API 653

This API 653 Recertification Quiz study guide for 2026/2027 provides verified questions and answers covering essential tank inspection, repair, and maintenance procedures in compliance with API standards. Topics include converting tanks to elevated temperature operations, shell-to-bottom joint fatigue evaluation, magnetic particle inspection of tank bottoms, RBI assessment and maximum inspection intervals, nozzle installation stress calculations, underside corrosion rates, and material specifica...

Definitions -Length of shell-to-bottom weld that if repaired is considered a major repair or alteration >0" --- ref. (653 : 3.18.g ) Linings -Typically anchor profile of steel surface required for the installation of a tank bottom lining 1.5 -4.0 mils --- ref. (652:7.5) Welds -Maximum undercut of a vertical weld & nozzle weld 1/64" --- ref. (650: B.5.2.b ) Welds -Maximum undercut of a horizontal weld 1/32" --- ref. (650: 8.5.2.b ) Welds -Maximum diameter of a surface porosity...

Linings - Typically anchor profile of steel surface required for the installation of a tank bottom lining 1.5-4.0 mils Welds - Maximum undercut of a vertical weld & nozzle weld 1/64" Welds - Maximum undercut of a horizontal weld 1/32" Welds - Maximum diameter of a surface porosity cluster 3/32" Weld Qualification - Max allowed discontinuity in a Bend Test 1/8" Nameplates - Minimum size of nameplate letters 5/32" Bottoms - Minimum external projection of bottom plate on ...

When the direction of rolling is not known for material to be re used in a reconstructed tank Two tension tests shall be taken at right angles to each other (653 7.3.1.2) API 650 is intended as a purchase specification for oil tanks that do not exceed 2.5 internal pressure When constructing a new tank to API 650, openings in the shell _____ shall be reinforced >NPS 2 How far back shall the horizontal seams be cut from the vertical welds in a door sheet installation that crosses vertical...

Reference Documents -Fitness for service API 579 Reference Documents -Risked Based Inspection API 580 Reference Documents -Low Pressure Storage Tanks API 620 Reference Documents -Cathodic Protection API 651 Reference Documents -Tank Bottom Linings API 652 Reference Documents -Welding on In-Service Equipment containing Flammables API 2201 Reference Documents -NDE Procedure Guidlines ASME Sect V Reference Documents -Acceptance Standards for RT's of welds ASME Sect 8, Div 1 Refer...

External Inspection Interval Lesser of 5 years or RCA/4xN (N being corrosion rate) RCA Remain Corrosion Allowance (current thickness - required thickness) Ultrasonic Inspection Interval lesser of 15 yrs or RCA/2N (if corrosion rate is not known then the max interval is 5 years) Internal Inspection Intervals Initial Internal Interval 10 years without Safeguards or 30 years with Safegaurds - Interval maximum of 20 years without Release Prevention Barrier or 30 years with RPB Table for Inte...

alteration Any work on a tank that changes its physical dimensions or configuration. as-built standard The standard (such as API standard or UL) used to costract the tank If this as-built standardis not known, the as-built standard - the standard that was in effect at the date of the installation of the component. If the date of the installation of the component is unknown (as-built standard) then the current applicable standard shall be considered to be the as-built standard. authorized...

Fitness for Service (FFS) Risked Based InspectionAPI 579 Risked Based Inspection API 580 Low Pressure Storage Tanks API 620 Cathodic Protection API 651 Tank Bottom Linings API 652 Welding on In-Service Equipment containing Flammables API 2201 NDE Procedure Guidelines ASME Sect V Acceptance Standards for RT, MT & PT's of Welds ASME Sect 8, Div 1 Alternative code to evaluate pits and LTA's ASME Sect 8, Div 2 Welder Qualification Code ASME Sect IX Weld Procedure Qualificat...

Who Determines to use RBI methodologies? Owner/Operator RBI Document - API Code? API 580 What are the two factors of Risk? Consequence of failure and Likelihood of Failure RBI Assessments must be thoroughly___________? Documented Who conducts an RBI Assessment? Team of Knowledgeable of RBI Principles RBI Assessments shall be repeated at least every ______ Years? 10 years Two Primary Factors of Consequence of Failure are? Product Type and Volume Minimum thickness of a NEW tank botto...

what is the minimum thickness for a tank floor plate with no means for leak detection or secondary containment if an RBI program is not in place 0.1 inch reference table 4.4 API 653 when a full hydrostatic test is required, it shall be held for 24-hours reference 12.3.1 API 653 how many radiographs shall be taken in a square 2 in x 24 in but welded insert play in a 1-inch thick shell 6 total one horizontal one vertical one in each corner : reference 12.2.1.6.2 API 653 what is the minimum n...