4
d.3 Discharges at 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 visible).
d.4 Where a single pipe serves number of discharges, such as in a block 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.
NOTE: The discharge will consist of scalding water and steam. Asphalt, roofing felt and non-metallic
rainwater goods may be damaged by such discharges.
GUIDANCE NOTES
New Stainless imp_alt 2/15/05 12:15 PM Page 5
