Question: Sir, what is meant by inspection of pressure relieving devices? Why is it so important when doing an inspection?
A: Thanks for asking. Before i go further, i want you to look at this chart below. By understand this chart, then you’ll know why pressure relieving devices are so important while doing inspection. After that, please read about the terminology for pressure relieving devices.
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PRESSURE RELIEVING DEVICES TERMINOLOGY
- Accumulation: Increase pressure over MAWP during discharge (% of MAWP).
- Set Pressure: Difference between set Pressure and Re-Seat Pressure.
- Back Pressure: Pressure on discharge side (5 of set pressure).
- Built up Pressure: Pressure in discharge header due to frictional loss.
- Superimposed Pressure: Pressure in discharge header before valve open.
- Blowdown: Difference between Set Pressure and Re-Seat Pressure.
- Chatter: Rapid reciprocating motion of the movable parts (i.e. disk contacts with seat.
- Lift: Increase pressure over MAWP during discharge (% of MAWP).
- Over Pressure: Pressure on discharge side (% of set pressure).
- Releasing Pressure: Pressure in discharge header due to frictional loss.
- Seat tightness Pressure: Pressure in discharge header before valve open.
To be continued….
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