MIL-PRF-13789E
TABLE I. Plate perforation size code.
Plate perforation size in
Code for plate
inches (mesh)
perforation
0.0045 (130 mesh)
A
0.0070 (80 mesh)
B
0.0157 (40 mesh)
C
0.031 (20 mesh)
D
0.062 (10 mesh)
E
0.125
F
0.187
G
0.250
H
0.375
J
3.3.1.2 Size. The nominal inside diameter strainer size will be expressed in four significant
figures, XX.XX (100ths of an inch) increments. For example 0125 is 1.25-inch nominal inside
diameter; 1200 is 12.00-inch nominal inside diameter.
3.3.1.3 Drain port. A port, with plug, shall be required at the strainer body low point to
provide for draining of residual fluid.
3.3.1.4 Threads. All screw-type threads shall conform to ASME B1.20.1.
3.3.1.5 Thread compound. Port and plug threads shall be coated with a gasket-forming
compound capable of resisting fuel or water degradation.
3.3.2 Strainer basket. The strainer basket shall be single-or double-walled and shall be
removable from the strainer body without the use of special tools.
3.3.2.1 Screen. The strainer basket screen shall be made from bronze, brass, corrosion
resistant steel, monel wire, or other suitable corrosion resistant, fuel and oil compatible, material.
3.3.2.2 Open area. The open area of the strainer basket screen shall be greater than
30 percent of the screen total area. The net open area shall be greater than 300 percent of the
cross-sectional area of the inlet opening.
3.3.3 Inlet and outlet connections. Inlet and outlet connections shall be on a common axis
passing through the strainer body.
3.3.3.1 Threaded. All screw-type threaded connections shall be internal National Pipe Thread
(NPT) in accordance with ASME B1.20.1.
3.3.3.2 Flanged. All flanged connections, gaskets, bolts, and nuts shall be in accordance with
ASME B16.1 or ASME B16.5, ASME B16.21, ASME B18.2.1, and ASME B18.2.2,
respectfully.
3
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