lockhart day 4 training Flashcards
1
Q
PQR must be….
A
signed and dated
2
Q
WPS must be qualified by
A
manufacturer or contractors
3
Q
WPS provides what
A
direction to welder for making production welds
4
Q
WPS must address (3)
A
- essential
- non essential variables
- supplementary variables ( if required)
5
Q
PQR does what?
A
establish the properties of the weld ONLY not welder
6
Q
PQR must address (2)
A
- essential
- supplementary variable (if required)
7
Q
WPS qualified in 1962 or later
A
can still be used
8
Q
WPS qualified in 1962 or prior
A
can be used ONLY if all 1962 requirements are met
9
Q
interpass temp?
A
highest temp allowed in weld or weld joint between pass
10
Q
lower transformation temp is what and what happens?
A
1330F - ferrite begins to transform into austenite
11
Q
upper transformation temp is what and what happens?
A
1600F - from ferrite to austenite is COMPLETE
12
Q
who responsibility to qualify WPS and welders?
A
organization
13
Q
who maintain welding records?
A
manufacturer shall maintain results of WPS and welders qualification
14
Q
How often to do settlement sruvey? (3)
A
before , during, and after hydro
15
Q
how long must radiographs be retained
A
1 year
16
Q
How often must API653 be renewed?
A
3 years
17
Q
how often an inspector required to be recertified
A
6 years
18
Q
amount of time involved in inspection to keep API653 cert.
A
20%
19
Q
When is CUI most severe?
A
170-230F
20
Q
Where is MIC often found?
A
stagnant or low flow areas
21
Q
How can caustic stress corrosion cracking be preventwed
A
PWHT at 1150F
22
Q
Where is sulfuric acid most affect area for severe corrosion in CS?
A
HAZ
23
Q
why is P number used?r
A
reduce the # of welding procedure qualification
24
Q
Why is F # used?
A
reduce # of welding procedure/performance qualification
25
tension test is to determine?
ultimate stregnth
26
Requirement of tension test for base/weld metal and if 2 metals
1. Base metal at least 95%
2. Weld metals - 100%
3. if 2 metals then weakest of the 2 base metals
27
Guided bend test to determine
ductility / soundness of groove weld joints
28
RT and UT can replace what test?
bend test
29
what are the requirement thickness for plates/pipe for <<1' and >1" for test specimen
<< 1" = full thickness
| >1" = full thickness OR multiple specimen
30
reduce sections for plates/ pipes requirement?
1. plates = all thickness
| 2. pipe > 3"
31
what happens to CS with sulfuric acid if flow rate is 5fps?
increase CR when velocity is at 2-3 fps
32
What happens when water is mixed with sulfuric acid
diluted acid causes heat to be release, increasing CR
33
How to prevent sulfuric acid?
add caustic to neutralize
34
Reason for geodesic dome on a tank?
prevent vapor loss to eliminate the need for water draw off
35
Coating may affect UT reading, what to do for UT?
compensate for the coating
36
recommend size of coupon to remove for testing soil corrosion?
12" min
37
VI angle min?
min 30 degrees
38
penetrating oil is spray on the outside of the shell to weld for a test, what is another name?
wicking
39
what size discontinuity is allowed for bend test?
Less than 1/8" in any direction on convex surface
40
Are open discontinuity at corner acceptable?
all unless > 1/8"
41
What is VI used to qualify for?
performance not PQR
42
When are welds to be inspected ?
after weld and before specimen is removed
43
What can RT and UT substitute for?
groove bend test / mechanical test
44
why is 2 pass welding recommend for seal welding leaking rivets?
allow for poor first pass due to hydrocarbon contamination
45
what are the 4 components of a corrosion cell
ACME , anode , cathode, metallic path, electrolyte
46
soil rate corrosion increase at what pH and decreases at what pH?
1. increase when pH <5
| 2. decrease when pH >8
47
CR of bottom steel may double with what temperature?
may double with 18F above 77F
48
require overlap for a single welded bottom plate lap joint?
not to exceed 1"
49
min offset of vertical welds in adjacent shell courses?
min 5t (t = thickness of thicker plate)
50
required size of fillet weld for lapped bottom plates?
full fillet welds
51
min distance required between 3 plate lap joints with tank shell, annular plate
12 "
52
require type of joint for annular plate?
butt weld
53
what is required radially distance from the annular plate to shell joint and any lap welded bottom joint?
24"
54
production welds must be qualify by (3)
1. RT or UT
2. VT and mechanical
3. VT and RT/UT
55
WPQ is welded in accordance with a
WPS
56
can preheat/PWHT be omitted for WPQ if required by WPS?
yes can be omitted
57
What welds cannot be qualified with RT. (2)
1. GMAW-S and
| 2. P21-P25, 51-53, 61,62 for all process except GTAW
58
UT is limited to what thickness for weld qualification
1/4", cannot UT under 1/4"
59
min length required for RT to qualify a welder
6"
60
min length required for RT to qualify a welding operator
3 feet
61
requalification test if fail VT?
2 coupons, 1 for VT and 1 bend
62
requalification test if fail bend test?
2 coupons, both must pass bend or RT
63
requalification test if fail RT ?
2 coupons , retest RT twice the required length
64
when does welder qualification expires (2)
1. welder has not use process for 6months
| 2. reason to question welders ability
65
how to requalify welding if qualification expires?
weld coupon ANY size/position then, VT/Band or RT
66
WPQ must contain? (6)
1. variables used
2. essential variables
3. type of test
4. test results
5. ranges qualified
6. certifications
67
What is require PWHT for insert plates and penetration >1"
1100-1200 F
68
min allow sloped for cone roof
1:16
69
max allow slope for frangible roof?
2:12
70
max allow diameter requirement on surface porosity cluster ?
3/32"
71
min distance of a surface porosity?
4"
72
what design metal temp are vertical shells welds required to be impact tested for a PQR?
Less than 50F
73
WPS contains? (3)
1. essential
2. non essential
3. supplementary if required
74
PQR contains? (4)
1. essential
2. supplementary if required
3. range of variables used to make the coupon
4. must be certified by manufacturer/contract (signed/dated)
75
When does WPS needs to be requalified?
changes to essential and supplementary
76
WPS must be readily available when?
at the fabrication site for review
77
PQR is to?
record of the welding data used to make the test coupon and test results
78
When is PQR recertified?
when ANY changes (except for editorial changes)
79
PQR must be available for whom?
AI not the welder
80
How many PQR for a wPS?
could be multiple
81
What tests can NOT be done for WPS/PQR
RT/VT
82
What test to do on WPS/PQR?
bents and tension test
83
WPQ NDE test requirements
VI/Bend, RT/UT
84
when is preheat done ? (2)
1. when 0-32F
| 2. base metal >1"
85
preheat temp requirement? (temp and distance)
140F and within 3"
86
preheat temp at 1.5" thickness
200F
87
when low h2 electrode required? (3)
1. t >1/2" - group 1-3
2. Group Iv-vI
3. temp attachments to welded material in IV-VI
88
reconstructed tank / new tank plumpness?
1. 1/100 , max 5"
| 2. 1/200
89
what is definition of plumpness
offset of the top of the shell to the bottom of the shell
90
WPS / PQR is qualified by what code?
ASME Section IX
91
Welders are qualified by
ASME Section IX
92
NDE procedure accordance for RT/MT/UT/PT?
ASME section V
93
VT procedure accordance?
Manufacturers requirement
94
Personnel qualification for RT/UT
Level II/III
95
Personnel qualification for MT/PT
competent in technique
96
When is PT/MT used? (4)
1. cavities from gouging/grinding
2. nozzle to shell weld
3. repads
4. welds thicker than 1"
97
NDE used for new shell to bottom welds? (4)
1. diesel oil
2. right vacuum box
3. pressuring cavitywith 15 psig
4. LT
98
NDE used for new bottom (3)
1. vaccum box
2. tracer gas
3. hydro with 6" of level
99
how many settlements are needed for NEW tanks?
6, before, .25, .5, .75, 1, and 24hours and after tank is empty
100
RT extent for penetration using insert plates?
100% RT
