Discharge pipe connections
This product falls within the scope of Building Regulation G3 which stipulates certain
conditions relating to the way any water discharge from relief valves is transported
away.
These conditions are designed to ensure that any discharge will not present a hazard to
people or to property, and that any discharge is clearly visible so that the underlying
cause is likely to be rectified promptly.
The essential requirement of G3 in relation to water discharge is that the discharge pipe
MUST terminate in a safe, visible position.
In achieving this aim the G3 regulations strongly recommended that:
•
The tundish is located within 500mm of the Pressure and Temperature Relief valve
and it is wherever possible oriented vertically. It must be visible to occupants and
positioned away from electrical devices.
•
The discharge pipe has a vertical fall of at least 300mm immediately below the
tundish.
•
The discharge pipe below the tundish is at least 22mm diameter (i.e. one size larger
than the Pressure and Temperature Relief valve outlet).
•
The discharge pipe should be as straight and as short as is possible and positioned
away from electrical components.
Diagram 3 illustrates an acceptable discharge pipe arrangement. The table below the
diagram specifies how the maximum acceptable pipe length from the tundish to the
final outlet depends on the pipe diameter and the number of bends.
For example, in 22mm copper with no bends the pipe could be up to 9m long. With two
bends present the maximum length drops to 9.0m - (2 x 0.80m) = 7.4m.
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