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GLOSSARY
Firewall.
See Berm
Fittings.
Miscellaneous items of piping such as elbows, tees, couplings, nipples, etc.
Flame Arrester.
An assembly of perforated plates or screens enclosed in a case and attached to the breather vent on a
petroleum storage tank. The device prevents a flame from entering the tank through the vent.
Friction Loss.
Loss of pressure, in terms of feet of head or psi per unit of pipe length, from internal resistance to flow
in the product itself (viscosity) and from resistance offered by pipe walls, pipe fittings, and reductions in pipe
diameter.
Fuel Test.
A method used to test a pipeline or terminal when a water or air test is not possible or desirable. The lines
are tested section it a time at the system operating pressure. Extreme caution must be used due to the fire hazard
associated with this test method.
-g-
Gage Pressure (psia).
The pressure as shown by a pressure-registering instrument (gage). The gage pressure, in
pounds per square inch, is approximately equal to the absolute pressure minus 14.7.
Gasket.
The sealing element of a flange, coupling, or other mating surface designed to hold liquid or gas.
Gasoline (Mogas).
A hydrocarbon fuel in the approximate composition range CsH12 to C9H20 for use in internal
combustion engines and procured by the military Under three specifications. Federal specification VV-G-76
provides for two grades (regular and premium) and for three classes (A, 8, and C). Another specification for
leaded and unleaded gasoline is VV-G-001690. Specification MIL-G-3056 specifies combat grade types I and II.
Gate Valve.A valve in which a disk or wedge is raised to permit flow and lowered to stop flow.
Gravity.
See Specific Gravity Grounding. Electrically connecting single or bonded units to a ground rod so that any
static potential that might exist or that might be generated will be discharged into the earth. If two or more units are
bonded and one is grounded, the whole system is effectively grounded. (See Bonding.)
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Glossary 4
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