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
