Pipe size

[wookiyo]

Pump suction size : 4"
Suction Pipe Line Size : 10"

So, 3 Piece of reducer may use in pipe connection as pipe/nozzle sizes have large difference.
In case of using this 3 step reducer necessarily, What problems will be caused in a pump equipment and pipe line system ?

 

[Artisi]

If properly undertaken, no problems would be expected.

As an alternative suggestion - depending on the product and the flow rates, I would investigate - say a 10" blanking plate with either a 6x4 or 8x4 concentric reducer direct to the 10" blanking plate.

Naresuan University
Phitsanulok
Thailand

 

[katmar]

My first reaction would be to check the sizing of the pump and pipeline. This ratio of pump to pipe size would be most unusual unless you are working with a very viscous liquid.

Also, if you are working with a viscous liquid, beware of any additional pressure drop that Artisi's proposal might introduce. Although I have used this arrangement myself (but not on a pump suction) I don't believe it is covered by the standard pipe codes. Check before you use it on a high pressure or dangerous duty. (Note that I am a process engineer and not a piper.)

Katmar Software
Engineering & Risk Analysis Software

http://katmarsoftware.com

 

[TD2K]

I agree a 10" suction with a 4" discharge line seems unusual. Another reason might be a very long suction line. I worked on one set of pumps that took suction from the tanks a couple of thousand feet away (they didn't want pumps in the tank farm). Not a usual set-up however.

 

[stanier]

YOU could always take a side branch from the DN250 suction header using a DN250 x 100 reducing tee or fabricated branch.

Geoffrey D Stone FIMechE C.Eng;FIEust CP Eng

http://www.waterhammer.bigblog.com.au

 

[Ashereng]

If you have a 10" line, you can also use a 4" weldolet to take a side branch off of it, up to ANSI 1500 according to my table.

"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

 

[willard3]

What fluid are you pumping?

If you are pumping water, a 10"-to 4" blanking plate may trap air at the connection and cause cavitation problems with time.

You can purchase eccentric reducers that won't be such a big problem with air.

 

[Artisi]

Willard3.
"if you are pumping water, a 10"-to 4" blanking plate may trap air at the connection and cause cavitation problems with time."


Only if you put the 4" connection at other than at the top of the 10" pipe, simply have the top of the 4" and the 10" pipe at the same level.

Katmar.
I wouldn't expect that the square entry of the 4" pipe onto a blanking plate to be any worse than a combination of an 10x8 + an 8x6 + a 6x4 reducer as suggested in the original posting.

Naresuan University
Phitsanulok
Thailand

 

[unclesyd]

I've seen a lot of conical reducers used in similar size combinations, especially in water service.

They were of both the homemade and forged type.