counter of [dial and pointer type] [cyclometer type].
Stuffing
box shall not be allowed.
3.
Materials of construction shall be [cast iron body with 113 kg
250 pounds flanged ends for pressures up to 1724 kPa 250 psig and
temperatures up to 232 degrees C 450 degrees F] [cast steel body
with 136 kg 300 pounds flanged ends for pressures up to 2070 kPa
300 psig and temperatures up to 400 degrees C 750 degrees F].
Wear parts shall be of monel or stainless steel with graphite top
bearing and jewelled bottom bearing.
4.
Meter shall be direct reading in pounds of steam over a 10 to
1 range, with continuous overload capability up to 150 percent of
rated capacity and temporary overload capability up to 200 percent
of rated capacity.
5.
Accuracy shall be within plus or minus 2 percent of actual
flow over the entire 10 to 1 range at flow rates and pressures
within the limits set forth in the capacity tables.
[6.
Meter shall be equipped with pressure compensating counter
for automatically and continuously correcting meter readings to
compensate for line pressure variations. The counter shall be
self-contained and self-operating and require no connections other
than a single tap to the steam main. Pressure compensation range
shall be [_____] to [_____] kPa psi.]
[7. Meter counter shall be equipped with electric contactor to
operate a remote totalizer, or for providing impulses for
interfacing with an energy monitoring system. Contacts or
impulses to be proportional to pressure compensated steam flow.]]
[b.
Variable Orifice Steam Meters
1.
Provide spring loaded variable orifice principle type steam
meters, density compensated, to ensure accuracy within plus or
minus 2 percent of actual flow rate independent of line pressure
changes.
2.
Provide a computer to display totalized flow, flow rate,
temperature, pressure, time, and date.
3.
The computer shall be capable of providing high and low flow
rate and temperature alarm set points, four independent timers to
store peak flow rate and total flow, a 4 to 20 mA output and a
communication port for energy management interface.]
2.2.11.2
Air Traps
FS WW-T-696 for float-operated steam traps (non-thermostatic), except that
the valve mechanism shall be inverted so as to be closed, not opened, by
rising water. Arrange float-controlled valves to close promptly when water
enters the traps. Locate traps as indicated.
2.2.11.3
Steam Traps
**************************************************************************
NOTE: Consult reference document to determine Type,
Class, and Style as appropriate for the project.
SECTION 15183N
Page 21
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