risky1
Mechanical
- Jul 22, 2009
- 1
Today I was asked this question.
"I’m looking at making some changes to the piping of the Pretreatment tanks. Essentially, the proposal is to add a T-piece on the Pressure Safety Valve line, which will allow us to insert a 1” thermowell into the 1.5” line while still leaving the PSV connected. I’ve included a rough sketch of what I’m talking about.
My concern here is that including this thermowell would fill too much of the space in the line leading to the PSV. This would result in a slower depressurization if the PSV were to pop open. This wouldn’t block access to the PSV, but I’m not aware if there are any regulations about how quickly a PSV must depressurize.
Is this a regulation you know or could find out? If not, do you know if we have anybody here who is qualified to make this call from a safety perspective?"
I have attached the sketch given to me. If any one has any advise I would appreciate it.
"I’m looking at making some changes to the piping of the Pretreatment tanks. Essentially, the proposal is to add a T-piece on the Pressure Safety Valve line, which will allow us to insert a 1” thermowell into the 1.5” line while still leaving the PSV connected. I’ve included a rough sketch of what I’m talking about.
My concern here is that including this thermowell would fill too much of the space in the line leading to the PSV. This would result in a slower depressurization if the PSV were to pop open. This wouldn’t block access to the PSV, but I’m not aware if there are any regulations about how quickly a PSV must depressurize.
Is this a regulation you know or could find out? If not, do you know if we have anybody here who is qualified to make this call from a safety perspective?"
I have attached the sketch given to me. If any one has any advise I would appreciate it.