Manual Elson Zircon (page 7 of 24) (English)

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DISCHARGE PIPEWORK

It is a requirement of Building Regulation G3 that

any discharge from an unvented system is conveyed

to where it is visible, but will not cause danger to

persons in or about the building. The tundish and

discharge pipes should be tted in accordance

with the requirements and guidance notes of

Building Regulation G3. The G3 Requirements and

Guidance section 3.50 - 3.63 are reproduced in the

following sections of this manual. For discharge

pipe arrangements not covered by G3 Guidance

advice should be sought from your local Building

Control Ofcer. Any discharge pipe connected

to the pressure relief devices (Expansion Valve

and Temperature/Pressure Relief Valve) must be

installed in a continuously downward direction and in

a frost free environment.

Water may drip from the discharge pipe of the

pressure relief device. This pipe must be left open to

the atmosphere. The pressure relief device is to be

operated regularly to remove lime deposits and to

verify that it is not blocked.

G3 REQUIREMENT

“...there shall be precautions...to ensure that the

hot water discharged from safety devices is safely

conveyed to where it is visible but will not cause

danger to persons in or about the building.”

The following extract is taken from the latest G3

Regulations

Discharge pipes from safety devices

Discharge pipe D1

3.50 Each of the temperature relief valves or

combined temperature and pressure relief valves

specied in 3.13 or 3.17 should discharge either

directly or by way of a manifold via a short length of

metal pipe (D1) to a tundish.

3.51 The diameter of discharge pipe (D1) should

be not less than the nominal outlet size of the

temperature relief valve.

3.52 Where a manifold is used it should be sized to

accept and discharge the total discharge form the

discharge pipes connected to it.

3.53 Where 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 tted as part of the hot

water storage system unit or package.

Tundish

3.54 The tundish should be vertical, located in the

same space as the unvented hot water storage

system and be tted as close as possible to, and

lower than, the valve, with no more than 600mm 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.

3.55 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 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

3.56 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 (see Fig. 5); 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 identify the product and performance

standard (e.g. as specied 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 ow resistance. See Fig 1, Table 3

and the worked example.

Note: An alternative approach for sizing discharge

pipes would be to follow Annex D, section D.2 of

BS 6700:2006 Specication for design, installation,

testing and maintenance of services supplying

water for domestic use within buildings and their

curtilages.

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 connected.

INSTALLATION DISCHARGE

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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