2.19.4
Air Blower Tests
The air blower shall be subjected to the following tests at the factory by
the manufacturer: (1) The casing shall pass a hydrostatic pressure test
at a minimum gage pressure of 112 kPa 25 psig; (2) The impeller, before
being mounted on the shaft, shall pass an over-speed spin test to a
rotational speed of 120 percent of design speed; (3) After the spin test,
the impeller shall pass an inspection for weld or other structural
imperfections using magnetic particle techniques or x-rays; (4) The blower
shall be given a running test using manufacturer's driver. During this
test, mechanical operation of all equipment shall be satisfactory.
Vibration shall meet the limits specified herein, and the overall sound
pressure level shall be determined, making due allowance for any background
noise during the running of the tests; (5) The blower shall be tested in
accordance with ASME PTC 9 using manufacturer's driver and the temperature
rise method of determining wattage horsepower. Tests shall include
determination of the surge point and the shape of the characteristic curves
at various inlet guide vane positions, and the determination of all data
required to evaluate efficiencies and wattage horsepower requirements for
the specified conditions. At least ten days prior to the manufacturer's
running tests (4) and (5) above, the Contractor shall notify the
Contracting Officer when these tests are to be performed so that
arrangements can be made for a representative of the Government to witness
the tests.
2.19.5
Operation Tests for Electrical Control Panel
The electrical control panel shall be rigidly shop tested for compliance
with all applicable drawings and specifications. The test shall include
energizing all circuits and performing the operating sequence, simulating
field operations.
PART 3
EXECUTION
3.1
DESIGN
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NOTE: Insert value for design flow. On the project
drawings, show:
1. Type of plant: (Extended aeration, Step
Aeration, or Complete Mixing).
2.
Design flow.
3.
5-day BOD loading.
4.
Suspended solids loading.
5. Whether a comminutor is needed for plants 1.09
L/s 25,000 GPD or less in size.
6.
Whether mechanical aerator should be allowed.
7. Whether plant should be concrete only, steel
only, or either concrete or steel at Contractor's
option.
SECTION 11375N
Page 94
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