Term
| List 4 methods used to classify boiler types |
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Definition
1. Direction of axis
2. According to use
3. Location of furnace
4. Operating Pressure
5. Fire tube/Water Tube |
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Term
| What is a fire tube boiler? |
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Definition
| Has the products of combustion inside the tubes which are surrounded by water |
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Term
| What is a water tube boiler? |
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Definition
| Boiler in which water circulates in tubes heated externally by the products of combustion |
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Term
| What is the difference between a dry-top vertical boiler and a wet-top vertical boiler? |
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Definition
| Dry-top vertical boiler has tubes which extend beyond the normal operating water level. Wet-top vertical the tubes are completley submerged by water. |
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Term
| What does H.R.T. stand for? |
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Definition
| Horizontal Return Tubular |
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Term
| why are H.R.T. boilers sloped to the rear head? |
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Definition
| So the sludge will be at an angle and can be easily removed by opening the blow off valve |
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Term
| Name two methods used to support H.R.T. boilers |
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Definition
| Sitting on the brick structure with lugs and rollers, or by overhead suspension from large beams |
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Term
| Name two types of Scotch Marine boilers |
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Definition
| Stationary service or Dry Back and Marine service or wet back |
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Term
| What is the primary difference between an H.R.T. and a Scotch Marine boiler? |
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Definition
| H.R.T.'s are externally fired while Scotch Marine's are internally fired |
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Term
| Name 5 advantages of a fire tube package boiler |
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Definition
| Low Cost, Turnkey Operation, Limited Space Requirements, No Setting, Automatic Operation. |
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Term
| How are water tube boilers classified? |
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Definition
| As straight tube, bent tube and/or the number of drums: multiple drums, single drum, or no drum |
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Term
| Why are water tube boilers used in electric-generating plant? |
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Definition
| Unlimited capacity and almost limitless pressure capability |
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Term
| Name 5 different types of water tube boilers |
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Definition
| B+W longitudinal/cross drum, Heine boiler. Stirling boiler, Controlled Circulation, Forced Flow Circulation, Natural Circulation, Electric boilers, HRSG |
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Term
| How many pressure gauges are required on a boiler? |
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Definition
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Term
| How many safety valves are required on a boiler? |
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Definition
| At least one. Boilers operating over 500 square feet of heating surface require two or more |
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Term
| What is the purpose of a hand hole? A manhole? |
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Definition
| A hand hole is so a worker can access a part of a boiler with his hand to inspect/and or fix. A man hole is so a worker can enter the boiler to inspect and/or fix. |
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Term
| Name 3 special purpose boilers |
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Definition
| Electric boilers, Miniature boilers, Hot water boilers, Fluidized Bed Boilers |
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Term
| What does H.R.S.G. stand for? |
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Definition
| Heat Recovery Steam Generator |
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Term
| What is the longitudinal joint? A circumferential joint? |
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Definition
| Longitudinal runs the entire length of the shell/drum and is used to form a closed cylinder, a Circumferential Girth seam is used to attach heads to the formed cylinder |
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Term
| What is a water column used for? |
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Definition
| to reduce the turbulence of the water in the boiler so that an accurate level can be seen in the gauge glass. |
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