[Code of Federal Regulations]
[Title 46, Volume 1]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR38.15-1]
[Page 504]
TITLE 46--SHIPPING
CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
PART 38_LIQUEFIED FLAMMABLE GASES--Table of Contents
Subpart 38.15_Special Requirements
Sec. 38.15-1 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=0.98dr 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[deg] F.
Table 38.15-1(b)--Maximum Permissible Filling Densities for Tanks
Operating At or Near Ambient Temperature
------------------------------------------------------------------------
Maximum permitted filling density
-------------------------------------------
Specific gravity at 60 Unlagged tanks--water capacity
[deg]F. -------------------------------- Lagged
1,200 gal. and Over 1,200 tanks--all
under gal. capacities
------------------------------------------------------------------------
0.473-0.480................. 38 41 42
0.481-0.488................. 39 42 43
0.489-0.495................. 40 43 44
0.496-0.503................. 41 44 45
0.504-0.510................. 42 45 46
0.511-0.519................. 43 46 47
0.520-0.527................. 44 47 48
0.528-0.536................. 45 48 49
0.537-0.544................. 46 49 50
0.545-0.552................. 47 50 51
0.553-0.560................. 48 51 52
0.561-0.568................. 49 52 53
0.569-0.576................. 50 53 54
0.577-0.584................. 51 54 55
0.585-0.592................. 52 55 56
0.593-0.600................. 53 56 57
0.601-0.608................. 54 57 58
0.609-0.617................. 55 58 59
0.618-0.626................. 56 59 60
0.627-0.634................. 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.