The interstitial space on double wall separators can be monitored for leaks through a 2" access opening. The standard leak detection system McTighe utilizes contains an internal float that is designed to detect any liquid accumulation in the interstitial space.

An alarm control panel, that typically includes an alarm horn, silencer and light, is a part of the leak detection system. If a leak occurs and liquid builds-up in the interstitial space, the internal float will rise and send an alarm signal to the panel. In the event of a leak alarm, the separator must be inspected and tank integrity must be verified.

If the separator is mounted in a remote area preventing electronic leak detection, the interstitial space can be checked periodically for liquid accumulation using a gauge stick or the float leak sensor can be installed and checked with an ohmmeter to see if the float is up or down (circuit is closed or open).

See the detail following this page of the most common leak detection device McTighe uses.