Quantcast Combustible Liquids Under Pressure

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MIL-HDBK-1008B
a)  Aboveground vertical tanks with floating pan roofs less than
126 feet in diameter shall be provided with an extinguishing system consisting
of the necessary foam chambers, piping, valves, and controls to be supported
by fire department crash and structural apparatus.  Location of fire
department connections should be coordinated with the local fire chief.
b)  Larger diameter tanks (>126 feet) shall be protected by a
complete and independent AFFF fire protection system designed and constructed
in accordance with NFPA 11, Low Expansion Foam and Combined Agent Systems.
4.14.3
Combustible Liquids Under Pressure.  Any combustible liquid under
pressure shall be treated as a flammable liquid when such liquids are located
in pump houses and hydraulic test facilities.  For pump houses for Navy
facilities, refer to NAVFAC DM-22.  For pump houses on Army projects, refer to
the appropriate NFPA standards.  For hydraulic test systems, comply with the
following:
a)  For hydraulic systems that use pressures exceeding 200 psi
(1379.5 Kpa), SAE 1,010 dead-soft, cold-drawn, seamless-steel tubing (or
equivalent) shall be used.  A factor of safety of eight over normal working
pressure shall be used.  Tubing is preferable to pipe.  Tubing can be bent to
fit in restricted spaces with a minimum number of fittings, reducing the
number of possible leakage points.  Solderless, steel fittings of the
flareless "locking-sleeve" type or flare type shall be used.
b)  Use of threaded pipe should be avoided.  Where threaded
connections are used, requirements of ANSI B2.1 shall be met.  A safety factor
of eight over maximum normal pressure shall be used.
c)  Tubing runs shall have as few bends as possible, but should
have at least one bend to provide for thermal expansion and contraction.  The
minimum radius of tube bend shall be three tube diameters.
d)  Where hose must be used for flexible connections, it shall be
steel reinforced, designed for the hydraulic fluid being used, and capable of
withstanding five times the actual operating pressure.  Hose couplings and
fittings and minimum bending radius shall be in accordance with the hose
manufacturer's instructions.  Hose shall be installed so as not to rub against
objects as a result of machine movement, vibration, or pressure surges.
e)  Piping and tubing shall be anchored or secured to minimize
failure due to vibration.  Pipe supports shall not prevent normal thermal
expansion.
f)  There shall be an accessible, well-marked, emergency shutoff
switch for each pump.
g)  Provide automatic shutoff switch to deactivate hydraulic pump
upon loss of pressure.
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