Membership Information

The Steel Tank Institute has been the leader in developing storage tank technologies for decades. Our tank standards and specifications are cited in regulation throughout the United States and in demand by customers worldwide. View descriptions of our licensed technologies.

If you want the business advantages of STI’s proven tank technologies, join our STI Shop Fabricated Atmospheric Tank membership section.

Before proceeding, please view the requirements to become a Shop Fabricated Atmospheric Tank member.

The same benefits and value are yours, no matter what steel fabrication product you manufacture. Education, advocacy, marketing and more–all are provided to STI/SPFA members.

The member companies of the STI/SPFA Field Erected Tank Section build steel tanks that meet or exceed the requirements of AWWA, NSF, API and industry standards. Members of STI/SPFA produce elevated, reservoir and standpipe water storage tanks. They also produce storage tanks for the petrochemical industry and special storage systems.

Before proceeding, please view the fees and requirements to become a Field Erected Tank Section member. 

The same benefits and value are yours, no matter what steel fabrication product you manufacture. Education, advocacy, marketing and more–all are provided to STI/SPFA members.

STI/SPFA members build steel water pipe that meets or exceeds the requirements of ASCE, AWWA, SWPMTAC, and all industry standards for water transmission. The welded steel pipe built by Members is available in diameters up to 180 inches under either internal or external pressure.

Companies in the Steel Water Pipe Section who manufacture pipe can enroll in the SPFA Pipe Quality Certification Program. The SPFA Pipe Quality Certification is a requirement in most piping specifications in the United States water transmission industry. The program addresses quality assurance and control, lining and coating operations, and equipment and welding procedures specific to steel water piping. The certification process also evaluates a company’s management, organization, engineering and procurement practices.

Before proceeding, please view the fees and requirements to become a Pipe Section member. 

The same benefits and value are yours, no matter what steel fabrication product you manufacture. Education, advocacy, marketing and more–all are provided to STI/SPFA members.

STI/SPFA member companies in the Pressure Vessel Section build steel pressure vessels that meet or exceed the requirements of ASME and all industry standards. These vessels are used by the petrochemical, food, power generation and hazardous materials storage industries.

Member companies in this section may also build special fabricated products that do not fall under another Fabricator member category. 

Before proceeding, please view the fees and requirements to become a Pressure Vessel & Special Products Section member. 

Affiliate Membership in STI/SPFA shall be open to those applicants, wherever located, who establish to the satisfaction of the Board of Directors that they are engaged in the business of supplying components, materials, or services for fabrication of steel products. Any Company (either by itself, or by or through a division or wholly owned or controlled subsidiary) eligible for both Fabricator and Affiliate Membership shall be required to become a Fabricator Member of STI/SPFA.

Membership shall be held in the name of the parent, unless fabrication is conducted by or through a division or subsidiary having a name different than the parent; in which event membership shall be held in the name of such division or subsidiary.

Regulators, third-party agency representatives, engineers, architects, consultants, inspectors, and other individuals who play a relevant role to the steel fabrication industry are eligible for our Industry Associate membership.