Lockhart day 1 Flashcards
(143 cards)
1
Q
newly installed or change of service CR determination?(4)
A
- data of vessels in similar service
- owner user experience
- publish data
- on stream determination after 3-6 months of service
2
Q
what % of water concentration in hydrofluoric acid can increase corrosion rates?
A
1.5%
3
Q
what material are affect by mechanical fatigue?
A
all materials
4
Q
mechanical fatigue is caused by?
A
cyclic stress over an extended period of time
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
6
Q
when is welding not recommend? what temp?
A
under 0F
7
Q
recommend to warm the base metal to 60F?
A
when 0-32F
8
Q
Std temp range for PT?
A
40 to 125F
9
Q
temp where scaling potential increases due to CW corrosion?
A
> 140F
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)
11
Q
temp where SCC becomes a concern?
A
> 140F
12
Q
Temp where special procedure are needed for UT?
A
150F (Api510 5.7.2.3)
13
Q
What temp does sulfidation begin?
A
> 450F
14
Q
Internal inspection interval?
A
less of 1/2 RL
OR
10 years
15
Q
external inspection interval
A
less of 5 years
Or
internal interval
16
Q
when internal life is less than 4 years the INTERNAL inspection interval can be
A
full remaining life up to 2 years
17
Q
thickness inspection interval
A
less of 1/2 RL
OR
10 years
18
Q
CUI inspection for (4) (type of service/CS/SS/Duplex)
A
- intermittent service
- 10-350F CS
- 140-350F for SS
- 280-350 for dudplex
19
Q
deferrals inspections up to (2)
A
LESS
- 6 months
- 10% of the inspection/servicing interval
20
Q
deferrals of inspection repairs
A
- 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)
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.
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
23
Q
When should a CS be consulted when developing a inspection plan?
A
designate potential damage mechanisms
24
Q
what material has the highest corrosion rate due to suffixation
A
CS
25
max temp to take UT thickness
1000F
26
pwht temp for CS?
1100F (UCS-56)
27
max temp for performing MT?
up to manufacture limitation
28
Design pressure for vessel asME VIII?
15PSI to 3000PSI (U1 h2)
29
Design pressure of non fired boilers that requires full RT?
>50 psi (UW-2 c2)
30
min/preferred/max range for a pressure gauge during a Pressure test?
1.5x TP / 2.0 X TP / 4x TP
31
Superimposed back pressure is pressure coming from other sources when
PSV in close position. It may be constant or variable depends on the sources.
32
Built up back pressure is pressure generated as a result of fluid flowing through
PSV in open mode.
33
widely scatted pits can be ignored if all of the following are true (3)
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
(L*W) + (L*W) of all the pits
3. sum of the length of pits within any 8" line DOES NOT exceed 2"
34
What should not be consider as an alteration?
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.
35
API 510 is restricted to what kind of equipment?
1. PV
2. PRD
placed in services
36
API 510 is developed for what industries/
refining and chemical
37
if conflict between ASME and API which should govern?
API 510
38
PH1 vs PH14
strong acidic/ strong alkanity
39
CUI inspection can be performed with UT from ____of the vessel
ID
40
examine of flanged joints for (4)
1. leakage
2. stains
3. deposit
4. drips
41
examine of flanged faces for (2)
1. distortion
| 2. gasket seating services
42
examine of flanged fasteners for (2)
1. corrosion
| 2. thread engagement
43
weld joint category A
1. longitudinal welds in shell/nozzles
| 2. all welds in heads, hemi heads to shell weld joint
44
weld joint category B
1. all circumferential welds in shell/nozzles
| 2. head to shell joint (if ellipsodial)
45
weld joint category c
flange welds
46
weld joint category d
nozzles attachment welds
47
weld joint types 1/2/3/4/5/6
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
48
category A > B because
A joint are under double stresses
49
RT 1
RT 2
RT 3
RT 4
```
1/2 = full
3= spot
4 = combo of RT1/2/3
```
50
seamless parts for spot/no rt?
type 1 / 2 = 1.0 / 0.85
| Type 3-6 = 0.85/0.85
51
max length of a crack, IP or incomplete fusion that is allowed in welds for a NEW vessel?
zero
52
max mill tolerance for flat plate?
smaller of
0.010"
OR
6% wall thickness
53
max discontinuities in a bend?
1/8"
54
min radius of a insert patch
1"
55
at what thickness is CS required PWHT?
>1 1/2" (table UCS-56)
56
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
4 in. (100 mm) or four times the depth of the
| repair weld, whichever is greater on each side of the joint.
57
min length of spot radiograph?
6"
58
what vessel size is excluded from ASME VIII?
less than 6" ID
59
depth to dig at soil to air interfaces? Where is the most serve corrosion located?
Good judgment /
the most severe corrosion will usually be found between ground level and up to several inches below.
60
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.
owner/user
61
For a corroded area of considerable size the wall thicknesses may be averaged over a length NOT EXCEEDING the following: (2)
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
The following criteria must be met in order to use thickness averaging: (6)
— 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
hydrogen blister occurs?
below/above liquid level
64
hydrogen blister occurs?
below/above liquid level
65
cUI most susceptible areas include: (7)
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
ellipsoidal heads E = ?
E=1 unless otherwise say it is welded
67
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 _________
3 ft (1 m)
68
heating the vessel in more than one heat in a furnace, provided the overlap of the heated sections of the vessel is at least ______
5 ft (1.5 m)
69
One spot shall be examined on each vessel for
| each________ increment of weld
50 ft (15 m)
70
Min time to wait for checking for delayed cracking after welding SS cladding ?
And for what material?
24 hours by UT
| P3 P4 and P5
71
The _________ shall use welders and welding procedures that are qualified in accordance with ASME Code, Section IX
repair organization
72
Corrective procedures should be utilized when metal temperatures (typically above _____impact
the accuracy of the UT thickness measurements obtained.
150 °F [65 °C])
73
what % of Nickle makes it an alloy a Nickle base alloy?
>30%
74
Before any repairs or alterations are performed, all proposed methods of design, execution, materials,
welding procedures, NDE, and testing shall be approved by the ___________
inspector and engineer.
75
The welding shall be limited to the (3)
SMAW, GMAW, and GTAW processes
76
corrosive service, the wall thickness
t = tactual– 2(Crate X Iinternal )
77
3 factors that can effect the resistance of crushing due to external pressure?
1. thickness
2. Diameter
3. stiffeners
78
impact tempest lowest temp if stress ratio is NOT LESS THAN 0.35
-55F
79
_______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).
Inspectors
80
how many specimen needed for charpy impact test?
3
81
charpy test impact
ONLY 1 of 3 allowed to be less than min required (no less than 2/3)
82
throat size
= 0.707 * leg size
83
leg size =
throat / 0.707
84
leg size =
throat / 0.707
85
fillet leg size nears to round to the nearest
16th of an inch
86
external interval
LESSOR of 5 years or internal interval
87
2 main requirement to perform an onstream in lieu of an internal inspection?
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
all longitudinal weld are what category?
A
89
all circumferential weld are what cateogory?
B`
90
code for confined space?
API2217A
91
code for confined space?
API2217A
92
MAWP is a ___ of the vessel?
top
93
stamp used for RV
UV
94
stamp for lethal service
L
95
max set pressure for a single PRD for a vessel?
MAWP
96
purpose of controlled deposition welding?
refinement of the grain structure
97
preferred inspection for SCC?
PT or ECT
98
A pressure test is normally required (2)
after an alteration or major repair.
applied if the inspector believes that one is necessary and specifies it in the repair plan
99
For a large vessel with two or more zones of differing corrosion rates,
each zone may be treated independently when
| determining the inspection intervals or for substituting the internal inspection with an on-stream inspection.
100
who is responsible to maintain qualified welding procedure use for repairs/alteration
repair organization
101
who is responsible to maintain qualified welding procedure use for repairs/alteration
repair organization
102
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) The application is reviewed, and a procedure is developed by an engineer experienced in the appropriate
engineering specialties.
103
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) The application is reviewed, and a procedure is developed by an engineer experienced in the appropriate engineering specialties.
104
common metal with an endurance limit?
CS / Low alloy / TI
105
common metal W/O endurance limit
300 /400 / aluminum
106
-P # allowed to use preheat in lieu of PWHT
P 1
| P3
107
P # allowed in CDW in lieu of PWHT?
P1
P3
P4
108
P# should be examine for delayed cracking after repairs to SS cladding?
P3
P4
P5
109
circumferential weld joint category? (except)
B except shell to head for hemi
110
two main gamma ray siotopes for RT?
Iridium 192 / Cobalt 60
111
how should relief valve be trasnported
upright
112
max taper required for a pressure vessel with mismatch?
3 to 1 (UW-9c)
113
what qualifies a weld in all position
6G
114
charpy impact test for?
toughness
115
what must be in the bent potion of a guided bend specimen?
weld and HAZ
116
2 activities must be done before an inspection can defer?
perform a satisfactory review of the equipment history and appropriate risk analysis
117
the RBI assessment shall be reviewed and approved by the_______ at intervals
engineer and inspector
118
large vessel with 2 or more zones?
each zone may be treated independently
119
PRD repair organization must have ?
QC program
120
hydro test pressure is
1.3 X MAWP x LSR
| LSR = Stress at Test Temp/ Stress at Design pressure
121
On the new welds, the
| welder should stamp the weld with their ID mark every
3 feet
122
burn through
excessive visible root reinforcement in a joint welded from one side or a hole through the root bead.
123
pneumatic test pressure
1.1XMAWPxLSR
124
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
50%
| 10%
125
metal temperature during pneumatic test should be ____above MDMT
atleast 30F
126
hydro test pressure be at the ____ of the vessel
top
127
hydrostatic INSPECTION presssure
is hydro test pressure / 1.3
128
the repair for stainless Steel Weld Overlay and Cladding shall be inspected by the
PT method
129
Crack-like flaws and environmental cracking shall be assessed by an
engineer and/or corrosion specialist
130
Preferential weld corrosion shall be assessed by
the inspector
131
Pressure-relieving devices shall be tested and repaired by a (2)
1. repair organization qualified and
2. experienced in relief valve maintenance
3. QC
132
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
pressure test
133
after repairs who shall verify?
inspectors
134
Temporary repairs may be conducted on pressure vessels as long as the
inspector and engineer
135
UT The maximum speed of scanning should be
stated in the procedure.
136
Calculations performed by either the _______ for rerate
manufacturer or an owner/user engineer
137
________ can be substituted for internal inspections only when the vessel is too small to safely enter or all
internal surfaces c
Manway or inspection port inspections
138
leak test should be perform
if the inspector think it is necessary.
139
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
with an engineer
140
welders cannot qualify under what OD?
2 7/8 , needs to be higher than 2 7/8
141
type of repair can be made with a pipe cap?
permanent repair of a localized corroded area
142
pneumatic INSPECTION pressure
pnematic test pressure / 1.1
(step 7)`
143
MT equipment should not vary by more than?
+/- 10%
