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4.2 Inspections
In general, ADH horizontal centrifugal pumps do not need a "routine" maintenance and most of all they don't
require frequent dismantling. However, periodical inspection is advisable to verify the state of wear of the
impeller, the shaft and the bearings and if the general conditions of the internal parts of the pump are good.
The time between the inspections is strongly dependent on the operating conditions of the pump: the
characteristics of the liquid, the temperature, the materials used and obviously the time of operation. If a
problem occurs or the pump needs a complete inspection see section "Problem solutions".
4.3 Product circuit connection
After having correctly positioned the pump, proceed with connecting the pump to the product circuit, as
follows:
WARNING: To connect the pump only use connections with cylindrical gas threads made by
materials compatible with the fluid to be pumped and with the pump construction materials. E.g.:
pump in PP = connections in PP
1. On the suction and delivery ports, install a manual ball valve (fullbore) with a diameter equal to the
connection to the pump (never smaller), to ensure the liquid is shut-off in case of leakage and/or future
maintenance.
2. Proceed with the installation of pipe couplings in order to fasten the flexible pipes on to both manual
valves.
WARNING: The connection pipes to the pump must be FLEXIBLE, RIGID SPIRAL REINFORCED pipes
never of a smaller diameter than the connection ports of the pump.
For viscous liquids, use pipes with an OVERSIZED DIAMETER, particularly in suction line/port.
3. Proceed to connect the product suction and delivery pipes to their respective joints. Check if the connection
tubes to the pump are clean inside and do not contain any working residue.
4. Proceed with fastening the pipes with appropriate metal rings.
WARNING: the pipes must be adequately supported. PIPES MUST BE STRONG ENOUGH TO NOT
DEFORM DURING SUCTION AND MUST NEVER WEIGHT THE PUMP DOWN OR VICEVERSA.
WARNING: Check that the treated liquid does not or could not contain suspended solids of a large
diameter or with a potentially damaging shape and that the suction and/or delivery ports are not
obstructed in order to avoid cavitation or electric motor strain or dry operation.
Connection with rigid pipes can cause strong vibrations.
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