thickness of 6.35 mm 0.25 inch. Heads shall be ASME torospherical
type constructed of ASTM A 516/A 516M GR 70 carbon steel with a
minimum thickness of 6.35 mm 0.25 inches.
b.
Surge tank section shall have [_____] minutes of storage and shall
have a capacity of [_____] liters gallons flooded. A 280 by 380
mm 11 by 15 inch elliptical manhole shall be provided for access.
ASME stamp is not required for the surge tank.
c.
Surge tank shall receive returning condensate and be supplemented
by makeup by water to maintain desired operating level. Surge
tank shall be vented to the atmosphere. Collected water shall be
transferred to deaerator. Main deaerating portion shall be
located in deaerator storage tank and shall consist of water
collector and steam atomizing valve. Built into a flange on top
of deaerator storage tank is a spring loaded water spray nozzle
which includes an automatic and manual vent valve.
d.
Deaerator and surge tank support shall be of appropriate height to
meet the NPSH requirements of the transfer pumps and feedwater
pump/motor set.
e.
Height of deaerator support shall not exceed 1220 mm 48 inches.
2.7.1.6
Chemical Feed Quill
Chemical feed quill shall be located beneath the normal tank water level.
Chemical feed quill material shall be stainless steel. Chemical feed quill
shall provide even distribution and bleeding of chemicals.
2.7.2
Boiler Feed Pump
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NOTE: Pump manufacturers should be consulted
regarding specific features of construction for a
particular application. In general, for lower
pressure and flow applications vertical in-line
pumps with stainless steel shafts and impellers can
be applied. Cast iron or cast steel casings could
also be used for these applications. Horizontally
split pump casing specifications should require
nozzles on the suction and discharge and feet on the
lower half of the casing so the top half of the
casing can be removed without disturbing the main
piping. Designer is required to determine the upper
temperature limit for pumps based on the project
requirements. Delete design conditions if pump
schedule is shown on the drawings.
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For installations including more than one boiler feed pump, each boiler
feed pump shall be identical [_____] liter per hour gpm, [vertical in-line]
[horizontally split case, multi-volute or diffuser], centrifugal,
self-contained, multistage pump. The nomenclature used in these
specifications pertaining to pumps and hydraulic conditions is as used by
the Hydraulic Institute Standards for Centrifugal, Rotary and Reciprocating
Pumps.
SECTION 15561A
Page 76
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