Inlet And Outlet Of The Pump; Inlet Conditions (Suction); Outlet Conditions; Speed And Rotation Direction - UDOR ZETA 70 Bedien- Und Wartungshandbuch

6.2

INLET AND OUTLET OF THE PUMP

The Inlet of the liquid to be pumped, also called intake or supply, is generally of larger diameter than
the Outlet, also called delivery.
The Inlet and Outlet CANNOT be inverted.
6.3

INLET CONDITIONS (SUCTION)

Make sure the supply line is connected correctly and that it complies with the following requisites:
- Any point of the inlet pipeline cannot be smaller than the diameter of the Pump inlet.
- Be absolutely leak-proof to avoid any air infiltration.
- Not have 90° bends near the Pump inlet.
- Not have contractions or restrictions.
- Avoid any turbolence near the Pump inlet and in the supply tank.
- If an inlet filter is used, it must allow 200% more flow than the flow required by the Pump. It must
not cause any contraction or any pressure drop. The filter should be grant a filtration degree between
32 and 50 Mesh and should be cleaned on a regular basis to ensure its proper functionality.
- Maximum inlet pressure admitted: 0.5 bar (7 PSI).
- Maximum negative inlet pressure admitted:-0.2 bar (-3 PSI) [-6 inch.Hg].
- Maximum offset admitted between pump and supply source underneath: 2 m. (6.5 ft.).
6.4

OUTLET CONDITIONS

Make sure the delivery line and all the accessories are connected correctly, secured firmly,
hermetically sealed and that the pipes are sized appropriately. All pressurised pipes must be marked
durably with the maximum admitted pressure, which must never be less than the maximum working
pressure of the Pump, written on the Label.
6.5

SPEED AND ROTATION DIRECTION

The rotation speed of the shaft of the Pump must never exceed the RPM written on the Label
of the actual Pump.
The minimum RPM admitted is: maximum RPM x 0.6.
The rotation direction of the shaft of UDOR Pumps may be clockwise or anticlockwise
7.

CONTROLS ON SYSTEM

7.1

UNLOADER VALVE

A pressure regulator valve must be installed to avoid the pressure exceeding the maximum limit
indicated on the Label of the Pump.
Use of the Pump, even for a short period, with a pressure higher than such limit would damage
the Pump itself.
The regulator valve shall be compatible with the maximum pressure, flow rate and temperature
values written on the Label and in the "INLET CONDITIONS".
Incorrect installation of the pressure regulator valve could cause serious personal injuries and
damage to property as well as seriously damaging the actual Pump.
The circuit must be equipped with another safety valve to prevent the maximum pressure from
being exceeded in the case of anomalies in the pressure regulator valve.
7.2

NOZZLE

A deteriorated nozzle could cause a drop in pressure; in this case, do not adjust the pressure
regulator valve in the attempt to increase the pressure of the system because when the delivery line
closes, this would cause a boost in pressure, which could damage the Pump.
If the pressure drops, it is advisable to replace the nozzle and adjust the system's pressure again.
The flow rate of the Pump must be at least 10% higher than the flow rate that the utilities demand;
the excess flow rate must be discharged.
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