MIL-DTL-29210 Hose Assembly, Rubber, Metal Lined, Wire Reinforced, 250 Psig, Saturated Steam ServiceThis specification covers metal lined, wire reinforced, rubber-hose assemblies for conveyance of saturated steam. The working pressure of this hose is 250 pound-force per square inch gauge \(psig\) \(1.72 MPa gauge\) at a temperature of 406 Deg. F \(208 Deg. C\).

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MIL-DTL-29210E

3.4.1 Hose body (see figure 1). The hose shall consist of the following:

a. A heat-resistant inner tube, properly compounded to resist saturated steam that shall not blister,

pit, flake, peel, or popcorn when tested as specified in 4.7.2.4.

b. The hose shall be reinforced by two or more stainless steel, brass, or zinc-plated high tensile

carbon steel wire braids or spirals with a layer of rubber between each braid or spiral.

c. A heat-resistant, abrasion-resistant, and ozone-resistant rubber cover. The cover on the hoses

shall be perforated after cure with not less than 260 holes per 36-inches (914 mm) hose length,

e.g. in four rows radially spaced at 90 degrees around the periphery.

FIGURE 1. Hose configuration.

3.4.2 Metal liner. The metal liner shall be corrosion resistant steel type 302, 304, 316, or 321. The

corrosion resistant steel inner liner shall be unpacked, fully interlocked, four-wall, flexible tubing, see

figure 2. There shall be no sharp edges or burrs on the ends of the metal liner to cause damage to the

tube during assembly or in service. The liner shall be allowed to float free within the hose. The physical

requirements for the liner shall be as specified in table V, see 6.4. The liner shall extend along the entire

length of the assembly.