Regarding pipeline working pressure and design pressure
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According to the chemical engineering standard HG20570.1-95 \"Determination of Design Pressure and Design Temperature for Equipment and Piping Systems\", clause 2.0.4.3 states that \"the design pressure of all pipes connected to equipment shall be no less than the design pressure of the equipment to which they are connected.\" ”If the designer specifies a design pressure of 1.0 MPa for the equipment ordering parameters, yet the owner chooses equipment with a design pressure of 1.6 MPa when purchasing it (meaning that this pressure is sufficient to meet the process requirements, but there is a significant margin). ), at this time, when the designer is planning the pipes for connecting to the equipment, should the design pressure of these pipes be set at more than 1.0 MPa, or must it be more than 1.6 MPa????
This post was last edited by Refiner on 2015-8-9 07:30. The design pressure of the equipment should be based on the as-built drawings; other sources cannot be relied upon, not even the equipment’s nameplate. I’m not sure whether it will be marked as 1.0 or 1.6 MPa?
It must be no less than 1.6 MPa; otherwise, why would you choose 1.6 MPa?
Both should be possible, but in practice it is important to ensure that the pipelines do not experience overpressure, especially when testing both the equipment and the pipelines together
The design specifies a design pressure of 1.0 MPa for the equipment; therefore, the pipes should also be designed at 1.0 MPa in theory. The operating pressure of the actual system will be lower than 1.0 MPa, ensuring the safety of the entire system. Although the equipment now requires 1.6 MPa, as long as the process parameters are correct, there will be no safety issues.
I’m a bit confused. Does that mean the pressure in the pipeline must be at least equal to or greater than the design pressure (or operating pressure) of the equipment connected to it? I have a reactor with a pressure of 4-5 MPa; do all the pipes connected to it need to be designed for 5 MPa as well? It is a batch-type operation; after the materials are added, all valves are closed, with only the jacket heating and circulating water cooling systems, as well as the pipeline for introducing the reaction gas, being in use. How should the pressure for these pipelines be designed?