Ariston 200D Instructions For Installation, Use, Maintenance - Page 15

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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