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Examples Of Acceptable Dischargement Arrangements
Downward discharges at a low level; i.e. up to 100mm above external surfaces such as car parks,
hard standings, grassed areas etc. are acceptable providing that where children play or otherwise
come into contact with discharges, a wire cage or similar guard is positioned to prevent contact
whilst maintaining visibility.
Discharges at a high level; e.g. in to metal hopper and metal down pipe with the end of the
discharge pipe clearly visible (tundish visible or not) or onto a roof capable of withstanding high
temperature discharges of water and 3m from any plastic guttering systems that would collect such
discharges (tundish available).
be limited to not more than 6 systems so that any installation can be traced reasonably easily.
The single common discharge pipe should be at least one pipe size larger than the largest indi -
vidual discharge pipe to be connected. If unvented hot water storage systems are installed where
disabled people, consideration should be given to the installation of an electronically operated de -
vice to warn when discharge takes place.
Worked Example
4 No. elbows and length of 7m from the tundish to the point of discharge.
temperature relief valve is: 9.0m. Subtract the resistance for 4 No. 22mm elbows at 0.8m each =
of 7m, therefore calculate the next largest size.
G 1/2 G 3/4 G1
15mm 22mm 28mm
Min. size of discharge pipework
22mm 28mm 35mm 28mm 35mm 42mm 35mm 42mm 54mm
Max. length of straight pipe (no
bends or elbows)
9m 18m 27m 9m 18m 27m 9m 18m 27m
maximum length for each bend
or elbow in the discharge pipe
0.8m 1.0m 1.4m 1.0m 1.4m 1.7m 1.4m 1.7m 2.3m
Discharge Arrangement
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