Fabricated Steel Products > Shop Fabricated Tanks > Quality Control Program

Quality Control Program and Awards

Quality control is a crucial aspect of all manufacturing processes. Therefore, Member fabricators of the Steel Tank Institute's licensed tank technologies are subject to periodic, unannounced inspections by a team of STI/SPFA Quality Control Inspectors. These inspectors conduct a rigorous investigation of the manufacturing function at tank fabricator facilities, to ensure that companies are complying with the standards and specifications for manufacture of each licensed technology.


During the inspection, inspectors also verify that tank construction meets applicable Underwriters Laboratories (UL) and UL Canada (ULC) standards, incluidng UL 58, UL 1746, UL 142, UL 80, UL 2085, and equivalent ULC and international standards. For tanks listed under Southwest Research Institute (SwRI) standards, inspectors provide separate reports to SwRI.


In addition, each member fabricator making STI tanks is required to send at least one representative to our biennial Quality Control Meeting. The gathering is held at various locations, to include a tour of a willing member's facility. This allows member personnel to learn from one another. Also on the QC Meeting agenda are updates to standards and specifications and presentations by industry experts.


Today, over 100 STI shop-fabricated tank shops are inspected, with an average of five STI technologies licensed per shop. More than 450,000 tanks have been built to STI specifications. Because of the STI-SPFA Quality Control Program, our Members' customers are assured of the highest quality in manufacture of these Steel Tank Institute licensed tank technologies.


Every other year, Quality Award Recipients are chosen based on complete compliance ratings for our random QC inspections. A banner is presented to recipient companies who have achieved three years or more with no quality inspection non-compliance points, to remind employees of their high skill level and encourage continued excellence. Fabricators are required to produce a minimum number of fabricated units to qualify as a Quality Award recipient in these categories:


  • SILVER: Three consecutive years with no QC non-compliance tags

  • GOLD: Five consecutive years with no QC non-compliance tags

  • PLATINUM: Ten consecutive years with no QC non-compliance tags

  • DIAMOND: Fifteen or more consecutive years with no QC non-compliance tags


Because of the STI/SPFA Quality Control Program, our Members' customers are assured of the highest quality in the manufacture of these Steel Tank Institute licensed tank technologies:

Underground Storage Tanks

Aboveground Storage Tanks

sti-P3® Cathodically Protected Steel UST

F921® Double Wall Steel AST

ACT-100® Composite Steel UST

Flameshield™ Double Wall Steel Fire Tested AST

ACT-100U® Thick Urethane Composite Steel UST

Fireguard® Protected AST

Permatank® Steel and Fiberglass Double Wall Jacketed UST

Generator Base® Tanks


Quality Award