13.2 Insulation Applications. Use criteria in NFGS-15250, Insulation of
Mechanical Systems to specify materials for insulating and covering piping
and equipment. Special insulation is included for engine exhaust piping.
Water and lube oil lines to generators are not specifically covered. Such
lines attached to the engine or with a flow path through the engine are
considered to be in the temperature range of 140deg.F to 200deg.F (60deg.
to 90deg. C) and therefore require insulation. Only asbestos-free
materials shall be used for insulation, as is required in OPNAVINST 5100.23,
17005(a), Navy Occupational Safety and Health Program.
13.3 Economic Thickness. The computer program of the Thermal Insulation
Manufacturers Association (TIMA), How to Determine the Economic Thickness of
Insulation, should be used to select the most cost effective thickness.
13.4 Fire Limitations. Building and equipment insulation material should
have a flame spread rating of 25 or less, and smoke developed rating of 50
or less when tested in accordance with the American Society of Mechanical
Engineers (ASTM) E-84, Surface Burning Characteristics of Building