Specific design principles for plastic-coated steel pipes

Pipeline design is to select a plan based on comprehensive considerations such as practicality, safety, reliability, and economy. Specific design and calculation should follow the following principles:

1. Meet the life requirements of plastic-coated steel pipes. Considering the purpose of use, new pipes, especially plastic pressure pipes, should first consider the service life rather than the allowable load. This is because the pipe itself is a permanent structure and its service life should be consistent with the service life of the building.

2. The inner diameter of the plastic-coated steel pipe must meet the flow requirements. The inner diameter, flow rate, and flow rate of the plastic-coated steel pipe are closely related. On the premise of meeting the flow requirements, the flow rate should be selected to determine the inner diameter of the plastic-coated steel pipe.

3. The wall thickness of the plastic-coated steel pipe must meet the pressure requirements. The rated pressure of the pipeline is closely related to the wall thickness of the plastic-coated steel pipe and the ring stress of the pipe itself. If the pipe is selected, it means that the ring stress of the pipe has been determined. The rated pressure of the plastic-coated steel pipe is only related to the wall thickness of the pipe. Therefore, the wall thickness of plastic-coated steel pipes must meet the rated pressure requirements.