be clear visibility at one or other of these locations. Examples of
acceptance are:
i) Ideally below a fixed grating and above the water seal in a trapped gully.
ii) Downward discharges at a low level; i.e. up to 100 mm above external
surfaces such as car parks, hard standings, grassed areas etc. These are
acceptable providing that where children may 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 high level; i.e. 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
3 m from any plastic guttering systems that would collect such a discharge
(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 large 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 the blind, infirm or disabled people,
consideration should be given to the installation of an electronically
operated device to warn when discharge takes place. Note: The discharge
will consist of scalding water and steam. Asphalt, roofing felt and non-
metallic rainwater goods may be damaged by such discharges.
7
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