Removable flexible pipe insulation

A removable, reusable insulating unit for insulating an exposed pipe section extending between existing pipe insulation on opposite sides of said exposed pipe section, said pipe insulation forming a part of an insulated pipe system, said insulating unit comprising a hollow body portion having insulating walls for enveloping such exposed section of an insulated pipe system, said body portion is covered inside and outside with a substantially non-rigid protective covering, said body portion having at least one parting line along its length dimension, said body portion being separable along said parting line to provide an entrance into a cavity defined within said insulating walls of said body portions, said insulating walls being formed of sufficiently flexible material to permit spreading of said insulating walls to open said entrance and place said unit about such exposed section of an insulated pipe system, said insulating walls abutting along said parting line to close said entrance, means for fastening said insulating walls in abutting relationship along said parting line and with said entrance closed, said insulating unit having one or more openings through which one or more components of an insulating pipe system passes, said parting line intersecting all of said one or more openings, each of said openings being defined by a perimeter end portion extending around the end of said insulating walls, said insulating walls of said body portion comprising a flexible first insulating material and said perimeter end portion for each said opening comprising a second insulating material which is substantially more dense than said first insulating material, said second insulating material being thicker in a radial direction of said opening than said first insulating material whereby said second insulating material defines inwardly extending arcuate segments forming the desired shape for each corresponding said opening when said fastening means closes said entrance between abutting portions of said insulating walls, at least one of said one or more openings has said parting line intersecting an edge thereof, said second insulating material includes means defining a hinge-like member opposite said parting line to permit opposing elements of said perimeter portion to swing away from one another about said hinge means as said entrance is opened, said hinge means permits said opening of said opposing elements to clamp around said existing insulation when said fastening means is secured with said insulating walls in abutting relationship along said parting line.