Remove or isolate from the system the compressor, air dryer, filters,
instruments, and equipment which would be damaged by water during
hydrostatic tests and reinstall after successful completion of tests.
b.
Performance of Hydrostatic Tests
**************************************************************************
NOTE: Specify or show on the drawings the design
working pressure of each system in the project.
**************************************************************************
Hydrostatically test piping systems in accordance with ASME B31.1. Vent or
flush air from the piping system. Pressurize system for 10 minutes with
water at one and one-half times design working pressure, then reduce to
design working pressure and check for leaks and weeps.
c.
Compressed Air Leak Tightness Test
After satisfactory completion of hydrostatic pressure test, blow systems
dry with clean, oil-free compressed air, and test with clean, dry air at
design working pressure. Brush joints with soapy water solution to check
for leaks. Install a calibrated test pressure gage in piping system to
observe any loss in pressure. Maintain required test pressure for a
sufficient length of time to enable an inspection of joints and connections.
d.
Compressed Air Pressure Test For High Pressure Systems
For high pressure systems, compressed air at system design pressure shall
then stand in a system to equalize temperature. Pressure drop, corrected
for temperature change, shall not be more than one percent in 24 hours for
a test pressure 6894 kPa (gage) 1000 psig and above, and not over 5 percent
in 6 hours for test pressures from 2758 to 6894 kPa (gage) 400 to 1000 psig.
Use formula below to correct pressure for temperature change.
PF + 101.32
=
(PI + 101.32)(TF + 273)/(TI + 273)
PF + 14.7
=
(PI + 14.7)(TF + 460)/(TI + 460)
Where PF
=
Final Pressure, (kPa (gage)) (psig)
PI
=
Initial Pressure, (kPa (gage)) (psig)
TF
=
Final Temperature, (degrees C F)
TI
=
Initial Temperature (degrees C F)
3.4.2.3
Test equipment as in service to determine compliance with contract
requirements and warranty. During the tests, test equipment under every
condition of operation. Test safety controls to demonstrate performance of
their required function. Completely test system for compliance with
specifications.
3.5
INSTRUCTION TO GOVERNMENT PERSONNEL
Provide [2] [_____] man-days of instruction to [2] [_____] Government
personnel in accordance with Section 15050N BASIC MECHANICAL MATERIALS AND
METHODS for each type of compressor and compressed air dryer in the project.
SECTION 15212N
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