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|  MIL-T-52843C
Throughout the bend, the tube maximum diameter shall be equal to
or greater than the tube nominal diameter, and the tube maximum
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
fittings conforming to SAE J514 or 4-bolt split-flange type
conforming to SAE J518. Jump size tees may be used. The 4-bolt split-
flange type connections may terminate in either a flange head that
incorporates a SAE J518 mating face or a flange head that integrally
incorporates four boltholes and an O-ring groove for mating to a SAE
J518 port face. Pressure tube fittings that incorporate the J518
connection shall contain a box 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 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 he sized so that
the pump inlet pressure does not drop below atmosphere by more than 7
inches of mercury vacuum at 120 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, 100R4 or shall be oil resistant hose.
Suction hose clamps shall be of the double wrap stainless steel type
in accordance with SAE J536, type F, style 4 or of the saddle worn
thread type with stainless steel inner lining or of the heavy duty T-
bolt clamp type or shall be in accordance with fittings specified in
3.12.1.1.
3.12.1.5 Quick-disconnect couplings. Quick-disconnect hydraulic
couplers shall be used in hydraulic line where separation is made for
transportability requirements (see 3.1.3.2) and they shall perform as
specified herein. The hydraulic couplings shall connect to lines
equal to or smaller than 1 inch with straight thread fittings
conforming to SAE J514 and to lines larger than 1 inch with the SAE
J518, 4-bolt, split flange face fittings. The coupler halves shall be
restrained to prevent contact with the ground or any surface of the
boom when connected and when disconnected. The coupler halves shall
be identified with metal identification plates, metal tags metal
,
bands or by color coded anodized aluminum fittings to assure assembly
of correct mating halves. Each coupler half shall be provided with a
captive chained cap to protect the opening when the coupler is
disconnected. The caps of the mating coupler halves shall fit
together when not in use to prevent corrosion, damage, and
contamination of the mating surfaces. The hydraulic coupler shall not
have any partially coupled unlocked positions in which the couplings
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