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 “U” 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
- The _____ form the connection for the attachment of the Boiler steam generating tubes to the drum and the saturated steam outlet tubes from the top or steam space of the drum.
A) tubes
B) welding
C) stubs
D) manholes
C) stubs
- Upon completion of the welding, every drum must be subjected to a prowled heat treatment
A) true
B) false
B) false
- It is not allowed to make any welds directly to the drum _____ stress relieving has been completed.
A) after
B) before
C) during
D) until
A) after
- A final test which is carried out in the manufacturer’s shop is a hydraulic or hydrostatic test, (conducted according to the ASME Code Section I, PW-54), at a pressure of _____ times the design pressure.
A) 1
B) 2
C) 1.5
D) 5
C) 1.5
- Only some of the firetubes in firetube boilers are _____.
A) expanded B) beaded C) flared D) rolled E) seal welded
E) seal welded
- A tube expander consists of three rollers mounted in a cage, which fits inside the tube end. A tapered mandrel or spindle fits between the rollers and when the mandrel is turned, the rollers are rotated and forced out against the tube wall pressing it against the tube hole.
A) true
B) false
A) true
- Boiler tubes are sometimes welded to _____, which have already been welded to the headers or drum.
A) tubes
B) welds
C) stubs
D) manholes
C) stubs
- Nozzles and stubs for connecting the drum to tubes and piping are formed by hot forging from a solid steel cylinder, or _____.
A) billet
B) stub
C) pipe
D) connector
A) billet
- Postweld heat treatment, often called stress relieving, consists of heating the welded parts uniformly, to a temperature sufficient to relieve most of the stresses created by the heat from the welding, the parts are then cooled at a constant rate.
A) true
B) false
A) true
- In the field, the stress relieving of welded pipe joints may be accomplished by means of _____ induction coils, which are wrapped around the welded section of pipe.
A) magnetic
B) electrical
C) gas
D) heat
B) electrical
- Handholes and manholes are provided in drums and _____ to give access to allow for cleaning, inspection, and repair during the life of the Boiler.
A) furnaces
B) tubes
C) headers
D) superheaters
C) headers
- The ASME code section _____ specifies that the size of an elliptical manhole shall not be less than 280 mm by 380 mm, or 250 mm by 410 mm.
A) IV
B) VII
C) III
D) I
D) I
- When a manhole opening is made in a drum or shell, the area becomes _____ due to the amount of metal removed.
A) stronger
B) weaker
C) flatter
D) rougher
B) weaker
- The covers fit on the _____ of the drum and are held in place by means of bolts and yoke pieces.
A) ends
B) outside
C) inside
D) middle
C) inside
- Drum manhole openings may be elliptical or _____.
A) slotted
B) circular
C) square
D) dished
B) circular
- The gaskets used are the woven type for pressures up to _____ kPa and the metallic type for higher pressures.
A) 1500
B) 2500
C) 5000
D) 3450
D) 3450
- For pressures up to _____ kPa and temperatures up to 454 C, handhole covers with gaskets are used and are bolted in place.
A) 10000
B) 8370
C) 5000
D) 6210
B) 8370
- _____ boilers must be built or put together in the field. (Field erected).
A) recovery
B) sectional
C) larger
D) package
C) larger
- Large quantities of _____ are used to complete the foundations, which must support the loads from the Boiler and all of the auxiliary equipment.
A) steel
B) refractory
C) earth
D) cement
D) cement
- The _____ steel carries the weight of the steam drum and the major pressure components.
A) structural
B) main
C) mild
D) welded
A) structural
- The steam drum is usually the _____ major pressure component placed in the steel structure.
A) last
B) first
C) second last
D) only
B) first
- Coal pulverizers must be installed _____ to allow installation of coal piping to the boiler.
A) last
B) first
C) only
D) early
D) early
