Codes & Standards

More than 135 years ago, the first steel pipe ever laid in America began supplying water to the population of San Francisco. This five-mile long conduit—unlined, uncoated and unwrapped—was the first of millions of miles of pipe and millions of tons of steel used to create the infrastructure of America’s water, chemical and petrochemical distribution and transmission infrastructure.

As a testament to steel's durability, this pipe is still in service today. With considerable and ongoing improvements in the quality of mill steel, fabrication technology, welding, linings, coatings, and cathodic protection, the combination of steel's strength, performance, and durability remains unparalleled.

Steel also makes sense as the material of choice for above-ground water storage tanks. Steel's unmatched historic performance is clearly demonstrated by membership in the Century Club, whose water storage tank members have each provided over 100 years of service to owners and local residents.
As with water storage tanks, steel fuel storage tanks (both above-ground and below-ground) have lower initial and life cycle costs than other materials, meet zero leakage tolerance standards, are safe in the face of extreme weather conditions or natural disasters (including earthquakes, tornadoes, mud slides and extreme temperature changes), and are recyclable. They also exceed current Environmental Protection Agency Standards.

AISI works with the Steel Tank Institute/Steel Plate Fabricators Association to conduct research and promote technology transfer in the fabricated steel pipe and tank marketplace.

Now Available! A free, online management tool—Total Cost of Ownership (TCO)—to quantify the Net Present Value of water storage tank ownership. Available from the Steel Tank Institute/Steel Plate Fabricators Association.

Steel Facts from STI/SPFA - "Steel: The First Choice for Large-Diameter Water Pipe" - Steel pipe provides consistent strength, flexibility, durability, long life and other lasting benefits. Find out more here. Check out the suite of Steel Facts from STI/SPFA. 

Design Aids

SP131, Standard for Inspection, Repair and Modification of Shop-Fabricated Underground Tanks for Storage of Flammable and Combustible Liquids
10/27/2014 - SP131 was developed by the Steel Tank Institute/Steel Plate Fabricators Association in response to requests from several state environmental agencies.

Total Cost of Ownership Tool is Now Web-Based
A new aid offered by STI/SPFA, the Total Cost of Ownership (TCO) tool meets industry demand to quantify the Net Present Value of storage tank ownership. TCO was developed to assist water system managers. The TCO online tool is free to users, who can input and store data related to a specific tank or tank project and study the default data presented in the program.

Steel Plate Engineering Data - Design of Plate Structures, Volumes I and II
The Steel Tank Institute/Steel Plate Fabricators Association (STI/SPFA) and SMDI published this update to the 1992 version. It collects into one source document the many facets of plate design applicable to many types of structures, including steel tanks for liquid storage. Steel Plate Engineering Data - Design of Plate Structures, Volumes I and II is available both in printed and digital formats on AISI's online store.

Welded Steel Pipe Design Manual - 2007 Edition
9/1/2007 - The manual provides design standards, technical data and references for the design of water transmission lines and distribution systems using welded steel pipe.

The Handbook of Steel Storage Tank Systems
The Handbook of Storage Tank Systems is a Marcel Dekker, Inc. publication edited by Wayne B. Geyer of the Steel Tank Institute/Steel Plate Fabricators Association. The handbook was written by more than 20 industry experts. It contains information on shop-fabricated tanks, underground storage tanks, and above-ground storage tanks for petroleum, chemical, hydrocarbons, and other flammable or combustible fluids. A wide range of topics are covered, including: Fire safety and building codes; Planning; Corrosion-resistant design; Structural design; Welding procedures; Environmental considerations. This handbook is an essential reference for those in the hazardous fluid storage industry. For more information, visit the Marcel Dekker, Inc. Product Catalogue, select Engineering, then select Chemical Engineer or the Steel Tank Institute. To order, call (800) 228-1160 and ask for publication ISBN: 0-8247-8589-4.


Steel Tank Institute/Steel Plate Fabricators Association


American Society of Civil Engineers 

American Water Works Association 

ASTM International 

National Association of Corrosion Engineers