1.1 Compatibility Definition
Comm 10.230(7) requires that components of the UST system be compatible with the product stored in the USTs. The term "compatibility" means when two different substances contact each other they maintain their physical and chemical properties. When two or more substances (such as ethanol and the rubber of a gasket used in a pump) come into physical contact with one other, the physical or chemical properties of those substances are not changed or altered in any manner.
This compatibility is not just at initial contact. It means compatibile for the entire design life of the tank system under conditions likely to be encountered. Compatibility also means that components maintain structural integrity when exposed to heat or flame. Refer to National Fire Protection Association NFPA 30A - 3.3.10 and 5.2.7).
Components may be evaluated and approved on the basis of their ability to:
1. Resist electro-chemical corrosion
2. Resist degradation from chemical attack
3. Maintain structural integrity in the presence of excessive heat or fire
4. Resist mechanical failure due to “stress and strain” such as from:
Tension and compression