g) Factory Mutual Engineering Corp. (FM), Loss
Prevention Data, Liquid Petroleum Gas, Section 7-55,12-28.
10.2.3.1 General Design Considerations. LPG may be received
by truck, rail, or water for either cylinder (bottled gas) or
10.2.3.2 Transfer Methods. Design the facility to
accommodate one of the following transfer methods:
a) No pumping or pressurizing facilities are
required for small bulk systems utilizing truck delivery. Use
pumping equipment provided on trucks instead of stationary
for off-loading tank cars or waterborne LPG tanks to operate,
(1) Provide compressor and piping to take suction
from the vapor space of the storage tanks to be filled through
an equalizing line and pressurize the tank to be off-loaded.
This forces the LPG out through the liquid off-loading line
into the storage tank.
(2) Arrange the piping so that after all liquid
has been evacuated, the compressor suction can be reversed to
pump the LPG gas from the delivery tank to the storage tank
through a subsurface dip tube.
(3) Provide connections and valving to allow
bleeding of the liquid propane from the connection after
shutting off the valve at both the hose end and at the off-
loading piping. This is done after off-loading the liquid
from either a transport truck or a tank car. Provide a bleed
(4) See Facility Plate Nos. 030 through 033 for
typical installation. Provide liquid pumps as standbys for