Water Handling Equipment Guide - National Wildfire Coordinating ...

APPENDIXES
I—Definitions
Uniform leakage—The wetting and close up
period of a dry unlined hose.
Unlined hose—A woven hose that does not
incorporate a tube. Designed to seep, and
manufactured of linen yarn. Normally used as
emergency hose, but used in wildland fires due to
its resistance to hot spots that would burn through
other types of hose.
USDA Qualification—The purpose of the
qualification process is to determine if a
manufacturer's product conforms to USDA Forest
Service specifications. For example, the
qualification of pumps includes a visual inspection,
a priming test, a drafting test, an engine test, an
endurance performance test, a spark arrester test,
and a sound test. Testing and evaluation is
conducted by the government at the expense of the
contractor. Once a product is determined to meet
the minimum specification requirements, the
product is assigned a Qualified Products List (QPL)
number and is added to the QPL. The QPL is a
USDA Forest Service list of products that have
been examined, tested, and have satisfied all
applicable qualification requirements and may be
used by any interested party.
Working pressure—The maximum "operating
pressure" of a component or system. Identified as
"WP" on Forest Service-qualified fire hose. Also
known as "rated pressure."
Y
arn number (cotton)—A conventional relative
measure of fineness as applied to yarns.
Coarse yarns have low numbers and fine yarns
have high numbers.
Warp—The amount of deviation from a straight
line when the hose is hydrostatically tested;
usually expressed in inches.
Water extraction—The pH content of a hose
jacket determined after boiling in distilled water in a
laboratory test.
Water hammer—The series of shocks, sounding
like hammer blows, produced by suddenly reducing
the flow of a fluid in a pipe or hose such as when a
valve is rapidly closed.
Wetting agent—Detergent type chemical that
when added to water reduces surface tension and
increases penetration into fuels.
Wet water—Water treated with wetting agent.
Wheel base —Distance from centerlines of front
axle to rear axle of a motor-driven vehicle or center
of tandem axles
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