Sawsan311
Chemical
- Jun 21, 2019
- 303
Dear All,
considering the scenarios where the flare header would experience a vacuum air ingress conditions due to the fast cooling/quenching after a hot relief passing through the header.. the air ingress would be significant enough to preclude the reliance on normal purge rates considered for continous purging during normal operation.
From your experience, are there any rules of thumb for estimating the emergency purge rate.. does it require a dynamic simulation for modeling the hot relief as was the cooling rate followed by the low pressure occurrence which activates the purging medium automatically. Instead, shall we consider 10 times of the flare header and stack volume or there is another rough criteria.
thanks
regards,
considering the scenarios where the flare header would experience a vacuum air ingress conditions due to the fast cooling/quenching after a hot relief passing through the header.. the air ingress would be significant enough to preclude the reliance on normal purge rates considered for continous purging during normal operation.
From your experience, are there any rules of thumb for estimating the emergency purge rate.. does it require a dynamic simulation for modeling the hot relief as was the cooling rate followed by the low pressure occurrence which activates the purging medium automatically. Instead, shall we consider 10 times of the flare header and stack volume or there is another rough criteria.
thanks
regards,
