4 replies to this topic

[panagiotis_e]

Good evening everyone,

 

Can you please tell me if there are any standards/ best practices when determining the required depressurization rate/duration for a (gaseous!) hydrogen storage tank? 

 

Please keep in mind, this is not for a rupture/jet fire scenario, for which I am aware of API521; this is controlled depressurization, in order to empty the vessel so that it can be maintained.

 

Storage pressure is at 200 barg.

 

How would you approach this? Any input welcome.

 

Thank you very much!

 

Kind regards,

Panos

Edited by panagiotis_e, 11 July 2024 - 09:11 AM.

[breizh]

Hi,

You may consider the spreadsheet attached I prepared years ago.

Note:

we have no idea about the volume you want to depressurize. Make sure to drop the pressure as much as you can through your process line before maintenance to save time and integrity of your tank.

Another concern: where are releasing the material? to flare system or .....? This will affect the time required .

 

Good luck

Breizh 

 

Attached Files

•  depressurization rev1.xlsx   61.09KB   36 downloads

[shvet1]

what meaintenance does this vessel require?

[panagiotis_e]

Hi,

You may consider the spreadsheet attached I prepared years ago.

Note:

we have no idea about the volume you want to depressurize. Make sure to drop the pressure as much as you can through your process line before maintenance to save time and integrity of your tank.

Another concern: where are releasing the material? to flare system or .....? This will affect the time required .

 

Good luck

Breizh 

 

Good morning, thank you very much for the input!

 

Approximate volume of vessel is 6,600 m3, and there is a connection to flare, yes.

 

Is there some other consideration I should take into account, based on the above?

 

Thank you very much again.

 

Kind regards,

Panos

Edited by panagiotis_e, 12 July 2024 - 01:30 AM.

[breizh]

Hi,

Not knowing the temperature but assuming 20C, you have about 100 tons in your storage tank.

As I wrote, do the necessary work to convert this material in your process prior to transfer the remaining to the flare.

BTW check the capacity of your flare (paperwork or records), this will tell you how long it will take to burn the Hydrogen. 

Breizh