3.6.6.14
Testing of Piping Systems
a.
General: Contractor shall submit a written schedule 7 days in
advance of test to Contracting Officer for approval.
b.
Piping shall be hydrostatically tested before piping insulation is
shall not be less than 1.5 times the design pressure, but shall
not exceed the maximum allowable test pressure of nonisolated
components.
c.
Underground lines in pressure service shall be tested prior to
backfilling, as specified, with pressure to be maintained for 12
hours without drop. Accessories required for test shall be
furnished by Contractor.
d.
Contracting Officer may exercise option to have Contractor perform
air pressure and soap solution test. If this type of test is
approved by Contracting Officer, Contractor shall perform air
pressure and soap solution test at weld and flange joints.
Pneumatic test pressure shall not be less than 1.2 nor more than
1.5 times the design pressure of piping system. The test pressure
shall not exceed maximum allowable test pressure of non-isolated
components. Leaks discovered during test shall be corrected and
successive tests performed. Test shall be repeated until leaks
are sealed. Test shall be conducted before insulation is applied.
A portable sprayer shall be used to spray soap solution on joints
provided as required to pressurize system prior to and during
tests. Tests shall be in accordance with ASME B31.1.
3.6.7
Cleaning of Boiler and Piping
After hydrostatic tests have been made, and prior to performance of
operating tests, boiler shall be thoroughly and effectively cleaned of
foreign materials by mechanical cleaning, initial chemical cleaning, a
chemical boiling period and finally by operating steam system at 100
percent (100%) makeup water and wasting the condensate. Wherever possible,
water contacted surfaces shall be wire brushed to remove loose material,
following which, boiler shall be filled with solution consisting of
following proportional ingredients and circulated at approximately 207 to
344 kPa 30 to 50 psig for period of 24 to 48 hours:
10.9 kgs 24 lbs caustic soda.
10.9 kgs 24 lbs disodium phosphate, anhydrous.
3.6 kgs 8 lbs sodium nitrate.
0.23 kgs 1/2 lb approved wetting agent.
3,785 Liters 1,000 gallons water.
Chemicals in proportions above, or as approved by Contracting Officer,
shall be thoroughly dissolved in water before being placed in boiler.
After this initial chemical cleaning, boiler shall be drained and refilled
with the above chemical solution and boiled per the manufacturer's
SECTION 15561A
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