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|  4.6 Inspection methods. -
4.6.l Examination. - Each strainer submitted for acceptance snail be
carefully examined to determine conformance with the requirements of this
specification, including the contractors approved drawings and specifications
not covered by tests.
4.6.2 Bubble. - Strainer elements shall be subjected to the bubble test.
The element containing no oil, fuel, water or other liquid shall be installed
in a test set-up similar to figure 1. Fluid conforming to P-D-680 shall be
maintained at a level 1/2 inch above the top of the strainer element. Air
pressure within the element shall be maintained at the pressure specified in
the model specification as the element is slowly rotated through 360 degrees.
No bubbles shall form on the surface of the element at or below the air pressure
specified for the bubble test in the model specification.
4.6.3 Internal pressure, - Fluid under pressure of from 4 inches of
fluid to 5 psi in l-psi increments and from 10 percent of rated pressure to
rated pressure in 10 percent increments shall be applied to the inlet port
with the outlet port blocked. After a 3-minute waiting period at each
pressure, there shall be no external leakage.
4.6.4 Proof pressure. - With the outlet port blocked, the inlet port of
the strainer shall be subjected to a fluid proof pressure of 200 percent of
the rated pressure for a period of 2 minutes. There shall be no failure or
external leakage.
4.6.5 Internal suction. - Strainers shall be tested as follows. With
ports capped, the strainer shall be capable of maintaining a trapped internal
suction of 10 inches of mercury for 1 minute in air without evidence of
leakage or distortion.
4.6.6 Maximum diameter of bead passing through strainer element. - The
following test shall be performed in a test setup as shown on figure 2. The
test fluid shall be prefiltered through a 0.5-micron filter and the quantity
of fluid shall be 0.067 liters/gpm of-filter- element rated flow, " "
4.6.6.1 Test procedure. -
(a) A setup shall be made as shown on figure 2. The test filter shall be
complete with clean element, but with the bypass blocked in
closed position, The mixing chambers shall have a capacity
of 1.4 times the quantity of test fluid.
(b) With valve B closed, add the specified amount of previously
filtered test fluid, less the quantity required to make a
slurry with the contaminat, to the mixing tank through
plug valve A.
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