Thanks for the response.
To give more detail. We have trip valves which close on the inlet and outlet of the railcar on detection of the chemical in the ambient air (indicating a leak), low pressure in the unloading hoses (indicating a leaking hose) or backflow in the nitrogen pad gas system...
We are a small to midrange chemical manufacturer. We are trying to perform SIL level verification on some interlocks associated with railcar unloading. The block valves have open and closed limit switches that alarm on command disagree (ie when the valve position on the limit switches...
I posted a message on the PSV side of this forum but maybe should have posted it here becasue my question is less bout whether this will work and more about does it meet the ASME code. Rather than posting it again I am jsut going to put a link here to teh otehr forum. But I would very much...
It is fairly normal practice to put car seal open valves under PSV for maintenance purposes and it is allowed under appendix M of the ASME code.
For clarification we have not sleeved the PSV. It is common manufacturing practice for PSVs now to insert a sleeve into a standard inlet flange...
From AMSE Section VIII Division 1
“UG-135 (b)(1) The opening through all pipe, fittings, and nonreclosing pressure relief devices (if installed) between a pressure vessel and its pressure relief valve shall have at LEAST THE AREA OF THE PRESSURE RELIEF VALVE INLET.”
“M-5.6 Stop Valve(s)...
Under PSM we are required to train our operators and verify their understanding. We have set up a training and "certification" program to do this. We also have contract employees on site who perform mostly maintenance functions however there are a few who are actual operators. These operators...
