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32 Cards in this Set
- Front
- Back
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Safety valves "pop" open because the force of the steam a) acts upon a blowdown ring b) acts upon a huddling chamber c) is suddenly increased due to a larger area d) increases due to the discharge ports e) decreases the force created by the spring |
c) is suddenly increased due to a larger area |
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If a safety valve is too small then the boiler pressure will a) rise 5% above the maximum allowable working pressure (MAWP) b) not rise more than 15% above the MAWP c) remain at the MAWP d) rise to 6% above the MAWP e) rise more than 6% above the MAWP |
e) rise more than 6% above the MAWP |
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Boiler fittings a) are not regulated by the ASME Codes b) must be registered by the government c) requires only the manufacturer's identity attached d) may be used at the discretion of power plant personnel e) are tested by a destructive test |
b) must be registered by the government |
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It is necessary to clearly mark or identify valves and fittings so that a) they can be properly stored in the warehouse b) the manufacturer's reputation is known c) strength and material can be applied for a particular use d) the operator knows how it works e) a proper safety inventory can be maintained |
c) strength and material can be applied for a particular use |
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An agency or code with which fittings must comply with is the a) Health and Safety code b) Fittings and Boiler Parts Act c) Boiler Repair code d) Plumbing Gas Act e) ASME code |
e) ASME code |
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If a safety valve fails to open at its popping pressure, you should a) tap it gently b) try the lifting lever c) shut the boiler down d) raise the pressure e) reface the valve |
b) try the lifting lever |
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The lip on a safety valve a) allows it to close slowly b) is only required if the steam is superheated c) supplies a drain lip for condensate to collect on d) makes the valve stronger e) allows it to "pop" open |
e) allows it to "pop" open |
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What does the boiler inspector install to prevent tampering witha safety valve setting? a) a restraining order b) a gag c) a seal d) a plug e) a cover plate |
c) a seal |
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What is the maximum heating surface for a boiler to have only one safety valve? a) 75 square metres b) 47 square metres c) 36 square metres d) 28 square metres e) 19 square metres |
b) 47 square metres |
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If a boiler has a maximum allowable working pressure of 1000 kPa,what would be the maximum pressure allowed when the safetyvalve is open? a) 1060 kPa b) 1400 kPa c) 1600 kPa d) 2000 kPa e) 2500 kPa |
a) 1060 kPa |
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A stop valve is allowed between the safety valve and the boiler drum when a) the stop valve is locked open b) there is more than one safety valve c) a rupture disc is placed between the stop valve and the safety valve d) no stop valves are allowed before or after the safety valve e) the stop valve is the quick opening type |
d) no stop valves are allowed before or after the safety valve |
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Two safety valves are required on a high pressure steam boiler that has a heating surface larger than a) 12 square metres b) 40 square metres c) 47 square metres d) 45 square metres e) 27 square metres |
c) 47 square metres |
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If the boiler was fired up with the main steam stop valve closed,the safety valves should ensure that: a) the pressure cannot exceed the maximum working pressure by more than 6% b) the water glass will not burst with the pressure c) the fuel cut-off will operated) the pressure is never more than the hydrostatic test pressure e) the pressure cannot exceed the maximum working pressure by more than 3% |
a) the pressure cannot exceed the maximum working pressure by more than 6% |
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What is the minimum number of safety valves required on a boiler having a heating surface of 42 square metres? a) none b) one c) two d) three e) four |
b) one |
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Each boiler must have a safety valve, preferably a) placed in a pipe system leading from a boiler valve b) welded in a horizontal position to the top of the boiler c) fitted securely to a shut-off valve directly connected to the top of the boiler d) at eye level on the front surface of the boiler e) fitted in a vertical position directly connected to the top of the boiler |
e) fitted in a vertical position directly connected to the top of the boiler |
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The safety valves on a boiler meet code requirements and are setto a popping pressure of 1380 kPa. What would be the maximumpermissible pressure rise in the boiler, if the boiler was fired at full capacity with the main steam stop valve closed? a) 25 kPa b) 37.5 kPa c) 47 kPa d) 72.4 kPa e) 82.8 kPa |
e) 82.8 kPa |
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The discharge pipe of a safety valve should be separatelysupported a) because the safety valve is not capable of supporting the mass b) so that drainage of the discharge line can occur c) so that allowance for expansion prevents stress on the safety valve d) in order to prevent leakage at the joint e) so that the valve can be quickly and easily removed |
c) so that allowance for expansion prevents stress on the safety valve |
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Cast iron fittings for a boiler can be deemed to have upper limitations of a) 1,720 kPa and 232 degrees C b) 17,200 kPa and 1,100 degrees C c) 1,100 kPa and 173 degrees C d) 8,000 kpa and 670 degrees C e) 3,000 kPa and 150 degrees C |
a) 1,720 kPa and 232 degrees C |
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The popping pressure of a safety valve a) cannot be changed b) can only be increased by 5% c) can only be decreased by 5% d) can be increased or decreased by up to 5% e) can be changed any amount |
d) can be increased or decreased by up to 5% |
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The blowdown on a safety valve is adjusted by turning the a) inspector's seal b) valve disc c) adjusting nut d) adjusting ring e) valve seat |
d) adjusting ring |
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A blowdown ring on a safety valve is used to a) adjust the operating pressure of the valve b) set the opening pressure c) increase the effectiveness of the safety valve d) increase the life of the cone shaped lip e) adjust the blowdown differential |
e) adjust the blowdown differential |
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A try lever safety valve test will a) ensure the popping pressure is correct b) indicate that valve capacity is adequate c) ensure the closing pressure is correct d) take approximately 2 seconds e) ensure the valve is free to operate |
e) ensure the valve is free to operate |
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When performing a safety valve pop test one of the firstthings to do is a) notify the boiler inspector b) verify the accuracy of the applicable steam pressure gage c) notify the chief engineer d) check the blowdown of the safety valve e) check the popping pressure |
b) verify the accuracy of the applicable steam pressure gage |
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A safety relief valve is like a safety valve except it a) does not have a blowdown ring or bottom guides b) must have greater blowdown c) may have an isolation valve placed between it and the pressure vessel d) must discharge directly to the atmosphere e) is prone to leakage |
a) does not have a blowdown ring or bottom guides |
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Temperature relief valves can open on a rise in temperature by the expansion of a wax-filled rod or by the a) melting of the alloy in a fusible plug b) melting of a fusible link c) action of a bi-metal strip d) action of a Bourdon tube e) action of a bellows |
a) melting of the alloy in a fusible plug |
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If the safety valve starts to leak steam a) phone the inspector immediately b) report it to the insurance company c) pull the test lever and try to clear the seat face d) break the seal, and tighten down on the spring e) adjust the blowdown of the safety valve |
c) pull the test lever and try to clear the seat face |
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An operator should check that a boiler safety valve will open at its set pressure by a) sending for the inspector to bring his or her test gauge b) increasing the boiler pressure until the valve opens and noting the pressure on the pressure gauge when the valve opened c) putting a piece of pipe over the lifting lever and lifting the valve off its seat when the seat pressure is reached d) connecting the boiler to an air compressor during shut down and raising the pressure in the boiler until the set pressure is reached e) listening to the alarms of the set pressures |
b) increasing the boiler pressure until the valve opens and noting the pressure on the pressure gauge when the valve opened |
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Testing the safety valve by means of the try lever method is considered good practice when carried out on a a) weekly basis b) monthly basis c) six month basis d) yearly basis e) bi-weekly basis |
b) monthly basis |
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If, during the testing of a safety valve, the valve does not open, you would first a) continue to increase the steam pressure b) try to open the valve with the lifting lever c) force it open by striking it with a hammer d) take the boiler out of service e) stop the boiler and notify the boiler branch |
b) try to open the valve with the lifting lever |
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Test levers on safety valves should not be used until the boiler pressure is at least _________ or more of the safety valves normal popping pressure. a) 75% b) 60% c) 50% d) 40% e) 25% |
a) 75% |
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If a safety valve leaks after a try lever test, the operator should a) plug the safety valve outlet b) reduce the boiler pressure c) operate the try lever several times to blow away foreign material d) fit a gag to the safety valve e) reduce boiler pressure and call the team leader |
c) operate the try lever several times to blow away foreign material |
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Do not open the safety valve with the test lever a) if the valve is less than 2.5 cm inlet diameter b) if the pressure is less than 75% working pressure c) after 9 p.m. in populated areas d) if the valve is not vented to the roof e) if there are more than two safety valves on the boiler |
b) if the pressure is less than 75% working pressure |
