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40 Cards in this Set
- Front
- Back
The main part of the firetube boiler is ___________. |
The shell |
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Shells and drums are made of steel plates. The thickness of these plates vary from _______ to _______. |
6 mm to 250 mm |
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In the case of a firetube boiler, the heads are in a ______ shape rather than a _______ shape. They are called _________. |
Flat rather than dished Tubesheets |
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In the case of a watertube boiler, the heads are in a ______ shape rather than a _______ shape. |
Dished, flat |
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Five basic welds used in boiler construction |
1. Butt joint 2. Corner joint 3. Tee joint 4. Lap joint 5. Edge joint |
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Which welding joint is primarily used in boiler construction? |
Butt joint |
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Two basic types of welds |
1. Groove weld (butt joint) 2. Fillet weld |
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During the welding processes ________ can build up in the metal. These stresses can be removed through ______ ________. |
Stress Heat treatment |
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Two types of rivited joints |
1. Lap joints 2. Butt joints |
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Three different ways of tube attachment in firetube boilers |
1. Expanded and beaded over 2. Expanded, beaded over and welded 3. Expanded, beaded over and grooved |
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Supports in boilers are called? |
Stays |
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Watertube boilers don't tend to need stays because they don't have_______. |
Flat surfaces |
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Through stay supports are attached with _____ and ______. |
Nuts and washers |
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The size of an elliptical manhole cover can't be less then _____ by _____. |
280 mm by 380 mm |
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Circular manhole covers can't be less then _______. |
380 mm |
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Handholes can't be less then _______ by ________. |
70 mm by 89 mm |
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Three types of walls in water-cooled furnace walls? |
1. Welded fin tube 2. Tangent tube wall 3. Flat stud tube wall |
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Tubes for high pressure service are usually A. Resistance welded construction B. Pierce and role construction C. Lap welded construction D. Expanded into the drum or tubesheet. |
B. Pierce and role construction |
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Name two types of Boiler tubes |
1. Resistance-welded boiler tubes 2. Seamless boiler tubes |
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With a bottom-supported boiler, the steam drum is usually: 1) Supported by an overhead girder arrangement 2) Supported by the water tubes 3) Placed between the centre line of the unit 4) A cross-drum configuration 5) Supported by piers
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2) Supported by the water tubes |
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One or more steel plates rolled into cylindrical form and welded together with the ends closed by means of end plates or heads is called a: 1) Combustion chamber 2) Steam header 3) Packaged boiler 4) Steam or water drum 5) Steam space
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4) Steam or water drum |
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The flat surfaces which require staying in a firetube boiler are the tube sheets, water legs, and: 1) Flue gas baffles 2) Uptakes 3) Crown sheets 4) Access doors 5) Furnace tubes
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3) Crown sheets |
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Head-to-drum circumferential joints are usually: 1) Double welded butt joints 2) Single welded edge joints 3) Double welded tee joints 4) Fillet welded corner joints 5) Fillet welded lap joints
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1) Double welded butt joints |
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Water walls in a boiler: 1) Are made of firetubes 2) Decrease overall boiler efficiency 3) Are part of a firetube boiler 4) Will increase the furnace temperature 5) Decrease overall boiler weight
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5) Decrease overall boiler weight |
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In firetube boilers, through or _____ stays are often used to support the area of the tube sheets below the tubes. 1) Diagonal 2) Longitudinal 3) Radial 4) Watertube 5) Gusset
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2) Longitudinal |
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Tubes for high pressure service are usually: 1) Of 2 metre maximum length 2) Roll and pierce construction 3) Lap welded construction 4) Resistance welded construction 5) Flared into the drum or tube sheet
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2) Roll and pierce construction |
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The circumferential seam of a riveted boiler shell utilized the: 1) Double equal strap double riveted butt joint 2) Lap joint, single or double riveted 3) Double unequal strap treble riveted butt joint 4) Treble riveted butt joint 5) Always a single riveted lap joint |
2) Lap joint, single or double riveted |
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Single-welded butt joints: 1) Are never used for boiler fabrication 2) Must have a double “V” groove 3) The filler metal is applied to both sides of the joint 4) The filler metal is applied from one side only 5) Are used on very thick boiler plates
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4) The filler metal is applied from one side only |
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Tube stubs welded to drums and headers, which are used for connecting fittings and attachments, are also known as: 1) Fittings 2) Manifolds 3) Flanges 4) Nipples 5) Nozzles
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5) Nozzles |
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In welding terminology, the first bead laid in a welding job is referred to as the: 1) Face 2) Reinforcement 3) Root 4) Bond 5) Toe
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3) Root |
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The advantage of a water cooled furnace is: 1) Hotter furnace temperature 2) Decreased boiler efficiency 3) Less chance of a furnace explosion 4) Less brickwork required 5) Increased air/fuel turbulence
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4) Less brickwork required |
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Another expression used to describe the expanding of tubes into a tube sheet is called: 1) Flaring 2) Thermo-elongation 3) Beading 4) Peening 5) Rolling
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5) Rolling |
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A Morison furnace is: 1) Watertube boilers 2) Locomotive boilers 3) Found in electric boilers 4) Found in firetube boilers 5) A ring-reinforced type furnace
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4) Found in firetube boilers |
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A boiler nozzle attachment: 1) Is used for steam cleaning the fireside 2) Can be found in the area of the burner 3) Is always installed vertically 4) Nearly always accommodates a valve or fitting 5) Allows a connection for the uptake
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4) Nearly always accommodates a valve or fitting |
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A Morison furnace is: 1) A ring-reinforced type furnace 2) Watertube boilers 3) Found in electric boilers 4) Locomotive boilers 5) Found in firetube boilers |
5) Found in firetube boilers |
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A tube expander is used to: 1) Expand and flare the tube 2) Break loose scale in the tube 3) Expand the entire tube 4) Bead the tube 5) Break loose scale outside the tube |
1) Expand and flare the tube |
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The circumferential seam of a riveted boiler shell utilized the: 1) Double equal strap double riveted butt joint 2) Treble riveted butt joint 3) Always a single riveted lap joint 4) Lap joint, single or double riveted 5) Double unequal strap treble riveted butt joint |
4) Lap joint, single or double riveted |
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In firetube boilers, through or _____ stays are often used to support the area of the tube sheets below the tubes. 1) Radial 2) Longitudinal 3) Watertube 4) Diagonal 5) Gusset |
2) Longitudinal |
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In firetube boilers, _____ stays are usually used to support the flat surfaces above the tubes. 1) Diagonal 2) Gusset 3) Hollow 4) Through 5) Longitudinal |
1) Diagonal |
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Radiographic pictures of welds are taken with the use of: 1) Gamma rays 2) X-rays 3) Microwaves 4) Strontium 90 5) Ultra-violet rays |
2) X-rays |