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CLOSED BOOK QUESTIONS FOR API 575
Note: try these questions after read API 575 once; some of following questions will be as open book.
These questions are prepared to under stand each and every section of the API 575.

1.

What old code was used to build rivet tanks?

 
 
 
 

2.

What code covers the safety precautions of entering a tank?

 
 
 
 
 

3.

What code covers cathodic protections of tanks?

 
 
 
 

4.

What code covers tank lining?

 
 
 
 

5.

What code covers tank venting?

 
 
 
 
 

6.

What code covers the design of low-pressure tanks?

 
 
 
 

7.

When taking UT thickness readings, it is recommended to use digital meter that also has a___________________

 
 
 
 

8.

Dual-element transducer may give a false reading when the material thickness is less than__________ inch.

 
 
 
 

9.

A Dual element transducers on a digital UT meter can effectively measure thickness between:____________ inch.

 
 
 
 

10.

Which type of UT transducer is best for small diameter deep pits?

 
 
 
 

11.

Which of the statement is correct, when UT thickness checking over paint or coating?

 
 
 
 

12.

For coated tanks that have coatings that vary in thickness, which type of UT transducer is best?

 
 
 
 

13.

When performing a UT scan, the scans should overlap by __________ of the transducer diameter.

 
 
 
 

14.

When performing a UT scan, a large diameter transducer may miss ________ diameter deep pits.

 
 
 
 

15.

UT shear-wave is primarily used in tanks to find defects in _________ joints.

 
 
 
 

16.

The ability to detect the following is the primary advantage of using the magnet-flux floor scanner, but not this one.

 
 
 
 

17.

When using a magnet-flux scanner to inspect a tank floor, indications found are generally “proved-up” using __________.

 
 
 
 

18.

When the product temperature in a tank increases, the vapor pressure of the product _______.

 
 
 
 

19.

While in operation, which tank-type roof is supported by internal members?

 
 
 
 

20.

What is the primary reason(s) for using floating roofs?

 
 
 
 

21.

Which type of external floating roof is the most susceptible to sinking?

 
 
 
 

22.

Which type of external floating roof is the least susceptible to sinking?

 
 
 
 

23.

The most common type of floating roof seal are the __________.

 
 
 
 

24.

When are internal floating roof tanks used? Where liquid _________.

 
 
 
 

25.

Low-pressure storage tanks are those with a design from ___________ Psig.

 
 
 
 

26.

Low-pressure storage tanks are normally used for products that have a high _________ pressure.

 
 
 
 

27.

For pressure above ________ psig, the hemispheroidal, spheroidal, and nodded spheroidal tanks are commonly used.

 
 
 
 

28.

These types of tanks are usually built in areas where large snowfalls or rainfalls might sink an open top-floating roof.

 
 
 
 

29.

Tank pads with cinders that contain __________ compounds become corrosive when wet.

 
 
 
 

30.

These items in a sand pad may cause bottom-side corrosion, but not this one?

 
 
 
 

31.

Causes of severe external corrosion at the bottom of the lower shell course are _______ .

 
 
 
 

32.

Small depressions in the roof are susceptible to ___________ corrosion.

 
 
 
 

33.

Concentration cell corrosion may occur in the many niches of ____________ tanks.

 
 
 
 

34.

What metallurgy is primarily used when constructing crude oil tanks?

 
 
 
 

35.

These are common vapors that corrosion in a tank’s vapor space, but not this one?

 
 
 
 
 

36.

Generally in the liquid portion of a tank, internal corrosion is worse at the ______.

 
 
 
 

37.

What type of tank failure results in a sudden loss of the product?

 
 
 
 

38.

The most likely points for cracks to occur are _________.

 
 
 
 
 

39.

What welds are most susceptible to cracking in a hot tank?

 
 
 
 

40.

What is the most susceptible to cracking in a large diameter tank?

 
 
 
 

41.

What is the most likely problem when there is excessive uniform settlement?

 
 
 
 

42.

What is the common problem with pressure-vacuum vents?

 
 
 
 

43.

A plugged floating roof drain can cause the roof to ________.

 
 
 
 

44.

The inspection checklists in Appendix C are:

 
 
 
 

45.

The tanks made by wooden material are also attacked by _______.

 
 
 
 

46.

After a significant rainfall the __________ on floating roofs should be checked.

 
 
 
 

47.

Before entry or reentry any tank, appropriate safety precautions are necessary, generally such precautions are_______________.

 
 
 
 

48.

Prior to conducting an external or internal inspection, the inspector should review_____________ to become familiar with problems and recommendations noted in previous inspection and maintenance reports.

 
 
 
 

49.

What type of corrosion can happen between a bolt head and a steel plate?

 
 
 
 
 

50.

When inspecting handrails pay particular attention to tubular members, because they corroded__________.

 
 
 
 

51.

When inspecting handrails pay particular attention to tubular members, because they corroded__________.

 
 
 
 

52.

Low spot platforms that collect water are routine places for corrosion to occur. This can be solved by _________.

 
 
 
 

53.

Tank foundations made of ___________

 
 
 
 

54.

For tanks on a concrete pad, the floor to pad joint should be ___________

 
 
 
 

55.

Corrosion below as anchor-bolt nut sometimes can be detected by__________

 
 
 
 

56.

A pipe connected to tanks should be inspected. Where pipe enters the soil, the soil should be dug away__________ inches to inspect for soil-to-air corrosion?

 
 
 
 

57.

If distortion is found at the nozzles, the welds and shell area should be examined for __________

 
 
 
 

58.

Ground connections should be ___________ checked.

 
 
 
 

59.

The resistance of the grounding connections should not exceed _______ ohms.

 
 
 
 

60.

Which potential problem with coatings is most difficult to see?

 
 
 
 

61.

Paint blisters occur most often on the roof and on the shell area that receives most ________

 
 
 
 

62.

The ___________ side of an insulated tank is most susceptible to CUI.

 
 
 
 

63.

CUI may be significant at the bottom of the tank, because the insulation may be in contact with______________.

 
 
 
 

64.

Inspectors should not walk on _____________ tank roofs

 
 
 
 

65.

The depth of a locally corroded area can best be measured with a long __________

 
 
 
 

66.

The depth of isolated pits are normally measured with a ___________

 
 
 
 

67.

What part of the shell of a floating roof tank usually corrodes at twice the rate of the rest of the shell?

 
 
 
 

68.

Stiffeners and wind girders are normally inspected visually and by _________testing.

 
 
 
 
 

69.

Caustic tanks may be subject to a corrosion mechanism called _________

 
 
 
 

70.

Where is caustic cracking most common?

 
 
 
 

71.

Caustic material seeping through cracks will usually form readily visible ___________

 
 
 
 

72.

Prior to welding on a tank in caustic service, the area should be thoroughly cleaned and checked with the _________ solution.

 
 
 
 

73.

Hydrogen blisters can be found using:

 
 
 
 
 

74.

Tank shell distortions can be measured using a ___________

 
 
 
 

75.

Hydrogen blistering mat is found on the shell near:

 
 
 
 

76.

These are causes of tank shell distortion and not this one?

 
 
 
 
 

77.

Tank shell distortions may cause welds to be highly stressed and results in a _________

 
 
 
 

78.

Rivet can be best checked for looseness by using a ____________

 
 
 
 

79.

The thickness of a tank roof can be checked by __________ or _____________.

 
 
 
 

80.

When walking on a cone-roof tank, planks can be used. Planks that are used should be long enough to span at least __________ should be laid and used as walkways.

 
 
 
 

81.

Individuals on a tank roof should walk on the _____________.

 
 
 
 

82.

When walking on a floating roof, the tank should always be in the _________ position.

 
 
 
 

83.

External corrosion on a tank roof will usually be most severe at __________

 
 
 
 

84.

What is the primary reason for periodically inspecting flame arrestors?

 
 
 
 

85.

When tunneling under a tank to inspect the bottom (it is rarely done!) it is difficult to properly_____________ the tunnel.

 
 
 
 

86.

Probably the most expensive way to inspect the bottom-side of the tank floor is to _______ the tank

 
 
 
 

87.

Types of floating roof drain are_________.

 
 
 
 

88.

When the tank is out-of-service, the floating roof drain piping can be checked by pressure testing. Drains with swing joints require testing at ___________

 
 
 
 

89.

During the external inspection, float-type gauges should be checked to make sure they are not cracked or filled with ___________

 
 
 
 

90.

In a tank, you noticed distortion, what will be the immediate action?

 
 
 
 

91.

Before allowing individuals on a floating roof tank that is not in the high-gauge position, a______________ test shall be performed before personnel are allow on the roof.

 
 
 
 

92.

Normally internal tank corrosion is most prevalent in:

 
 
 
 

93.

Dry pyrophoric material can cause:

 
 
 
 

94.

Pyrophoric material may accumulate on the tank bottom or on the top of the__________.

 
 
 
 

95.

In source service, corrosion is often occurs in the ___________.

 
 
 
 

96.

In source service, corrosive vapors are formed when the _________ mixes with moisture and air.

 
 
 
 

97.

Carbon steel that has slag inclusions and _______ is more susceptible to hydrogen blistering.

 
 
 
 

98.

Caustic stress corrosion cracking is prevalent in carbon steel when the temperature is above________°F

 
 
 
 

99.

Tank bottoms are normally inspected visually and with __________

 
 
 
 

100. For Question number 99 to 101 :
During the internal inspection, a tank floor can be 100% inspected or partially inspected when
using a statistical method. Based on the statistical method answer the following.

What percentage of the floor should be scanned?

 
 
 
 

101.

What pattern across the tank is generally used?

 
 
 
 

102.

What part should be completely scanned?

 
 
 
 

103.

Corrosion on the tank bottom may be very ____________.

 
 
 
 

104.

What simple technique can be used to pop deposits out of pits, making the pits much easier to see?

 
 
 
 

105.

What tool can assist in measuring the depth of a localized corroded area?

 
 
 
 

106.

Rivet seams can be checked with a________

 
 
 
 

107.

Depressions in the tank floor and in the area around roof supports should be checked for accelerated_________.

 
 
 
 

108.

One method to check for penetrations in the bottom is to clean the tank floor and check for_________.

 
 
 
 

109.

One method to check for bottom-side corrosion that is usually not effective is the _______

 
 
 
 

110.

Tanks with bottom angle joining the bottom-to-shell should be checked for _________

 
 
 
 

111.

Tank that contain dilute acids often are lined with________.

 
 
 
 

112.

An effective way to locate pinholes and cracks in lead is with___________

 
 
 
 

113.

Bulges in a lead liner indicate _________ behind the liner and are likely places of deterioration of the liner.

 
 
 
 

114.

What is good practice when examining suspect areas in lead-lined tanks?

 
 
 
 

115.

Rubber tanks linings can be checked with a __________

 
 
 
 

116.

Holiday testing is used to test ________

 
 
 
 

117.

When using a holiday detector it is important that the voltage does not get high enough to_________ the lining.

 
 
 
 

118.

Glass-lined tanks should never be _________________.

 
 
 
 

119.

What type of lined tanks should be painted a unique color to indicate they have a special lining?

 
 
 
 

120.

If corrosion is noted on the roof and upper shell, the structural members will also usually__________ thinning of the roof or shell.

 
 
 
 

121.

What is an effective inspection technique for checking whether there is corrosion behind a concrete lining?

 
 
 
 

122.

When significant corrosion is seen on the roof during the internal inspection, it is important to erect scaffolding so that ____________

 
 
 
 

123.

If corrosion is found internally on the shell at a specific elevation in a cone roof tank, it is important to check the ______________ at the same elevation.

 
 
 
 

124.

What metallurgy should never be hammer-tested?

 
 
 
 

125.

What internal tank component should be hydrostatically tested during an internal inspection?

 
 
 
 

126.

Steam heating coils should be inspected for __________ grooving in the bottom of the coil with either UT or RT.

 
 
 
 

127.

Pontoons on swing line should be visually examined and _________________ for cracks.

 
 
 
 

128.

When hydro-testing a tank consideration should be given to the ________ of the shell material.

 
 
 
 

129.

If an atmospheric tank is an air tested, the pressure should not exceed _____ inch of water.

 
 
 
 
 

130.

A pneumatic test of a tank is good for finding ________ but is not a good pressure test.

 
 
 
 

131.

What part(s) of the atmospheric tank has a very low-stress load?

 
 
 
 

132.

The pressure exerted on the sides of a tank is greatest at the ____________ of the tank.

 
 
 
 

133.

Which of the following situations does not appreciably weaken the plate?

 
 
 
 

134.

Dry pyrophoric accumulations that can’t be cleaned out prior to inspection should be kept__________ during the inspection.

 
 
 
 

135.

Hydrogen blistering, caustic stress corrosion cracking and mechanical cracking are less frequently occurs in ___________.

 
 
 
 

136.

How can leaking rivets and rivet seams be repaired?

 
 
 
 

137.

When riveted seams are seal-welded, all rivets and seams with in ______ inches from the weld should be caulked.

 
 
 
 

138.

Defective rivets can also be replaced with __________________.

 
 
 
 

139.

List specific requirements when performing weld repairs to rivet heads and seams.

 
 
 
 
 

140.

When installing a new floor over an existing floor at least ________ inches of clean sand, or metal grating or concrete should separate the two floors.

 
 
 
 

141.

When installing a new floor over existing floor that is cathodically protected, the old floor should___________________.

 
 
 
 

142.

When installing a new floor over an existing floor that is cathodically protected, and the old floor is not removed, _______________ should be placed between the old and new floors.

 
 
 
 

143.

Prior to gouging out a crack, what should be done?

 
 
 
 

144.

Deep pits may be filled with _________________

 
 
 
 

145.

Prior to repairing a pit with a coating, the pit should be thoroughly cleaned by____________

 
 
 
 

146.

Leaks in tank roofs are often repaired using a ______________

 
 
 
 

147.

Good inspection records are the basis of ___________ inspection program.

 
 
 
 

148.

Tank records should be kept for the ____________ of the each tank.

 
 
 
 

149.

The item should be documented when internal or external tank inspections are performed.

 
 
 
 

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