sheiko
Chemical
- May 7, 2007
- 422
Hello,
I am a french process engineer working in an Engineering Company.
My problem is that the piping engineer asked me the following data for a number of non-return valves:
- The min. and max. flowrates
- The min. and max. operating pressures
- The min. operating temperature
- The minimum pressure drop (for opening)
It is the first time i am asked this but i have found some data. For example, i have considered the design conditions for the max. conditions (flowrate, pressure). However i have some doubts concerning the definition of the min. conditions and the min. pressure drop.
Before asking the piping engineer more precisions, i was wondering if you could help me clarify some points, namely:
1/ Does the min. flowrate correspond to the min. operating flowrate or the min. flowrate for full lift?
2/ What is the purpose of min. pressure? Can i consider the atmospheric pressure (0 barg) or the full vacuum pressure (-1 barg) which could occur during start-up, shut-down or maintenance?
3/ What is the purpose and how to calculate the min. pressure drop? are there some typical values by type of valve?
If you have interesting references, please feel free to share.
Thanks in advance.
"We don't believe things because they are true, things are true because we believe them."
I am a french process engineer working in an Engineering Company.
My problem is that the piping engineer asked me the following data for a number of non-return valves:
- The min. and max. flowrates
- The min. and max. operating pressures
- The min. operating temperature
- The minimum pressure drop (for opening)
It is the first time i am asked this but i have found some data. For example, i have considered the design conditions for the max. conditions (flowrate, pressure). However i have some doubts concerning the definition of the min. conditions and the min. pressure drop.
Before asking the piping engineer more precisions, i was wondering if you could help me clarify some points, namely:
1/ Does the min. flowrate correspond to the min. operating flowrate or the min. flowrate for full lift?
2/ What is the purpose of min. pressure? Can i consider the atmospheric pressure (0 barg) or the full vacuum pressure (-1 barg) which could occur during start-up, shut-down or maintenance?
3/ What is the purpose and how to calculate the min. pressure drop? are there some typical values by type of valve?
If you have interesting references, please feel free to share.
Thanks in advance.
"We don't believe things because they are true, things are true because we believe them."