Chapter 3 Flashcards
- What is meant by the foundation of a Boiler?
A) the person who designed the Boiler B) the ground support of the Boiler C) the setting of the Boiler D) the steelwork of the Boiler E) the support beams on top of a Boiler
B) the ground support of the Boiler
- Every Boiler must be supported by a good foundation:
1) to allow for expansion
2) to avoid movement due to settling
3) to prevent extra stress in connected pipework
4) to allow accurate water indication of the Boiler
A) 1,2,3,4 B) 1,3,4 C) 2,3,4 D) 1,2 E) 2,4
E) 2,4
- Why do boilers have allowances for expansion?
1) to prevent the brickwork from cracking
2) to prevent undue stress on the pipework
3) to prevent thermal shock to the steam drum
4) because the Boiler is not always operating at the same temperature
A) 1,2,4 B) 2,3,4 C) 1,2 D) 2,4 E) 2,3
A) 1,2,4
- The Boiler pressure parts are allowed to expand _____ from the main supports at the top.
A) upwards
B) sideways
C) downwards
D) static
C) downwards
- Upon completion of the structural steel installation, the āUā shaped hangers are attached to the structural steel for support of the main steam _____.
A) header
B) drum
C) superheater
D) economizer
B) drum
- The drum is supported by U-bolts, which permit linear movement of the drum with _____ variations.
A) temperature
B) size
C) pressure
D) small
A) temperature
- The drum is used as the _____ anchor point for other Boiler components, and for this reason, accurate location is important.
A) minor
B) minimum
C) maximum
D) major
D) major
- The bottom supported Boiler has concrete drum _____, which support the bottom drum and bottom headers.
A) hangers
B) holders
C) foundations
D) feet
C) foundations
- The Boiler tubes themselves are used to support the top _____ in a bottom supported Boiler.
A) cover
B) drum
C) header
D) tubes
B) drum
- All piping and ductwork must have provision for _____.
A) expansion
B) installation
C) vibration
D) shrinkage
A) expansion
- Boiler _____ is the term used to describe the airtight metal casing Boiler wall.
A) wall
B) metal
C) casing
D) house
C) casing
- _____ is cement like. It is used to withstand very high temperatures in areas such as burner throats and Boiler target walls.
A) refractory
B) insulation
C) cladding
D) casing
A) refractory
- The use of membrane or water cooled walls has reduced the use of _____ in modern watertube boilers.
A) refractory
B) insulation
C) cladding
D) castables
D) castables
- Cladding is the metal covering, which protects the _____ surface of the Boiler.
A) inner
B) outer
C) wet
D) bottom
B) outer
- Boilertubes may be fabricated in a _____ form, or they may be welded.
A) rolled
B) seamless
C) seamed
D) cast
B) seamless
- Tubes for Boiler application are either hot finished, or _____ drawn depending on the size, tolerance, and finish desired.
A) cold
B) hot
C) mild
D) rough
A) cold
- _____ tubes have no welded joints.
A) Boiler
B) superheater
C) seamless
D) cold
C) seamless
- The function of the rolling mill is to _____ the tube and reduce the wall thickness to the approximate dimensions required.
A) smooth
B) roll
C) protect
D) lengthen
D) lengthen
- Directly after rolling and while the tube is still hot, a reeling machine is utilized to smooth the outer surface. This is called:
A) stressing
B) reeling
C) burnishing
D) smoothing
C) burnishing
- Another method used to produce seamless tubes is known as _____.
A) cold rolling
B) extrusion
C) polishing
D) casting
B) extrusion
- To form a drum or shell of the required diameter, the plates must be rolled to the correct _____.
A) thickness
B) width
C) diameter
D) curvature
D) curvature
- The automatic submerged arc welding process normally makes longitudinal and circumferential _____ in drums.
A) seams
B) welds
C) connections
D) curvature
A) seams
- Drumheads are formed from flat plate by hot pressing with suitable forming dies, and then machining the circumferential welding grooves.
A) true
B) false
A) true
- Nozzles and stubs for connecting the drum to tubes and piping are formed by _____ forging from a solid steel cylinder, or billet.
A) cold
B) hot
C) mild
D) roll
B) hot