vonRoll hydro CLASSIC Montageanleitung Seite 20

Check-list for installation
and operation
1. Pressure test
After the connection of the fire­hydrant to the drinking­water 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 recommen­
ded 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 fire­hydrant should now automatically drain (perceptible vacu­
um at the ventilation holes in the cover).
4. Fill in around the fire-hydrant
After checking­out the water mains connection, the filling­in around
the fire­hydrant 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 fire­hydrants be protected
against root infiltration by, for example, embedding in a concrete
pipe. In order to provide the fire­hydrant with a secure footing, exca­
vated material should be compacted in layer by layer.