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Flow meters for boiler feedwater measurement shall be Differential Pressure
Type, Venturi Style. Venturi flow tubes shall be pound-rated with a series
of nozzles around the inner surface to sense and average the velocity head.
Tubes 150 mm 6 inches and larger shall be flanged and smaller tubes shall
be installed between welded neck flanges. Smaller flow tubes shall be
corrosion-resistant steel and flanged tubes shall have corrosion-resistant
steel throat inserts. Metering shall be for water flow [and feedwater
temperature]. The receiver for each boiler shall be mounted on the boiler
instrument panel. Equipment shall be complete with differential pressure
transmitter, shutoff valves, equalizing valves, and blowdown valves as
required for a complete installation.
2.9.13.1
Indicating Feedwater Meter Receivers
Meter receivers shall match other panel components in appearance and shall
indicate water flow in [_____]. Where indicating feedwater meter only is
utilized, a companion indicating feedwater temperature receiver shall be
provided.
2.9.13.2
Indicating, Recording, and Integrating Receivers
Meter receivers shall be indicating, recording, [and integrating] furnished
in a dust-tight metallic or plastic case finished in manufacturer's
standard black finish and arranged for flush panel mounting. The indicator
shall show with a pointer the rate of water flow. The record of flow, in
thousands of kg pounds per hour, shall be made in ink on a 24 hour, 300 mm
12 inch diameter, equally graduated circular chart driven by an electric
clock mechanism. Sufficient blank charts and ink shall be provided for 400
days of operation. Meter shall also record boiler feedwater temperature in
degrees C and degrees F degrees F on the same chart. [Water shall be
totalized in kg pounds by an integrator having not less than a six-digit
counter.]
2.9.14
Blowoff Sample Cooler
Sample cooler shall be a water-cooled, shell-and-tube or shell-and-coil
type heat exchanger with stainless steel tubes and cast-iron or steel shell
suitable for cooling the blowoff before sampling. Cooler shall be
connected to a header and valved so the operator can obtain a sample of
properly cooled blowoff from any boiler as desired. Cooler shall be
properly supported and shall have a brass or bronze sampling cock with
lever or compression handle. A sampling glass container suitable for
handling the water temperature to be encountered and a hydrometer or
equivalent device suitable for measuring the concentration of solids in the
water and reading in parts per million shall be provided.
2.9.15
Temperature Indicators
The Contractor may install any of the following temperature measuring
devices as indicated. Gauges shall match pressure gauges in appearance and
shall match requirements of the transmitters supplied. Remote temperature
indicators shall include condensate and steam temperature.
2.9.15.1
Thermometers
Thermometers shall conform to ASME PTC 19.3, Type 1, Class 3, dial with
wells and separable corrosion-resistant steel sockets, and temperature
SECTION 15846A
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