ASTM C740/C740M-13(2019)

Annotation of standard text ASTM C740/C740M-13(2019) :

This practice covers the use of thermal insulations formed by a number of thermal radiation shields positioned perpendicular to the direction of heat flow. These radiation shields consist of alternate layers of a low-emittance metal and an insulating layer combined such that metal-to-metal contact in the heat flow direction is avoided and direct heat conduction is minimized. These are commonly referred to as multilayer insulations (MLI) or super insulations (SI) by the industry. The performance considerations, typical applications, manufacturing methods, material specification, and safety considerations in the use of these insulations in cryogenic service are also discussed. MLI can be manufactured by any of the following: spiral-wrap method, blanket method, single layer method, and filament-wound method.


Keywords:
aluminized films, aluminum foil, cryogenic insulation, cold vacuum pressure, effective thermal conductivity, fiberglass paper, layer density, gas conduction, heat flux, heat transfer, multilayer insulation, polyester film, polyester net, radiation, radiation shields, reflectors, reflective insulation, residual gas, spacers, super insulation, thermal insulation system, thermal performance, vacuum environment, vacuum insulation, vacuum jackets,, ICS Number Code 27.200 (Refrigerating technology)