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20 Cards in this Set
- Front
- Back
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A firetube boiler has the flue gases ____ |
Inside the tubes. |
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A cyclone separator is found in a _____ |
Steam drum |
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The maximum pressure used in a firetube boiler is up to ____ |
350 pounds. |
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What is the difference between a watertube and a firetube boiler? |
A watertube boiler operates at pressures up to 3206 psi whereas a firetube operates at pressures up to 350 psi. A watertube boiler can use superheaters for creating superheated steam. Water flows through the tubes of a watertube boiler, firetube does not. |
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What is a superheater and what are 3 types? |
A superheater is a bank of tubes that flow through a boiler to increase the temperature of saturated steam more than the saturation temperature. Superheaters create superheated steam. The three types are convection superheaters, radiant superheaters, and combination superheaters. |
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What is the most significant loss in a boiler? |
Heat out of the stack is the most significant loss. |
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De-superheating steam is done by _____ |
Adding water to the steam. |
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What is condensate? |
Steam that has been cooled to water. |
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What is saturated steam? |
When steam and water are at the same temperature and pressure. |
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One horsepower is equal to how many pounds of steam? |
34.5 lbs./hr of evaporation at 212 degrees Fahrenheit. |
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The purpose of a safety valve is to _____ |
Keep the boiler from exceeding its MAWP. |
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The most important fitting on a boiler? |
Safety valve. |
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What overcomes the spring tension and makes the safety valve pop? |
The huddling chamber. |
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What is an accumulation test? |
A test used to determine the relief capacity of a safety valve. |
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Define a safety valve according to ASME code? |
A spring-loaded, pop-type valve that prevents a boiler from exceeding the MAWP. Designed to pop open before the pressure exceeds 6% of the MAWP. |
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How many valves are needed on a blowdown line when the pressure is over 100 psi? |
At least two, one has to be a slow opening valve. |
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To protect a boiler’s pressure gauge from live steam, it must have ______ |
A siphon. |
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What is an OS&Y valve, why is it made this way? |
An outside stem and yoke valve. It is used in main steam stop valves. It will let you know when the valve is open or closed by the position of it’s stem. |
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What is a pigtail, what is its purpose and where would you find one? |
A pigtail is a pipe siphon. You’ll find one attached to a steam pressure gauge. It prevents steam from damaging the pressure gauge. |
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Per the state of Massachusetts what can you do with a 2nd firemen license? |
To operate any boiler or boilers under the engineer or fireman in direct charge thereof. |
