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Piping Sump [1]

A liquid-tight compartment in the piping stream of an underground storage tank system. It is typically used in double wall piping [2] construction. It permits the collection of any product leaking from the primary piping to be electronically or visually monitored.

 
Source URL (modified on 10/21/2014): https://testing.pei.org/wiki/piping-sump

Links
[1] https://testing.pei.org/wiki/piping-sump
[2] https://testing.pei.org/node/1022