CS reducer for Line size reduction from 44" to 20" 1

[cjabhijit]

Hello Dear Experts,

Need your help on this. Want to expand a 20" NPS line from 20" to 44" connecting to a 44" Nozzle.

What are the options?

Can we check the possibility of getting the nozzle size changed from Vessel vendor?

If it is not possible what no. of reducers? Is it 3 as per 16.5 i.e 44x36 then 36 x 24 & then from 24 x 20.

Can we have it symmetrical through required reduceres still remain 3 nos. That is what process has preferred when I had a word with them. Hence reducers will be 44x36 then 36 x 28 & then from 28 x 20

Pls share your experience with this kind of situation.



Thanks & Regards,
Abhijit

 

[LittleInch]

I would make your own.

ASME B 31.3 section 304.6 and other sections in 304 refer to various sections in ASME VIII.

Either that or have the three as you mention, note the code is ASME B 16.9 (not 16.5) and you can do multiple combinations. It often looks better in these instances to try and even out the size changes as you've done it, but other sizes may be more easily obtained such as 30" and 36".

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[cjabhijit]

Thanks LittleInch.

I will first try to get vendor on board to check whether he can change the nozzle size.

If not, will try to even out the reduction...possibly better option than having non even reduction.

Thanks & Regards,
Abhijit

 

[pennpiper]

cjabhijit,
Changing the nozzle size sounds like the best idea if the vessel is still in the shop and the 44" nozzle is not already completed.

By the way what:
- is the direction of flow (into the vessel or out of the vessel)?
- is the fluid state (gas or liquid)?


Sometimes its possible to do all the right things and still get bad results

 

[cjabhijit]

pennpiper,

Thanks for your concern & advice.

Clarification as below-

- flow is into the vessel
- fluid state is liquid

As it is coming in liquid line I think I should have uniform reduction as a must....even Process guy is suggesting the same however as this is a package item (group seperator-horizaontal tank like) Vendor to confirm.

Thanks & Regards,
Abhijit

 

[EmmanuelTop]

Can you use a reduced tee 44"x20" and have one 44" side of the tee blind-flanged?

Dejan IVANOVIC
Process Engineer, MSChE

 

[cjabhijit]

EmmanuelTop,

This is not a conventional way of doing it. At least I have not seen doing this to save on reducers.

Thanks & Regards,
Abhijit

 

[EmmanuelTop]

More or less, this is how it looks when pipe header is feeding a vessel. A large-diameter line and plenty of smaller lines tapped into it, upstream of the vessel.
I can't foresee any issues with application of reduced tee in 100% liquid system, but I don't know all the details so I might be wrong.

Dejan IVANOVIC
Process Engineer, MSChE

 

[Gator]

I'm not sure how EmmanuelTop's suggestion is supposed to work (see attached sketch).



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