25 Questions
What method is used to calculate the minimum shell thickness for a 260 foot tank?
Variable design point method
What method is used to calculate the minimum shell thickness for a 160 foot storage tank?
API 650 1 foot method
New roof plates should be at least ______ thick
3/16
New bottom plates should be at least _____ thick
1/4" (0.236)
New bottom plates should extend _____ inches beyond the bottom to shell weld
2"
Welders who weld tank pressure parts should be qualified to
ASME Section IX
In tank bottoms, 3 plate laps should be at least _____ apart
12"
RT film used to evaluate shell welds should have a diagnostic length of ______ inches
6
Welders should stamp their welds every _____ feet
3
When using a vacuum box, the standard pressure used during the exam should be a vacuum of ______ psig
3-5
All shell butt joints must have complete penetration and complete _______
Fusion
Peaking is a potential problem with:
vertical shell welds
Repads are tested using a ________ psig air test
15
What does annex M pertain to
Elevated temperatures
What does Annex F pertain to
Higher internal pressure
What height should the tank grade be above ground?
1'
Single welded lap joints are permissible only on bottom and roof plates
True
The 1st shell course vertical seam may be inline with the 2nd course shell seam
False
As pressure (Liquid height) increases, this puts increasing strain on which welds?
Vertical
Which, per code, should be completed first?
Shell to bottom joint
What is the maximum permissible temperature when designed to annex M
500
What is the smallest lettering size allowed on the nameplate?
5/32"
A roof is considered frangible if the roof to shell joint will fail prior to the shell to bottom joint in the event of excessive internal pressure
True
External ultrasonic thickness measurements of the shell while the tank is in service can be a means of determining the rate of uniform corrosion. The extent of UT measurements shall be determined by the owner/ operator. What is the maximum interval of such thickness measurements when the corrosion rate is not known?
5 years
What welds do not require welders identification?
roof plate welds and flanges to nozzle neck welds
This quiz tests knowledge of methods used to calculate the minimum shell thickness for different sizes of storage tanks. It also covers the required thickness for roof and bottom plates, as well as the qualifications for welders working on tank pressure parts.
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