Threaded Connection: The threading process should be done using an automatic threading machine in accordance with the current national standard GB/T7306.
Flange Connection:
One-time Installation Method: On-site measurement and drawing of a single-line processing diagram for the pipeline can be conducted. After processing, coating, and lining, the pipes are transported to the site for installation.
Two-time Installation Method: Non-coated and non-lined steel pipes and fittings can be used on-site for flange welding and pipe assembly. Afterwards, the assembly is disassembled for coating and lining processing before being transported back to the site for installation.
Grooved Connection: Pre-fabricated grooved plastic-coated pipe fittings should be preferred. Grooves should be pressed using a special grooving machine, and the depth of the grooves should comply with relevant standards (CJ/T156-2001).
Socket Connection: Also known as flared connection, this method addresses the issue of water seepage in pipeline connections by altering the sealing structure of the pipe fittings. The flared connection ensures a tight seal between the pipe fittings and the plastic-coated steel pipe. This method is simple and convenient for construction and is mainly used in wiring pipelines.
Bimetallic Welding: Also known as lined welding connection, this method utilizes special welding prefabrication techniques at both ends of the steel pipe to bond carbon steel with stainless steel. This avoids damage to the coating layer during welding, making it the best connection solution for plastic-coated steel pipes, especially those buried underground.
