Upon completion of production and at the time of product inspection and delivery, composite thermal insulation pipes should be delivered in accordance with the following requirements, unless otherwise specified: The composite thermal insulation pipe factory may arbitrarily select seamless pipes with a DN40 or less, and the ends of the thick pipes should be cut into flat ends or bevelled flat ends. Spray-wrapped thermal insulation pipes
Composite Insulated Pipes with DN≥50, when the wall thickness of the pipe is less than that of the thickened pipe, generally use bevelled flat ends. For composite insulated pipes with DN≥50 and an inner diameter thickness greater than that of the thickened pipe, they should be cut to flat ends. The concept of bevelled flat ends refers to seamless pipes with 1/16±1/32 feet (1.6mm±0.8mm) of correct measurement from the root chamfer to the drop接管 axis wire, inclusive of 30°. Clients and composite insulated pipe manufacturers have the right to request flat ends with other angles of the bevel angle. Spray-wound insulated pipes.
For product analysis and tensile testing, the same batch of composite insulated pipes should be composed of seamless tubes manufactured from the same melting furnace. For batches with sizes less than DN150, and for batches with sizes equal to or greater than DN150, as well as for batches with sizes equal to or greater than 200mm, the rest constitutes a separate batch. For tensile testing, a batch of composite insulated pipes consists of any batch of tubes with the same size and thickness manufactured from the same melting furnace, with each batch having fewer than 400 tubes, and the rest forming a separate batch. For flattening tests, a batch of composite insulated pipes should consist of tubes with the same size and thickness manufactured from the same melting furnace.
