What is a double wall tank?
Double wall tanks (IMT) provide the best protection against hazardous chemical spills into the environment. The inner tank dome overlaps the outer tank sidewall to help prevent rainwater, snow, and debris from entering the containment basin.
How do double walled tanks work?
The outer, ‘double’ wall wraps around the inner tank, which creates space. This is where anything that leaks out of first tank goes. This means that the environment and your work space are safe. In addition, this outer wall usually has some sort of monitoring system, which can detect a leak.
Do double walled tanks need secondary containment?
Shop-built double-walled or double-hulled aboveground storage tanks (ASTs) may be used for secondary containment purposes, as long as they are operated with certain protective measures.
Are all UL 142 tanks double walled?
Tanks are built to Underwriters Laboratories specification standard UL-142. Vertical tanks may be of single or double wall construction. These tanks may also be built with or without multiple compartments for multiple fuel storage.
Why are tanks double walled?
Double wall tanks are ideal for storing corrosive, environmentally hazardous, chemical and other dangerous substances that could potentially endanger the health and safety of workers or damage the environment and threaten public health in the event of spillage.
When you have a double walled tank you may use what kind of monitoring?
Interstitial monitoring
Interstitial monitoring is a leak detection method that is used with double- walled tanks and piping. It is the only method of leak detection that can actually PREVENT a release to the environment, because the alarm should sound when the product is still contained within the outer wall of the tank or pipe.
Are diesel tanks double walled?
The Double Wall Diesel Fuel Storage Tank has a unique double wall clamshell design that meets SPCC regulations, eliminating the need for a secondary containment tank.
What is the difference between UL 142 and UL 2085?
(UL) UL-142 standard is a nationally recognized standard for construction of Steel Aboveground Tanks for Flammable and Combustible Liquids. UL-2085 tanks use the UL-142 standard as the basis for construction, but add additional materials to classify it as a protected tank.
What does interstitial monitoring mean?
Interstitial monitoring is a method of leak detection that can be used on double-walled tanks. They are designed to prevent releases into the environment by containing fuel in the “interstitial space” between the two tanks if a leak occurs from the inner tank.
What is interstitial sensor?
The Interstitial Sensor for steel tanks is non-discriminating and detects the presence of liquid between the double walls of the tank. The presence of liquid in the interstitial space of double-walled tanks triggers an alarm in your automatic tank gauge console. …
Which is the type I double wall tank?
This interstice is tested by applying a vacuum of 18″ Hg and holding it a minimum of 2 hours. The 2-hour fire-tested Flameshield® is also a Type I double wall tank. The fire-protected Fireguard® is a Type II UL 2085 double wall tank with a thermal lightweight insulation material in the interstice.
How big is a southern tank double wall tank?
Southern Tank manufactures a complete line of cylindrical (horizontal and vertical) and rectangular double wall tanks ranging in capacities up to 25,000 gallons (cylindrical). Rectangular tanks can be made to your size requirements within the boundaries of UL fabrication procedures.
What kind of tank has a beam support?
I beam supports are available to keep the vertical double wall tanks up off the ground to allow for visual inspection. The overwhelming majority of double wall tanks are the Type I variety. Type I double wall tanks are tight-wrapped meaning there is intimate contact of the inner and outer tanks.
How big is a 750 gallon Dia tank?
Horizontal Tanks Gallons # Dimensions 520 Gallon 50″ Dia x 61″ Horizontal 550 Gallon 48” dia. x 72” Horizontal 750 Gallon 48″ Dia x 96″ Horizontal 1000 Gallon 48″ Dia 11′ Horizontal