Exam Questions: Low pressure steam and mechanical safety devices

Question 1

Any person involved in the installation, removal, repair, inspection, and servicing of a pressure relief device shall

a) be trained and competent in the duties for which they are responsible
b) hold a class A certificate

Answer 1

a)

Question 2

Which of the following devices is typically used for steam or vapour service?

a) relief valve
b) a safety valve
c) a safety relief valve
d) a temperature and pressure relief valve

Answer 2

b) a safety valve

Question 3

Which of the following devices is typically used for liquid service?

a) relief valve
b) safety valve
c) safety relief valve

Answer 3

a) relief valve

Question 4

What is the usual temperature setting for a temperature and pressure relief valve?

a) 150F ( 66c)
b) 180F (82c)
c) 210F (99c)
d) 212F (100c)

Answer 4

c) 210F

Question 5

Safety, safety relief, and relief valves shall be of the ___________

a) direct spring loaded type
b) indirect spring loaded type
c) internally weighted type
d) rupture disc type

Answer 5

a) direct spring loaded type

Question 6

What type of valve may be installed between a boiler and its relief valve?

a) ball valve
b) gate valve
c) globe valve
d) no valve at all

Answer 6

d) no valve at all

Question 7

A pressure vessel is a closed container that is designed to store, transmit, or convert liquids and vaporous fluids at a pressure greater than ____psi

a) 0.5
b) 15
c) 30
d) q00

Answer 7

b) 15psi

Question 8

When a vacuum relief valve is used for low pressure steam services a __________ must be installed to prevent live steam from damaging the device

a) air eliminator
b) isolation valve
c) expansion tank
d) pigtail

Answer 8

d) pigatail

Question 9

What pressures are propane tank safety valves set at?

a) 250 or 312 psi
b) 250 or 375psi
c) 295 or 375psi
d) 312 or 375psi

Answer 9

a) 250 or 312 psi

Question 10

What pressure is a propane cylinder safety valve set at?

a) 250 psi
b) 312psi
c) 295 psi
d) 375 psi

Answer 10

d) 375psi

Question 11

What is the LNG secondary relief valve relief pressure set at?

a) same pressure as the MAWP of the tank
b) 1.5 times the MAWP of the tank
c) 2 times the MAWP of the tank
d) 2.5 times the MAWP of the tank

Answer 11

b) 1.5 times the MAWP of the tank