NOTE: Static pressures are always required. If the
system has no pollution control device, static
pressure measurements are only required at the fan
inlet and outlet. This is also true for the
replacement air fans. To properly evaluate the
system, differential pressures are needed across the
fan and each air pollution control device. Look at
each system and determine the appropriate test
points.
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Take static pressure readings using a pitot tube and manometer.
The
following readings are required:
a.
Hood static pressure. Take readings at a distance of one duct
diameter from tapered hoods, and 3 diameters from plain or flanged
hoods;
b.
Replacement and exhaust fan inlet and outlet static pressure;
c.
Room static pressure as compared to [outdoors] [outside the area
controlled by industrial ventilation];
[d.
Air cleaning device inlet and outlet static pressure; and]
[e.
Branch static pressure in the replacement and exhaust air system
submain ductwork.]
Verify test instrument readings correspond with attached static pressure
gages
3.2.2.5
Control System Check-Out
Test warning system controls for the industrial ventilation system
including the following:
a.
Above and below range alarms for room static pressure.
b.
Fan motor operating lights.
[c.
Dampers operated by the control motor.]
[d.
Hood static pressure.]
[e.
Dislodged or ripped filtration equipment.]
[f.
Overloaded air cleaning device.]
3.2.2.6
Other Readings
Take the following readings on each day testing is performed:
a.
Temperature readings after the system has stabilized and has been
running for at least 4 hours:
(1) Wet bulb and dry bulb temperature of ancillary rooms,
workspaces, replacement air, outside air, [return air,] [and]
[mixed air].
SECTION 15951N
Page 31
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