The issue of pipeline equipment under negative pressure
Thread Content
Why can the same pipe withstand several kilograms of positive pressure but not tens of kilopascals of negative pressure? How should one calculate the pressure that a pipe can handle under negative conditions?
This is because stability needs to be considered for negative-pressure pipelines. The calculation for negative-pressure pipelines, that is, external-pressure pipelines, follows the requirements of GB 150.3 4
For example, tires can withstand a certain internal pressure of several kilograms, but once they are deflated, even a slight external pressure will cause them to collapse; this is related to the strength of the pipes or equipment
They are two different things – it’s a matter of lateral and radial forces
The calculation of pressure resistance in pipelines takes into account more factors than the calculation for equipment. For a simple calculation, it can be done using the formula for external pressure on the equipment, but the loads on pipes are more complex; for example, pipes may also be subject to bending moments and torques. In such cases, we use stress analysis.
Balloons can withstand a certain internal pressure, but they cannot withstand any external pressure:lol:lol:lol