The standards require that tightening should not be done under pressure. But during operation, isn’t thermal tightening essentially tightening under pressure? Isn’t that a contradiction?
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The standards require that tightening should not be done under pressure. But during operation, isn’t thermal tightening essentially tightening under pressure? Isn’t that a contradiction?
Proper safety measures in place permit thermal fastening; when the design pressure is less than or equal to 6 MPa, the maximum internal pressure for thermal fastening should be 0.3 MPa； When the design pressure is greater than 6 MPa, the maximum internal pressure for thermal tightening shall be 0.5 MPa, and cold tightening shall be carried out after depressurization.