Jump to content



Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

0

Isolation Of A Throtlling Valve

globe valve control valve bypass drain equipment isolation

2 replies to this topic
Share this topic:
| More

#1 hemsanjay

hemsanjay

    Brand New Member

  • Members
  • 1 posts

Posted 30 April 2018 - 05:20 AM

Good Day everyone,

While having a throttling valve, example- a globe valve, the isolation to the globe valve is almost always in the upstream of the globe valve and not in the downstream of it.

 

For example, In most equipment draining case or a control valve bypass case, a globe valve is always followed by a ball/gate valve. what significance does the isolation valve contribute in conrolling the flow rate being in the upstream position? or is it just for the purpose of isolation without having any hard and fast rule on where it should it be located?

 

Thanks in advance.

Sanjay



#2 fallah

fallah

    Gold Member

  • ChE Plus Subscriber
  • 4,629 posts

Posted 30 April 2018 - 06:26 AM

Sanjay,

 

In drainage configuration of the liquefied petroleum gases and hydrocarbon gases the isolation valves (normally ball type) should be located upstream of the globe valve with a minimum distance of 600 mm to avoid stuck open/close of the isolation valve due to J-T effects; but may be applied to all services for simplification and uniformity.



#3 christopherchoa

christopherchoa

    Gold Member

  • Members
  • 50 posts

Posted 01 May 2018 - 05:31 PM

Here is a supporting document for Fallah's recommendation.

 

https://www.linkedin...d-rahimi-mofrad






Similar Topics