vonRoll hydro HYTEC Montageanleitung Seite 20

Check-list for installation
and operation
1. Pressure test
After the connection of the fire-hydrant to the drinking-water mains,
a pressure test should be carried out before filling in. After the mains
pressure test has been carried out, a functional test should be made.
2. Open valves
The hydrant covers should be removed. Then, by slowly opening the
main valve, any residual matter resulting from installation work can be
washed out. Afterwards, the main valve should be closed and checked
for tightness. If any leakage is noted, it is recommended that rinsing be
repeated in order to remove any foreign material possibly still trapped.
3. Drainage
In order to check drainage, the main valve should now be closed. The
fire-hydrant should now automatically drain (perceptible vacuum at the
ventilation holes in the cover).
4. Fill in around the fire-hydrant
After checking-out the water mains connection, the filling-in around
the fire-hydrant can be begun. A gravel bed must be provided
up to and above the flange joint between the inlet bend and the
riser pipe. Depending on the composition of the ground (bushes
and trees nearby?), it is recommended that the fire-hydrants be
protected against root infiltration by, for example, embedding in
a concrete pipe. In order to provide the fire-hydrant with a secure
footing, excavated material should be compacted in layer by layer.
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