Section 7 - Frequency of Inspection Flashcards
Which of the following is not a leak test detection technology.
Acoustic Emmission leak detection
Capillary Soil leak detection. <
Inventory Control leak detection.
Soil-Vapor monitoring leak detection.
External CP should be
tested per API 651
For new tanks built to API 650, the minimum new thickness for the shell considers
considers both the shell stresses resulting from the product and the hydrotest water.
The product in a tank creates practically no stress where?
In the floor away from the shell
On a 120 foot diameter tank the pressure is highest where?
bottom of the shell
A large area on a shell course is corroded below acceptable limits. Which of the following is not an acceptable option?
Replace the corroded area
Lower the fill height
Change to a product with a lower specific gravity
Coat the corroded area with a lining–
An isolated deep pit in the shell does not appreciably weaken what?
the shell
Neither API 650 or API 653 have a method for determining the minimum required thickness of a tank’s:
Annular Plates
Floor Plates
Nozzles <
Shell Plates
Roof Supports are normally designer per
AISC’s Steel Construction MANUAL
The internal inspection interval in API 653 is controlled by the corrosion on the
Bottom
What is an acceptable way of obtaining a suggested corrosion rate for tank components?
Use corrosion rates from tanks in Similar Service
Who is responsible for deciding whether to use Similar Service as an acceptable way to obtain a suggested corrosion
Owner/User
Similar Service data is going to be used to analyze a tank bottom. Which of the following is true about the tank that is providing the Corrosion Rate Data?
One tank may provide soil-side corrosion rate data and another tank provides top side corrosion rate data.
Similar service corrosion rate data for soil-side corrosion:
Should be from the same site as the Candidate Tank
The top-side corrosion rate is normally .the result of:
The corrosion from “water bottoms”
