Bedienungsanleitung ACV Smart E 160 (Seite 17 von 36) (Englisch)

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3.55 Any discharge should be visible at the tundish. In addition, where discharges from

safety devices may not be apparent, e.g. in dwellings occupied by people with impai-

red vision or mobility, consideration should be given to the installation of a suitable

safety device to warn when discharge takes place, e.g. electronically operated.

Discharge pipe D2

3.56 The discharge pipe (D2) from the tundish should:

(a) have a vertical section of pipe at least 300mm long below the tundish before any

elbows or bends in the pipework; and

(b) be installed with a continuous fall thereafter of at least 1 in 200.

3.57 The discharge pipe (D2) should be made of:

(a) metal; or

(b) other material that has been demonstrated to be capable of safely withstanding

temperatures of the water discharged and is clearly and permanently marked to iden-

tify the product and performance standard (e.g. as specified in the relevant part of BS

7291)

3.58 The discharge pipe (D2) should be at least one pipe size larger than the nominal outlet

size of the safety device unless its total equivalent hydraulic resistance exceeds that

of a straight pipe 9m long, i.e. for discharge pipes between 9m and 18m the equivalent

resistance length should be at least two sizes larger than the nominal outlet size of the

safety device; between 18 and 27m at least 3 sizes larger, and so on; bends must be

taken into account in calculating the flow resistance. See figure, table and the worked

example.

3.59 Where a single common discharge pipe serves more than one system, it should be at

least one pipe size larger than the largest individual discharge pipe (D2) to be connec-

ted.

3.60 The discharge pipe should not be connected to a soil discharge stack unless it can

be demonstrated that that the soil discharge stack is capable of safely withstanding

temperatures of the water 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 ventilated through the

tundish;

(b) be a separate branch pipe with no sanitary appliances connected to it;

they should be either polybutalene (PB) to Class S of BS 7291-2:2006 or cross linked

polyethylene (PE-X) to Class S of BS 7291-3:2006; and (d) be continuously marked

with a warning that no sanitary appliances should be connected to the pipe.

Note:

1. Plastic pipes should be joined and assembled with fittings appropriate to the circums-

tances in which they are used as set out in BS EN ISO 1043-1.

2. Where pipes cannot be connected to the stack it may be possible to route a dedicated

pipe alongside or in close proximity to the discharge stack.

Termination of discharge pipe

3.61 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.

3.62 Examples of acceptable discharge arrangements are:

(b) to a trapped gully with the end of the pipe below a fixed grating and above the

water seal;

as car parks, hard standings, grassed areas etc. are acceptable providing that a wire

SLE - SLE Plus: A1007847 - 661Y2100 • D

Installation

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