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Piping Steaming-Out

piping steaming-out

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#1 IntotheDream


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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


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Posted 30 July 2017 - 11:16 PM



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.




#3 breizh


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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 .


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