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d)
Have discharges visible at both the tundish and the final point of discharge but where this is not possible or is
practically difficult there should be clear visibility at one or other of these locations.
Examples of acceptable discharge arrangements are:
I.
Ideally below the fixed grating and above the water seal in a trapped gulley.
II.
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.
III.
Discharges at a high level; e.g. into a 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 visible).
IV.
Where a single pipe serves a number of discharges, such as in blocks of flats, the number served should 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 individual discharge pipe to be
connected. If unvented hot water storage systems are installed where discharges from safety devices may not
be apparent i.e. in dwellings occupied by blind, infirm or disabled people, consideration should be given to the
installation of an electronically operated device to warn when discharge takes place.
SAFETY DEVICE
(e.g. TEMPERATURE
RELIEF VALVE)
600mm MAXIMUM
300mm MINIMUM
DISCHARGE PIPE (D2) FROM
TUNDISH, WITH CONTINUOUS FALL
6.3.5
RELIEF VALVE DISCHARGE PIPEWORK
METAL DISCHARGE PIPE (D1) FROM
TEMPERATURE RELIEF VALVE
TO TUNDISH
TUNDISH
DISCHARGE IDEALLY BELOW
FIXED GRATING
FIXED GRATING
TRAPPED GULLY
12
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