Suction line vs Discharge line
Suction line vs Discharge line
(OP)
Why is the suction line one size smaller than discharge? Why one rather than 'atleast one'? Also, what would happen if they both were the same size?
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Suction line vs Discharge line
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Suction line vs Discharge lineSuction line vs Discharge line(OP)
Why is the suction line one size smaller than discharge? Why one rather than 'atleast one'? Also, what would happen if they both were the same size?
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RE: Suction line vs Discharge line
RE: Suction line vs Discharge line
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Suction line vs Discharge line
Your posting (Why is the suction line one size smaller than discharge?) is incorrect.
Typically (on an end suction centrifugal pump):
a). The Pump Suction line is one (or more)sizes larger than the pump suction nozzle.
b). The suction nozzle is one size larger than the discharge nozzle.
c). The discharge line is normally one size larger than the discharge nozzle.
Example:
Suction line size = 8" or 10"
Pump suction nozzle size = 6"
Pump discharge nozzle size = 4"
Discharge line size = 6"
You should also read this posting
http://www.eng-tips.com/viewthread.cfm?qid=239699
In the future you should also use the "Search" (located at the top of the page) to see if the question has already been asked.
RE: Suction line vs Discharge line
From "BigInch's Extremely simple theory of everything."
RE: Suction line vs Discharge line
Thanks for your help!
RE: Suction line vs Discharge line
Please read the previous post.
From "BigInch's Extremely simple theory of everything."
RE: Suction line vs Discharge line
It all depends on the application.
For short distances on water piping such as in a building, 7-8 ft/sec pipe velocity is economical on the pump discharge. If you are pumping a long distance, 3-5 ft/sec pipe velocity is appropriate on the pump discharge.
You may have other considerations such as solids in the fluid, fluid properties such as viscosity, fluid velocity, pipe materials available on the jobsite, etc.
The rule of thumb for suction piping is "least one size larger than the suction flange".
Suction piping should be at least one size larger than the suction flange at the pump.
RE: Suction line vs Discharge line
From "BigInch's Extremely simple theory of everything."
RE: Suction line vs Discharge line
He or she did not define:
- the type of pump (Centrifugal or Positive Displacement)
- the configuration of the pump (end suction/top discharge, top suction/top discharge, side suction/side discharge, single stage, multistage, Base plate mounted, In-Line, etc.)
- the size of the piping and pump nozzles
- the commodity
- the type of installation (refinery , power, pharmaceutical, Food, Central plant HVAC, etc.)
- the country where installed
The better the information supplied the better the answer given.
RE: Suction line vs Discharge line
RE: Suction line vs Discharge line
To answer your question, yes in certain cases a suction line and discharge line may be the same size, as noted in this string of comments, generally the suction line is bigger than the discharge line for NPSH and velocity issues, however, depending on the type of pump you are referencing this may change.
There are a number of pump manufactures that offer HSC pumps with the same size on both discharge and suction.
Also most all your vertical turbine centrifugal pumps are with the same size column (suction) as the discharge.
So there are many factors, along with the type and make of pump, to determine whether the pump may be supplied with the same size suction and discharge.
hope this helps.