API & STI Inspections

DJA's services may be utilized as a total management concept or we will be happy to serve your needs on an item to item basis. Our Services include:
Sample external
Sample internal
Sti external

Tank Inspections

We perform tank inspections which meet or exceed the requirements established in API-653. Our inspectors are trained and certified in the latest technologies for testing above ground vessels to provide full service tank inspections to the storage tank industry.Services we provide include:
Services we provide include:
  • In-service API-653 tank inspection
  • Out-of-service API-653 tank inspection
  • Foundation settlement
  • Corrosion evaluations
  • Coating inspections including holiday testing
  • Floating roof seal gap inspections per EPA requirements
  • Helium testing for leaks in floors and floating roofs
  • Frangible roof evaluations
  • Allowable pressure analysis
  • Normal and emergency vent selection

External Inspections

• Complete inspection following API-653 In-Service inspection checklist • Thickness reading on shell plates • Thickness reading on roof plates • Visual inspection with photographs and/or a record of any visible defects • Thickness reading on all accessible nozzles • Shell layout drawings • Nozzle layout drawings • Layout of defects • Settlement survey • Post inspection meeting to discuss findings • Recommendations and/or observations • Summary of inspection findings • Final formal report

Internal Inspections

• Complete inspection following API-653 Out-of Service inspection checklist • Minimum of three thickness readings per each course per drop • Minimum of five thickness readings per each full roof plate • Minimum of five thickness readings per each full bottom plate • Vacuum box testing of all bottom lap welds and shell to bottom welds (corner welds) • Magnetic particle test nozzle welds and bottom-to-shell weld (or corner box) if tank is properly prepared • Visual inspection with photographs and/or record of any visible defects • Thickness reading for all accessible nozzles • Shell layout drawings • Roof layout drawings • Bottom layout drawings • Nozzle layout drawings • Bottom settlement survey • Post inspection meeting to discuss findings • Recommendations and/or observations • Summary of inspection findings • Final formal report

Magnetic Flux Leakage Evaluation

In an effort to provide our clients with the most accurate data possible about their tanks, DJA Inspection Services incorporates MFL (Magnetic Flux Leakage Evaluation) tank floor scanners. Our scanners use the principle of magnetic flux leakage to detect topside and underside pitting of steel tank bottoms. • Our equipment is portable and can fit through a manway.• Pitting as shallow as 20% of bottom thickness can be detected easily.• The MFL scanner can cover nearly 100% of the bottom (interference with weld seams and internal equipment).• The MFL scan can be performed with coatings and our add-on equipment can determine whether an indication is topside or soilside.• An 80' diameter tank can be scanned in approximately 8 - 10 hours. With this scan one can put a tank back in service with more confidence, knowing that a leak is not likely to develop before the next scheduled outage because of a pinhole in a pitted area. DJA does a full UT proof-up on all indications found by the MFL scanner.