HazGas
Chemical
- Oct 26, 2005
- 11
Hello. I am doing some safety engineering work for an aerospace customer. They have a large high pressure gaseous hydrogen storage area that feeds other facilities. There is a large relief valve on the pipeline, as required by code. The RV dumps into a ~20 foot tall vent stack.
NASA Recommended practice is to flare when hydrogen venting flow rate exceeds 0.5 lb/s. If this RV went off it would flow about 2 lb/s. There is understandably some push back on installing a flare stack and propane system solely in case a relief valve goes off -- the facility is not commonly staffed but people do go there and there are no other flares or headers going to a flare anywhere nearby. So it would be an all new construction at considerable expense.
We decided that some benchmarking was in order. So I am trying to understand what other industries do in this kind of situation. Thanks in advance.
NASA Recommended practice is to flare when hydrogen venting flow rate exceeds 0.5 lb/s. If this RV went off it would flow about 2 lb/s. There is understandably some push back on installing a flare stack and propane system solely in case a relief valve goes off -- the facility is not commonly staffed but people do go there and there are no other flares or headers going to a flare anywhere nearby. So it would be an all new construction at considerable expense.
We decided that some benchmarking was in order. So I am trying to understand what other industries do in this kind of situation. Thanks in advance.