Buckeye Bladder Tanks store foam concentrate and are one component of a Balanced Pressure Foam System. They require no external power, other than a supply of water to ensure proper operation. The Vertical and Horizontal Bladder tanks are designed and constructed in accordance with the latest revisions to ASME code, Section VIII for unfired pressure vessels. They have a working pressure of 175 PSI and they are tested to one and one half times this pressure.