The normal pressure in the heat exchanger during steam purging is 0.1 MPA, but when the outlet valve is closed, the pressure can reach 0.3 MPA....
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The normal pressure in the heat exchanger during steam purging is 0.1 MPa. However, if the outlet valve is closed (in the event of an operational error), the pressure can reach 0.3 MPa. Should the design pressure be determined based on 0.1 MPa or 0.3 MPa? Why?
The value of design pressure is determined according to HG20570.1
The design pressure is neither 0.1 Mpa nor 0.3 Mpa
Well, I was asking which criterion should be used to determine the design pressure
The design pressure must be determined based on a higher operating pressure.
Design 0.11MPa with safety valve
The highest pressure under normal operating conditions is used as a reference, and safety measures are implemented to address extreme situations.
Steam pressure testing of heat exchangers is just a relatively ordinary form of pressure testing; in fact, the actual pressure testing of heat exchangers in chemical plants is carried out by specialized pressure testing companies. Moreover, the steam pressure you have is a bit low. The design pressure is much higher than your scanning pressure; it’s slightly higher than the operating pressure during normal operation, seemingly by a factor of 1.25. I can’t remember
It’s neither 0.1 nor 0.3; the design pressure is higher than that of these two
0.1 is the operating pressure; the design pressure is greater than or equal to the operating pressure under the most severe conditions