Test Your knowledge on Pressure Relief Valve – Online Quiz

Pressure Relief Valve is important piece in any plants Chemical Process Safety. It acts as an independent layer of protection offering safety against over pressure in vessels and pipelines. This Online Quiz module on Pressure Relief Valve helps you to focus on different aspects in Selection, Sizing, Installation and other practical aspects. Download your certificate also after completion of quiz.

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1.
Relief Valve in gas service has to be mounted

Horizontally

Vertically

2.
Deadhead protection relief device in discharge side is required for

Positive Displacement Pump

Reciprocating Compressor

Steam Turbine

All of the above

None of the above

3.
The relief used in the liquid system which is blocked by isolation valves at both ends is Fire Relief

Thermal Relief

Vacuum Relief

None of the Above

4.
Accumulation of Safety valve is the difference between

Set pressure and Reseating Pressure

Set pressure and Operating pressure

Set pressure and Vessel Design pressure

Reseating Pressure and Operating pressure

5.
The device used to prevent the relief valve from opening is called

Disc Holder

Test Gag

Cap

Spring

6.
Chatter is the process of

Opening of Relief Valve

Closing of Relief Valve

Continuous Rapid Opening and Closing of Relief Valve

None of the above

7.
Which one of the following is True?

Relief Valve Pops, Safety Valve gradually opens with respect to pressure raise

Safety Valve Pops, Relief Valve gradually opens with respect to pressure raise

Both Safety and Relief Valves will pop

Both Safety and Relief Valves will pop gradually opens with respect to pressure raise

8.
Which one of the following scenario will result in over pressure?

Blocked Outlet

Loss of Cooling

Ruptured Exchanger Tube

All of the above

9.
Which one of the following is True?

Relief inlet flange is larger than the outlet flange size

Relief outlet flange is larger than the inlet flange size

10.
When multiple relief with staggering arrangement is required?

MAWP is greater than 200 bar

For all Liquid service

When standard pressure relief valve size is not adequate to meet the requirement

None of the above

11.
Cold differential test pressure equal to

Required Installed Set Pressure

Required Installed Set Pressure – constant Back Pressure

Set Pressure

Maximum Allowable Working Pressure

12.
Block valves at Relief inlet and outlet must be kept …………………… during normal operation

Inlet open, Outlet close

Inlet Close, Outlet open

Inlet open, outlet open

Inlet Close, Outlet Close

13.
For blowdown as low as 2% which type of Relieving device is recommended?

Safety Valve

Rupture Disc

Pilot operated Pressure Relief valve

Rupture Disc with Pressure Relief Valve

14.
Reason(s) for Relief Valve Chattering

Inlet Pipe of Relief is smaller than Relief Inlet Nozzle

Line Plugging

Too many fittings/bends in inlet pipe

All of the Above

15.
Choose the Correct Answer

A) During Relief Valve Chattering, disc contacts the relief valve seat
B) During Relief Valve Fluttering, disc contacts the relief valve seat
C) During Relief Valve Chattering, disc doesn’t come into contact with the relief valve seat
D) During Relief Valve Fluttering, disc doesn’t come into contact with the relief valve seat

Both A & B

Both A & C

Both A & D

Both B & C

16.
Blowdown of Pressure Relief Valve is

Equal to Set Pressure of Relief valve

Difference between set pressure and reseating pressure of a safety valve expressed as a percentage of set pressure

Equal to Reseating Pressure

None of the above

17.
Which bonnet type is preferred in Styrene gas application?

Open Bonnet

Closed Bonnet

18.
Rupture Disc installed in series with Relief Valve for

Steam Application

Hot Water Application

Corrosive Application

All of the above

19.
Calculate the Cold Differential Test Pressure Constant superimposed back pressure = 3 bar; Set Pressure = 25 bar

22 bar

28 bar

25 bar

3 bar

20.
. ASME Performance Test Code for Pressure Relief Devices is

ASME PTC 10

ASME PTC 25

ASME PTC 22

ASME PTC 6

21.
. Which one of the following Orifice Type has the large effective Orifice Area?

D

E

M

P

22.
Which is the API standard used for Sizing, Selection, and Installation of Pressure-relieving Devices

API STANDARD 610

API STANDARD 611

API STANDARD 520

API STANDARD 618

23.
A test gag shall be used

During hydrostatic testing of the protected equipment

During Normal Operation

During installation

All of the above

24.
Maximum Seat Leakage Rate for a Soft Seated Pressure Relief Valve

0 bubbbles/min

20 bubbbles/min

60 bubbbles/min

100 bubbbles/min

25.
In Pressure Relief Valve Sizing & Selection, Choose the correct answer

Calculated Orifice Area > Selected Effective Orifice Area

Calculated Orifice Area < Selected Effective Orifice Area

26.
Low Pressure Storage Tanks require

Pressure Relief Device

Vacuum Relief Device

Both Vacuum & Pressure Relief Device

None of these

27.
A Pressure Relief Valve in Steam Turbine Exhaust is used for

Thermal Expansion

Control Valve Failure

Deadhead Protection

All of these

28.
Possible Causes for Tank Overpressure

Liquid movement into a tank

Liquid overfill

Exothermic chemical reactions

All of the above

None of the Above

29.
To avoid condensate collection in Relief Exhaust pipe which one is preferred?

Low Point Drain

Self Draining Provision

Low Point Drain and Self Draining Provision

Low Point Drain or Self Draining Provision

30.
In Pressure reducing stations, Pressure Relief Valve is recommended in

Upstream of Control Valve

Downstream of Control Valve

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