API 576: Inspection of
Pressure-Relieving Devices
PUSAT PEMBANGUNAN TENAGA
INDUSTRI
(PUSPATRI)
5th – 9th November 2007
API 576 Practice Question
56.Using the following description, pick the type pressure-relieving
devices from the list.
“The spring is fully exposed; it is used on steam boiler drums; it is
also used for general air and steam service in a refinery”
1. Rupture disc
2. Safety relief valve
3. Relief valve
4. Safety valve
API 576 Practice Question
57. Using the following description, pick the type pressure-relieving
devices from the list.
“They are used in liquid service. They have closed bonnets. They
should not be used in steam, air, gas or vapor service”
1. Rupture disc
2. Safety relief valve
3. Relief valve
4. Safety valve
API 576 Practice Question
58. Using the following description, pick the type pressure-relieving
devices from the list.
“They are used in gas or vapor service and liquid service. They have
closed bonnets. They should not be used on steam boilers. They are
used in corrosive refinery service”
1. Rupture disc
2. Safety relief valve
3. Relief valve
4. Safety valve
API 576 Practice Question
59. Using the following description, pick the type pressure-relieving
devices from the list.
“ They used in refinery process industries for gas, vapor, air or
liquids. They can be used in corrosive refinery service. They minimize
the effects of back pressure on its operation characteristic. They
should not be used as pressure control or bypass valve”
1. Safety valve
2. Balanced safety relief valve
3. Relief valve
4. Rupture disc
API 576 Practice Question
60. What is the common limitation for use on the following pressure
relief devices: Safety valve, Relief valve, Safety Relief valve,
Balanced Safety Relief valve.
1. Use in corrosive service refinery
2. Use as a pressure control or bypass valve
3. Use as on steam boilers drums or super heater
4. Use in liquid service
API 576 Practice Question
61.Which of the following in NOT a cause of a pressure relieving
devices improper performance.
1. Corrosion
2. Proper maintenance
3. Damaged seating surfaces
4. Failed spring
API 576 Practice Question
62. Why is definite time interval between inspections of pressure
relieving devices necessary?
1. To insure proper performance
2. To satisfy OSHA requirement
3. To fulfill owner user limitations
4. To meet manufacturers conditions
API 576 Practice Question
63.Which of the following is done prior to the relief valve being
dismantled?
1. Measure the diameter of the disk
2. Body wall thickness measured
3. Wire brush and paint the body
4. Weigh the valve
API 576 Practice Question
64. Which one of the following list is not an item to be checked when
a visual on-stream inspection of a pressure relieving devices?
1. Check to make sure the inlet nozzle of the valve and/or the
piping to the valve inlet is not plugged
2. Check to make sure the correct relief devices was installed
3. Check to make sure no gags, blinds, closed valves or piping
obstruction prevent the relief device from working
4. Check to make sure the seals installed to protect the spring
setting have not been broken
API 576 Practice Question
65.When a pressure relief valve is first received in the shop. What
should be done?
1. Dismantle and clean the valve
2. Check the valve spring for corrosion
3. Dip the valve in a cleaning solution
4. Test pop the valve to determine the “ as received” relieving
pressure.
API 576 Practice Question
100. For bulged metal rupture disc installed with pressure on concave
side, the operating pressure of the vessel is usually limited to what
percentage of the set bursting pressure?
1. 50-75
2. 95
3. 65-85
4. 60
API 576 Practice Question
102. Where is the set pressure of pressure relieving devices indicated?
1. On the identification tag and in the historical record
2. In the specification record and historical record
3. On the identification tag
4. None of the above
API 576 Practice Question
90. What happens when a pressure relief device spring breaks?
1. Uncontrolled valve opening occurs
2. There is a slight reduction in set pressure
3. The valve cannot open
4. Nothing
API 576 Practice Question
3. The optical precision that must be maintained in the flatness of
seating surfaces on metal-seated pressure relief valves is ________.
1. 4 light beads/band
2. 0.0000349 in.
3. 0.0008838 mm
4. None of the above
API 576 Practice Question
5. Frequency of shop inspection/overhaul is determined by three
bases. Which one depends on the time necessary to maintain the
device in satisfactory condition?
API 576 Practice Question
6. Spring failures occurs in two forms. One of these is?
1. Weakening
2. Stress corrosion cracking
3. Twisting
4. Corrosion
API 576 Practice Question
7. CDTP is defined as:
1. Commercial design test pressure
2. Closing design test pressure
3. Cold differential test pressure
4. None of the above
API 576 Practice Question
8. Conventional domed rupture disc of flat seat design generally
provide a satisfactory life when operating condition are at what
percentage or less of the rated bursting pressure?
1. 80
2. 65
3. 50
4. 70
API 576 Practice Question
10. The maximum interval for visual on stream inspection
1. Ten years
2. At the discretion of owner user
3. Five years
4. annual
API 576 Practice Question
11. What would you do if a valve fails to open within the set pressure
tolerance?
1. Notify the owner/user
2. Immediately correct the condition
3. Have the operations personnel watch it
4. Nothing
API 576 Practice Question
12. A definite time interval between inspection and tests should be
established for every pressure relieving device. What is the maximum
interval permitted?
1. 10 years
2. That established by the authorized inspector
3. 5 years
4. 20 years
API 576 Practice Question
API 576 Practice Question
API 576 Practice Question
