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

Sour Water Pipe Line Thickness Loss


This topic has been archived. This means that you cannot reply to this topic.
6 replies to this topic
Share this topic:
| More

#1 Pronab

Pronab

    Gold Member

  • Members
  • 163 posts

Posted 20 May 2016 - 02:02 AM

One of the sour water filter PSV down steream(D/S) and it's by-pass line having severe corrosion. The pipe line has a nominal wall thickness of 5.54 mm and now it is measured only 1.1 mm (4.44 mm loss due to corrosion). Since the line is D/S of PSV and it's by-pass, the line is not used (used when PSV pop-up) and also since the D/S pipe line join with the inlet header, it is not easly repairable unless a total shut down. I want to know how to avoid this type of corrosion as a proactive measures for other pipe line. Even if we open by-pass line manually at regular interval what about PSV discharge line.

 

Thanks in advance.



#2 fallah

fallah

    Gold Member

  • ChE Plus Subscriber
  • 4,930 posts

Posted 21 May 2016 - 03:21 AM

pronab,

 

Can you upload a simple sketch of the system you described...? It would be more helpful than the mentioned description in order to submit proper response to your query...



#3 Pronab

Pronab

    Gold Member

  • Members
  • 163 posts

Posted 21 May 2016 - 10:01 AM

Attached File  Sour water.pdf   1.03MB   27 downloads

 

 

This line is not used unless PSV pop-up. In the Filter-B, PSV D/S not found so much loss.

Sour water contains acid gas components mainly CO, H2S.


Edited by pronab, 21 May 2016 - 10:04 AM.


#4 fallah

fallah

    Gold Member

  • ChE Plus Subscriber
  • 4,930 posts

Posted 21 May 2016 - 12:36 PM

pronab,

 

When discharge of PSV on filter-B can be terminated to the atmosphere, why that of the filter-A cannot?



#5 CheAmine

CheAmine

    Junior Member

  • Members
  • 26 posts

Posted 27 May 2016 - 02:13 AM

Fallah,

I believe discharge of PSV located in filter B is also connected to the flare header. It seems like each filter is designed for 100 %, thats why each filter is having one PSV only.

Pronab,

Is there any possibility of PSV continuously passing leading to corrosion in the discharge piping ? In such sour conditions cant we put rupture disks upstream of these PSVs similar to Rich Amine flash drum PSVs ?!

Amine

#6 fallah

fallah

    Gold Member

  • ChE Plus Subscriber
  • 4,930 posts

Posted 27 May 2016 - 03:41 AM

Fallah,

I believe discharge of PSV located in filter B is also connected to the flare header. It seems like each filter is designed for 100 %, thats why each filter is having one PSV only.

Pronab,

Is there any possibility of PSV continuously passing leading to corrosion in the discharge piping ? In such sour conditions cant we put rupture disks upstream of these PSVs similar to Rich Amine flash drum PSVs ?!

Amine

 

Amine,

 

1-Please let the OP clarify about the termination of PSV discharge located on filter-B...

 

2-The severe corrosion per OP statement is at PSV downstream; then putting rupture disk at PSV upstream wouldn't remove the problem...
 



#7 Pronab

Pronab

    Gold Member

  • Members
  • 163 posts

Posted 27 May 2016 - 06:22 AM

Amine:

Both the filter PSV discharge is connected to the sour water I/L line of feed drum (As you can see in the drawing). I just mention one PSV(for A filter). Feed drum is connected to the Acid gas flare, should any acid gas flassh route to flare. However we didn't find any PSV pop-up or passing problem, It is become dead end. Accumulated sludges are found down stream of PSV. Agree with Fallah, additionally I don't think rupture disc is required here in low pressure service.

 

Regards.






Similar Topics