overflow and warning pipe correct installation


The importance of correctly plumbing the water tank warning pipe and overflow correctly. This article is about overflow and warning pipe.

Warning pipes and overflows that we do not plumb correctly can lead to thousands of euro worth of water damage to buildings. Failure to plumb the warning pipe to a monitored area may lead to faults going undetected for long periods.

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How it works

The role of the warning pipe is to alert personnel of rising water levels in the water storage tank, indicating a fault or malfunction with the inlet or other connections.

If you do not detect it, water levels will continue to rise and exit the tank through the water tank overflow. It is vital that the overflow is correctly piped to a gully or bunded area to accommodate overflow water and avoid flooding, water damage, and possible costly repairs.

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WRAS warning pipe and overflow guidelines

‘Warning pipe’ means an overflow pipe with its inlet in the cistern at such a height that it will start to flow before the main overflow operates and with its outlet is in a position where the discharge of water can be readily seen.

Source WRAS 

Wherever possible warning pipes should discharge outside a building, however where this is not practicable owing to the design of the building, you may discharge them internally. View the WRAS regulation guide for examples of acceptable arrangements for the discharge of the warning/overflow pipe.

Source WRAS Regulations Guide

For more information please review our WRAS guidelines recommendations below. We offer water storage solutions for all applications contact our sales team or view our products page for more information.


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