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ページを印刷する10. Where a single common discharge pipe serves more than one
system, it should beat least one pipe size larger than the largest
individual discharge pipe (D2) to be connected.
11. The discharge pipe should not be connected to a soil discharge
stack unless it can be demonstrated that the soil discharge
stack is capable of safely withstanding temperatures of the wa-
ter discharged, in which case, it should: a. contain a mechanical
seal, not incorporating a water trap, which allows water into the
branch pipe without allowing foul air from the drain to be venti-
lated through the tundish; b. be a separate branch pipe with no
sanitary appliances connected to it; c. if plastic pipes are used
as branch pipes carrying discharge from a safety device, they
should be either polybutylene (PB) or crosslinked polyethylene
(PE-X) complying with national standards such as Class S of
BS7291-2:2006 or Class S of BS 7291-3:2006 respectively; and
d. be continuously marked with a warning that no sanitary appli-
ances should be connected to the pipe.
Notes:
-
Plastic pipes should be joined and assembled with fittings appro-
priate to the circumstance in which they are used as set out in
BS EN ISO 1043-1:2002 Plastics. Symbols and abbreviated terms.
Basic polymers and their special characteristics.
-
Where pipes cannot be connected to the stack it may be possi-
ble to route a dedicated pipe alongside or in close proximity to
the discharge stack
TYPICAL EXPANSION DISCHARGE ARRANGEMENT
Termination of discharge pipe
12. The discharge pipe (D2) from the tundish should terminate in a
safe place where there is no risk to persons in the vicinity of the
discharge.
13. Examples of acceptable discharge arrangements are: a. to a
trapped gully with the end of the pipe below a fixed grating and
above the water seal; b. downward discharges at low level; i.e.
up to 100mm above external surfaces such as carparks, hard
standings, grassed areas etc. are acceptable providing that a
wire cage or similar guard is positioned to prevent contact, whilst
maintaining visibility; and, c. discharges at high level: e.g. into a
metal hopper and metal downpipe with the end of the discharge
pipe clearly visible or onto a roof capable of withstanding high
temperature discharges of water and 3m from any plastic gutter-
ing system that would collect such discharges.
14. The discharge would consist of high temperature water and
steam. Asphalt, roofing felt and non-metallic rainwater goods
may be damaged by such discharges. In some buildings, e.g.
care homes, in-line blending valves would need to meet the ad-
ditional performance standards set out in NHS Estates Model
specification D 08.
Not to scale
15 / EN