Operating pressure of the piping system
Thread Content
For example, in the pipeline from the pump outlet to the equipment, the pressure gauge at the pump outlet reads 0.15 Mpa, while the pressure gauge at the equipment inlet reads 0.05 Mpa. What is then the operating pressure of this pipeline?
The working pressure before the pump and the pressure after the pump are different. The corresponding value is the pressure reading.
There is a pressure drop. What the original poster is referring to is not the front and back of the pump, but the back of the pump and the front of the equipment
Your question is about whether there’s a problem with the pipeline design when the pressure drops from 0.15 Mpa to 0.5 Mpa. So normally, one should check what the design parameters are
The operating pressure of the pipeline is usually taken as the highest possible pressure during system operation. Based on the data you provided: Pump outlet pressure: 0.15 MPa (gauge pressure). Equipment inlet pressure: 0.05 MPa (gauge pressure). Key analysis: The highest pressure along the pipeline is at the pump outlet (0.15 MPa), as the pressure decreases gradually as it moves downstream due to resistances such as friction, elevation differences, and valves, reaching 0.05 MPa at the equipment inlet. The operating pressure should be based on the highest pressure that the pump is capable of generating, taking into account the following: if the pump’s rated outlet pressure or shut-off pressure (such as the pump’s cut-off pressure) is higher than 0.15 MPa, that higher value shall be used. If 0.15 MPa is already the maximum operating pressure for the pump, then the operating pressure in the pipeline is 0.15 MPa (gauge pressure). Additional consideration: If the system is subjected to abnormal operating conditions (such as water hammer or sudden start/stop), an additional safety margin must be provided. The design pressure is usually the operating pressure plus a safety factor (such as 1.1 to 1.3 times). Conclusion: Under no other abnormal conditions, the operating pressure of the pipeline can be set at 0.15 MPa (gauge pressure), but further confirmation is required based on the pump’s rated parameters and system characteristics
The pipeline pressure should be consistent with the pump outlet pressure; although there is a pressure drop in the pipes, this does not prevent the pressure in the section downstream of the pump outlet from remaining at the pump’s outlet pressure