FINAL Day Flashcards
burn through (2)
- penetration a thin compartment w/ the welding arc
2. hole or depression in the root bead of a single groove weld due to excessive penetration
max lap patch thickness?
1/2”
another name for planar tilt
rigid tilt
Repair methods in pontoon? (2)
- rewelding of joints
2. use of patch plates
Roof repairs are acceptable
as long as it will resolve the roof to a condition enabling it to perform
sulfate reducing bateria?
local anaerobic conditions exists
type of internal floating roof?
metallic pan
if grounding condition doubts what to do?
check the resistances
NDE for bottom joints (4)
- vacuum test
- light diesel oil
- pressure test
- MP/LP
when should measurements be taken to verify dimensional tolerances?
B4 hydro
Atm corrosion , CR accelerated up to what temp?
250F
prior to energizing what must be checked?
structure to soil
Define repair per AI653
situatable for safe condition
max projection per API653 for sheet to bottom outside toe?
3/8”
what to do with cracks if found in shell to bottom?
REMOVED
what is a discontinuity?
interruption of a typical structure of a material , lack of homogeneity in it mechanical, physical and metallurgical properties
caustic corrosion?
localized metal loss w/ presence of salt , NaOH, and KOH
false calls who responsible?
owner/operator
welder who pass the required test for groove welds shall be qualified for
most fillet welds
conflict between API653 and regulation what to do?
regulation shall govern UNLESS 653 is more struct that API governs
how often to inspect venting?
periodically
Repair plates (4) (min/max size / thickness)
- min = 4”
- max = 48 x 72”
- thickness cannot be greater than 1/2”
- min thickness is 3/16”
NDE on penetrations using insert plates with butt welds?
full RT
measurement of tank settlement performed by?
personnel experienced
Shell cracks NDE?
VI and LP/MP for added sensitivitiy
what is a backing?
material or device place against the back side of the joint adjacent to the joint root to support/shield molten weld material
frangible roof max size of fillet weld joining roof plate to the top angles
3/16”
max out of plan settlement during hydrotest may be calculated by formula or?
additional settlement points
What can affect venting capacity of flame arrestors?
solidification of vapors
no good backscatter
LIGHT image of B on DARK background
unknown RT schedule for efficiency for SS
0.7
when is welding permitted in critical zone?
when it is widely scatter pits
source of some CP interference?
- electrical railroads
- weld machines
- impressed current CP
- thermoelectric generators
when to repair the CP system ?
if inspection indicated that CP is no longer adequate
max critical repair plate thickness
1/4”
API2000
safe venting
2015
safe entry
2201
hot tap
safety procedures for conducting internal inspection complies?
state/federal pertaining to confined space
RT/UT exam/method accordance
ASME V
RT/UT examiner accordance
ANST
high termal expansion what controls?
- avoidance of excessive restraints
2. PWHT to relieve residual stress generated during welding
lap patch repair that crosses any butt weld of vertical/horizontal seam must have an overlap of
6”
weld on patch permitted in the critical zone to an adjacent existing patch?
Not allowed
internal lining and RPB are consideration for?
determining the need for and method of CP system
when external UT measure are used to determine the CR, the extend of such measure is determined by
owner/operator
prove up and scanning operator are what type of test?
qualification test?
welded on patch for tank bottoms (2)
- never be place over area of global dishing
2. less than 12” cannot be over lap bottom seam
RBI shall be reviewed/aprpoved
RBI team
temp/perm attachments NDE?
examined by MP
