API 650 Closed Book Test

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What method is used to calculate the minimum shell thickness for a 260 foot tank?

API 650 1 foot method

API 653 shell formula

Variable design point method (correct)

ASME Section VIII, Div 2 method

What method is used to calculate the minimum shell thickness for a 160 foot storage tank?

API 650 1 foot method (correct)

API 653 shell formula

Variable design point method

ASME Section VIII, Div. 2

New roof plates should be at least ______ thick

3/16

New bottom plates should be at least _____ thick

1/4" (0.236) Signup and view all the answers

New bottom plates should extend _____ inches beyond the bottom to shell weld

2" Signup and view all the answers

Welders who weld tank pressure parts should be qualified to

ASME Section IX Signup and view all the answers

In tank bottoms, 3 plate laps should be at least _____ apart

12" Signup and view all the answers

RT film used to evaluate shell welds should have a diagnostic length of ______ inches

6 Signup and view all the answers

Welders should stamp their welds every _____ feet

3 Signup and view all the answers

When using a vacuum box, the standard pressure used during the exam should be a vacuum of ______ psig

3-5 Signup and view all the answers

All shell butt joints must have complete penetration and complete _______

Fusion Signup and view all the answers

Peaking is a potential problem with:

vertical shell welds Signup and view all the answers

Repads are tested using a ________ psig air test

15 Signup and view all the answers

What does annex M pertain to

Elevated temperatures Signup and view all the answers

What does Annex F pertain to

Higher internal pressure Signup and view all the answers

What height should the tank grade be above ground?

1' Signup and view all the answers

Single welded lap joints are permissible only on bottom and roof plates

True Signup and view all the answers

The 1st shell course vertical seam may be inline with the 2nd course shell seam

False Signup and view all the answers

As pressure (Liquid height) increases, this puts increasing strain on which welds?

Vertical Signup and view all the answers

Which, per code, should be completed first?

Shell to bottom joint Signup and view all the answers

What is the maximum permissible temperature when designed to annex M

500 Signup and view all the answers

What is the smallest lettering size allowed on the nameplate?

5/32" Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

What welds do not require welders identification?

roof plate welds and flanges to nozzle neck welds Signup and view all the answers