3.2.6.1
Leak Tests, Low Pressure Systems
Less than 4136 kPa (gage) 600 psig. Test each section of each system at
1034 to 1379 kPa (gage) 150 to 200 psig with oil-free dry nitrogen. When
design pressure is greater than 1379 kPa (gage) 200 psig, pressurize each
section in 350 kPa (gage) 50 psig increment until the design pressure is
reached.
3.2.6.2
Leak Tests, High Pressure Systems
4136 - 20,682 kPa (gage)600 - 3000 psig. Before attaching service outlets,
couplers or other equipment, pressurize each section in 1300 kPa (gage) 200
psig increments with oil-free dry nitrogen until the design pressure is
reached. Leak test joints with soap solution at each 1300 kPa (gage) 200
psig increment.
3.2.6.3
Equipment Pressure Tests
Test joints with the system at 1034 kPa (gage) 150 psig with the equipment
connected limited to the rough-in portion of service outlets. Do not
connect equipment until after the test is completed. Carefully wipe off
soapsuds and seal openings against contamination until tanks or equipment
are connected.
3.2.6.4
Final Pressure Tests, Low Pressure Systems
Pressure test with nitrogen at 120 percent of design pressure for 24 hours.
No pressure drop, except due to temperature change, will be accepted.
Allow for ambient temperature change in accordance with the relationship PF
+ 101.32 = (P1 + 101.32) (T2 + 273) (T1 + 273) PF + 14.7 = (P1 + 14.7) (T2
+ 460)/(T1 + 460), in which T and P represent Centigrade Fahrenheit
temperature and gage pressure respectively, numbers 1 and 2 denote initial
and final readings respectively, and PF is the calculated final pressure.
When PF exceeds the measured final pressure, retest each section
individually, and apply soap solution to all joints of each section for
which a reduction in pressure occurs after allowing for ambient temperature
change. Repair leaking joints and repeat test until no reduction in
pressure occurs. Use a test gage calibrated in 2 kPa one psi increments
and readable to one kPa (gage) 1/2 psig.
3.2.6.5
Final Pressure Tests, High Pressure Systems
Pressurize system with nitrogen in 1300 kPa (gage) 200 psigincrements.
Hold design pressure for 24 hours. No pressure drop, except due to
temperature change, will be accepted. Allow for ambient temperature change
in accordance with the relationship PF + 101.32 = (P1 + 101.32) (T2 =
273)/(T1 + 273) PF + 14.7 = (P1 + 14.7) (T2 + 460)/(T1 + 460), in which T
and P represent Centigrade Fahrenheit temperature and gage pressure
respectively, numbers 1 and 2 denote initial and final readings
respectively, and PF is the calculated final pressure. When PF exceeds the
measured final pressure, retest each section individually, and apply soap
solution to all joints of each section for which a reduction in pressure
occurs after allowing for ambient temperature change. Repair leaking
joints and repeat test until no reduction in pressure occurs. Use a test
gage calibrated in 350 kPa (gage) 50 psig increments and readable to 175
kPa (gage) 25 psig in performing the tests.
SECTION 15217N
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