of tank.

dr = density of cargo at the temperature required for a cargo vapor pressure equal to the relief valve setting.

dL = density of cargo at the loading temperature and pressure.

(b) Nonrefrigerated tanks shall be filled so that their filling densities shall not exceed the ratios indicated in table 38.15-1(b).

(c) The “filling density” is defined as the percent ratio of the weight of the gas in a tank to the weight of water the tank will hold at 60 °F.

Table 38.15-1(b)—Maximum Permissible Filling Densities for Tanks Operating At or Near Ambient Temperature