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22 Cards in this Set
- Front
- Back
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TDS stands for what? |
Total Dissolved Solids |
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Boilers that operate above roughly _________ kPa tend to use demineralized water from a cation-anion exchange system, reverse osmosis or an evaporator. |
5000 kPa |
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The blowdown system has two valves. They should be opened and closed in the correct sequence to: 1) Carry out the blowdown accurately 2) Prevent the boiler losing level 3) Protect the valve closest to the boiler 4) Prevent a high level in the steam drum 5) Prevent excessive blowdown |
3) Protect the valve closest to the boiler |
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Boiler water having the highest total dissolved solids (TDS) content is found: 1) At the top of the steam drum 2) At the bottom of the steam drum 3) In the water wall tubes 4) At the bottom of the mud drum 5) Just below the waterline of the steam drum |
5) Just below the waterline of the steam drum |
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Before anyone enters a boiler drum or shell, the blow-off valves should be: 1) Open fully and tagged 2) Closed and locked 3) Closed 4) Lubricated for ease of operation 5) Removed completely |
2) Closed and locked
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The CBD valve is usually a: 1) Butterfly valve with a metering device 2) Needle valve with a metering device 3) Ball valve with a metering device 4) Stop/check valve with a metering device 5) Gate valve with a metering device |
2) Needle valve with a metering device |
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A blow-off tank is used to: 1) Prevent sludge from entering the boiler 2) Lower the pH of the water 3) Prevent damage to the sewer 4) Lower the dissolved solids in the water 5) Keep the condensate hot |
3) Prevent damage to the sewer |
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Blowdown guidelines can be found in: 1) ASME Section VIII 2) CSA B51 3) CSA B52 4) ASME Section VII 5) Both a and c |
5) Both a and c |
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According to the Alberta Boilers Act Regulations, what fitting is needed between the blow-off valve and the boiler if two boilers use the same blow-off tank? 1) A non-return valve 2) A steam trap 3) A check valve 4) A steam separator 5) An expansion joint |
3) A check valve |
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Water leaving a blowdown tank and entering a sewer must not exceed: 1) 45ºC 2) 75ºC 3) 50ºC 4) 80ºC 5) 65ºC |
5) 65ºC |
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When two seatless valves are used for intermittent blowdown, the operation sequence is open the: 1) Downstream valve first and close it last 2) Upstream valve first and close it last 3) Upstream valve first and close it first 4) Downstream valve first and close it first 5) Upstream valve last and close it last |
1) Downstream valve first and close it last |
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According to the Alberta Boilers Act Regulations, what must be installed between the blow-off valve of an empty boiler and the blow-off header when more than one boiler is connected to the header? 1) A globe valve 2) A ball valve 3) A stop valve 4) A steam separator 5) A check valve |
5) A check valve |
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If dissolved solids are not removed from boiler water, the result may be: 1) Steam that will be more saturated with latent heat 2) Purer steam leaving the steam drum 3) Foaming and carry-over 4) Overheating of convection zone tubes 5) Overheating of radiant zone tubes |
3) Foaming and carry-over |
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A “rule of thumb” rate of continuous blowdown is approximately: 1) 5% of steaming rate 2) 3% of steaming rate 3) 1% of steaming rate 4) 15% of steaming rate 5) 10% of steaming rate |
3) 1% of steaming rate |
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The continuous boiler water blowdown is used to: 1) Control the total suspended solids 2) Feed chemicals to the blowdown tank 3) Reduce the residual sulfite 4) Increase the residual phosphates 5) Control the total dissolved solids |
5) Control the total dissolved solids |
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Sludge is usually removed from a boiler by: 1) Blowing down the boiler using the continuous blowdown 2) Filtering the water before it leaves the boiler 3) Re-circulating it through the condenser 4) Blowing down the boiler using the bottom blowdown 5) Letting it settle into a sludge trap |
4) Blowing down the boiler using the bottom blowdown |
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The blow-off connection on a boiler is located at the: 1) Bottom of the shell in the firetube boiler 2) Water line in both firetube and watertube boilers 3) Bottom of the steam drum in a watertube boiler 4) Top of the mud drum in a watertube boiler 5) Bottom of the steam drum of a watertube boiler |
1) Bottom of the shell in the firetube boiler |
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Boiler water having the greatest concentration of suspended solids is found: 1) In the bottom of the mud drum 2) At the bottom of the steam drum 3) Just below the steam drum water line 4) In convection zone down comer tubes 5) In water wall riser tubes |
1) In the bottom of the mud drum |
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When two seatless valves are used for intermittent blowdown, the operation sequence is open the: 1) Upstream valve first and close it first 2) Upstream valve first and close it last 3) Upstream valve last and close it last 4) Downstream valve first and close it last 5) Downstream valve first and close it first |
4) Downstream valve first and close it last |
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The quick opening blow-off valve should be placed: 1) Second from the boiler 2) Nearest to the boiler 3) Furthest from the boiler 4) At the second blowdown tank 5) Between the boiler and the check valve |
2) Nearest to the boiler |
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The preferred arrangement of valves on a boiler blow-off line is: 1) One valve only; it must be a globe valve 2) A quick-opening valve closest to the boiler followed by a slow-opening 3) A quick-opening valve and a lift-check valve 4) A slow-opening valve closest to boiler followed by a quick-opening 5) Two quick-opening valves |
2) A quick-opening valve closest to the boiler followed by a slow-opening |
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A boiler blowdown system is equipped with slow and fast opening valves. The quick opening valve is placed: 1) Closest to the boiler and opened first 2) Furthest from the boiler and opened first 3) Closest to the boiler and opened last 4) Furthest from the boiler and opened last 5) On the blow-off tank |
1) Closest to the boiler and opened first |
