Bedienungsanleitung Ariston NUOS PLUS (Seite 31 von 44) (Englisch)

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6.13 TPRV & PRV DISCHARGE

6.14 TPRV AND PRV

DISCHARGE PIPES - TO GULLY

Discharge pipes from safety devices

Discharge pipe D1

3.49Each of the temperature relief valves or

combined temperature and pressure relief valves

specified should discharge either directly or by way of

a manifold via a short length of metal pipe (D1) to a

tundish.

3.50The diameter of discharge pipe (D1) should be not

less than the nominal outlet size of the temperature

relief valve.

3.51Where a manifold is used it should be sized to

accept and discharge the total discharge from the

discharge pipes connected to it.

3.52Where valves other than the temperature and

pressure relief valve from a single unvented hot water

system discharge by way of the same manifold that is

used by the safety devices, the manifold should be

factory fitted as part of the hot water storage system

unit or package.

Tundish

3.53The tundish should be vertical, located in the same

space as the unvented hot water storage system and

be fitted as close as possible to, and lower than, the

valve, with no more than 750mm of pipe between the

valve outlet and the tundish (see Diagram 1).

Note: To comply with the Water Supply (Water Fittings)

Regulations, the tundish should incorporate a suitable

air gap.

3.54Any 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

impaired 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

3.55The 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 (see Diagram 1); and

b. be installed with a continuous fall thereafter of at

least 1 in 200.

3.56The 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 identify the product and performance

standard (e.g.) as specified in the relevant part of

BS 7291).

3.57The 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

6.15 BUILDING REGULATIONS G3

The discharge from the cylinder TPRV and combination PRV must be

plumbed to the tundish and should not be used for any other purpose.

The tundish must be vertical and fitted within 750mm of the pressure relief

valve and must be located with the Nuos. The tundish must be in a position

visible to the occupants, and positioned away from any electrical devices.

The discharge pipe from the tundish should terminate in a safe place where

there is no risk to persons in the vicinity of the discharge, and be made of

a suitable material in line with Building Regulation G3 (preferably metal).

The tundish must not be located near or above electrical components,

switches or junction boxes.

The discharge pipes from safety devices (tundish) must be installed to

fully comply with Part G3 of the Building Regulations (latest edition).

The following text, and diagram 1 are reproduced from G3 Building

Regulations 2010 (as amended) Draft.

WARNING

Scalding water and steam can be blown out of the discharge

pipe. Position the discharge so that it is not a hazard to

property or people (especially children).

The following text in the shaded area is reproduced from the Building

Regulations. It is included here for reference only.

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