API 653

Question 1

API 653 COVERS TANKS RELATED TO WHICH STANDARDS?

Answer 1

Covers carbon & alloy steel tank built to API 650 & 12C standard.

Question 2

These standard provide_____ requirements for mantaining the integrity of welded or riverted, non-refrigerated, atmospheric pressure, above ground storage tanks ______________.

Answer 2

Minimum, after they have been placed in service

Question 3

Which parts of tank API 653 does cover?

Answer 3

Foundation, bottom, shell, structure, roof, attached appurtenances and nozzles to the face of the first flange, first threaded joint or first welded end connection

Question 4

In case of conflict (for in-service tanks) between APIs 650, 12C and 653 which standard does govern?

Answer 4

Latest Code govern

Question 5

Who has the ultimate responsibility for complying with API 653 provisions?

Answer 5

The owner/operator

Question 6

Which one to follow if Statuary Regulations VS API 653?

Answer 6

Statuary Regulations, unless API 653 is more stringent

Question 7

For Safe working Practices which API Publications are suggested?

Answer 7

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.

Question 8

Which section covers definitions?

Answer 8

Section 3

Question 9

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.

Answer 9

Alteration

Question 10

What is atmospheric pressure?

Answer 10

It describes tanks designed to withstand an internal pressure up to but not exceeding 2.5 Ibs./ sq. in. gauge.

Question 11

What type of agencies describes the definition “authorized inspection agency”?

Answer 11

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

Question 12

Who is authorized inspector?

Answer 12

An employee of inspection agency and certified as an aboveground storage tank inspector

Question 13

Which appendix of API 653 describes the requirements for authorized Inspector?

Answer 13

Appendix D

Question 14

How does it call the area on a tank bottom where settlement begins?

Answer 14

Breakover point

Question 15

What does it mean “change in service”

Answer 15

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

Question 16

How to calculate “corrosion rate”?

Answer 16

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

Question 17

What is critical zone?

Answer 17

The portion of the bottom or annular plate within 3 inches of the inside edge of the shell, measured radially inward.

Question 18

A procedure for installing a nozzle iin the shell of tank which is in service

Answer 18

Hot tap

Question 19

Who is inspector?

Answer 19

A representative of an organization’s mechanical integrity dept. who is responsible for various quality control & assurance functions..

Question 20

Who is the one who the legal entity having both control and responsibility for the operation & maintenance?

Answer 20

Owner / operator

Question 21

How does it call any work necessary to reassemble a tank that has been dismantled and relocated to a new site?

Answer 21

Reconstruction

Question 22

How does it call any work necessary to maintain or restore a tank to a condition suitable for safe operation?

Answer 22

Repair

Question 23

What is external inspection?

Answer 23

A formal visual inspection , as supervised by inspector, to assess all aspects of tank as possible without tank shutdown.

Question 24

What is internal inspection?

Answer 24

Supervised by authorized inspector a formal inspection of all accessible internal tank surfaces.

Question 25

Which API RP stands for fitness for service assessment?

Answer 25

API RP 579

Question 26

Which section does cover jurisdiction, compliance & safe working practices?

Answer 26

Section 1_Introduction

Question 27

Section 4 covers_____

Answer 27

Suitability for service

Question 28

What section does cover evaluation for continued service, decisions relative to repairs, alterations, dismantling, relocation or reconstruction?

Answer 28

Section 4 (refer to 4.1.2)

Question 29

Which factor need to be considered when checking for suitability for service?

Answer 29

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.

Question 30

What to do when roof plates corroded to an average “t” of less than 0.09’’ (in any 100 sq. in)?

Answer 30

Repair or Replace.

Question 31

After determining the condition of roof support system for fixed roofs what need to be done if corrosion or damaged members?

Answer 31

Evaluate for repair or renewal.

Question 32

To which part require special attention as severe internal corrosion may not be evidenced by external visual inspection

Answer 32

Pipe columns

Question 33

For floating roofs if appeared cracks/ punctures which action need to be taken?

Answer 33

Repair or replace.

Question 34

For floating roofs if appeared pitting / corrosion what to do?

Answer 34

Evaluate for potential penetration before the next scheduled internal inspection.