4 replies to this topic

[mbsahg]

Hello~

 

I am studying about 'Cryogenic storage system'.

I know that ATM. tank isn't installed safety valve. But the storage tank is installed safety valve.

Why do it install to tank? Also safety outlet line connected to steam line in order to supply steam. Is it the reason? and how is the required steam flow rate calculated?

 

Thank you for reading

Have a good day~!!

[fallah]

mbsahg,

 

Your query isn't so clear...please submit it with clear description...

[Art Montemayor]

mbsahg:

 

You don't identify your name or country of origin in your personal data, so our members can't know which language you may have as your mother tongue.

 

Your English script is written in a terrible manner and is unclear to even bi-lingual, experienced professionals like Fallah.  Many of our Forum members speak, read, and write in various languages.  If you post your language preference, some of our members can help you organize your query in a manner that all of our members can understand it in English.  Unfortunately, for the time being, we only have English and Spanish Forums and no Arabic, Hindi, Chinese, French, Portuguese, Italian, German, Japanese, Korean, etc. Forums.  But there is always a way to solve a communications problem - we are all engineers and solving problems is our job.

[mbsahg]

I'm sorry.  Due to my low level of English, I wrote in simple sentences.  Therefore, I am attaching a PFD in order to introduce the storage system I refer to.  A detailed description is found below

 

Design base:

1) Fluid: Ethylene and Propylene

2) Tank type: Double wall tank

3) Operating pressure: 0.1 kg/cm²g (in the tank)

 

My questions are as follows:

 1) Why are safety valves installed on the tank?

  -  I know that atmospheric pressure storage tanks don't install safety valve. but there are safety valves on our ethylene storage tank in the referenced P&ID.   If there are any regulations (code or law), I want to know about it.

 2) Why is a line installed on the tank, on the discharge outlet of the safety valves?

  - If a safety valve activates on relief, the referenced P&ID shows a supply of steam to apply. What reason is there for this to be done?

 3) If a supply of steam is necessary, how is the required steam flow rate calculated?

 

Thank you for reading this query.

 ETHYLENE TANK PFD.pdf   87.25KB   97 downloads

Edited by Art Montemayor, 26 June 2015 - 09:13 AM.
grammar, composition, vocabulary

[CMA010]

Try to get a hold of e.g. EN 1473, API STD 625, API STD 2000