Scanner Maintenance and Troubleshooting

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What is the purpose of regularly scheduled checks on safety devices in a boiler plant?

To increase the temperature of the boiler plant

To check the water level in the boiler plant

To ensure the safety and reliability of the boiler plant (correct)

To decrease the efficiency of the boiler plant

According to ASME CSD-1, how often should the flame failure detection systems be checked?

Yearly

Weekly (correct)

Daily

Monthly

When should the tests on flame failure detection systems be performed?

After the boiler has been turned off for at least 24 hours

While the boiler is operating (correct)

Only during emergency situations

During the annual maintenance shutdown

What precaution is given when testing flame safeguard devices on a boiler?

Follow the manufacturer's testing instructions Signup and view all the answers

What should operators always consult regarding the testing and maintenance of safety limit controls?

The operating manual supplied by the boiler manufacturer Signup and view all the answers

What should be done if the test for Gas Burner with Electronic Flame Rod and Continuous Pilot is successful?

Reset the combustion controls and light the main burner by slowly opening the main burner test firing valve. Signup and view all the answers

What should be the time taken for the safety shut-off valve to close when performing a specific test on a Gas Burner with an Electronic Flame Rod and Continuous Pilot?

Four seconds or less. Signup and view all the answers

What must be done before closing the pilot burner test firing valve to prevent a furnace explosion?

Close the main burner test firing valve. Signup and view all the answers

What is the response of the programmed combustion control when checking the main flame failure response?

It waits for manual reset after a post-purge period. Signup and view all the answers

What is an important maintenance practice for older programmed combustion controls using drum control sequencers?

Blow out accumulated dust occasionally. Signup and view all the answers

What is the recommended frequency for testing the low gas pressure cut-off switch according to ASME CSD-1?

Monthly Signup and view all the answers

What can be used to test airflow proving switches as per the text?

Pipe unions or three-way valves Signup and view all the answers

How often should safety and safety relief valves in a hot water heating boiler be tested, according to Table 1?

Annually Signup and view all the answers

What happens if the scanner fires excessively when exposed to ambient light, based on the text?

It must be replaced Signup and view all the answers

When should manual try lever tests be performed on safety valves in steam power boilers?

Annually, prior to start of heating season Signup and view all the answers

What is the purpose of an accumulation test for a safety valve?

To determine the installed valve capacity Signup and view all the answers

What is a similarity between an accumulation test and a pop test?

Both involve installing a calibrated pressure gauge Signup and view all the answers

According to ASME guidelines, what should be kept in service during an accumulation test?

The feedwater system Signup and view all the answers

What is the maximum acceptable pressure during an accumulation test for a boiler with a MAWP of 1200 kPa and a safety valve set to 1150 kPa?

$1258$ kPa Signup and view all the answers

What does ASME BPVC IV Part HG-400.1(e) specify regarding safety valve capacity for steam boilers?

The pressure cannot rise more than 5 psi (35 kPa) above the MAWP Signup and view all the answers

What is the purpose of conducting a pop test on a safety valve?

To check the opening and reseating pressures to identify defective valves Signup and view all the answers

Why must the safety valve not be opened with the hand lifting gear when the steam pressure is less than 75% of the set pressure?

To prevent damage to the lifting device and ensure debris is blown away from the valve seat Signup and view all the answers

What should be done if a safety valve fails to open at the required popping pressure during a pop test?

Shut off the burner and release the steam pressure slowly, then apply the try lever test Signup and view all the answers

According to ASME BPVC IV, Part HG-401.1, what should be done if a safety valve does not open in the 13 to 17 psi range (85 to 115 kPa)?

Replace the safety valve Signup and view all the answers

What is the acceptable range of reseat pressures for a low-pressure steam boiler safety valve that pops open at 95 kPa?

65 to 80 kPa Signup and view all the answers