Term
| A boiler is equipped with one safety valve, where will it be set to blow? |
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Definition
| At or below the Max Allowable Working Pressure |
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Term
| A boiler is equipped with three safety valves, where can they be set? |
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Definition
| One valve would be set at or below the M.A.W.P., one could be set 3% above the M.A.W.P., and the third would be within 10% of the highest set safety valve. |
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Term
| Where is the super heater safety valve set? |
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Definition
| The super heater safety valve is the lowest set safety valve to assure flow through the super heater to prevent overheating |
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Term
| Name three methods used to determine the minimum safety valve relieving capacity |
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Definition
| Table PG-70 (Code constants), Code formula(W= CxHx.75) divided by 1100), Accumulation test, and by measuring the maximum evaporative capacity of the feed water |
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Term
| Why does a safety valve pop open? |
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Definition
| due to the huddling chamber, i.e. an increased area of the disk is subjected to high pressure steam quickly overcoming spring tension |
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Term
| What type of valve(s) are permitted between the boiler and the safety valve? |
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Definition
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Term
| How are soot blowers classified? |
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Definition
| Retractable or Stationary |
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Term
| What precautions should be taken prior to soot blowing? |
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Definition
| Increase air flow, drain steam lines to soot blower(s), blow soot from the furnace outward |
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Term
| How are opacity excursions handled during soot blowing? |
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Definition
| stop blowing soot and proceed slowly to avoid further excursions |
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Term
| If you fail a written exam, when can you apply again? |
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Definition
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Term
| What is the purpose of a steam trap? |
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Definition
| Increase overall efficiency by removing air and water from steam lines without a loss of steam |
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Term
| Name three types of steam traps |
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Definition
| Inverted Bucket, Flat & Thermostatic (F&T), Thermodynamic |
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Term
| Describe the operation of any single steam trap |
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Definition
| Thermostatic: A temperature sensitive bi-metallic strip opens and closes a valve. It reacts to the difference in temperature between the steam and condensate and closes due to Live Steam |
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Term
| How would you know a steam trap was not working? |
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Definition
| Steam process not working, trap not cycling, low or no temperature differential across the trap, high temperature condensate returns |
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Term
| If you fail a written exam, how soon can you apply again? |
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Definition
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Term
| Where is a non-return valve located? |
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Definition
| As close to the boiler as possible |
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Term
| Explain how you would find the true water level |
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Definition
| Open drain to water column and close, Open gauge glass drain and blow out the top and bottom gauge glass connections independently and close gauge glass drain. Check water level with tri-cocks |
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Term
| How often must air tanks be inspected? |
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Definition
| Air tanks operating at 50PSI and above should be inspected every two years |
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Term
| How often should high pressure boilers be blown down? |
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Definition
| At least once a day, it is better to base the blow down frequency on water analysis |
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Term
| Can you stop a safety valve from chattering by taking up on the adjusting nut? |
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Definition
| You should not. Only be made by the manufacturer or his authorized representative |
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