equipment such as pumps and filter-separators from the FRP piping system
during the test. Prior to starting any pneumatic testing of buried FRP
pipe, portions of the pipe between all joints must be backfilled in place
as described in Section 02300 EARTHWORK to at least 610 mm 24 inches over
the top of the pipe as a safety measure.
3.6.3.2
Second Pneumatic Tests
**************************************************************************
NOTE: The second pneumatic test applies only to
piping supplying fuel to an aircraft or truck direct
fueling station. This provides additional leak free
assurance before fuel is added to pipelines.
**************************************************************************
Increase pneumatic pressure on all FRP pipe and fittings for aviation fuel
dispensing systems to 345 kPa (gage) 50 psig. Hold pressure for at least 4
hours without a drop in pressure. An allowance of 35 kPa 5 psi may be made
for gage error and thermal expansion and contraction. To reduce effects of
solar load, begin testing near sundown or provide shade for exposed piping.
During 4 hour pressure holding period, valve off system and disconnect
method of system pressurization. Rely only on gage pressure for leak
detection and provide signs warning personnel to stay clear of trenches
during testing.
3.6.3.3
Hydrostatically pressure test all FRP pipe and fittings and all FRP pipe to
metal fittings using potable water to 1 1/2 times the maximum operating
pressure or 1551 kPa (gage) 225 psig whichever is greater for a period of 4
hours prior to placement of sand bedding and backfill, except as required
by paragraph entitled "Initial Pneumatic Test." The operating pressure
shall be the sum of the static head pressure, pressure required to overcome
friction losses, and any required back pressure. Provide controls and
protective equipment so that the level of pressure rise above operating
pressure due to surges and other variations from normal operation shall not
exceed the test pressure at any point in the piping system. Limit pressure
rise to 11.50 kPa per second 100 psi per minute at beginning of test and
pressure drop to 11.50 kPa per second 100 psi per minute at conclusion of
test. Air or vapor at all high points in the system must be replaced by
the test fluid before testing. Pressure must hold for a minimum of 4 hours
with a 27.50 kPa 4 psi maximum drop. After 4 hours at test pressure and
with pressure still applied, visually inspect all pipe, fittings, and
joints for indications of weeping or leaking. Repair any weeping or
leaking condition discovered in accordance with paragraph entitled "Field
Repairs of Pipe and Joints." During 4 hour pressure holding period, valve
off system and disconnect method of pressurization.
3.6.3.4
Hydrostatic Cycle Test
Pressure cycle test system at 1896 kPa (gage) 275 psig or 1 1/2 times the
maximum operating pressure, whichever is greater, for 10 cycles. Each
cycle shall consist of a one-minute period at 1896 kPa (gage) 275 psig or 1
1/2 times the maximum operating pressure and a 4 minute period when the
pressure is dropped at least 40 percent. Examine system for leaks and
porosity, repair in accordance with paragraph entitled "Field Repairs of
Pipe and Joints," and repeat test until system is proven tight. After
successful completion of hydrostatic test series, cast concrete thrust
blocks around FRP pipe in accordance with paragraph entitled "Thrust
SECTION 15191N
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