API 653 Flashcards
API 653 COVERS TANKS RELATED TO WHICH STANDARDS?
Covers carbon & alloy steel tank built to API 650 & 12C standard.
These standard provide_____ requirements for mantaining the integrity of welded or riverted, non-refrigerated, atmospheric pressure, above ground storage tanks ______________.
Minimum, after they have been placed in service
Which parts of tank API 653 does cover?
Foundation, bottom, shell, structure, roof, attached appurtenances and nozzles to the face of the first flange, first threaded joint or first welded end connection
In case of conflict (for in-service tanks) between APIs 650, 12C and 653 which standard does govern?
Latest Code govern
Who has the ultimate responsibility for complying with API 653 provisions?
The owner/operator
Which one to follow if Statuary Regulations VS API 653?
Statuary Regulations, unless API 653 is more stringent
For Safe working Practices which API Publications are suggested?
API 2217A, 2015. 2016 (for potential hazards involved when conducting internal inspection, making repairs or dismantling tanks.
Note! Procedures must comply with state safety regulations involving “confined space” entry.
Which section covers definitions?
Section 3
How does it call any work on a tank involving cutting, burning, welding or heating operation that changes the physical dimensions and/or configuration of a tank. ( the addition of manways and nozzles greater than 12inch (NPS): increase or decrease in tank shell height.
Alteration
What is atmospheric pressure?
It describes tanks designed to withstand an internal pressure up to but not exceeding 2.5 Ibs./ sq. in. gauge.
What type of agencies describes the definition “authorized inspection agency”?
a) The inspection organization of the jurisdiction in which the aboveground storage tank is operated.
b) The inspection organization of an insurance company which is licensed or registered to and does write aboveground storage tank insurance.
c) An owner or operator of one or more aboveground storage tanks who maintains an inspection organization for activities relating only to its equipment, and not for intended for seal or resale.
d) Individual or independent organization under contract and direction of owner or operator
Who is authorized inspector?
An employee of inspection agency and certified as an aboveground storage tank inspector
Which appendix of API 653 describes the requirements for authorized Inspector?
Appendix D
How does it call the area on a tank bottom where settlement begins?
Breakover point
What does it mean “change in service”
A change from previous operating condition involving different properties of the stored product such as specific gravity or corrosivity and/ or different service conditions of temperature or/and pressure
How to calculate “corrosion rate”?
The total metal loss divided by the period of time over which the metal loss occurred.
CR= (Initial thk- current tck)/current time-date in service
What is critical zone?
The portion of the bottom or annular plate within 3 inches of the inside edge of the shell, measured radially inward.
A procedure for installing a nozzle iin the shell of tank which is in service
Hot tap
Who is inspector?
A representative of an organization’s mechanical integrity dept. who is responsible for various quality control & assurance functions..
Who is the one who the legal entity having both control and responsibility for the operation & maintenance?
Owner / operator
How does it call any work necessary to reassemble a tank that has been dismantled and relocated to a new site?
Reconstruction
How does it call any work necessary to maintain or restore a tank to a condition suitable for safe operation?
Repair
What is external inspection?
A formal visual inspection , as supervised by inspector, to assess all aspects of tank as possible without tank shutdown.
What is internal inspection?
Supervised by authorized inspector a formal inspection of all accessible internal tank surfaces.
Which API RP stands for fitness for service assessment?
API RP 579
Which section does cover jurisdiction, compliance & safe working practices?
Section 1_Introduction
Section 4 covers_____
Suitability for service
What section does cover evaluation for continued service, decisions relative to repairs, alterations, dismantling, relocation or reconstruction?
Section 4 (refer to 4.1.2)
Which factor need to be considered when checking for suitability for service?
a) internal corrosion due to the product stored or water bottoms;
b) external corrosion due to environmental exposure;
c) stress levels and allowable stress levels;
d) properties of the stored product such as specific gravity, temperature, and corrosivity;
e) metal design temperatures at the service location of the tank;
f) external roof live load, wind, and seismic loadings;
g) tank foundation, soil, and settlement conditions;
h) chemical analysis and mechanical properties of the materials of construction;
i) distortions of the existing tank;
j) operating conditions such as filling/emptying rates and frequency.
What to do when roof plates corroded to an average “t” of less than 0.09’’ (in any 100 sq. in)?
Repair or Replace.
After determining the condition of roof support system for fixed roofs what need to be done if corrosion or damaged members?
Evaluate for repair or renewal.
To which part require special attention as severe internal corrosion may not be evidenced by external visual inspection
Pipe columns
For floating roofs if appeared cracks/ punctures which action need to be taken?
Repair or replace.
For floating roofs if appeared pitting / corrosion what to do?
Evaluate for potential penetration before the next scheduled internal inspection.
