HH-I-1751/4, FEDERAL SPECIFICATION: INSULATION SLEEVING, THERMAL, PIPE COVERING (URETHANE) (06-AUG-1973) [NO S/S DOCUMENT]

HH-I-1751/4, FEDERAL SPECIFICATION: INSULATION SLEEVING, THERMAL, PIPE COVERING (URETHANE) (06-AUG-1973) [NO S/S DOCUMENT]., This specification covers the requirement for rigid cellular urethane thermal insulation fabricated or preformed into standard shapes for pipe and tubing operating within a temperature range of minus 100 deg. F. to plus 220 deg.F.