Dear All,
I am new to this safty valve field, Please let me know the term "Fire releif" use for what conditions. I have to specify what protection from loss of containment is required for hydrogen contained line.
Mahnaya
Full Version: Fire Safety Relief Valves
Mahnaya,
Welcome.
"Fire relief" is referred to overpressure of pressure containment part which expose to fire attack and subsequent relief (caused by heat input ) to avoid further increases of pressure which potentially leads to catatrophic failure.
The relief could be
i) Liquid relief - a subcooled liquid (at relieving pressure) expansion (hydraulically) - No flashing across PRD*
ii) Boiling and/or Two-phases relief - a liquid at subcooled condition at normal operating or relieving pressure - Flashing across PRD*
iii) Gas relief
* PRD - Pressure Relief Device e.g. Pressure relief valve, rupture disc, etc
Hope this helps.
Welcome.
"Fire relief" is referred to overpressure of pressure containment part which expose to fire attack and subsequent relief (caused by heat input ) to avoid further increases of pressure which potentially leads to catatrophic failure.
The relief could be
i) Liquid relief - a subcooled liquid (at relieving pressure) expansion (hydraulically) - No flashing across PRD*
ii) Boiling and/or Two-phases relief - a liquid at subcooled condition at normal operating or relieving pressure - Flashing across PRD*
iii) Gas relief
* PRD - Pressure Relief Device e.g. Pressure relief valve, rupture disc, etc
Hope this helps.
QUOTE (JoeWong @ Feb 17 2008, 04:18 PM) 
Mahnaya,
Welcome.
"Fire relief" is referred to overpressure of pressure containment part which expose to fire attack and subsequent relief (caused by heat input ) to avoid further increases of pressure which potentially leads to catatrophic failure.
The relief could be
i) Liquid relief - a subcooled liquid (at relieving pressure) expansion (hydraulically) - No flashing across PRD*
ii) Boiling and/or Two-phases relief - a liquid at subcooled condition at normal operating or relieving pressure - Flashing across PRD*
iii) Gas relief
* PRD - Pressure Relief Device e.g. Pressure relief valve, rupture disc, etc
Hope this helps.
Welcome.
"Fire relief" is referred to overpressure of pressure containment part which expose to fire attack and subsequent relief (caused by heat input ) to avoid further increases of pressure which potentially leads to catatrophic failure.
The relief could be
i) Liquid relief - a subcooled liquid (at relieving pressure) expansion (hydraulically) - No flashing across PRD*
ii) Boiling and/or Two-phases relief - a liquid at subcooled condition at normal operating or relieving pressure - Flashing across PRD*
iii) Gas relief
* PRD - Pressure Relief Device e.g. Pressure relief valve, rupture disc, etc
Hope this helps.
Thank You Joe Wong
I understand for fire relief, PRD may used, please let me know how to get set point pressure of PRD for gas contained line to protect line as well as fire. Reference to be taken either from auto ignition or MAWP of pipe line?
mahnaya,
I guess this post will be another long post with multiple questions or question-generated-question. This kind of post will have NO END... Why am i saying this ?
Title of this post is "Fire Safety Relief Valves" which is rather general. Can be anything related to Fire. This tiltle does not tell the main context is related for fire scenario or SRV discussion. But it happened to many post and i am kind of ignoring it.
The question was centered to "Fire relief term" and "... for what conditions". And some dedicated response to this question has been provided. I can accept that the resonse may not 100% answered what you are looking for. If your question is specific, you will get a quick answer. If general, you will get general answer or you get nothing.
Somehow, your second post asking about "...set point pressure of PRD for gas contained line to protect line as well as fire" and "reference to be taken either from auto ignition or MAWP of pipe line?" which they are somehow deviate from the context of "fire relief". You next question may be "what type of PSV good for fire ?", "How to size fire relief PSV ?" "who are the vendor for fire relief PSV", "what are the heat flux to be considered ?", "How to determine the fire impingement area ?", etc...NO END...(although they are somehow related to "fire relief"). I can tellyou that the answer to these questions are VALUABLE to many members. Question within a question will be difficult to be assessed and searched. It is just like VALUABLE stuff hiding below the carpet.
If the question is specific to a particular topic as well as the answer, it will easy for other to search for the answer. If the qeustion is moving away from main context of the post, please open a new post with proper description.
Don't take above personally. There are members in this forum doing similar things. I just would like to take this opportunity to make effort for improvement. Anyway, this is just an self-effort (i have not stake in this forum) but i just want to see better post and better answer for easy search and for the benefits of ALL within our community. You and reader to this post, PLEASE IGNORE IF YOU DISAGREE WITH ME !
To answer your question :
The PRD setpoint shall be at or below the Maximum allowable working pressure (MAWP) of the pressure containing part (which is code dependent).
Above response answered this question.
...but i don't say auto-ignition will not affect the setpoint. It need further investigation...
Hope this helps.
I guess this post will be another long post with multiple questions or question-generated-question. This kind of post will have NO END... Why am i saying this ?
Title of this post is "Fire Safety Relief Valves" which is rather general. Can be anything related to Fire. This tiltle does not tell the main context is related for fire scenario or SRV discussion. But it happened to many post and i am kind of ignoring it.
The question was centered to "Fire relief term" and "... for what conditions". And some dedicated response to this question has been provided. I can accept that the resonse may not 100% answered what you are looking for. If your question is specific, you will get a quick answer. If general, you will get general answer or you get nothing.
Somehow, your second post asking about "...set point pressure of PRD for gas contained line to protect line as well as fire" and "reference to be taken either from auto ignition or MAWP of pipe line?" which they are somehow deviate from the context of "fire relief". You next question may be "what type of PSV good for fire ?", "How to size fire relief PSV ?" "who are the vendor for fire relief PSV", "what are the heat flux to be considered ?", "How to determine the fire impingement area ?", etc...NO END...(although they are somehow related to "fire relief"). I can tellyou that the answer to these questions are VALUABLE to many members. Question within a question will be difficult to be assessed and searched. It is just like VALUABLE stuff hiding below the carpet.
If the question is specific to a particular topic as well as the answer, it will easy for other to search for the answer. If the qeustion is moving away from main context of the post, please open a new post with proper description.
Don't take above personally. There are members in this forum doing similar things. I just would like to take this opportunity to make effort for improvement. Anyway, this is just an self-effort (i have not stake in this forum) but i just want to see better post and better answer for easy search and for the benefits of ALL within our community. You and reader to this post, PLEASE IGNORE IF YOU DISAGREE WITH ME !
To answer your question :
QUOTE
...please let me know how to get set point pressure of PRD for gas contained line to protect line as well as fire
The PRD setpoint shall be at or below the Maximum allowable working pressure (MAWP) of the pressure containing part (which is code dependent).
QUOTE
...Reference to be taken either from auto ignition or MAWP of pipe line?
Above response answered this question.
...but i don't say auto-ignition will not affect the setpoint. It need further investigation...
Hope this helps.
This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please click here.