46 C.F.R. § 38.15-1 Filling of tanks—TB/ALL.
Title 46 - Shipping
(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=0.98dr V/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.
Title 46: Shipping
PART 38—LIQUEFIED FLAMMABLE GASES
Subpart 38.15—Special Requirements
§ 38.15-1 Filling of tanks—TB/ALL.
Table 38.15-1(b)_Maximum Permissible Filling Densities for Tanks Operating At or Near Ambient Temperature------------------------------------------------------------------------ Maximum permitted filling density ------------------------------- Unlagged tanks_water Specific gravity at 60 °F. capacity Lagged -------------------- tanks_all 1,200 Over capacities gal. and 1,200 under gal.------------------------------------------------------------------------0.473-0.480............................. 38 41 420.481-0.488............................. 39 42 430.489-0.495............................. 40 43 440.496-0.503............................. 41 44 450.504-0.510............................. 42 45 460.511-0.519............................. 43 46 470.520-0.527............................. 44 47 480.528-0.536............................. 45 48 490.537-0.544............................. 46 49 500.545-0.552............................. 47 50 510.553-0.560............................. 48 51 520.561-0.568............................. 49 52 530.569-0.576............................. 50 53 540.577-0.584............................. 51 54 550.585-0.592............................. 52 55 560.593-0.600............................. 53 56 570.601-0.608............................. 54 57 580.609-0.617............................. 55 58 590.618-0.626............................. 56 59 600.627-0.634............................. 57 60 61------------------------------------------------------------------------Note: Increase in filling densities to provide for seasonal changes may be considered by the Commandant upon presentation of factual evidence that safe operation can be effected.
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