MIL-HDBK-1022A
10.2.4.2 Number and Size of Bulk Tanks. Storage capacity
depends on requirements, frequency of deliveries, and
dependability of supply. Consider a multitank system for more
dependability.
10.2.4.3
Design requirements are as
follows:
a) Tanks and tank appurtenances require conformance
with NFPA 58 and API Std 2510. Design LPG tanks for a minimum
working pressure of 250 psig (1700 kPa).
b) Tank spacing requires conformance with
MIL-HDBK-1027/1 and FM criteria. See Facility Plate Nos. 032
and 033.
c) Provide sufficient flexibility in piping
connections to tanks to allow for differential settlement of
tank and equipment.
d) Provide cathodic protection in accordance with
Section 2 of this handbook.
e) If using compressor transfer systems, fit tanks
with dip pipes a minimum of 3/4 inches (20 mm) diameter, and
gas inlet lines from compressors, so that gas pumped into
storage tanks from empty delivery vessels is bubbled through
liquid LPG to prevent overpressuring tanks.
f) Provide float-actuated high-level alarms set at
maximum permissible filling level of 80 percent on all tanks
of 3,000 gallon (11 000 L) capacity and above.
g) If using installed transfer systems, provide
pressure switches on tanks set to open at pressures 5 psig (35
kPa) below set pressures of safety valves to stop compressor
pumps transferring LPG to tanks.
h) Ensure that tanks are ASME coded and have the
ASME national registration number.
i) Size storage tanks for 120 percent of required
storage volume.
j) Electrically ground all storage tanks.
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