Our steel tanks are constructed of A36 carbon steel. A36 is used because of its high availability, strength, cost and ease of welding.
While we are mainly deal with the manufacturing of carbon steel tanks, we also have the expertise and resources to provide stainless steel tanks, such as API, STI-p3 and tanks which meet certain U.L. standards.
There are several specifications to follow when manufacturing a steel tank. The variables that play a major part in constructing a steel tank are:
- Size of tank
- Internal pressure
- External pressure
- Seismic forces
- Liquid stored
- Stresses encountered during operation
The codes that are followed are different for each size of tank and for different types of operation. For instance, Underwriter's Laboratories 142 is for steel, above ground tanks used for flammable and combustible liquids.
This code is for single and double-wall tanks. It states the minimum thickness for the shell(s), maximum pressure the tank withstands, minimum sizes of vents and manways, size of cradle, etc.
Underwriter's Laboratories 58 has generally the same principle as UL 142, but it is for underground tanks. UL 58 is usually associated with the Steel Tank Institutes standard STI-p3.
This code is the standard for fuel and oil tanks that are stored below grade/ underground. STI-p3 covers:
- Shell thickness
- Size and type of tie down straps
- Size of anchor bolts, etc.
If you have any questions regarding applying the proper specifications of manufacturing of our steel tanks Contact Us and a Arrowhead Storage and Containment Systems representative will assist