What is internal pressure imbalance force, and what is the internal pressure thrust of an expansion joint?
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As the title suggests, these concepts are hard to understand; there are no accurate definitions available on Baidu either, so it’s impossible to comprehend them
The internal pressure thrust of an expansion joint refers to the thrust generated by the bellows compensator under internal pressure, commonly known as the \"blind plate force\".
The internal pressure imbalance force refers to the static structural force generated by the asymmetry of the pipe cross-sections on either side of the fixed point under the action of internal pressure. The internal pressure thrust of an expansion joint refers to the thrust generated by the bellows compensator under internal pressure, commonly known as the \"blind plate force\".
The internal pressure imbalance force refers to the axial force acting on the pipeline caused by the pressure difference resulting from different pressures on the two sides of the elbow. This force is commonly present in the pipes of reciprocating compressors or reciprocating pumps. The blind plate force is the force generated by the internal pressure of the pipeline multiplied by its internal cross-sectional area. Gailido is mainly used in pipes with expansion joints. (In fact, all pipes have blind plate force; it’s just that the blind plate force on the pipes of expansion joints becomes apparent.) For pipes without expansion joints, the force on the blind flange can be balanced by the pipe itself.)
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Do these two mean the same thing? How can the pressures at the elbows on both sides be different?
Two are not the same meaning. The pressures at the elbows on both sides are different, mainly due to pressure fluctuations in reciprocating pumps or reciprocating compressors. The length between the elbows divided by the speed of sound gives the phase difference of the wave pattern; in a sine function, a phase difference results in a pressure difference. This pressure difference induces axial vibration forces in the pipeline, thereby causing the pipeline to vibrate.
The internal pressure of the expansion joint: An expansion joint can be considered as a cylindrical balloon. This balloon is soft and tends to expand outward; in order to prevent it from bursting due to excessive expansion, its two ends need to be held in place. The force used to hold these ends in place is equivalent to the force exerted by a blind flange.