MIL-PRF-24758A(SH)
4.5 Flexible conduit and fitting size. To determine conformance with the flexible conduit and fitting size
requirement of 3.5, each representative sample of flexible conduit and end fitting shall be measured for minimum ID
and maximum OD as specified in 4.5.1 and 4.5.2.
Flexible conduit size. To determine conformance with the flexible conduit minimum ID requirement
4.5.1
of 3.5.1, each representative sample of conduit shall be gauge checked as specified in IEC 60614-2-5, and Table I.
The appropriate ID gauge shall pass through the conduit under its own weight and without any initial speed. To
determine conformance with the flexible conduit maximum OD requirement of 3.5.1, each representative sample of
conduit shall be checked as specified in IEC 60423, and Table I. The appropriate OD gauge shall slide over the
conduit without excessive force, and be tested after the protective cover has been applied.
Conduit fitting size. To determine conformance with the conduit fitting ID requirements of section
4.5.2
3.5.2, each representative sample of conduit fitting shall be checked by means of the appropriate ID gauge used in
4.5.1. As an alternative, conformance of the minimum ID shall be demonstrated by two measurements taken with
an inside caliper at radial positions 90±10 degrees from the midpoint of the fitting ID. Any measurement less than
the minimum ID will constitute a failure of conformance to the requirement. Conduit fitting sizes will
accommodate the conduits listed in Table I.
Interchangeability. To determine conformance with the interchangeability requirement of 3.5.4, each
4.5.3
representative sample of conduit fitting, adapter, associated fitting, and constituent part shall provide for installation
between fixed equipment or threaded fittings such as kickpipes and stuffing tubes.
4.6 Conduit and joint/systems. To determine conformance with the conduit and joint/system requirements of
3.6, each representative sample of conduit, end fitting, and constituent part shall be installed on a test fixture in
accordance with the manufacturer's published instructions. End fittings shall be torqued to the manufacturer's
published specifications to meet installation requirements. Upon completion of the installation, the conduit system
shall be removed from the test fixture. The conduit system shall be reinstalled on the test fixture in accordance with
the manufacturer's instructions and the end fittings torqued to the manufacturer's specifications. Upon completion
of the installation, removal, and reinstallation of the conduit system, a visual inspection shall be performed to
include verification of at least one swivel fitting, or other means of securing the conduit to the fitting without
causing or requiring the conduit to rotate during the fabrication. Evidence of cracks or visible damage to the
conduit or end fitting integrity constitutes failure of conformance to requirements. The test environment
temperature shall be maintained at 68±3 °F (20±3 °C). This verification should be performed prior to shock testing,
and may use the bedplate of the shock test platform.
4.7
Conduit/conduit fitting integrity tests.
Compression. To determine conformance with the conduit compression requirements of 3.7.1, each
4.7.1
representative sample of conduit shall be tested as specified in IEC 60614-1. The exception is maximum
compression, when measured under full load, shall not exceed 10% of the conduit ID.
Impact. To determine conformance with the conduit system impact requirements of 3.7.2, each
4.7.2
representative sample of conduit fitting, adapter, and constituent part shall be tested as specified in IEC 61035-1.
Any signs of disintegration or visible cracks in any of the representative samples shall be cause for rejection.
Vibration. To determine conformance with the conduit system and vibration requirements of 3.7.3,
4.7.3
each representative sample of conduit shall be tested as specified in MIL-STD-167-1, Type 1. Failure of the sample
to remain intact and failure of the end fittings to remain torqued to the manufacturer's specification shall constitute
cause for rejection.
Tensile strength. To determine conformance with the conduit system tensile strength requirements of
4.7.4
3.7.4, each representative sample of conduit system, torqued to manufacturer's specification, shall be tested as
specified in IEC 60614-2-5 with a tensile force of 224.80 lbs (1000 N). After the test, the terminating fittings shall
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