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

Piping Steaming-Out

piping steaming-out

2 replies to this topic
Share this topic:
| More

#1 IntotheDream

IntotheDream

    Brand New Member

  • Members
  • 1 posts

Posted 30 July 2017 - 07:59 PM

Nice to meet legendary engineers in Cheresources. I am now working in refinery of South Korea. It is second year as a operation engineer so there are a lot of query to deal with about refinery.

 

As one of them, I got a question about a criteria of Piping steaming-out

 

As far as I know, There are two main purpose of piping steaming-out.
1. O2 freeing 2. Hydrocarbon stripping
 
In the case of O2 freeing criteria, it is commonly known as a rule of thumbs that O2 freeing is applied about 5-6 times of system volume. Do you know the criteria for hydro-carbon stripping? Any reference or rule of thumbs would be appreciated. Thank you in advance for your answers. 


#2 ankur2061

ankur2061

    Gold Member

  • Forum Moderator
  • 2,484 posts

Posted 30 July 2017 - 11:16 PM

Hi,

 

The thumb rule for hydrocarbon purging using steam or any other inert medium is to provide a quantity which is 8 times the system volume (piping or equipment) to ensure that the system is completely purged of any flammable hydrocarbons which can cause internal deflagration and in a worst case scenario an internal detonation.

 

Reference for the 8 times are difficult to find. Since purging with 8 times the system volume has worked successfully, and practically trying to determine the purge volume doesn't much make sense, since during start-ups and commissioning enough utilities are available for such operation, I guess it is not a worth while activity. There is a major exception although, of long distance pipelines, where purging requires detailed calculations for purge gas, since this involves large system volumes.

 

Regards,

Ankur.



#3 breizh

breizh

    Gold Member

  • ChE Plus Subscriber
  • 4,237 posts

Posted 31 July 2017 - 05:54 AM

Hi ,

Consider the use of an explosimeter well calibrated to monitor the quality of the steam out ,

 

my view .

Breizh






Similar Topics