MIL-PRF-22344E
3.2 Material. The fibrous insulation material shall be compressed or otherwise formed into pipe
insulation (see 6.3). The insulation may be split or slit lengthwise.
3.2.1 Prohibited fibers. Neither asbestos nor ceramic (refractory) fibers nor materials containing any of
these fibers shall be used in the insulation.
3.3 Dimensions. Pipe insulation shall be furnished in the dimensions specified in 3.3.1 through 3.3.4.
3.3.1 Length. Pipe insulation shall be furnished in lengths of 3 to 6 feet with tolerance of plus or minus
3/16 inch (see 6.2).
3.3.2 Size. Insulation shall be furnished to fit standard pipe and tube sizes (see 6.2), from 1/4 to 36
inches. The longitudinal seam shall close to within 1/8 inch along the entire length of the section. The inside
diameter of the insulation shall not exceed the outside diameter of the pipe by 1/4 inch for nominal pipe sizes
(nps) up to 4-1/2 inch or by 5 percent on sizes over 4-1/2 inches nps.
3.3.3 Thickness. Insulation shall be furnished either single or double layer in nominal thicknesses of 1/2
to 4 inches in increments of 1/2 inch, according to simplified standard sizes (see 6.2) with tolerance of plus or
minus 3/32 inch in thickness.
3.3.4 Density. Insulation shall have a nominal density of 5.0 pounds per cubic foot (lb/ft3) with a
tolerance of plus or minus 2.0 lb/ft3.
3.4 Alkalinity and pH. Alkalinity of the pipe insulation expressed as equivalent sodium oxide (Na2O)
shall be not greater than 0.60 percent and the pH shall be not less than 7.5 nor more than 12.0.
3.5 Hot surface performance. Pipe insulation shall be suitable for use at temperatures up to and
including 370oF, and at thicknesses up to 4 inches. Pipe insulation shall show neither evidence of flaming,
glowing, smoldering, nor smoking. There shall be no degradation which will seriously affect performance. Minor
loss of binder or slight discoloration of the binder shall be acceptable. There shall be neither cracking nor
delamination of the insulation. The insulation thickness along the top of the pipe shall decrease by not more than
10 percent.
3.6 Fire performance. Insulation shall conform to the requirements of MIL-STD-1623.
3.7 Thermal conductivity. Thermal conductivity shall be not greater than the following values:
Thermal Conductivity
Mean Temperature, oF
(Btu-in/hr-ft2-oF) (1 inch thickness)
25
0.23
50
0.24
75
0.25
100
0.26
200
0.31
3.8 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the material
meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life
cycle costs.
3.9 Toxicity. The insulation shall have no adverse effect on the health of personnel when used for its
intended purpose. The insulation shall be assessed by the Navy Environmental Health Center
(NAVENVIRHLTHCEN) using the administrative Health Hazard Assessment (HHA). A flowchart for this process
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