Test Your Knowledge
Test Your Knowledge
Pressure Relief Valve Knowledge Check
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A PRV spring which exhibits fine branched cracks is likely to fail by ?
Bending and locking of the PRV spindle
Weakening until the PRV won’t
Stiffening until the PRV won’t open
When removing a PRV bonnet nut you find that instead of the nut coming off the stud, the stud screws out of the body casting. How would you check if the female thread in the body casting is worn?
Use a plug gauge
Screw in the old stud and check wobble
Use a thread gauge
Use a die nut
What is the tolerance on set pressure of a PRV to be set to lift at 300psi?
On a PRV test rig, the check for seat leakage is carried out;
During the pop test, up to 100% CDTP
Before the pop test, at 90% CDTP
During the pop test, up to 90% CDTP
After the pop test, at 90% CDTP
API codes are not legally binding in countries outside the USA,however they are a useful form of reference.What does the PRV inspection/maintenance code API 576 recommend as an overall maximum in
Worn PRV nozzles can be difficult to remove and are sometimes machined insitu to repair the seating face after chattering damage etc. What is the problem if the nozzle seat is machined back too far?
The PRV may stick
The blowdown cannot be set accurately
The PRV may lift too ‘light’
The PRV may lift too ‘heavy’
When reassembling a PRV with stainless steel internals, what type of grease should be used?
What is the maximum statutory (legal) period allowed between steam-service pressure relieving device inspections in the UK?
12m for PRVs, 24m for bursti
There isn’t one
Which of these cannot be determined during a pop test on a test rig?
All of the above
How would you straighten a PRV spindle that shows excessive runout?
Squeeze it in a vice
Tap it with a hide or copper mallet
Machine it in a lathe
You can’t; it needs to be replaced
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