Ariston Classico HE STI 500 Instructions pour l'installation, l'entretien et l'utilisation - Page 15

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Temperature & pressure

relief valve

. 3.11

2. Sizing of copper discharge pipe "D2" for common temperature valve outlet sizes.

ABle

Valve outlet size

G 1/2

G 3/4

G 1

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 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.

Metal discharge pipe (D1) from

temperature & pressure relief valve.

to tundish.

600mm Max.

300mm

Min.

Metal discharge pipe (D2) from tundish

with continuous fall. See Table 2 and worked

example.

Minimum size of

discharge pipe D1*

discharge pipe D2*

from tundish

15mm

22mm

28mm

Tundish

Maximum

resistance allowed,

expressed as a

length of pipe (i.e.

no elbow or bends)

22mm

Up to 9m

28mm

Up to 18m

35mm

Up to 27m

28mm

Up to 9m

35mm

Up to 18m

42mm

Up to 27m

35mm

Up to 9m

42mm

Up to 18m

54mm

Up to 27m

Discharge below

fixed grating.

(see page 10 for

alternative points

of discharge).

Fixed grating

Trapped gulley

Resistance created

by each elbow or

bend

0.8m

1.0m

1.4m

1.0m

1.4m

1.7m

1.4m

1.7m

2.3m