BOLTED STEEL TANK
Normally solid in certain standard sizes and dimensions, with a maximum capacity of about one million gallons.
Shell stress can range up to 21,600 PSI with A36 steel in the AWWA D103 design code.
It has a minimum roof plate thickness of .0700", a minimum shell plate thickness of .0940", and a minimum floor plate thickness of .0940".
Joints in the tank are lapped and bolted, with gasket material in between.
Expected lifetime of the tank is 30 - 40 years, and can be much less.
It may be more practical to replace the tank rather than repaint it or repair leaks.
Coating must be done at a distant factory. NSF lining must be specifically requested as an extra expense to comply with state laws.
Decorative features are usually not available. The numberous bolted joints discourage painting signs. Color may be limited to a standard color.
Bolted steel tanks were orignally designed as temporary tanks for oil field use, where appearance and durability were secondary, and minor leaks were not a problem. Water Storage requires tanks that are as permanant as the system, tanks with strength to spare, tanks that can be maintained instead of discarded. Welded steel tanks fulfill that need. Thousands of welded tanks in service for decades emphasize that they are the best buy for your water storage needs
BUILDING A BETTER TANK
Our primary capability is in field erected welded steel tanks. However TBI is more than capable to handle any of your other tank building needs from fixed roof tanks, open top flat bottom storage tanks, fixed roof flat bottom low pressure tanks, silos, hoppers, fire protection water storage tanks, potable, industrial water storage tanks, single pedestal elevated tanks, all the way to repair, relocation, and structural modification of welded steel tanks.
Field erected tanks constructed to AWWA specifications provide zero leakage tolerance. TBI can also provide foundations, painting, cathodic protection and yard piping. TBI also constructs to API specifications for storage of all types of petroleum and chemical compounds. Foundations, insulation, and special linings can be included.
Municipal, private, and industrial water systems depend on TBI steel tanks for long term value, reliable service, low predictable normal maintenance, no leaks, no spalling, no foundation undermining, and no water infiltration.
Vapor recovery and internal floating roof designs can be provided for all hydrocarbons, preventing air pollution, evaporation loss, and increasing safety.
WHAT KIND OF TANK SHOULD YOU BUY?
The two most likely candidates for a smaller size tank are a welded steel tank or a bolted steel tank. Compare the two below. We think you will see the clear supiority of a welded steel tank.
WELDED STEEL TANKS
Welded Steel tanks are available in virtually any size or with any dimensions, from 1,000 gallons to 34,000,000 gallons or larger.
Shell stress is a conservative 12,750 PSI in the AWWA D100 code basic design.
It has a minimum roof plate thickness of .1875", a minum shell plate thickness of .1875", and a minimum floor plate thickness of .2500".
All the joints in the tank are welded, fusing the entire tank into one solid piece, thus making it very sturdy and durable. The expected lifetime of the tank is 100 years or more with normal maintenance.
Welded steel tanks can easily be repainted and coating work can be done on-site for easy inspection. NSF approved lining is provided in accordance with state laws.
Decorative features are readily available, such as knuckles, pilasters, dome or umbrella roofs, and special colors or signs.