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WHAT IS THE MINIMUM POSITIVE PRESSURE OF FLARE SYSTEM WHITOUT WATER SEAL ( GAS SEAL ) ?
VERY TRULY YOURS
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Flare System
Started by Guest_mohamad_farzaneh_*, Aug 01 2005 09:44 AM
5 replies to this topic
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#1
Guest_mohamad_farzaneh_*
Guest_mohamad_farzaneh_*
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Posted 01 August 2005 - 09:44 AM
DEAR ALL
WHAT IS THE MINIMUM POSITIVE PRESSURE OF FLARE SYSTEM WHITOUT WATER SEAL ( GAS SEAL ) ?
VERY TRULY YOURS
#2
sgkim
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Posted 22 August 2005 - 01:21 AM
Even with the water seal and gas seal, the oxygen content in the flare header should be maintained below 6 vol% as recommended by API. If no sweep(purge) gas is supplied, the flare header may be exposed to vacuum condition, then the air may possibly infiltrate into the header or back-mixed with the hydrocarbon vapors from flare tips, which would be dangerous state due to a possible disastrous explosion. Refer to API RP521.
Stefano/050822
Stefano/050822
#3
Guest_Guest_*
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Posted 22 August 2005 - 09:58 PM
QUOTE (sgkim @ Aug 22 2005, 01:21 AM)
Even with the water seal and gas seal, the oxygen content in the flare header should be maintained below 6 vol% as recommended by API. If no sweep(purge) gas is supplied, the flare header may be exposed to vacuum condition, then the air may possibly infiltrate into the header or back-mixed with the hydrocarbon vapors from flare tips, which would be dangerous state due to a possible disastrous explosion. Refer to API RP521.
Stefano/050822
Stefano/050822
#4
Guest_Farzaneh@khangiran.com_*
Guest_Farzaneh@khangiran.com_*
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Posted 15 November 2005 - 09:48 AM
tanks
I think sweep gad differ from purge gas
purge gas is injected for priventing flash back from tip
but sweep gas is inject at the end of branch flare header for making positive pressure in flare system
what is your idea about positive pressure in gas seal flare ? because water seal drum makes positive pressure.
another question : In which condition may deflagration occure in the flare system without water seal drum ?
I think sweep gad differ from purge gas
purge gas is injected for priventing flash back from tip
but sweep gas is inject at the end of branch flare header for making positive pressure in flare system
what is your idea about positive pressure in gas seal flare ? because water seal drum makes positive pressure.
another question : In which condition may deflagration occure in the flare system without water seal drum ?
#5
Guest_Guest_*
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Posted 17 November 2005 - 02:54 PM
The "minimum pressure" to prevent backflash into the flare system is above atmospheric. You will likely not even be able to measure this pressure, so it is unimportant. What is important is the minimum velocity of gas through the flare tip. This is what will prevent air from diffusing back into the flare system. The velocity is not very high but the volume of gas required increases with the diameter of the flare stack.
#6
Guest_Habib Ahmad_*
Guest_Habib Ahmad_*
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Posted 21 December 2005 - 11:08 PM
The minimum velocity of purge gas for positive pressure in flare system is 0.3M/sec( 1 Ft/S).
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