Flexible heating wrap apparatus for charged cylinders

Claim 1

A heating wrap apparatus in combination with a pressurized refrigerant cylinder; wherein, the heating wrap apparatus consists of: a flexible heating unit comprising a plurality of flexible heating coil elements arranged into groups of at least two heating coil elements wherein each of the groups is provided with its own thermostat member and all of the groups share a common electrical input and output member; an insulation unit disposed adjacent to one side of the flexible heating unit; wherein, the insulation unit comprises: a relatively thick generally rectangular mat of insulation material; and, a sheet of insulated fabric that is disposed intermediate the mat of insulation material and the said plurality of flexible heating coil elements; a housing unit comprising a fabric envelope that surrounds the flexible heating unit and the insulation unit; wherein, the fabric envelope is provided with an inner and outer layer; and, releasable securing means associated with the opposed ends of the housing unit; whereby, the housing unit may be circumferentially engaged to said pressurized refrigerant cylinder.