Safety and Control
Mechanical
Can any explain, Why full bore is not available in conventional(spring operated) valve?
Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations JAE on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Full bore
- Thread starter Safety and Control
- Start date
- Status
LittleInch
Petroleum
Do you mean a spring operated relief valve? ?
Be more precise.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
Be more precise.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
- Thread starter
- #3
Safety and Control
Mechanical
yes, i am asking about conventional (j-series valves)
Look through the beginning parts of API 520, it's actually quite helpful.
Relief valves are used in the worst case pressure scenario to keep your vessel from failing. In this high pressure situation, it may not be ideal to have a full bore valve suddenly open to relieve pressure; the forces and velocities of this relief event would be very high. Since the high pressure helps push things out of the system, you can use a smaller orifice area and moderate the flow to what you need it to be.
Sometimes you do want that full bore relief; in that case a rupture disc is likely your best option or possibly a pilot operated relief valve.
Relief valves are used in the worst case pressure scenario to keep your vessel from failing. In this high pressure situation, it may not be ideal to have a full bore valve suddenly open to relieve pressure; the forces and velocities of this relief event would be very high. Since the high pressure helps push things out of the system, you can use a smaller orifice area and moderate the flow to what you need it to be.
Sometimes you do want that full bore relief; in that case a rupture disc is likely your best option or possibly a pilot operated relief valve.
The Obturator
Mechanical
The J Series you refer to are the "Crosby" range of spring operated pressure relief valves. These are designs meeting API-520, API 526, etc. These specifications do not cover "Full Bore" nozzles for spring operated designs, but established "letter orifice" sizes D, E......R, T" each letter having a distinct effective area.
There are other spring operated PRV designs where you can have "Full Bore" dependant on application and manufacturer, but these will generally have a lower coefficient of discharge. Many manufacturers working to European DIN/TUV specs have such designs.
Full Bore nozzles are available for pilot operated pressure relief valves and used in standard body designs.
Per ISO, only the term Safety Valve is used regardless of application or design.
There are other spring operated PRV designs where you can have "Full Bore" dependant on application and manufacturer, but these will generally have a lower coefficient of discharge. Many manufacturers working to European DIN/TUV specs have such designs.
Full Bore nozzles are available for pilot operated pressure relief valves and used in standard body designs.
Per ISO, only the term Safety Valve is used regardless of application or design.
- Thread starter
- #6
- Thread starter
- #7
Safety and Control
Mechanical
when we go for FULL BORE?
Is it better than orifice design?
Is it better than orifice design?
The Obturator
Mechanical
It's application dependant.
What is drivin this requirement?
Per ISO, only the term Safety Valve is used regardless of application or design.
What is drivin this requirement?
Per ISO, only the term Safety Valve is used regardless of application or design.
Bigger does not always mean better.
It'd be better to focus on the relief calculations and ensuring you've analyzed all scenarios properly and determined the required relief rates & orifice sizes. Once you're confident that information is correct, you can look at specific valves.
It'd be better to focus on the relief calculations and ensuring you've analyzed all scenarios properly and determined the required relief rates & orifice sizes. Once you're confident that information is correct, you can look at specific valves.
- Thread starter
- #10
The Obturator
Mechanical
Answer does not help. What is application and why is Full Bore being asked for? An orifice calculation will determine further.
Per ISO, only the term Safety Valve is used regardless of application or design.
Per ISO, only the term Safety Valve is used regardless of application or design.
- Status