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|  MIL-C-53057(ME)
diameter minus the tube minimum diameter shall be not greater
than 15 percent of the nominal tube diameter.
3.12 1.3 Pressure tube fittings. Unless otherwise specified herein
pressure tube fittings shall be 37 degree flared and straight thread
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fittings conforming to SAE J514 or 4 bolt split-flange type
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conforming to SAE J518. Jump size tees may be used. The 4 bolt
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split-flange type connections may terminate in either a flange head
that incorporates a SAE J518 plain mating face or a flange head that
integrally incorporates four boltholes and an O ring groove for
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mating to a SAE J518 port face. Pressure tube fittings that
incorporate the SAE J518 connection shall contain a boss into which
the tube shall be brazed or welded. Pressure tube fitting sizes shall
be limited to 1/4, 5/16, 3/8, 1/2, 5/8, 3/4, 1, 1 1/4, 1-1/2, and 2
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inch. Pressure tube fittings shall have a minimum burst pressure 3
times the maximum operating pressure.
3.12.1.4 Suction lines. A pump inlet suction line shall include
provision for flexibility when there is vibration or movement between
the reservoir and the pump. The suction line shall be sized so that
the pump inlet pressure does not drop below atmosphere by more than 5
inches of mercury vacuum at 140 F 10 F oil temperature and at
governed engine speed. The inlet suction line installation shall
include no stress concentration at the end fittings and no kinks.
Hose shall conform to SAE J517, SAE 100R4 or shall be oil resistant
hose. Suction hose clamps shall be stainless steel type in accordance
with SAE J536, Type F, Style 4 or saddle worm thread type with
stainless steel inner liner or a heavy duty T bolt clamp, or shall be
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in accordance with fittings specified in 3.12.1.1.
3.12.1.5 Return knee. Return lines shall be in accordance with SAE
J517.
3.12.2 Hydraulic pumps. The hydraulic pump(s) shall have been
tested in accordance with NFPA Recommended Standard T.3.9.18 1976.
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When tested in this manner, the contaminant tolerance profile for the
hydraulic pump(s) shall either:
a.
Not fall below or cross the B 0 curve of the hydraulic system
1
filter when tested in accordance with MIL F-52723 (see
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4.6.2.17.2).
or else
b.
The pump Omega rating shall be less than the filter Beta 10
rating.
3.12.3 System filtration. System filter(s) shall be furnished
either in the pressure line, return line, or combinations (as
specified in 3.12.3.1 or 3.12.3.2). Labels identifying each filter
shall be provided near the points of filter installation.
3.12.3.1 Return line filters. Although the system filter element
need not be qualified to MIL F-52723, it shall meet the performance
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