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API510 > Lockhart day 1 > Flashcards

Lockhart day 1 Flashcards

1
Q

newly installed or change of service CR determination?(4)

A
  1. data of vessels in similar service
  2. owner user experience
  3. publish data
  4. on stream determination after 3-6 months of service
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2
Q

what % of water concentration in hydrofluoric acid can increase corrosion rates?

A

1.5%

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3
Q

what material are affect by mechanical fatigue?

A

all materials

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4
Q

mechanical fatigue is caused by?

A

cyclic stress over an extended period of time

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5
Q

what material does not have an endurance limit? (so it will fail after # of cycles)

A

300 SS
400 SS
aluminum and
other non ferrous steels

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6
Q

when is welding not recommend? what temp?

A

under 0F

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7
Q

recommend to warm the base metal to 60F?

A

when 0-32F

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8
Q

Std temp range for PT?

A

40 to 125F

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9
Q

temp where scaling potential increases due to CW corrosion?

A

> 140F

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10
Q

Min preheat temp when performing a local PWH in liwu of a full encirclement PWHT

A

300F (api 510 8.1.6.4.1)

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11
Q

temp where SCC becomes a concern?

A

> 140F

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12
Q

Temp where special procedure are needed for UT?

A

150F (Api510 5.7.2.3)

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13
Q

What temp does sulfidation begin?

A

> 450F

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14
Q

Internal inspection interval?

A

less of 1/2 RL
OR
10 years

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15
Q

external inspection interval

A

less of 5 years
Or
internal interval

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16
Q

when internal life is less than 4 years the INTERNAL inspection interval can be

A

full remaining life up to 2 years

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17
Q

thickness inspection interval

A

less of 1/2 RL
OR
10 years

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18
Q

CUI inspection for (4) (type of service/CS/SS/Duplex)

A
  1. intermittent service
  2. 10-350F CS
  3. 140-350F for SS
  4. 280-350 for dudplex
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19
Q

deferrals inspections up to (2)

A

LESS

  1. 6 months
  2. 10% of the inspection/servicing interval
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20
Q

deferrals of inspection repairs

A
  1. deferral of the repair shall be document in the inspection records
    AND
    have the concurrence with the appropriate pressure equipment inspection personnel (inspection/inspection supervisor)
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21
Q

review of inspection repair recommendations

A

inspector can be change or deleted after review of engineer or inspection supervision. SHOULD BE RECORDED with reasoning , date of change and name of person who did the review.

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22
Q

temper embrittlement temp range for low alloy steels and material?

A

650-1100F (API510 3.1.69) / low alloy steels 2 1/4 CR-1Mo

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23
Q

When should a CS be consulted when developing a inspection plan?

A

designate potential damage mechanisms

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24
Q

what material has the highest corrosion rate due to suffixation

A

CS

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25
Q

max temp to take UT thickness

A

1000F

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26
Q

pwht temp for CS?

A

1100F (UCS-56)

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27
Q

max temp for performing MT?

A

up to manufacture limitation

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28
Q

Design pressure for vessel asME VIII?

A

15PSI to 3000PSI (U1 h2)

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29
Q

Design pressure of non fired boilers that requires full RT?

A

> 50 psi (UW-2 c2)

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30
Q

min/preferred/max range for a pressure gauge during a Pressure test?

A

1.5x TP / 2.0 X TP / 4x TP

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31
Q

Superimposed back pressure is pressure coming from other sources when

A

PSV in close position. It may be constant or variable depends on the sources.

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32
Q

Built up back pressure is pressure generated as a result of fluid flowing through

A

PSV in open mode.

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33
Q

widely scatted pits can be ignored if all of the following are true (3)

A
  1. remaining thickness = 1/2 req thickness
  2. max area of pitting that is below the Ca has an area less than 7in2 within an 8” diameter
    (LW) + (LW) of all the pits
  3. sum of the length of pits within any 8” line DOES NOT exceed 2”
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34
Q

What should not be consider as an alteration?

A
  1. any comparable or duplicate replacement
  2. the addition of any reinforced nozzle less than or equal to the size of existing reinforced nozzles,
  3. and the addition of nozzles not requiring reinforcement.
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35
Q

API 510 is restricted to what kind of equipment?

A
  1. PV
  2. PRD
    placed in services
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36
Q

API 510 is developed for what industries/

A

refining and chemical

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37
Q

if conflict between ASME and API which should govern?

A

API 510

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38
Q

PH1 vs PH14

A

strong acidic/ strong alkanity

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39
Q

CUI inspection can be performed with UT from ____of the vessel

A

ID

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40
Q

examine of flanged joints for (4)

A
  1. leakage
  2. stains
  3. deposit
  4. drips
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41
Q

examine of flanged faces for (2)

A
  1. distortion

2. gasket seating services

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42
Q

examine of flanged fasteners for (2)

A
  1. corrosion

2. thread engagement

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43
Q

weld joint category A

A
  1. longitudinal welds in shell/nozzles

2. all welds in heads, hemi heads to shell weld joint

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44
Q

weld joint category B

A
  1. all circumferential welds in shell/nozzles

2. head to shell joint (if ellipsodial)

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45
Q

weld joint category c

A

flange welds

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46
Q

weld joint category d

A

nozzles attachment welds

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47
Q

weld joint types 1/2/3/4/5/6

A
  1. double welded butt joints
  2. single welded with backing
  3. single welded without backing
  4. double full fillet lap joint
  5. single full fillet lap joint with plug
  6. single full fillet lap joint without plug
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48
Q

category A > B because

A

A joint are under double stresses

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49
Q

RT 1
RT 2
RT 3
RT 4

A 
1/2 = full
3= spot
4 = combo of RT1/2/3
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50
Q

seamless parts for spot/no rt?

A

type 1 / 2 = 1.0 / 0.85

Type 3-6 = 0.85/0.85

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51
Q

max length of a crack, IP or incomplete fusion that is allowed in welds for a NEW vessel?

A

zero

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52
Q

max mill tolerance for flat plate?

A

smaller of
0.010”
OR
6% wall thickness

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53
Q

max discontinuities in a bend?

A

1/8”

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54
Q

min radius of a insert patch

A

1”

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55
Q

at what thickness is CS required PWHT?

A

> 1 1/2” (table UCS-56)

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56
Q

When the weld does not penetrate through the full thickness of the material, the minimum preheat and maximum interpass temperatures need only be maintained at a distance of

A

4 in. (100 mm) or four times the depth of the

repair weld, whichever is greater on each side of the joint.

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57
Q

min length of spot radiograph?

A

6”

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58
Q

what vessel size is excluded from ASME VIII?

A

less than 6” ID

59
Q

depth to dig at soil to air interfaces? Where is the most serve corrosion located?

A

Good judgment /

the most severe corrosion will usually be found between ground level and up to several inches below.

60
Q

The ______ is responsible to assure that all individuals taking thickness readings are trained and
qualified in accordance with the applicable procedure used during the examination.

A

owner/user

61
Q

For a corroded area of considerable size the wall thicknesses may be averaged over a length NOT EXCEEDING the following: (2)

A

LESS THAN ID 60 in. (150 cm), 1/2 the vessel diameter or 20 in. (50 cm), whichever is less;
OR
ID GREATER 60 in. (150 cm), 1/3 the vessel diameter or 40 in. (100 cm), whichever is less.

62
Q

The following criteria must be met in order to use thickness averaging: (6)

A

— the region of metal loss has relatively smooth contours without notches (i.e. negligible local stress
concentrations),
— the equipment does not operate in the creep range,
— the component is not in cyclic service,
— a minimum of 15 thickness readings should be included in the data set,
— minimum reading must be included in the thickness average;
— lowest individual reading cannot be less than 50 % of trequired

63
Q

hydrogen blister occurs?

A

below/above liquid level

64
Q

hydrogen blister occurs?

A

below/above liquid level

65
Q

cUI most susceptible areas include: (7)

A

a) above insulation or stiffening rings;
b) nozzles and manways;
c) other penetrations (e.g. ladder clips, pipe supports);
d) damaged insulation with areas of potential water ingress;
e) areas with failed insulation caulking;
f) top and bottom heads;
g) other areas that tend to trap water.

66
Q

ellipsoidal heads E = ?

A

E=1 unless otherwise say it is welded

67
Q

Each welder and welding operator shall stamp
the identifying number, letter, or symbol assigned by
the Manufacturer, on or adjacent to and at intervals of
not more than _________

A

3 ft (1 m)

68
Q

heating the vessel in more than one heat in a furnace, provided the overlap of the heated sections of the vessel is at least ______

A

5 ft (1.5 m)

69
Q

One spot shall be examined on each vessel for

each________ increment of weld

A

50 ft (15 m)

70
Q

Min time to wait for checking for delayed cracking after welding SS cladding ?
And for what material?

A

24 hours by UT

P3 P4 and P5

71
Q

The _________ shall use welders and welding procedures that are qualified in accordance with ASME Code, Section IX

A

repair organization

72
Q

Corrective procedures should be utilized when metal temperatures (typically above _____impact
the accuracy of the UT thickness measurements obtained.

A

150 °F [65 °C])

73
Q

what % of Nickle makes it an alloy a Nickle base alloy?

74
Q

Before any repairs or alterations are performed, all proposed methods of design, execution, materials,
welding procedures, NDE, and testing shall be approved by the ___________

A

inspector and engineer.

75
Q

The welding shall be limited to the (3)

A

SMAW, GMAW, and GTAW processes

76
Q

corrosive service, the wall thickness

A

t = tactual– 2(Crate X Iinternal )

77
Q

3 factors that can effect the resistance of crushing due to external pressure?

A
  1. thickness
  2. Diameter
  3. stiffeners
78
Q

impact tempest lowest temp if stress ratio is NOT LESS THAN 0.35

79
Q

_______shall verify that welders are welding
within their ranges qualified on the welding procedure qualification(s) and within the ranges on the specified welding procedure specification (WPS).

A

Inspectors

80
Q

how many specimen needed for charpy impact test?

81
Q

charpy test impact

A

ONLY 1 of 3 allowed to be less than min required (no less than 2/3)

82
Q

throat size

A

= 0.707 * leg size

83
Q

leg size =

A

throat / 0.707

84
Q

leg size =

A

throat / 0.707

85
Q

fillet leg size nears to round to the nearest

A

16th of an inch

86
Q

external interval

A

LESSOR of 5 years or internal interval

87
Q

2 main requirement to perform an onstream in lieu of an internal inspection?

A
  1. he general corrosion rate of a vessel is known to be less than 0.005 in. (0.125 mm) per year;
  2. the vessel remaining life is greater than 10 years;
88
Q

all longitudinal weld are what category?

89
Q

all circumferential weld are what cateogory?

90
Q

code for confined space?

91
Q

code for confined space?

92
Q

MAWP is a ___ of the vessel?

93
Q

stamp used for RV

94
Q

stamp for lethal service

95
Q

max set pressure for a single PRD for a vessel?

96
Q

purpose of controlled deposition welding?

A

refinement of the grain structure

97
Q

preferred inspection for SCC?

98
Q

A pressure test is normally required (2)

A

after an alteration or major repair.

applied if the inspector believes that one is necessary and specifies it in the repair plan

99
Q

For a large vessel with two or more zones of differing corrosion rates,

A

each zone may be treated independently when

determining the inspection intervals or for substituting the internal inspection with an on-stream inspection.

100
Q

who is responsible to maintain qualified welding procedure use for repairs/alteration

A

repair organization

101
Q

who is responsible to maintain qualified welding procedure use for repairs/alteration

A

repair organization

102
Q

Local PWHT may be substituted for 360° banding on local repairs on all materials, provided that the followin precautions are taken and requirements are met.

A

a) The application is reviewed, and a procedure is developed by an engineer experienced in the appropriate
engineering specialties.

103
Q

Local PWHT may be substituted for 360° banding on local repairs on all materials, provided that the followin precautions are taken and requirements are met.

A

a) The application is reviewed, and a procedure is developed by an engineer experienced in the appropriate engineering specialties.

104
Q

common metal with an endurance limit?

A

CS / Low alloy / TI

105
Q

common metal W/O endurance limit

A

300 /400 / aluminum

106
Q

-P # allowed to use preheat in lieu of PWHT

107
Q

P # allowed in CDW in lieu of PWHT?

108
Q

P# should be examine for delayed cracking after repairs to SS cladding?

109
Q

circumferential weld joint category? (except)

A

B except shell to head for hemi

110
Q

two main gamma ray siotopes for RT?

A

Iridium 192 / Cobalt 60

111
Q

how should relief valve be trasnported

112
Q

max taper required for a pressure vessel with mismatch?

A

3 to 1 (UW-9c)

113
Q

what qualifies a weld in all position

114
Q

charpy impact test for?

115
Q

what must be in the bent potion of a guided bend specimen?

A

weld and HAZ

116
Q

2 activities must be done before an inspection can defer?

A

perform a satisfactory review of the equipment history and appropriate risk analysis

117
Q

the RBI assessment shall be reviewed and approved by the_______ at intervals

A

engineer and inspector

118
Q

large vessel with 2 or more zones?

A

each zone may be treated independently

119
Q

PRD repair organization must have ?

A

QC program

120
Q

hydro test pressure is

A

1.3 X MAWP x LSR

LSR = Stress at Test Temp/ Stress at Design pressure

121
Q

On the new welds, the

welder should stamp the weld with their ID mark every

122
Q

burn through

A

excessive visible root reinforcement in a joint welded from one side or a hole through the root bead.

123
Q

pneumatic test pressure

A

1.1XMAWPxLSR

124
Q

pneumatic pressure test shall increase to____- of test pressure and increase in step of _____ until test pressure is reached AND then decrease to the test pressure

125
Q

metal temperature during pneumatic test should be ____above MDMT

A

atleast 30F

126
Q

hydro test pressure be at the ____ of the vessel

127
Q

hydrostatic INSPECTION presssure

A

is hydro test pressure / 1.3

128
Q

the repair for stainless Steel Weld Overlay and Cladding shall be inspected by the

129
Q

Crack-like flaws and environmental cracking shall be assessed by an

A

engineer and/or corrosion specialist

130
Q

Preferential weld corrosion shall be assessed by

A

the inspector

131
Q

Pressure-relieving devices shall be tested and repaired by a (2)

A
  1. repair organization qualified and
  2. experienced in relief valve maintenance
  3. QC
132
Q

The inspector will designate the hold points that are required for repairs and alterations.
The inspector may give prior general authorization for limited or routine repairs that will not require a

A

pressure test

133
Q

after repairs who shall verify?

A

inspectors

134
Q

Temporary repairs may be conducted on pressure vessels as long as the

A

inspector and engineer

135
Q

UT The maximum speed of scanning should be

A

stated in the procedure.

136
Q

Calculations performed by either the _______ for rerate

A

manufacturer or an owner/user engineer

137
Q

________ can be substituted for internal inspections only when the vessel is too small to safely enter or all
internal surfaces c

A

Manway or inspection port inspections

138
Q

leak test should be perform

A

if the inspector think it is necessary.

139
Q

Repairing a crack at a discontinuity, where stress concentrations are high (e.g. crack in a nozzle-to-shell weld), should not be attempted without prior consultation

A

with an engineer

140
Q

welders cannot qualify under what OD?

A

2 7/8 , needs to be higher than 2 7/8

141
Q

type of repair can be made with a pipe cap?

A

permanent repair of a localized corroded area

142
Q

pneumatic INSPECTION pressure

A

pnematic test pressure / 1.1

(step 7)`

143
Q

MT equipment should not vary by more than?

API510 (6 decks)

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