Manual Elson Zircon (page 9 of 24) (English)

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Table 3: Sizing of copper discharge pipe (D2) for common temperature relief valve outlet sizes

NOTE: The above table is based on copper tube. Plastic pipes may be of different bore and resistance. Sizes and

maximum lengths of plastic should be calculated using data prepared for the type of pipe being used.

VALVE OUTLET

SIZE

MINIMUM SIZE OF

DISCHARGE PIPE D1

MINIMUM SIZE OF

DISCHARGE PIPE D2

FROM TUNDISH

MAXIMUM RESISTANCE

ALLOWED, EXPRESSED

AS A LENGTH OF

STRAIGHT PIPE (I.E. NO

ELBOWS OR BENDS

RESISTANCE CREATED BY

EACH ELBOW OR BEND

G 1/2 15MM 22mm

28mm

35mm

UP TO 9M

UP TO 18M

UP TO 27M

0.8M

1.0M

1.4M

G 3/4 22MM 28mm

35mm

42mm

UP TO 9M

UP TO 18M

UP TO 27M

1.0M

1.4M

1.7M

G 1 28MM 35mm

42mm

54mm

UP TO 9M

UP TO 18M

UP TO 27M

1.4M

1.7M

2.3M

Fixed grating

Discharge below

fixed grating

(Building Regulation

G3 section 3.61 gives

alternative points

of discharge)

Trapped

gully

Discharge pipe (D2) from tundish,

with continuous fall. See Building

Regulation G3 section 3.56, Table 1

and worked example

300mm

minimum

600mm maximum

Metal discharge pipe (D1) from

Temperature relief valve to tundish

Tundish

Safety device

(e.g. Temperature

relief valve)

Fig. 5: Typical discharge pipe arrangement (extract from Building Regulation G3 Guidance section 3.50)

Hi. My cylinder is getting too hot. Boiler continues to run for hot water when programmer is off for heating and hot water. Diverter valve is working so what else could be causing this? Submitted on 14-1-2023 at 11:28
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Elson Zircon Manual

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