TM 5-810-15
with nitrogen when it is to be out of service for an
steel piping or tubing for interconnection of system
extended period. The system consists of nitrogen
components and the DA storage tank.
p. Samples. The samples system collects samples
bottles, manifold, and interconnecting piping. The
coal bunker and pulverizer inerting system is used
from various points in the plant for use in
to fill coal bunkers and pulverizers with an inert
determining chemical feed requirements based on
gas, usually 002 when fires are detected in the
water quality. Sample points will include boiler
equipment or when the equipment is to be out of
drum, feedwater, and condensate. The system con-
service for an extended period. The system consists
sists of sample coolers (boiler drum) and tubing
of gas bottles, manifold, and interconnecting pip-
from the sample point to a central location when
ing.
desired.
n. Ignitor fuel. The ignitor fuel system provides
fuel for burner ignitors. Ignitors are used on gas,
8-3. Valves.
oil, pulverized coal, and ACFB boilers. The ignition
a. General. All valves installed in piping systems
fuel may be oil, natural gas or liquified petroleum
must be suitable for the pressure and temperature
gas based on the type of ignitors used. The system
of the piping system in which they are installed.
consists of pressure regulating stations and
Valves will be selected based on type of service
interconnecting piping.
(throttling or isolation), type of process fluid
o. Chemical feed. The chemical feed system sup-
(water, steam, air), and special conditions
plies chemicals to the feedwater system at the DA
(corrosive or abrasive process). Consideration must
storage tank to maintain water quality. The system
be given to materials of construction and packing
consists of chemical feed tanks for mixing and
materials. Table 8-2 summarizes the types of valves
storage of chemical solutions; positive displacement
and their application.
metering type chemical feed pumps; and stainless
8-5
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