Insulation pad for pipes and vessels

An insulated pipe comprising:

• a pipe having an outer surface with a temperature above 500° F.;
• an insulation pad disposed directly on the outer surface of the pipe, the insulation pad comprising only a binderless pack of glass fiber and an envelope:
• the binderless pack of glass fibers in the form of a mat with a first major surface and a second major surface and;
• wherein the glass fibers are mechanically entangled by needling such that the binderless pack has a density of from 4.5 to 5.5 pounds per cubic foot;
• wherein the glass fibers have a diameter range of from 15 HT to 19 HT;
• and
• the envelope forming the exterior of the pad and disposed around the exterior of the binderless pack of glass fibers;
• wherein the envelope is closed by stitching and at least one stitch passes through the envelope and the pack.

A pipe insulation pad for use in temperatures at or above 500° F. surface temperature, the insulation pad consisting of a fibrous insulation pack and an envelope:

• the fibrous insulation pack having a first major surface, a second major surface, and an R value (hr-ft2 °F/BTU) of between 4.4 and 5 at 75° F., between 2.5 and 4 at 300° F., between 2.0 and 3.0 at 500° F., and between 1.4 and 2.0 at 700° F.;
• the envelope forming the exterior of the pad and disposed around the fibrous insulation, wherein the envelope contacts both the first major surface and the second major surface;
• wherein the envelope contacts both the first major surface and the second major surface;
• wherein the envelope is closed on all sides around the fibrous insulation pack;
• and
• wherein the envelope is closed by stitching and at least one stitch passes through the envelope and the pack.