tenac
Chemical
- Oct 8, 2005
- 7
We have a couple of gas/liquid separators. We calculated relief requirements due to fire considering the wetted surface heat absorption rate (API 521 eq. 3).
Were wondering about the possibility that the liquid could completely evaporate. After that, expanding vapour would have to be relieved (e.g.: API 521 eq. 8).
In some cases, this can lead to larger orifice sizes...
Has anyone heard about this design practice??? All companies I know determine wheter there is wetted or unwetted surface and 'stick' to that selection.
Of course, if there are possibilities of having vessels emptied (some scrubbers) we would consider the largest of both relief requirements, but this would not occur during normal operation for this vessels.
Thanks a lot.
Were wondering about the possibility that the liquid could completely evaporate. After that, expanding vapour would have to be relieved (e.g.: API 521 eq. 8).
In some cases, this can lead to larger orifice sizes...
Has anyone heard about this design practice??? All companies I know determine wheter there is wetted or unwetted surface and 'stick' to that selection.
Of course, if there are possibilities of having vessels emptied (some scrubbers) we would consider the largest of both relief requirements, but this would not occur during normal operation for this vessels.
Thanks a lot.