2.11.6
Factory Tests
Perform manufacturer's standard factory tests on mechanical draft equipment
and material. Perform tests required by the applicable codes and these
specifications. Notify the Contracting Officer in writing at least 45 days
prior to factory tests so that he may have a representative witness the
tests.
2.11.6.1
Damper Tests
Perform factory tests on dampers, except poppet dampers. Each damper which
is provided with an integral frame shall be operated five times to test for
smooth and trouble-free operation, at both ambient and design pressures.
Each damper will then be checked to assure that no damage has been
sustained to the frame, blades, or seals. Each damper which is provided
with an integral frame shall be tested in an airtight chamber at design
temperature and pressure to determine the amount of gas leakage across the
damper and through the frame. Provide instruments to determine the amount
of leakage and the static pressure against the damper. Each damper
equipped with a seal system shall be tested for air leakage across the
damper with the seal air system operating at design temperature and at the
design differential pressure across the damper. Each seal air unit shall
be tested to assure that design flow, temperature and pressures are being
met. These tests shall be run independently from the damper tests, and
prior to the damper tests.
2.11.6.2
Mechanical Draft Equipment Tests
**************************************************************************
NOTE: Overspeed test is as follows. If the
operating temperature of the fan is less than 93
degrees C 200 degrees F, the wheel shall be Spun at
10 percent above the maximum operating speed for a
period of not less than three minutes. If the
operating temperature of the fan is 93 degrees C 200
degrees F or more, the wheel shall be spun for a
period of not less than three minutes at the speed
calculated from the following formula.
Test speed = 1.10 (max oper spd)
(allowable stress @ 38 C)
______________________________
(allowable stress @ oper temp)
Test speed = 1.10 (max oper spd)
(allowable stress @ 100 F)
______________________________
(allowable stress @ oper temp)
There shall be no permanent deformation of any part
of the wheel as a result of overspeeding. After the
test, welds shall be examined for cracks by magnetic
particle testing or dye check.
**************************************************************************
Perform manufacturer's standard factory tests on mechanical draft equipment
and material. Perform tests required by the applicable codes and these
specifications. Fan wheels with tip speeds exceeding 127 meter per second
25,000 feet per minute, and which are not identical to fan wheels in
successful commercial operation, shall be given an overspeed test. Factory
SECTION 15864N
Page 79
Previous Page
