Ariston EP 15 UR 2 KW Manual - Page 9

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Fig.. 4

Suggest ways of terminating discharge pipes safely

Temperature & pressure

relief valve

be clear visibility at one or other of these locations. Examples of

acceptance are:

i) Ideally below a fixed grating and above the water seal in a trapped gully.

ii) Downward discharges at a low level; i.e. up to 100 mm above external

surfaces such as car parks, hard standings, grassed areas etc. These are

acceptable providing that where children may play or otherwise come into

contact with discharges, a wire cage or similar guard is positioned to

prevent contact, whilst maintaining visibility.

iii) Discharges at high level; i.e. into a 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

3 m from any plastic guttering systems that would collect such a discharge

(tundish visible).

iv) Where a single pipe serves a number of discharges, such as in blocks

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 large than the largest

individual discharge pipe to be connected. If unvented hot water storage

Metal discharge pipe (D1) from

temperature & pressure relief valve.

to tundish.

500 mm Max.

300 mm

Min.

Metal discharge pipe (D2) from tundish

with continuous fall. See Table 2 and worked

example.

systems are installed where discharges from safety devices may not be

apparent i.e. in dwellings occupied by the 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.

Tundish

Discharge below

fixed grating.

(see page 6 for

alternative points

of discharge).

Fixed grating

Trapped gulley