Introduction to Piping and Piping Fittings

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

a) cast iron

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

a) underground steam lines

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

1. material designation 3. manufacturer's trademark or name 5. service designation

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 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

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

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 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

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 newer method used to designate pipe wall thickness is __________________ number. a) schedule b) regulation c) diameter d) circumference e) pipe registration

a) schedule

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

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

Piping insulation should have the following characteristics: 1. be non-corrosive 2. a low heat conductivity 3. high eddy current values 4. be easy to remove from the pipe 5. retain its shape and insulating value when wet 6. 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 1. be non-corrosive 2. a low heat conductivity 5. retain its shape and insulating value when wet 6. be vermin proof

Low pressure steam pipes are usually connected together by: 1. welding 2. glands 3. screwed fittings 4. 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

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

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 e) has a very low pressure range of operation

b) may have a thermostatic air release

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

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

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

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

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

The purpose of steam traps is to remove condensate and _____________________ from steam lines. a) oil b) water c) chemicals d) non-condensables e) sludge

b) water

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

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

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

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

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

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

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

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

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

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

c) outside diameter

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

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

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 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

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

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

A slip type pipe expansion joint: 1. is stronger than the bellows types 2. is actually a pipe within a pipe 3. can have packing added when in service 4. has a lubrication fitting 5. 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

Double extra strong pipe is denoted by a) SS b) 2S c) ES d) XXS e) DES

d) XXS

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

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

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

The most frequently used material for piping is a) non-ferrous b) cast iron c) pig iron d) steel e) plastic

d) steel

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

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

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

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

Cast iron has a high resistance to a) water pressure b) condensate pressure c) tensile stress d) temperature changes e) corrosion

e) corrosion

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

e) prevent welding gases from entering the pipe line

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 is manufactured in two main categories, welded and a) threaded b) soldered c) brazed d) flanged e) seamless

e) seamless

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

In most sizes of pipe, schedule forty corresponds to __________________ wall thickness. a) excessive b) regular c) reduced d) higher e) standard

e) standard

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