API 653 โ Aboveground Storage Tank Inspection Code Gap Analysis
Systematically assess your aboveground storage tank in-service inspection programme against API Standard 653 covering shell inspection, floor inspection, roof inspection, foundation and settlement, annular plate, cathodic protection, RBI, fitness-for-service, repair and reconstruction, and inspector qualifications.
API 653 (5th Edition)In-Service Tank InspectionFloor Scanning & MFLFloating Roof InspectionAuto-Save Enabled
ISO Xpert is a leading API and ISO management system consultancy and training provider headquartered in London, UK. We support storage tank owners, operators, and inspection companies in developing and implementing compliant API 653 in-service inspection programmes โ from initial gap analysis and programme documentation through RBI study facilitation, floor scanning evaluation, settlement survey interpretation, cathodic protection system review, and inspector competency training.
Our consultants bring practical petroleum storage and refinery experience across the full range of tank damage mechanisms including external and internal corrosion, floor pitting and MIC, shell corrosion, floating roof seal degradation, pontoon corrosion, weld cracking, settlement-induced stress, and external coating breakdown.
Expert API 653 and aboveground storage tank inspection training on Udemy โ self-paced courses for tank inspectors, integrity specialists, and facility operators.
Our specialist team helps tank farm owners and operators develop and improve compliant API 653 programmes โ gap analysis, inspection procedures, RBI, floor scanning review, settlement monitoring, and inspector training. Contact us for a free consultation.
ISO Xpert Ltd is committed to protecting your privacy. This policy explains how we collect, use, and safeguard your information when you use our API 653 Gap Analysis Tool and visit iso-xpert.com.
1. Information We Collect
Assessment Data: Company name, facility details, tank type, sector, RBI and CP status, AIA name, number of tanks, scope, and gap analysis responses.
Contact Information: Name, email, phone, and company details when you contact us.
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ISO Xpert Ltd | 71-75 Shelton Street, Covent Garden, London WC2H 9JQ, UK | info@iso-xpert.com | +44 7853 109840
Terms of Use
Last Updated: April 2025 | ISO Xpert Ltd
These Terms govern your use of the ISO Xpert API 653 Gap Analysis Tool. By using this tool, you agree to these Terms.
1. Permitted Use
For legitimate internal tank inspection programme management: gap analyses against API 653, internal reports, and programme improvement.
2. Intellectual Property
All content is the intellectual property of ISO Xpert Ltd. API 653 is the property of the American Petroleum Institute (API). This tool provides interpretive guidance only. ISO Xpert Ltd is not affiliated with API.
3. Disclaimer
This tool is provided "as is". Results are indicative only and do not constitute a formal API 653 inspection audit or fitness-for-service evaluation. Seek qualified professional advice for all storage tank integrity decisions.
4. Governing Law
These Terms are governed by the laws of England and Wales.
5. Contact
ISO Xpert Ltd | 71-75 Shelton Street, London WC2H 9JQ | info@iso-xpert.com | +44 7853 109840
API 653 Aboveground Storage Tank Inspection Code Gap Analysis Tool
Free interactive API 653 gap analysis tool by ISO Xpert. Assess in-service aboveground storage tank inspection programme compliance covering shell inspection, tank floor inspection and MFL scanning, annular plate, fixed cone roof inspection, open-top floating roof inspection (OTFR), internal floating roof inspection (IFRT), foundation assessment, differential settlement monitoring, cathodic protection system inspection, risk-based inspection (RBI) per API 580/581, fitness-for-service (FFS) per API 579-1, repair and reconstruction, API 653 inspector and AIA qualifications, and tank records management per API Standard 653 5th Edition.
API 653 Aboveground Storage Tank Inspection โ Frequently Asked Questions
Authoritative answers about API 653 Aboveground Storage Tank Inspection, inspection intervals, qualifications, RBI, and ISO Xpert consulting.
What is API 653?
API 653 is the American Petroleum Institute's Standard for Tank Inspection, Repair, Alteration, and Reconstruction. It provides minimum requirements for maintaining the integrity of in-service aboveground storage tanks (ASTs) built to API Std 650 or other applicable standards, including inspection intervals, methods, acceptance criteria, repair procedures, and inspector qualifications.
What are the API 653 inspection intervals for ASTs?
Under API 653, the maximum external inspection interval is 5 years or the interval established by RBI. The maximum internal (out-of-service) inspection interval is 10 years or the interval based on corrosion rate (half the remaining corrosion life), whichever is less. For tanks with RBI, intervals may be extended with documented justification. Tank floor inspection is a key driver of the internal inspection interval.
What tank types does API 653 cover?
API 653 covers aboveground atmospheric storage tanks including: fixed cone roof tanks, fixed dome roof tanks, open-top floating roof tanks (OTFR), internal floating roof tanks (IFRT), and horizontal tanks. The inspection requirements vary by tank type, particularly for roof inspection where floating roof seals, pontoons, and legs have specific requirements.
What is the tank floor inspection requirement under API 653?
API 653 requires internal inspection of the tank floor to assess corrosion, pitting, settlement, and shell-to-floor weld condition. Floor scanning by MFL (magnetic flux leakage) or ultrasonic methods is required for all floors unless a documented alternative assessment is performed. Critical areas include annular plates, shell-to-bottom weld zone, and areas subject to product or water accumulation.
Can ISO Xpert help develop an API 653 tank inspection programme?
Yes. ISO Xpert provides API 653 tank inspection programme gap analysis, inspection procedure development, RBI implementation, tank floor assessment, settlement monitoring, cathodic protection system review, inspector qualification guidance, and training for storage tank inspection professionals. Contact us at info@iso-xpert.com or call +44 7853 109840.