PUF Pipes Manufacturing Methods

Heat insulated and waterproof tubes are usually produced in the form of “annular tubes”. There are two basic methods of polyurethane foam tubes production. The first approach is a tube polyurethane coating by means of spraying or deposition. The second method is coating of a pipe with a polyurethane foam shell which is produced separately. In subsurface pipelining those waterproof pipes are used which are made of low pressure polyethylene (polyethylene mantle-pipes). Spiral lockseam tubes produced from galvanized steel band are used in above-ground pipelining.