MIL-HDBK-1022A
i) Ensure all valves are UL listed or FM approved
for LPG service. At a minimum, use Class 300 valves.
j) Provide equipment to inject alcohol into the LPG
off-loading line. Provide equipment capable of injecting
alcohol at a rate of 1:800 alcohol to LPG by volume.
10.2.5.4 Pumps and Compressors. Design and install pumps and
compressors in accordance with API Std 2510 and NFPA 58.
10.2.5.5 Vaporizers. Provide vaporizing equipment for
distribution facilities as follows:
a) Provide vaporizers at locations where liquid
temperatures are too low to produce sufficient vapor pressure
to meet the maximum required flow rate.
b) Use vaporizers that are indirect fired-type
utilizing steam or hot water as a heating medium or direct
fire waterbath-type.
c) Size vaporizers to provide at least 125 percent
of expected peak load.
d) Design and install vaporizers in accordance with
NFPA 58.
e) Use waterbath vaporizers approved by Factory
Mutual.
f) Space waterbath vaporizers in accordance with FM
Section 7-55,12-28, except provide a minimum of 75 feet (23 m)
between truck off-load stations and tank storage. Where space
is limited, provide a blast wall at the truck off-load
stations.
g) When using waterbath vaporizers, provide fire-
safe fusible link shut-off valves in LPG supply piping at the
vaporizers. Provide remote shut-off capability and 24-hour
remote monitoring.
h) When using waterbath vaporizers, provide an
automatic excess flow/emergency shut-off valves in LPG supply
lines to vaporizers. Use a hydraulically operated diaphragm
control valve and locate at tank storage.
176
Previous Page
