Book 7 Flashcards by jott Singh

In most sizes of pipe, Schedule 40 corresponds to _____ wall thickness.
Select one:

a.
Welded only

b.
Threaded only

c.
Extra strong (XS)

d.
Standard

Standard

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Up to and including DN 300 mm pipe, the “nominal pipe size” refers to a pipe’s
Select one:

a.
nominal circumference

b.
nominal inside diameter

c.
nominal outside diameter

d.
nominal wall thickness

nominal inside diameter

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The purpose of a steam separator is to remove _____ from the steam.
Select one:

a.
Oil

b.
Moisture

c.
Impurities

d.
Non-condensable gases

Moisture

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The piping service symbols “A”, “G”, “O” stand for:
Select one:

a.
Acetylene, gasoline, and oil

b.
Air, gaseous and oil

c.
Air, gases and oxygen

d.
Ammonia, gaseous and octane

Air, gaseous and oil

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In piping systems, the three main types of flange gaskets are the full face, the ring joint, and the:
Select one:

a.
Corrugated Bellows type

b.
Van Stone type

c.
Flat ring type

d.
Segmental ring type

Flat ring type

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In order to ensure safe and continuous operation of a pressure reducing valve, the valve station should have _________________.
Select one:

a.
A safety valve on the high-pressure side

b.
A bypass line, plus a safety valve and pressure gauge on the low-pressure side

c.
Thermometers on the inlet and outlet piping

d.
A strainer immediately downstream of the valve

A bypass line, plus a safety valve and pressure gauge on the low-pressure side

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The biggest advantage of an outside screw and yoke, rising stem valve over other designs is that it is_________.
Select one:

a.
Inexpensive

b.
Stronger in construction

c.
More durable

d.
Easy to see whether the valve is open or closed

Easy to see whether the valve is open or closed

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A frequent cause of serious accidents with valves is __________________.
Select one:

a.
improperly sized valves leading to flow problems

b.
lack of maintenance

c.
inadequate operational training leading to abuse

d.
unsuitable materials for the operating pressures and temperatures

unsuitable materials for the operating pressures and temperatures

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A common material used for water and instrument air piping in power plants is
Select one:

a.
galvanized steel

b.
cast iron

c.
bronze

d.
copper

copper

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What does ASME B31.1 recommend for boiler discharge stop valves?

a.
It recommends they be used with a wheel and motor attached to the stem

b.
It recommends they have an outside screw and yoke with a rising spindle

c.
It recommends having a power actuator to position the disc

d.
It recommends they have an outside screw and yoke with a non-rising spindle

It recommends they have an outside screw and yoke with a rising spindle

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What kinds of damage occur on the valve seat?

a.
Grooving and wire drawing

b.
Stretching and shrinking

c.
Grinding and chipping

d.
Scaling and pitting

Grooving and wire drawing

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The most common material for power plant piping is:
Select one:

a.
Alloyed nonferrous

b.
Forged cast

c.
Steel

d.
Plastic and ABS
Feedback

Steel

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Which of these valve components is NOT considered to be part of “valve trim”?
Select one:

a.
Disc

b.
Seat ring

c.
Body

d.
Valve stem

e.
Packing gland

Body

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The main purpose of insulation on piping systems is to:
Select one:

a.
Reduce heat transfer between the pipe and its surroundings

b.
Allow for the application of line identifier stickers and flow arrows

c.
Provide a paint surface

d.
Prevent condensate from evaporating in the lines

Reduce heat transfer between the pipe and its surroundings

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Which of the following is NOT one of the three general methods used to join or connect lengths of pressure piping?

a.
Threaded pipe and screwed connections

b.
Flanges

c.
Brazed joints

d.
Welded joints

Brazed joints

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Welding together pipes that are 2 inch nominal size or smaller is usually done using:
Select one:

a.
The oxy-acetylene method

b.
The socket weld method

c.
The butt weld method

d.
Automatic welding machines

The socket weld method

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The valve design with the greatest capability to handle slurries and fluids with high suspended solids is the __________ valve.
Select one:

a.
Globe

b.
Gate

c.
Ball

d.
Needle

Ball

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Cast iron pipe has a high resistance to:
Select one:

a.
Water pressure

b.
Impacts

c.
Temperature changes

d.
Corrosion

Corrosion

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Improper drainage of steam lines could cause:
Select one:

a.
Excessive steam pressures

b.
Low pressure in the lines

c.
Water hammer

d.
Excessive weight to the pipe

Water hammer

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Valves that are not clearly identified should be _______________.
Select one:

a.
Used only with water systems

b.
Stamped with a CRN

c.
Rejected

d.
Approved for use by the boiler inspector

Rejected

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Gaskets are installed between pipe flanges to:
Select one:

a.
Prevent leakage due imperfections in the flange face

b.
Allow pipe expansion between flange joints

c.
Account for misalignment of the pipe

d.
Provide cushioning against water hammer

Prevent leakage due imperfections in the flange face

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The service designation of a pipe fitting indicates _____________________.
Select one:

a.
the location where the valve was manufactured

b.
the Canadian Registration Number for the valve

c.
the temperature-pressure rating of the valve

d.
the seat and packing material designation

the temperature-pressure rating of the valve

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Of these materials, the one most commonly used for sewage piping is
Select one:

a.
stainless steel

b.
cast steel

c.
cast iron

d.
aluminum

cast iron

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What does valve trim consist of?

a.
Disc, wheel, guide bushings

b.
Disc, wheel, gland packing

c.
Disc, seat ring, stuffing box

d.
Disc, seat ring, guide bushings

Disc, seat ring, guide bushings

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The __________ valve requires specific and routine lubrication. Select one: a. Butterfly b. Globe c. Check d. Tapered plug

Tapered plug

The wall thickness of steel pipe is designated by its _____________. Select one: a. Schedule number b. CRN number c. Diameter d. Material strength number

Schedule number

A common material used for valve packing is ____________________. Select one: a. Fiberglass b. Mica c. Nylon d. Teflon

Teflon

Foamed plastics are generally used in which low and lower intermediate service temperature range? a. 150°C to 183°C b. 155°C to 183°C c. 150°C to 185°C d. 155°C to 185°C

150°C to 183°C

The mass of a 2 m length of Schedule 40 pipe, outside diameter 101.6 mm, is: Select one: a. 36.98 kg b. 31.9 kg c. 26.92 kg d. 11.48 kg

26.92 kg

A slip type expansion joint: Select one: a. requires no maintenance b. is suitable only for low pressures and temperatures c. requires lubrication d. will adjust for misalignment of lines

requires lubrication

Pipe insulation, when installed on pipes that carry cold fluids, prevents Select one: a. The requirements for heat tracing b. Water hammer at elbows c. Expansion and contraction d. Sweating and corrosion

Sweating and corrosion

The bypass around a regulating valve should contain a ___________ valve. Select one: a. gate b. needle c. globe d. butterfly

globe

The purpose of a steam trap is to: Select one: a. Collect steam for storage purposes b. Reduce the steam pressure in a line c. Remove condensate from steam lines without allowing steam to escape d. Remove steam from a steam line without allowing water to pass

Remove condensate from steam lines without allowing steam to escape

The valve that is least susceptible to wire drawing and seat erosion is the _________ valve. Select one: a. Globe b. Gate c. Plug d. Wedge gate

Globe

A Van Stone flange is fitted ___________ on a pipe: Select one: a. with tack welds b. using coarse threads c. loosely d. with evenly spaced set screws

loosely

A typical application of forged steel in a power plant is: Select one: a. welded pipe fittings b. superheated steam lines c. drain lines d. ash handling systems

welded pipe fittings

A bellows corrugated expansion joint is suitable for pressures up to approximately _______ kPa: Select one: a. 500 b. 1000 c. 2000 d. Unlimited

2000

The inside diameter of a pipe is expressed as the: Select one: a. Pipe size plus wall roughness b. Nominal pipe size c. Formula 2P-M=k d. Outside diameter minus twice the wall thickness

Nominal pipe size

________ provide easy assembly and dismantling of screwed piping connections. Select one: a. Couplings b. Flanges c. Unions d. Bolts

Unions

The three markings mandatory on valves to be used in pressure piping include manufacturer's name, material designation and _______________. Select one: a. weight designation b. CRN number c. valve type d. service designation

service designation

With respect to NPS 14 pipe and larger, as the wall thickness is increased, the: Select one: a. Inside diameter is reduced b. Outside diameter increases c. Weight of the pipe decreases d. Bore of the pipe increases

Inside diameter is reduced

To extend the life of valve packing, we can___________________. Select one: a. Operate the valve at lower temperatures b. Lubricate the valve stem with oil c. Operate the valve slowly d. Operate the valve on a regular basis

Lubricate the valve stem with oil

When tightening the bolts on a pipe flange: Select one: a. Tighten every second bolt first, then tighten the others b. The gasket should be held in place by gasket glue c. The top bolts must be tightened first d. Use a sequential criss-cross method of tightening

Use a sequential criss-cross method of tightening

Materials used for the manufacture of pipes for power plants MUST be: Select one: a. Manufactured only in Canada b. Seamless regardless of the operating conditions c. Suitable for the system operating conditions d. Welded and stress relieved

Suitable for the system operating conditions

One disadvantage of using threaded connections to join pipes and fittings is that it: Select one: a. Is more costly b. Weakens the pipe c. Difficult to insulate d. Requires the services of a pipe fitter

Weakens the pipe

The purpose of the non-return valve on a boiler is to_____________________. Select one: a. Prevent water from entering the steam header b. Prevent the back flow of steam into the boiler c. Prevent the safety valve from popping d. Regulate the flow of steam from the boiler

Prevent the back flow of steam into the boiler

Pipe nipples are _____ on both ends. Select one: a. Welded b. Threaded c. Closed d. Flanged

Threaded

Low pressure steam pipes are commonly joined together by: Select one: a. Welding b. Screwed fittings c. Reducing bushings d. 16 Bolt flanges

Screwed fittings

Expansion of piping is controlled by: Select one: a. Anchoring the pipe at both ends to prevent movement b. Installing an expansion joint in the line c. Preheating the pipe prior to installation d. Installing spring supports on the pipe

Installing an expansion joint in the line

A steam trap should be installed below the _______ point in piping system it serves. Select one: a. Coldest b. Hottest c. Highest d. Lowest

Lowest

The material designation marking on a valve __________________. Select one: a. indicates which manufacturing branch it originates from b. indicates the material that the valve is made from c. gives the maximum temperature for the valve material d. is associated with the Canadian Registration Number

indicates the material that the valve is made from

White cast iron has a high resistance to corrosion and abrasion, which makes it useful for: Select one: a. Underground steam lines b. Ash handling systems c. Condensate lines d. Natural gas supply lines

Ash handling systems

Increasing the spring tension in a pressure reducing valve will ___________________. Select one: a. Reduce or minimize the cycling or "hunting” of the valve b. Decrease the regulated pressure downstream of the valve c. Allow for maintenance to be completed downstream d. Increase the regulated pressure downstream of the valve

Increase the regulated pressure downstream of the valve

An advantage of expansion bends is that they are __________ than expansion joints. Select one: a. stronger b. easier to service c. heavier d. more compact

stronger

When admitting steam to a steam piping system it is imperative to: Select one: a. Use the glycol tracing to warm the line. b. First ensure that no water exists or can accumulate in the piping. c. Ensure drain valves are closed to prevent steam loss. d. Add nitrogen to steam to prevent corrosion.

First ensure that no water exists or can accumulate in the piping.

A check valve____________________. Select one: a. Allows flow in one direction only. b. Uses a heavy spring for setting. c. Requires an inspector's seal to be installed. d. Has a locking spindle for locking out flow for safety.

Allows flow in one direction only.

With respect to NPS 14 pipe and larger, the Nominal Pipe Size number is referring to the: Select one: a. Outside diameter b. Inside diameter c. Thickness d. Mass per metre of length

Outside diameter

Two main categories of manufactured steel piping are Select one: a. Seamless and welded b. Welded or screwed c. Piping and tubing d. Pressure and water

Seamless and welded

_______ fittings are used to provide proper drainage of water. Select one: a. Removable b. Orifice c. Eccentric d. Tapered

Eccentric

A thermostatic steam trap is controlled by the: Select one: a. Difference in velocity between condensate and steam b. Air pressure built up on top of disk c. Temperature difference between condensate and steam d. Bucket, which flips when filled with condensate

Temperature difference between condensate and steam

With respect to NPS 14 pipe and larger, as the pipe schedule increases, the outside diameter: Select one: a. Dependent on the material selected b. Remains the same c. Decreases d. Will be equal to the schedule number

Remains the same

A _________ should be installed just ahead of a steam trap. Select one: a. Check valve b. Throttling valve c. Pressure reducing valve d. Sediment separator or strainer

Sediment separator or strainer

The three general types of flange connections are the screwed, the Van Stone and the _____ . Select one: a. Bolted b. Ring joint c. Raised face d. Welded

Welded

Which gasket has an oval cross-section? Select one: a. Flat ring b. Full face c. Cut asbestos d. Ring joint

Ring joint

Which two systems are used to designate nominal pipe size? a. USCS uses NPS, and SI assigns a DN b. Nominal inside diameter and actual outside diameter c. Schedule numbers and nominal size d. SI uses NPS and USCS assigns a DN

USCS uses NPS, and SI assigns a DN

Valve components that require regular inspection are the _____________. Select one: a. disc and seat b. stem and body c. stuffing box and spindle threads d. hand wheel and packing

disc and seat

Steam traps may also remove _______ from steam lines. Select one: a. Oil b. Superheat c. Chemicals d. Air

Air

A good rule of thumb is to install pipe hangers at ___________ intervals along a pipe. Select one: a. 1 m b. 1.5 m c. 3 m d. 5 m

3 m

_____________ are used to connect pipes of the same diameter, creating a straight run of pipe. Select one: a. Nipples b. Couplings c. Bushings d. Elbows

Couplings

The maximum operating temperature for a carbon steel valve is _________ °C: Select one: a. 280 b. 425 c. 650 d. 1000

425

Plastic foam pipe insulation is: Select one: a. Used for high temperature service on elbows b. Used for refrigeration piping only c. Used for lower temperature purposes d. Often installed by the welders

Used for lower temperature purposes

When butt welding pipe, a backing ring is used to: Select one: a. Reinforce the pipe joint b. Align the pipe c. Prevent welding gases from entering the pipe line d. Reduce the amount of welding rod required

Align the pipe

Which valve is installed by sliding it between two flanges in the piping? a. Gate b. Butterfly c. Globe d. Needle

Butterfly

A mechanical steam trap: Select one: a. Can be fitted in any position b. May have a thermostatic air release c. Has alcohol inside the float d. Requires a difference in steam temperatures to operate

May have a thermostatic air release

Two types of expansion joints are the _________ designs. Select one: a. Bolted and threaded b. Flex bend and raised face c. Ring joint and slip d. Bellows and slip

Bellows and slip

Where is the strainer located in the pressure regulator of a steam pressure reducing station? a. Upstream of the regulator b. Downstream of the regulator c. Upstream of the steam separator d. On the sensing line feeding the regulator

Upstream of the regulator

Which type of steam trap is not suited for outdoor use? a. Ball trap b. Bellows c. Inverted bucket d. Thermostatic

Ball trap

What are the two types of expansion joints in general use? a. Slip and corrugated b. Expansion bend and corrugated c. Expansion bend and expansion joint d. Expansion bend and slip

Slip and corrugated

The bypass around a regulating valve should contain a ___________ valve. Select one: a. gate b. needle c. globe d. butterfly

globe

Cast iron pipe has a high resistance to: Select one: a. Water pressure b. Impacts c. Temperature changes d. Corrosion

Corrosion

With respect to NPS 14 pipe and larger, the Nominal Pipe Size number is referring to the: Select one: a. Outside diameter b. Inside diameter c. Thickness d. Mass per metre of length

Outside diameter

Remains the same

Remove condensate from steam lines without allowing steam to escape

indicates the material that the valve is made from

Which gasket has an oval cross-section? Select one: a. Flat ring b. Full face c. Cut asbestos d. Ring joint

Ring joint

The biggest advantage of an outside screw and yoke, rising stem valve over other designs is that it is_________. Select one: a. Inexpensive b. Stronger in construction c. More durable d. Easy to see whether the valve is open or closed

Easy to see whether the valve is open or closed

The purpose of a steam separator is to remove _____ from the steam. Select one: a. Oil b. Moisture c. Impurities d. Non-condensable gases

Moisture

A bellows corrugated expansion joint is suitable for pressures up to approximately _______ kPa: Select one: a. 500 b. 1000 c. 2000 d. Unlimited

2000

The valve that is least susceptible to wire drawing and seat erosion is the _________ valve. Select one: a. Globe b. Gate c. Plug d. Wedge gate

Globe

service designation

A common material used for valve packing is ____________________. Select one: a. Fiberglass b. Mica c. Nylon d. Teflon

Teflon

Temperature difference between condensate and steam

Which type of steam trap is not suited for outdoor use? a. Thermostatic b. Ball trap c. Inverted bucket d. Bellows

Ball trap

Prevent the back flow of steam into the boiler

The valve design with the greatest capability to handle slurries and fluids with high suspended solids is the __________ valve. Select one: a. Globe b. Gate c. Ball d. Needle

Ball

A slip type expansion joint: Select one: a. requires no maintenance b. is suitable only for low pressures and temperatures c. requires lubrication d. will adjust for misalignment of lines

requires lubrication

________ provide easy assembly and dismantling of screwed piping connections. Select one: a. Couplings b. Flanges c. Unions d. Bolts

Unions

Improper drainage of steam lines could cause: Select one: a. Excessive steam pressures b. Low pressure in the lines c. Water hammer d. Excessive weight to the pipe

Water hammer

A steam trap should be installed below the _______ point in piping system it serves. Select one: a. Coldest b. Hottest c. Highest d. Lowest

Lowest

Increase the regulated pressure downstream of the valve

Book 7 Flashcards

(100 cards)