4 Installation
A suitable position for the discharge point is ideally below
a xed grating and above the water seal in a trapped gully.
Downward discharges at low level, i.e. up to 100 mm above
external surfaces such as car parks, hard standings, grassed
areas, etc. 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.
Do not t any valves or taps to the discharge pipework.
Ensure the pipework has at least 1:200 fall continuously from
the tundish to the discharge point.
The discharge pipe from the pressure relief valve of the boiler
may be tee'd into the discharge pipework from the Glow-worm
downstream of the tundish in the horizontal pipework.
4.5 High Level Termination
Providing that the point of termination is such that persons
in or around the building will not be endangered should
discharge take place, the method of termination shown in
diagram 4.2 is satisfactory.
Examples of points to consider when deciding whether a
location for the high level discharge is suitable are:
1. The possibility, taking into account wind effect, that
someone may be in the path of the water being discharged
and if so, whether the temperature of the discharge water will
have been sufciently reduced to not be dangerous. Thermal
conductivity of the structure’s surface, climatic conditions and
location and orientation of the discharge pipe may or may not
have an effect on reducing the temperature of the discharge
water.
2. The location of windows and similar openings.
3. The likelihood of a pram being left beneath the point of
discharge.
4. The ability of the structures surface to withstand near
boiling water.
5. The possibility of ice formation if water is discharged onto
pedestrian walkways.
a b c d e f g
SS 115 938 969 421 351 281 556 728
SS 150 1148 1179 454 384 314 589 903
SS 175 1308 1339 454 384 314 589 1038
SS 200 1468 1499 454 384 314 589 1118
SS 250 1758 1789 454 384 314 589 1408
SS 300 2078 2109 454 384 314 589 1648
12552
Diagram 4.3
10
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