jacket for the vertical lines shall be placed on the off-weather side of
the pipe. On vertical lines, the circumferential seams of the jacket shall
overlap so that the lower edge of each jacket overlaps the upper edge of
the jacket below. Vertical exhaust piping shall be provided with a hinged,
gravity-operated, self-closing rain cover. When the exhaust pipe exits the
building, the pipe should be isolated from the [wall][roof] by means of
thimbles in accordance with NFPA 37.
2.9
PYROMETER
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NOTE: For engines smaller than 1,000 kW (1,340 hp)
delete this paragraph. Pyrometers with individual
thermocouples are not normally available and should
not be specified for engines smaller than 1000 kW
(1,340 hp).
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[A pyrometer [multi-point selector with individual thermocouples] [and
thermocouple] with calibrated leads shall be provided to indicate the
temperature [in each engine cylinder and the combined exhaust] [in the
combined exhaust]. For a supercharged engine, additional points,
thermocouples and leads shall be provided to show the temperature in the
turbocharger exhaust gas outlet and combustion air discharge passages. The
selector switch shall be double pole, with an off position, one set of
points for each thermocouple, and a suitable indicating dial. The
pyrometer, thermocouple, leads, and compensating devices shall be
calibrated to show true exhaust temperature within 1 percent above the
highest temperature encountered at 110 percent load conditions.]
2.10
EMISSIONS
The finished installation shall comply with Federal and local regulations
and restrictions regarding the limits of emissions such as [CO, HC, and
NOx] [carbon monoxide, hydrocarbon, and nitros].
2.11
STARTING SYSTEM
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NOTE: The engine can be started by either pneumatic
(compressed air) or an electric starting system.
The selection of the starting system should be based
on costs and availability of compressed air or
electric power. The starting system should be of
adequate capacity to start the engine under the
coldest conditions encountered. Generally, in
pumping plants with an existing station air system
or where a station air system will be installed, a
pneumatic system will have the lowest initial cost.
The designer should ensure that the requirements for
the station air system include an air receiver of
adequate size to accommodate the cranking cycle of
each engine in the station without recharge by the
station air compressor. Paragraph 2.11.1 ALTERNATE
1 should be deleted when a pneumatic starting system
is specified. ALTERNATE 2 of this paragraph should
be deleted when an electric start system is
specified.
SECTION 15133A
Page 30
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