Why reducers in the by-passes systems 1

[Ferex]

As I wrote in the subject I would like to know what's the function of reducers in a by-pass, I attach a little picture to clarify things, I hope you will answer me, many thanks.

 

[BigInch]

So you don't have to buy a big 6" control valve and run it 20% open (with poor control characteristics) when you could otherwise have a properly sized 4", pay less money and run it between 30% - 80% (at a good range for change in pressure or flow vs a reasonable change of position).

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"Pumping accounts for 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[Ferex]

This forum is marvellous, I had my answer in 7 minutes!!!
Thank you BigInch, I thought there was some fluidodynamical reason

 

[BigInch]

Ferex, You're very welcome.

There is! Did you just focus on the cost part of it?

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[Ferex]

Yes it's a technical reason strictly linked to economical reasons. I meant this... Bye and thanks again

 

[JohnBreen]

Ferex,

Don't you think that BI deserves a "Thanks BigInch" purple star for his quick and insightful reply?

John

 

[BigInch]

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[europipe]

Ferex, the by-pass is the part with the 4" valve,
not the control valve + reducers.

Greetings

 

[BigInch]

I took it as the whole assembly being a bypass for an attached piece of equipment and the 4" block valve being a bypass for the control valve. No matter. Still the same.


**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[europipe]

Whatever, your reply was excellent as always.