Underwriters Laboratories UL-1746 Part III jacketed construction provides 360 degree double wall protection. It consists of a steel inner shell built to UL-58 and a fiberglass outer shell in accordance with UL-1746. The jacket design is classified as Type II meaning the outer shell completely encompasses the inner vessel.

This double wall design offers some distinct advantages. The fiberglass jacket can extend up the separator manway and piping connections to the first flange providing added protection. Leaks can be detected earlier with this design due to the fact that the interstitial space is small and, therefore, less liquid volume is required to activate float type leak detection probes. This design is also the most economical.

The outer fiberglass shell is 100 mils (1/8") minimum thickness. Due to inherent resistance of fiberglass to soil environments, the separator comes with a 30 year warranty against external corrosion failure. No anodes, piping electrical isolations, or cathodic test stations are required with this system.

For a jacketed Type II double wall oil-water separator, add a "-DW-L" to the end of the separator model. (For example: OWS-1000-DW-L).