For the calculation of the force on the blind flange of an expansion joint, does the internal pressure refer to gauge pressure or absolute pressure?
Thread Content
Pt=P*A, where P is the internal pressure; does this refer to absolute pressure or gauge pressure of the pipe?
You can call the manufacturer to ask; I think it should be gauge pressure
Gauge pressure: the pressure experienced on the side in contact with the medium should be absolute pressure; however, the side in contact with the atmosphere is also subjected to atmospheric pressure. Thus, the pressure difference is absolute pressure minus atmospheric pressure, which is gauge pressure
Gauge pressure. It is safer to calculate based on absolute pressure.
In calculations, absolute pressure is generally used, and it is then converted to gauge pressure
Gauge pressure~~~~~ haha~~~~
It should be gauge pressure; you can contact the manufacturer to confirm
It must be gauge pressure; even if it were absolute pressure, the difference would only be 1 kilogram. If you’re not sure, use absolute pressure instead. I used to work on expansion joint design at a state-owned enterprise for 4 years. By the way: the area in question isn’t the area of the pipe, lol
Gauge pressure: When the properties of the gas are not under investigation, pressure generally refers to gauge pressure
Gauge pressure, when analyzed fundamentally, results from the principle that the force exerted by the blind plate arises from the difference between the pressure inside the pipeline and the external pressure; this difference manifests itself in the flexible parts of the pipeline, generating a thrust on the fixed points. Therefore, it is definitely gauge pressure. Also, do not overlook the difference between gauge pressure and absolute pressure; in large-diameter pipes, the force required to apply a blind flange differs significantly when there is a pressure difference of 1 kilogram. In the case of a negative-pressure pipeline, the force exerted by the blind plate is a compressive force, and the instability of the pipeline system must also be taken into account.
It must be gauge pressure; the force on the blind plate is actually caused by the difference between internal and external pressures, so it is gauge pressure