The plate heat exchanger is fastened by clamping bolts to clamp the plate between the fixed plate and the moving plate to form two media passages between the plates, and two media with different heats pass through the respective channels to realize heat transfer through the plates. The transfer of heat between them. The medium passage of the plate heat exchanger is clamped and compressed by the gasket between the plates, so the pressure test of the plate heat exchanger mainly checks whether the sealing performance of the gasket between the plates meets the requirements for use.
Relying on different forms of plate assembly, clamping and mounting to form two hot and cold media channels. Due to the simultaneous pressurization test of the media channels on both sides, the plate defects may not be verified due to the mixed flow of the medium. The pressure test of the plate heat exchanger shall be carried out on one side of the media passages and without pressure on the other side.. The hydraulic test is to test the quality and sealing performance of the heat exchanger plate, and the pressure test process is designed according to the media flow on both sides.
The test pressure of the plate heat exchanger is 1.25 times of the design pressure. Before the pressure test, the inlet and outlet of the media channels on each side are confirmed by the equipment data or the process piping flow chart, and the test pressure blind plate is set (the medium inlet and outlet are diagonally arranged, One side up and down arrangement), the water is pressurized at the low point nozzle, and the pressure gauges of the same range are set at the high and low points respectively. The high point pressure gauge root valve should be used as the pressure test process exhaust valve, and the high pressure gauge should be installed after the water and exhaust in the whole process is completed. For the plate heat exchanger that completes the piping operation, the overall pressure test is performed by the pipeline process under the condition that the test pressure is satisfied.