Introduction to Piping and Piping Fittings Flashcards
The mass of a two metre length of schedule 40 pipe, nominal size 101.6 mm, is a) 12.04 kg b) 8 kg c) 31.9 kg d) 26.92 kg e) 11.48 kg
c) 31.9 kg
For power plants, materials used for the manufacturing of
pipes must be
a) cast iron
b) seamless stainless steel
c) suited to the operating conditions of the piping system
d) case hardened
e) alloyed with sulphur
c) suited to the operating conditions of the piping system
In order to convey fluid from one storage tank to another
a) valves are required
b) pumps are necessary
c) drains are required
d) piping is required
e) control valves are necessary
d) piping is required
Two main categories of steel piping manufactured are the
a) seamless or welded type
b) plastic or steel type
c) ferrous or copper type
d) thick or thin type
e) single or double walled
a) seamless or welded type
Since cast iron has a high resistance to corrosion and abrasion, it is used for a) underground steam lines b) ash handling systems c) condensate lines d) blow-off piping e) high pressure service
b) ash handling systems
Non-ferrous materials used in power plant piping are
a) made of asbestos
b) not allowed by the ASME code
c) usually made of brass and copper alloys
d) made of ceramic materials
e) are made of steel
c) usually made of brass and copper alloys
Forged steel is used primarily for
a) pipe fittings
b) sewer lines
c) steam lines conveying super heated steam
d) ash handling systems
e) water treatment piping and valves
a) pipe fittings
The most frequently used material for piping is
a) non-ferrous
b) cast iron
c) pig iron
d) steel
e) plastic
d) steel
Cast iron has a high resistance to
a) water pressure
b) condensate pressure
c) tensile stress
d) temperature changes
e) corrosion
e) corrosion
Piping made of copper and brass are called
a) ferrous materials
b) non-ferrous materials
c) soft pipe
d) bronze materials
e) residential piping
b) non-ferrous materials
Pipe is manufactured in two main categories, welded and
a) threaded
b) soldered
c) brazed
d) flanged
e) seamless
e) seamless
Up to and including 304.8 mm pipe, the size of the pipe is expressed as a measure of a) circumference b) inside diameter c) outside diameter d) thickness of the wall e) outside radius
b) inside diameter
Commercial pipe is made in standard sizes each having several different: 1. weights 2. colours 3. thickness' 4. shapes 5. threads a) 1, 5 b) 2, 3, 4 c) 1, 3 d) 4, 5 e) 2, 3, 5
c) 1, 3
All classes of pipes of a given size have
a) the same outside diameter
b) the same inside diameter
c) the same length
d) the same expansion coefficient
e) the same mass per metre run of the pipe
a) the same outside diameter
Double extra strong pipe is denoted by
a) SS
b) 2S
c) ES
d) XXS
e) DES
d) XXS
A newer method used to designate pipe wall thickness is by
a) measuring the thickness with callipers
b) using a comparitor gage
c) using schedule numbers
d) using a pipe gauge
e) using a pipe graph comparitor chart
c) using schedule numbers
As the wall thickness of a pipe increases the
a) inside diameter is reduced
b) outside diameter increases
c) the weight of the pipe decreases
d) the bore of the pipe increases
e) the pipe becomes less suitable for steam service
a) inside diameter is reduced
The inside diameter of a pipe is expressed as the
a) average pipe size
b) regular pipe size
c) nominal pipe size
d) circumferential pitch
e) central cross section of service
c) nominal pipe size
For varying wall thickness' of pipe, tables are developed which give the dimensions and a) volume in cu m b) length in cm c) diameter in cm square d) weight in kg/m e) thickness in cm
d) weight in kg/m
Up to and including 304.8 mm pipe, the size is expressed as \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ inside diameter. a) natural b) normal c) nominal d) greater e) reduced
c) nominal
In most sizes of pipe, schedule forty corresponds to \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ wall thickness. a) excessive b) regular c) reduced d) higher e) standard
e) standard
A newer method used to designate pipe wall thickness is \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ number. a) schedule b) regulation c) diameter d) circumference e) pipe registration
a) schedule
Copper and copper alloy piping and tubing is not used in
power plants when
a) pressure is a prime factor
b) temperature is a prime factor
c) instrumentation systems require tubing
d) steam becomes corrosive
e) chemicals are used in the applicable system
b) temperature is a prime factor
As a piping and pipe fitting material, cast steel is used
a) extensively for fittings
b) mainly for instrumentation and control piping
c) for construction of welded pipe
d) steam traps
e) primarily for special applications
e) primarily for special applications
Pipe fittings which are not clearly identified should be
a) used only with water systems
b) tested and used
c) rejected
d) painted as required by the colour code
e) reported to the boilers branch
c) rejected
All markings on pipes and pipe fittings must indicate the following three minimum requirements: 1. material designation 2. inside diameter 3. manufacturer's trademark or name 4. flange type 5. service designation 6. national code colour a) 1, 2, 6 b) 2, 4, 5 c) 3, 4, 6 d) 1, 3, 5 e) 4, 5, 6
d) 1, 3, 5
The piping service symbols “A”, “G”, “O” stand for:
a) ammonia, grease, and oxygen
b) aluminum, glass, and octane
c) air, gas, and oil
d) air, glycol, and oil
e) ammonia, gas, and octane
c) air, gas, and oil
A valve stamped with the following service symbol letters "G", "A", "S" stands for: a) gas, air, and steam b) gaseous substances c) grease, acetylene, and sulphur d) glue, acid, and salt brine e) glycol, air, and saline
a) gas, air, and steam
A grey cast iron fitting is identified by
a) the letters G.C.I.
b) not being marked on the fittings
c) the letters G.C.
d) the letters C.I.
e) the letters G.C.I.F.
b) not being marked on the fittings
Fittings used to connect a straight run of same size piping are a) nipples b) couplings c) bushings d) elbows e) return bends
b) couplings
Relative to pipe and fittings, an anchor chair is used to
a) install piping at considerable height
b) allow for expansion and contraction of pipe
c) anchor a slip type expansion joint
d) support pipe
e) hold a large fitting in a piping run
d) support pipe
Combine the following gaskets with their use:
- cork
- asbestos rope
- rubber
- metal asbestos
- high pressure steam
- lubricating oil
- cold water
- flue gas ducts
a) 1-7, 4-8, 3-6, 2-5
b) 1-5, 2-6, 3-7, 4-8
c) 1-6, 3-7, 4-5, 2-8
d) 1-8, 2-7, 3-6, 4-5
e) 1-8, 3-6, 2-7, 4-5
c) 1-6, 3-7, 4-5, 2-8
Low pressure steam pipes are usually connected together by:
- welding
- glands
- screwed fittings
- flanges
a) 1, 2, 3
b) 1, 3, 4
c) 2, 3, 4
d) 1, 2, 3, 4
e) 3, 4
b) 1, 3, 4
The best material for gaskets in very high temperature areas would be a) metallic b) cork c) nylon d) plastic foam e) rubber
a) metallic
A disadvantage of using threads to join pipes and fittings is,
that it
a) is more costly
b) cannot be repaired
c) weakens the pipe
d) does not allow for expansion
e) requires the services of a pipe fitter
c) weakens the pipe
The vanstone type flange fits on the pipe
a) in a fixed position
b) by being welded onto the inside circumference of the flange
c) by being threaded on the ends
d) loosely
e) by evenly spaced set screws
d) loosely
When tightening pipe flange bolts
a) tighten them in sequence
b) the gasket should be held in place by gasket glue
c) the top bolts must be tightened first
d) use a cross-over method or criss-cross method of tightening
e) tighten every second bolt first then tighten the others
d) use a cross-over method or criss-cross method of tightening
Welding together pipe size of two inch nominal size and smaller is usually done by a) the oxygen-acetylene method b) the socket welded method c) the butt welded method d) non-pressure welders e) pipe fitters
b) the socket welded method
By using backing rings in butt welded pipes, the backing ring
serves to
a) reinforce the pipe because of bevelling at the joint
b) reduce sludge flow
c) align the pipe
d) support the pipe to the wall
e) prevent welding gases from entering the pipe line
c) align the pipe
Ring joint gaskets are
a) round in cross-section
b) flat
c) square in cross-section
d) oval in cross-section
e) hollow
d) oval in cross-section
Gaskets are used in pipe flange joints to
a) prevent leakage because of small imperfections in the
flange face
b) allow for pipe expansion between each flanged joint
c) make up for the misalignment of the pipe
d) provide cushioning in the event of water hammer
e) prevent air ingress in high pressure steam mains
a) prevent leakage because of small imperfections in the
flange face
A bellows type corrugated expansion joint is suitable for pressures up to approximately a) 2,000 kPa b) 500 kPa c) 1,000 kPa d) 30,000 kPa e) 15,000 kPa
a) 2,000 kPa
A device which incorporates a swirling motion to remove moisture from a piping system is the a) steam trap b) baffle type separator c) chevron drier d) centrifuge e) centrifugal separator
e) centrifugal separator
The two types of expansion joints are the \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ and the slip expansion joint. a) bolted b) fixed c) stationary d) bellows e) rotating
d) bellows
Expansion of piping is controlled by:
1. anchoring the pipe at both ends to prevent movement
2. installing a corrugated expansion joint in the line
3. installing an expansion bend in the line
4. anchoring the pipe at both ends and installing hangers
every five metres
a) 1, 2
b) 2, 3
c) 2, 3, 4
d) 1, 2, 3, 4
e) 2, 3, 4
b) 2, 3
Expansion bends have the advantage over the expansion joint for one of the following reasons: a) being stronger b) they are thinner c) they are heavier d) they are cheaper e) they are portable
a) being stronger
Expansion bends or joints are implemented in piping systems
to
a) allow for correct piping drainage
b) give allowance for pressure increases
c) protect against water hammer damage
d) allow for expansion and contraction of the piping
e) reduce pipe costs
d) allow for expansion and contraction of the piping
Pipe hangers are installed at three metre intervals to: 1. align the pipe 2. keep the pipe out of the way of foot traffic 3. provide a proper drainage slope 4. support the weight of the pipe, valves, and fluid contained within the pipe 5. allow for pipe expansion a) 1, 2, 4 b) 1, 3, 4, 5 c) 1, 2, 5 d) 1, 2, 3, 4, 5 e) 2, 3, 5
b) 1, 3, 4, 5
The bellows type expansion joint is good for pressures up to approximately a) 7,000 kPa b) 700 kPa c) 15,000 kPa d) 2,000 kPa e) 5,000 kPa
d) 2,000 kPa
A slip type pipe expansion joint:
- is stronger than the bellows types
- is actually a pipe within a pipe
- can have packing added when in service
- has a lubrication fitting
- is usually flame fitted to the pipe
a) 1, 3, 4, 5
b) 1, 2, 5
c) 1, 2, 4
d) 1, 2, 3, 4, 5
e) 2, 3, 5
d) 1, 2, 3, 4, 5
Before admitting any steam to a steam piping system it is
imperative to first
a) warm the line up properly
b) positively ensure that no water or condensate exists in
the piping
c) ensure drain valves are closed
d) crack open the steam valve
e) ensure the steam pressure is at maximum value allowed
without the boiler safety valve opening
b) positively ensure that no water or condensate exists in
the piping
Cold water piping systems are usually insulated so that
a) the loss of heat is prevented
b) the ingress of heat is prevented
c) corrosion is minimized or eliminated
d) appearance is improved
e) water hammer is eliminated
c) corrosion is minimized or eliminated
An insulation suitable for temperatures up to 430 degrees C is a) plastic foam b) asbestos c) magnesia d) glass fibre e) cellular glass
e) cellular glass
Ease of application and installation is a desirable property of a) pipe fittings b) asbestos insulation c) pipe insulation d) piping e) tubing
c) pipe insulation
Improper drainage of steam lines could
a) result in excessive steam pressures
b) cause low pressure in the lines
c) eventually result in water hammer
d) give excessive weight to the pipe
e) render the feed water pump ineffective
c) eventually result in water hammer
Piping insulation should have the following characteristics:
- be non-corrosive
- a low heat conductivity
- high eddy current values
- be easy to remove from the pipe
- retain its shape and insulating value when wet
- be vermin proof
a) 1, 2, 4, 6
b) 1, 2, 5, 6
c) 1, 3, 4, 5
d) 1, 2, 3, 5
e) 1, 3, 5
b) 1, 2, 5, 6
The main purpose of installing insulation on pipe systems is
to
a) prevent heat transfer
b) give the pipe a neat appearance
c) prevent injury to personnel due to contact with the
bare surfaces of the pipe
d) provide a paintable surface
e) prevent condensate from evaporating in the lines
a) prevent heat transfer
Plastic foams used for pipe insulation are
a) used for high temperature service
b) for refrigeration system piping only
c) for lower temperature insulation purposes
d) prohibited from power plant use
e) glued directly to the pipe
c) for lower temperature insulation purposes
Insulating pipes which carry substances lower than the ambient air temperature, will prevent \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ on the pipe and consequent dripping and corrosion. a) discoloration b) evaporation c) water hammering d) expansion e) sweating
e) sweating
The purpose of a steam separator is to remove \_\_\_\_\_\_\_\_\_\_\_\_\_\_ from the steam. a) oil b) air c) moisture d) gas e) non-condensables
c) moisture
The purpose of steam traps is to remove condensate and \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ from steam lines. a) oil b) water c) chemicals d) non-condensables e) sludge
d) non-condensables
A \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ should be installed just ahead of a steam trap. a) check valve b) non return valve c) pressure gauge d) pressure reducing valve e) sediment separator
e) sediment separator
A mechanical steam trap
a) can be fitted in any position
b) may have a thermostatic air release
c) should be fitted to the safety valve drain
d) has alcohol inside the float
b) may have a thermostatic air release
A thermostatic trap is controlled by a
a) difference in velocity between condensate and steam
b) combination of bucket and float
c) temperature differential between condensate and steam
d) bucket which tips when filled with condensate
e) high level float control
c) temperature differential between condensate and steam
A purpose of a steam trap is to
a) prevent steam from flowing in the steam line
b) prevent air from flowing in the steam line
c) automatically drain condensate from steam lines
d) cause the water in steam lines to accumulate
e) hold back foreign particles from the steam line
c) automatically drain condensate from steam lines
Steam traps are usually located
a) at the highest point of a steam line
b) at the highest point of a hot water line
c) at the lowest point of a hot water line
d) at the lowest point of a steam line
e) at the hottest point of a steam line
d) at the lowest point of a steam line
The operation of a mechanical steam trap depends on the
a) difference in temperature between the steam and condensate
b) difference in specific gravity between the steam and condensate
c) difference in pressure between the steam and condensate
d) liquid level in the condensate tank
e) liquid level in the steam trap
e) liquid level in the steam trap
Two fittings that can be found on a steam separator are:
- gauge glass
- pressure gauge
- vent valve
- steam trap
- safety valve
a) 1, 2
b) 1, 4
c) 2, 3
d) 4, 5
e) 2, 5
b) 1, 4
