MIL-PRF-24758A(SH)
3.4 Environmental conditions. Flexible conduits (see 6.3.12), conduit fittings, and constituent parts supplied
under this specification shall meet the following environmental conditions (see 6.3.9).
Temperature range. -40°F to +257 °F (-40 °C to +125 °C).
3.4.1
Relative humidity. 10 to 100%.
3.4.2
Solar radiation. 1120±47 watts per meter squared (W/m2).
3.4.3
Shipboard environmental conditions. In addition, the equipment supplied shall be able to withstand
3.4.4
salt fog, greenwater loading (see 6.3.13), stack gas and external influences (see 6.3.11), normal wear and tear
evolutions such as line and hose handling evolutions, fresh/saltwater washdowns, shipboard shock, and jet blast
effects. Equipment applications require satisfactory performance under weapon effects including shock (see 6.3.16)
and EMP effects.
3.5
Flexible conduit and fitting size.
Flexible conduit size. Flexible conduit size shall be specified (see 6.2) by nominal ID in accordance
3.5.1
with Table I to accommodate Naval shipboard external use applications. For conduits normally provided with a
protective coating, the test for measuring the outside diameter will be conducted after the application of the
protective coating. Dimensions and tolerances shall be interpreted as specified in Table I.
TABLE I. Conduit sizes.
Nominal ID
Minimum ID
Maximum OD
(inches/metric)
(inches/metric)
(inches/metric)
.25 in (6 mm)
.245 in (6.223 mm)
.58 in (14.732 mm)
.50 in (13 mm)
.495 in (12.573 mm)
.85 in (21.59 mm)
.75 in (19 mm)
.745 in (18.923 mm)
1.10 in (27.94 mm)
1.00 in (25 mm)
.995 in (25.273 mm)
1.41 in (35.814 mm)
1.25 in (32 mm)
1.245 in (31.623 mm)
1.66 in (42.164 mm)
1.50 in (38 mm)
1.495 in (37.973 mm)
1.91 in (48.514 mm)
2.00 in (50 mm)
1.995 in (50.673 mm)
2.44 in (61.976 mm)
2.50 in (63 mm)
2.495 in (63.373 mm)
2.94 in (74.676 mm)
3.5.2 Conduit fittings size. Conduit fittings shall be specified (see 6.2) by nominal ID of flexible conduit in
which they are to be installed. Conduit entries in conduit fittings shall be suitable for flexible conduits that will
accommodate those conduit sizes listed in Table I. Means shall be provided within the conduit system for securing
the conduit to the conduit fitting and internally will provide for protection for the conductors or cables.
Interchangeability. The threads of conduit fittings and constituent parts shall be compatible with
3.5.3
standard shipboard interfaces.
3.6 Conduit system. Conduits, conduit fittings, and constituent parts shall provide for installation, removal,
inspection, and reinstallation of assemblies between fixed threaded fittings. The conduit system shall have at least
one swivel fitting (see 6.3.17) attached, or other means of securing the conduit to the fitting without causing or
requiring the conduit to rotate during the fabrication. The conduit system shall provide protection for the
conductors and cables contained therein.
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