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[ecovarrubias]

Hi,

 

I would like to know if someone can help me clarifying a doubt about natural gas pressure regulation. I know several engineers that will reduce the gas pressure at a regulation station from high (lets say 1200 psig) to low pressure (let say 180 psig) within two or three stages using piloted regulation valves, not control valves.

They argue to use this systems of several regulation stages to avoid the temperature drop that will occur in the case of using only one regulation valve for all the pressure drop.

I don't know really if this is completely true because the pressure at the station outlet will be always the same either we use one, two or more pressure regulation stages so the temperature at the outlet should also be the same, or am I missing something.

 

I will appreciate if someone can give me some hints about this topic.

 

Thanks in advance.

 

[curious_cat]

Could they be taking credit for whatever heat transfer will happen between the stages? Sounds not a lot unless you have some heat transfer arrangement.

 

To me the reason sounds more a practical constraint of getting the right operating characteristics from a single valve needing to provide a huge deltaP