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api 570 re-do > API 574 Q&A > Flashcards

API 574 Q&A Flashcards

1
Q

API Recommended Practice 574, Inspection of Piping, Tubing Valves, and Fittings, does not cover:

A

control valves.

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2
Q

The refining industry generally uses what type piping for severe service?

A

seamless

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3
Q

Piping made by rolling plates to size and welding the seams is larger than ______ inches outside diameter

A

16

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4
Q

Steel and alloy piping are manufactured to standard dimensions in nominal pipe sizes up to ______ inches.

A

48

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5
Q

Steel and alloy piping are also manufactured to standard thicknesses designated as schedules in nominal
pipe sizes up to _______ inches.

A

36

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6
Q

The actual thickness of wrought piping may vary from its nominal thickness by a manufacturing under
tolerance of as much as _________ percent.

A

12.5

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7
Q

Cast piping has thickness tolerance of + ______ inch and - _______ inch.

A

1/16, 0

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8
Q

For all nominal pipe sizes of ______ inches and smaller, the size refers to the nominal inside diameter.

A

12

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9
Q

Under tolerance of welded pipe often used in refinery service is ________ inch

A

.010

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10
Q

For what service is cast iron piping normally used.

A

Nonhazardous service, such as water.

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11
Q

Tubing is generally seamlessly drawn, but it may be welded. Its stated size is its actual:

A

outside diameter.

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12
Q

What type valve is normally used in a fully open or fully closed position?

A

gate

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13
Q

What type gate valves have body and port openings that are smaller than the valves’ end opening.

A

Reduced-port gate valves

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14
Q

What type of gate valve should not be used as block valves associated with pressure relief devices?

A

Reduced-port gate valves

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15
Q

What is a globe valve used for?

A

It is commonly used to regulate fluid flow.

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16
Q

A plug valve consists:

A

of a tapered or cylindrical truncated cone with a slot that is fitted into a correspondingly shaped seat.

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17
Q

What type of valve depends upon a spherical type gate has a hole in it and is rotated to open or close it?

A

ball valve

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18
Q

What are check valves normally used for?

A

They are used to automatically prevent backflow.

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19
Q

What are slide valves generally used for?

A

They are generally used in erosive or high-temperature service.

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20
Q

What type of joint listed below would you NOT use in a 300 psi pipe system?

A

bell-and-spigot

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21
Q

What type of pipe joint is generally limited to piping in non-critical service and has a nominal size of 2 inches
or smaller.

A

threaded joint

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22
Q

Socket-welded joints are usually used in nominal pipe sizes of _____ or smaller.

A

2”

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23
Q

Which of the joints listed is the most common found in the petroleum industry?

A

butt-welded joints

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24
Q

The primary purpose of piping inspection is to:

A

ensure plant safety and reliability; also achieve desired quality assurance.

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25
Q

Adequate inspection is a prerequisite for maintaining piping

A

in a safe, operable condition.

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26
Q

OSHA 1910.119 mandates that:

A

piping be inspected to a code or standard such as API 570.

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27
Q

Regulatory requirements usually cover only those conditions that affect:

A

safety.

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28
Q

The single most frequent reason for replacing piping is:

A

thinning due to corrosion.

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29
Q

Leaks in piping systems are most easily detected:

A

while the equipment is operating and should be looked for continuously.

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30
Q

A greater loss in metal thickness will usually be observed near a restriction or change in direction in a pipe
line. What usually causes this?

A

The effects of turbulence or velocity.

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31
Q

What type of problem would you expect to find in catalyst, flue-gas, and slurry piping on a Fluid Catalytic
Cracking Unit.

A

erosion

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32
Q

Stainless steel such as type 304 18 Chr.-8 Ni in the presence of temperature above 100 degrees F. may
crack because of the presence of:

A

chlorides

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33
Q

A 2” diameter line is injecting a product into an eight inch diameter pipe. What type of deterioration would
you expect to take place?

A

accelerated corrosion or erosion.

34
Q

An inspector is checking a piping system that has had problems with isolated corrosion at or near the welds
of piping shoes. Without knowing what product is in the line, what would be the best answer below for the
problem?

A

The shoes are acting as cooling fins and causing localized temperature differences.

35
Q

What type of problem would you expect in piping containing Amine?

A

stress corrosion cracking.

36
Q

What area do you consider to be of most concern when inspecting a piping system?

A

At and/or downstream of a chemical injection point.

37
Q

Leaks in utility piping (water, steam, etc.) are:

A

seldom hazardous but they do result in losses.

38
Q

Where do many (maybe the majority) of leaks occur in pipelines?

A

flanges or packing glands.

39
Q

The prompt repair of _________ will often prevent serious corrosion or erosion of gasket surfaces or
packing glands.

A

leaks

40
Q

The deformation of a vessel wall in the vicinity of a pipe attachment; expansion joints that are not performing
properly; a pipe dislodged from its support; etc. are evidence of:

A

misalignment

41
Q

Spring hanger loadings should be checked under:

A

both cold and hot conditions

42
Q

An inspector finds concrete fireproofing around a structural steel column with openings (cracks). The
inspector suspects that water may be entering. What should the inspector do?

A

Enough fireproofing should be removed to determine the extent of the problem.

43
Q

If a steel column in a pipe support rack is corroded. What should the inspector do?

A

Thickness measurements should be taken to determine whether enough metal is left to safely support
the load.

44
Q

If you find a slotted hole in a baseplate, what would this indicate to you?

A

It indicates that the baseplate may have been designed to accommodate expansion.

45
Q

As an inspector, you find a 6” diameter pipe line that is vibrating and swaying. What is one of the most
important things you would you check for and where would you check?

A

Welds should be inspected for cracks, particularly at points of restraint

46
Q

A insulated pipe shows evidence of defects in the jacketing covering the insulation. You suspect that water
may be getting in through the defects. What would you do?

A

Strip enough insulation to determine the extent and severity of possible corrosion.

47
Q

While inspecting an underground pipe line right-of-way, you find a discolored spot on the ground near a road
that crosses the right-of-way. Which of the items below would be the course you would follow?

A

The discoloration should be investigated as a possible spill. Soil or liquid samples should be checked to see
if it is corrosive to the underground

48
Q

An increase in pump pressure at the pump accompanied by a decrease in flow in a pipe line downstream is
an indication of __________.

A

fouling

49
Q

Ultrasonic instruments are widely used for thickness measurements and are used extensively by inspection
organizations. If a transducer is not equipped with “high temperature” delay-line material, it can be damaged
by temperatures over ______ degrees F.

A

1000

50
Q

Reduction of strength of the metal in a pipe, scaling, bulging, metal deterioration or complete failure are all
symptoms of:

A

excessive temperature.

51
Q

Points of probable external corrosion of underground piping can be located by a series of
measurements of the:

A

electrical resistance of surrounding soil or by measurement of pipe-to-soil electrical potential.

52
Q

One of the most important things that an inspector must do before he actually goes out to make an
inspection is:

A

review the records of previous inspections and of inspections conducted during the current operating
period.

53
Q

When making a visual internal inspection of a pipe and fouling is found, what should the inspector
do?

A

Cleaning should be considered, also, the deposits should be checked to find their origin.

54
Q

The locations on piping most susceptible to cracking are:

A

welds.

55
Q

When checking austenitic materials for cracks using PT methods only liquid penetrants:

A

with low or no chlorides should be used

56
Q

What type of defect would you expect to find at the bottom of a groove of a ring joint flange made from
ASTM A-347 Stainless Steel?

A

cracks

57
Q

Valves should be dismantled at specified intervals to permit examination of all internal parts. Body thickness
should be measured at locations that were inaccessible before dismantling, particularly at:

A

locations that show evidence of corrosion or erosion.

58
Q

Gate valves should be measured for thickness between the seats, since serious deterioration may
have occurred because of:

A

turbulence.

59
Q

Why is the area between the seats of a gate valve a weak location?

A

The wedging action of the disk when is seats causes strain in this area.

60
Q

After a valve has been inspected, repaired as necessary, and reassembled, what should be done next?

A

It should be tested to API 598 requirements

61
Q

In addition to checking the gasket surfaces of flanges for defects, and checking for corrosion and erosion,
which of the following additional checks:

A

The bolts should be checked for proper specification, stretching, and corrosion. The gasket must be of the
proper type and material.

62
Q

A weld is being made in carbon steel piping carrying Amine (MEA). What should the inspector check in
addition to insuring that the weld is proper and meets specifications.

A

Amine can cause environmental cracking; the weld should be checked for hardness.

63
Q

Welded joints in carbon steel and carbon-molybdenum steel exposed to elevated temperatures of 800
degrees F or over may be subject to:

A

graphitization

64
Q

Why should a leaking threaded joint NOT be tightened while the system is in service under pressure?

A

An undetected crack in a thread root might fail and cause a release of product.

65
Q

What type of pipe joint must not be used without adequate axial restraint on the piping?

A

clamped joints.

66
Q

Where excessive vibration or swaying was noted in a piping system during operation, an inspection should
be made for points of _________ and _________ ________ and for cracks in welds at locations that could
not be inspected during operation.

A

abrasion, external wear

67
Q

Piping that has been in service or had hot spots of 800 degrees F and above should be checked for creep or
deformation with time under stress by:

A

measuring the outside diameter of the pipe and comparing established data for life.

68
Q

Special attention should be given to small connections such as vents, bleeders, any type of small nipple.
One method for successfully checking the condition and the thickness of nipples is the use of:

A

RT

69
Q

A pressure test of piping, in most cases is a:

A

leak test.

70
Q

Any system being tested needs to be completely isolated to:

A

prevent the testing medium from entering connecting lines.

71
Q

If a pressure test is conducted with air or if excess air is trapped in a system that is being hydrostatically
tested, a failure of the system will be:

A

more violent than in a totally liquid filled system because of the expansion of the compressible medium.

72
Q

In which of the following systems would water be a questionable test medium?

A

acid lines, cryogenic systems, and air-drier systems.

73
Q

What should be considered when testing carbon steel piping during cold weather or if cold fluids are used in
the testing?

A

The transition temperature of the steel should be considered to prevent brittle failure.

74
Q

What is the preferred medium for a pneumatic test?

A

an inert gas.

75
Q

What type of piping usually has a pressure recorder attached in which a permanent record of the test is
made.

A

underground piping.

76
Q

Which of the following piping should NOT be hammer tested?

A

cast iron and stress-relieved lines in caustic and corrosive service.

77
Q

New construction piping should meet the requirements of _________ as a minimum.

A

ASME B-31.3

78
Q

A Piping Engineer must be:

A

acceptable to the owner/user

79
Q

A “piping system” does not include which of the following items?

A

bents

80
Q

The boundary of a piping circuit should be sized:

A

to provide for accurate record-keeping and field inspection

api 570 re-do (4 decks)

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