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API 575 > Section 8 - Methods of Inspection > Flashcards

Section 8 - Methods of Inspection Flashcards

1
Q

Safety precautions dealing with tank entry are discussed in

A

API 2015 & 2016

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2
Q

Prior to entering a tank, be sure to:

A

Check condition of overhead structures inside the tank

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3
Q

Prior to entering a floating roof tank, be sure to

A

Check that there is not a significant amount of liquid on the roof.

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4
Q

Prior to conducting a tank inspection, the inspector should:

A

read previous inspection reports

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5
Q

Which handrail member should be given special attention

A

Angle Iron
Bars
T-bars
Tubular–

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6
Q

Which document provides info concerning the use of tank grounding to prevent static electricity

A

API 545

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7
Q

Which coating problem is the most difficult to detect

A

Blister
Bonding failure –
Holiday

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8
Q

A tank is insulated. Where is a likely spot for external shell corrosion

A

Shady side of the tank

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9
Q

CUI in carbon steel is most aggressive at a temp range of:

A

120 - 200 F

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10
Q

The upper shell of a floating roof tank has the potential for atmospheric corrosion on both sides. On floating roof tanks with uncoated shells, special attention should be given to the shell on the upper:

A

24”

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11
Q

Hydrogen blistering is most common on the tank’s

A

bottom and shell

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12
Q

Hydrogen blistering occurs on the tank’s

A

external and internal

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13
Q

Which of the following is not a cause of tank deformation

A 
Defective vent
Earthquake
Settlement
Wind
Exceeded product fill height--
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14
Q

When cracking is suspect in an area of tank deformation, which NDE is preferred?

A

MT

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15
Q

How can rivets be checked for tightness

A

Light tapping one side and fingering the other side

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16
Q

Planks used as a walkway on the roof should span at least

A

2 rafters

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17
Q

A floating roof tank is in a volatile service. When walking on the floating roof, it is advisable that the tank be

A

High gauged

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18
Q

A floating roof is in a volatile service and is 1/2 full. What is a requirement when walking on it?

A

Must wear respiratory equipment unless the air is tested

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19
Q

A floating roof is sitting on it’s legs. A blocked roof drain can cause

A

Sever roof damage

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20
Q

External roof corrosion is most common at

A

Roof Depressions

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21
Q

What should be done if there is significant distortion discovered at a nozzle?

A

Clean and examine the distorted area for cracks

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22
Q

What is a common problem for flame arrestors?

A

Internal screens get plugged

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23
Q

Which of the following is not a common way for flame arrestors to get plugged?

A

Bees, mud daubers or insects
corrosion build up
solidification of tank vapors
tank over pressure–

24
Q

Which of the following is NOT a problem that can occur if a flame arrestor gets plugged

A

Tank over pressures
Tank roof-to-shell weld fails
Tank sucks in due to vacuum
Floating roof sucks in–

25
Q

What is a useful method for checking the tank bottom for soil-side corrosion

A

ROBOTS

26
Q

The owner elects to tunnel under a tank to visually inspect a portion of the soil-side of the tank bottom. What is the primary problem with tunneling?

A

Difficult to compact the fill

27
Q

When cutting rouf coupons, the coupons must have

A

rounded corners

28
Q

If there are leaks in a floating roof or the pontoons, what is likely to occur?

A

The roof may tilt and turn upside down.

29
Q

Which of the following is not commonly installed on a floating roof

A

Drains
Grounding Connections
Guides
Cathodic Protection–

30
Q

During an outage, the floating roof drain lines should initially be pressure tested for 1/2 hour. The test should normally be conducted at

A

30 psig

31
Q

If a drain line contains a swing joint, a second 1/2 hour pressure test should be conducted at

A

5 psig

32
Q

What is the reason for a 2nd pressure test of a drain that has a swing joint?

A

The joint may be self sealing at high pressures, but leaks at low pressures

33
Q

When walking on an aluminum internal floating roof:

A

it’s best to add planking prior to walking on the tank

34
Q

Aluminum floating roof legs must be:

A

Electrically isolated from carbon steel to prevent galvanic corrosion

35
Q

Normally internal tank corrosion is least likely to occur

A

On the bottom
At the liquid-level line
In the vapor space
inside nozzles –

36
Q

Pyrophoric material tends to collect on the

A

Floor and top side of the rafters

37
Q

Pyrophoric material should be

A

kept moist until removed

38
Q

In sour services, corrosive vapors are formed when moisture and air mixes with

A

Hydrogen sulfide

39
Q

In a 98% sulfuric acid tank, corrosion often occurs in the

A

Vapor-liquid interface

40
Q

In a 98% sulfuric acid tank, corrosion occurs in the vapor-liquid interface, this is because the

A

water on top of the acid that creates a weaker acid

41
Q

In tanks that are rarely used, like pipeline breakout tanks, corrosion often occurs

A

behind the tank seal

42
Q

Some incomplete penetration on circ shell welds

A

was allowed in API 650 prior to the 7th edition

43
Q

Which of the following carbon steels are the most susceptible to hydrogen blistering?

A

Those with laminations and slag inclusions

44
Q

A statistical method is used to determine the probable minimum remaining thickness of a tank bottom. Typically how much of the bottom is scanned to gather info for the statistical analysis?

A

0.2-10%

45
Q

A statistical method is used to determine the probably minimum remaining bottom thickness. What part of the floor should be included in the statistical analysis

A

Outer circumference by the shell

46
Q

When is a statistical analysis of a tank floor effective?

A

Tanks on pads that have uniform consistency

47
Q

MFL Scanning equipment is useful for finding

A

Both top-side & bottom-side corrosion on coated & non-coated floors

48
Q

MFL scanning equipment may miss

A

Sharp small diameter isolated pits

49
Q

On the tank bottom, removing a coupon is an effective method for

A

determining root cause of soil-side corrosion

50
Q

A method to use when checking for shell cracks is to put penetrant on one side of a the shell and developer on the other. How long might it take to detect a crack?

A

24 hours

51
Q

What type of lined tanks should be painted on the outside with a unique color or a warning stenciled, that indicates this tank has a special lining?

A

Glass-lined

52
Q

Steam heating coils should be inspected using either RT or UT to detect:

A

Condensate Grooving

53
Q

A hydrotest is performed on a tank of high alloy. What is one major concern?

A

Chloride stress corrosion cracking

54
Q

An air-test is substituted for a tank hydro. The air pressure should not exceed:

A

2 inches of water

55
Q

Vacuum box testing is being performed on the roof welds. What types of leaks might be missed?

A

Very small leaks and large leaks.

API 575 (10 decks)

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