Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

api 653 chapter 8 > API653 API575 > Flashcards

API653 API575 Flashcards

1
Q

atmospheric pressure code?

A

API650

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

definition of low pressure storage tanks?

A

operate at pressures in their gas or vapor spaces exceeding the 2.5 pounds per square inch gauge
pressure permissible in API Standard 620

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

API2000?

A

Venting requirement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

External corrosion (5)

A

a. External (underside) tank bottom corrosion results from contamination in the pad. Cinders contain sulfur compounds that become very corrosive
when moistened.
b. Electrolytic corrosion (pitting type) results when clay, rocks, oyster shell, wooden grade stakes, etc., come in contact with the underside bottom, as
they attract and hold moisture.
c. Poor drainage from faulty pad preparation.
d. Lower external shell corrosion due to:
i. Settlement, with corrosion at soil grade line
ii. Casual water collection point
iii. Insulation moisture “wicking”.
e. Shell appurtenances are subject to crevice corrosion at non-seal welded
joints (angles/flats).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

internal corrosion (4)

A

a. Primarily dependent on product stored.
b. Corrosion resistant linings are most common preventative.
c. Normal locations and causes are:
i. Vapor space (above the liquid). Most commonly caused by H2S vapor,
water vapor, oxygen or a combination of the three.
ii. Liquid area. Most commonly caused by acid salts, H2S or other sulfur
compounds.
d. Other forms of internal attack, considered as forms of corrosion are:
i. Electrolytic corrosion.
ii. Hydrogen blistering.
iii. Caustic Embrittlement.
iv. Graphitic corrosion (cast iron parts). (?)
v. Dezincification (brass parts). (?

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

areas covered by the stored liquid, corrosion is commonly due to (4)

A

acid salts, hydrogen sulfide or bottom sediment and water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

internal inspection test for FULL bottom? (3)

A

inspection of the entire tank bottom by using

  • Magnetic Flux Leakage
  • UT type techniques
  • Hammer testing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Protective Coating failure (5)

A

Rust spots, blisters, peeling, cracking and coating due to lack of adequate bond, are all types of common paint failure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Cracks can result from a wide variety of causes. The more frequent causes are: (5)

A

i. Faulty welding.
ii. Unrelieved stress concentrations (i.e., stress raisers) around fittings or
appurtenances.
iii. Stress caused by settlement or earth movement, especially differential settlement
iv. Vibration
v. Poorly designed repair or “sloppy” craftsmanship.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

CUI is most aggressive at what temp?

A

170-230F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How to detect hot spots in piping? (2)

A
  • thermography

- neutron back scatter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

except for cast iron parts, coils and support should be…inspected by NDE (2)

A

UT or Hammer tested

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Thoroughly method of inspection non metallic lining?

A

Holiday testing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

grounding connection should not exceed … ohms?

A

25

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How often should flame arrestors be inspected? (2)

A
  • appropriate intervals

- after an explosion in a tank connected to a gas collecting system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

cone roof can be as large as?

A

300 feet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

API620 - atmosphere pressure means not exceeding what?

A

internal pressure not exceeding the weight of the roof plates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

API650 atm pressure define?

A

up to 2.5 psi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

API 650 atm pressure mean?

A

not exceeding 2.5 psi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

api 572

A

inspection of PV

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

2 most common types for tank roofs?

A
  1. fixed

2. floating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

cone roof are normally self-supporting for what diameters?

A

60 feet or less

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What external floating roof is not permitted per Annex C or API650?

A

Pan type

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is pan type roof flaw?

A

Prone to sinking

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

definition of low pressure storage tanks?

A

exceeding 2.5 psig but not greater than 15 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

cone/domed roofs are typically designed for up to what pressure

A

up to 5 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Which type of roof is typically constructed with Aluminum?

A

geodesic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

most common type of floating roof seal?

A

shoe seal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

API 620 appendix R addressed product from what temperature?

A

40 to (-)60F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

What is a recognized tank inspection standards? (4)

A
  1. API STD 12R1
  2. API 653
  3. EEMUA 159
  4. STI SP001
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

chemical in the cinder would cause corrosion?

A

sulfur

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

What is not recommend sealant for tanks?

A

Asphalt impregnated fiberboard

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

concentration cell corrosion can occur at?

A

rivet tanks niches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

API 571?

A

Damage mecahnism

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

crude oil tanks are constructed of what material typically

A

CS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

what causes corrosion in vapor space? (3)

A
  1. hydrogen sulfide
  2. water vapor
  3. oxygen
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

caustic cracking is normally on?

A

coil or heating units

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

What does it have to contain to causes SCC? (3)

A
  1. Ethanol
  2. DEA
  3. Caustic
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

external corrosion can occurs to horizontal tank on

A

saddle supports

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

3 late lap welds are prone to ?

A

leaks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

where are crack like flaws typically occur in large storage tanks

A

shell to bottom welds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

large or uneven amount of settle can cause?

A

nozzles with attached piping become over stressed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

API 653 Annex c?

A

inspection checklist for tanks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

inspection plans should be developed by (4)

A

AI, engineer, CS, and operations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

API 580>?

A

RBI

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

What are factor of probability of failure (3)

A
  1. probable damage mechanisms
  2. current tank condition
  3. past inspection effectiveness.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

what are factors for consequence of failure? (4)

A
  1. potential for injuries
  2. loss of containment
  3. environmental impacts
  4. loss of production
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

new tanks have their original plate thickness based on? (2)

A
  • specific gravity

- hydro static test requirements

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

stresses are highest

A

bottom to shell joint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

stresses decrease or increase due to external pressure loadings as you move up in the tank shell?

A

does not decrease as you move up the tank shell.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

pitting of tank bottoms plates is a factor in establish inspection intervals?

A

YES

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

pit or a small area corroded down to retirement thickness (4)

A
  1. does not weaken the shell plate
  2. may result in a leak
  3. does not weaken the shell plate
  4. should be eliminated
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

internal inspection is governed by CR at where?

A

corrosion rate of the tank bottom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

similar service is used for what?

A

tank bottom corrosion rate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

product side corrosion is usually cause by

A

water bottoms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

api 2015

A

safe entry and cleaning

57
Q

bolts set in concrete is subject to?

A

crevice corrosion

58
Q

additional attention should be given to what type of handrails?

A

tubular

59
Q

crevices at bracket connections, bolts and nuts, and between stair tread and support angles should be inspected with what (2)

A
  1. knife/scrapper

2. hammer

60
Q

what to do when platform is found to accumulate water?

A

drill a hole

61
Q

best way to check for anchor bolt for corrosion? (1)

A

tapping with hammer

62
Q

ground connection is govern by what code?

A

API RP2003 (Protection Against Ignitions Arising Out of. Static, Lightning, and Stray Currents)

63
Q

which part of the tank experience accerlerated coating failure?

A

roof

64
Q

hammer testing should not be done (2)

A
  1. hydro

2. in service

65
Q

special attention should be given to the upper ____ (inch) of uncoated shells of floating tank roofs

A

24”

66
Q

wind girders and stiffeners inspection method (2)

A

VI and hammer

67
Q

type of deterioration is manifested in tank due to amine or caustic service?

A
  1. cracks that start on inside of the tank and progress through the outside
68
Q

what substances leaking due to cracks caused by caustic?

A

white salts

69
Q

what happens if cracks are not thoroughly cleaned caused by caustic?

A

cracking will get worse

70
Q

hydrogen blistering normally found where (location )

A

shell and bottom of tank

71
Q

hydrogen blister can occur on external and/or internal?

A

both external / internal

72
Q

how can you located hydrogen blistering?

A

VI with light parallels to tank surface

73
Q

cracks typically occur (3) - what locations

A
  1. nozzle connection
  2. shell to bottom welds
  3. supports/bracket connections
74
Q

NDE methods for cracks? (2)

A

MT or PT

75
Q

inspection NDE for thinning of head/roof? (2)

A

UT or MFL

76
Q

roof inspection by hammer testing what may happens that is NOT good

A

may dislodge rust scale into store product

77
Q

how should roof be inspected? What should be put on the roof

A

plank long enough to span 2 roof rafters

78
Q

inspector should do walk on?

A

weld seams

79
Q

floating roof should be as _____ if volatile liquid is in the tank ..

A

high as possible

80
Q

what to do if a tank is half full during the inspection of the floating roof?

A

(1) perform atm testing if respirator is not worn
2. wear respiratory equipment if no atm testing
3. post a 2nd employee with respiratory equipment

81
Q

if max operating level is exceed what can happen to the floating roof?

A

damage to the floating roof seals

82
Q

what happens if floating roof drains are blocked?

A
  1. could sink and/or damage
83
Q

how many inches of buried piping should removed for inspection?

A

6-12”

84
Q

What to do when nozzle distortion is discovered?

A

clean shell and all seams down to parent metal and examine with PT or MT

85
Q

flame arrestors routinely ?

A

inspect for cleanliness and corrosion

86
Q

if tank is lifted , what test to be done?

A

hydro

87
Q

what is a problem for tunneling?

A

hard to compact the fill in the tunnel area

88
Q

roof rafters inspected by coupon, requirements?

A
  1. 12 x 12

2. round corners

89
Q

leakage in the roof deck or in the pontoons can cause (2)

A
  1. unbalance and

2. roof hang up on the shell

90
Q

how to control pyrophoric deposition is found in API?

A

2015

91
Q

pyrophoric deposition is to be kept

A

moist

92
Q

98% sulfuric acid , where would most severe corrosion occur? and why?

A

liquid to vapor interface, water will float

93
Q

pipeline breakout tank where is susceptible?

A

behind floating roof seals

94
Q

corrosion on floating seals typically occurs as a band of corrosion , and most severe at ?

A

hAZ

95
Q

incomplete penetration of circumferential shell weld seams were permitted when?

A

tank built prior to 7th edition of api650

96
Q

where in CS tanks are more prone to hydrogen blistering?

A

contains lamination or slags

97
Q

SCC thrives at what temp

A

> 150F

98
Q

MFL cannot detect?

A

sharp isolated pitting

99
Q

what is recommend for assessing soil side corrosion?

A

coupon

100
Q

statistical analysis method , how much of tank must be scanned

A

0.2% to 10% of tank bottom

101
Q

when using scanning methods to check for tank bottom corrosion, what else should be included?

A

outer circumference next to the shell

102
Q

top side and bottom side corrosion is present, what is best inspection?

A
  1. MFL and coupon removal
103
Q

cracks in shell or shell to bottom welds, liquid penetrant or diesel dwell time?

A

24 hours

104
Q

aluminum legs should be?

A

isolated from CS to prevent corrosion

105
Q

drain lines can be hydro at what pressure for at least 30 min

A

30 PSIG

106
Q

if drain lines contain swing joints what pressure tested after 1st test of 30 PSIG

A

5 PSIG

107
Q

structural members inside the tank can experience what rate of corrosion?

A

2x the corrosion on the shell/roof

108
Q

what to use to measure corrosion on structural members (3)

A
  1. UT
  2. Transfer calipers
  3. steel rule
109
Q

check for soundness of structural memebers?

A

light hammer taps

110
Q

steam coils should be checked for ?

A

condensate grooving

111
Q

what to consider for hydrotesting high strength or high alloy steels

A

Chloris SCC

112
Q

if no water for hydo, what pressure can is to be set for pneumatic pressure?

A

no more than 2” of water pressure

113
Q

what can be missed for vaccum box for roof seams?

A

large and small leak may not be detected

114
Q

APi 334?

A

leak detection for AST

115
Q

how many procedure associated with determining the hydraulic integrity?

A

11

116
Q

How close must the eyes be for VI

A

24”

117
Q

What angle for VI?

A

angle of not less than 30 degree

118
Q

VI lumens? general / small anomalies

A

min 15 foot candles / 25 lumens / 50 foot candles/100 lumens

119
Q

min dwell time for using penetrating oil/dye penetrant for shell to bottom weld

A

12 hours

120
Q

air pressure requirement? for checking the inside surface with an indicator solution

A

no more than 3” of water pressure

121
Q

air pressure requirement? for checking the inside surface with 6” of level of water, with an indicator solution

A

max 9” of water pressure

122
Q

how to increase effectiveness of tank bottom leak testing?

A

tapping entire bottom with an air operated hammer

123
Q

leak testing can be achieved by installing a clay dam around the perimeter of tank and filling with and how many inches?

A

6 “ height of water

124
Q

another testing method for bottom tank is use inert gas, what is advantage?

A

repairs can be made without removing the inert gas and retest is immediate.

125
Q

key element for to mass balancing is (2)

A

pressure and temperature

126
Q

marker chemical leak detection method key is?

A

injecting a volatile chemical into the process or hydrotest water, and detectors installed below the tank bottoms

127
Q

chemical marker solution to be ?

A

1-10 ppm

128
Q

chemical marker sensor to be what distance away?

A

no more than 20feet from tank bottom

129
Q

what sensors are used for AET?

A

accelermeter

130
Q

what is limitation of AET?

A

distinguishing the sound from the leak from ground sounds

131
Q

leaking rivet can be repaired by ? (3)

A
  1. welding
  2. bolting or re-riveting
  3. caulking/coating
132
Q

weld repair on rivet heads or seam should (5)

A
  1. use small diameter electrodes
  2. set welding machine at low amperage
  3. keep weld beads small
  4. use back step bead application
  5. lightly ring weld rivet heads
133
Q

risk associated with weld repair on rivets

A
  1. leak in adjacent seams
  2. leak in adjacent rivets
  3. leaks develop at the stopping point of the weld repair
134
Q

what needs to be done if a door sheet is cut all the way down to shell to bottom weld?

A

hydro

135
Q

dual element transducers can measure what “

A

.05-1”

136
Q

UT overlap requirement?

A

min 10% of transducer diameter

137
Q

large diameter transducer

A

will not detect small diameter pits

138
Q

phased array UT? (3)

A

ultra high data point density , corrosion mapping, discrimination of mid wall anomalies

139
Q

tanks bottom scanning can successfully scan what % of tanks?

A

80% of the tank bottom

api 653 chapter 8 (36 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions