Technical Data; Operating Conditions; Disposing Of The Product - Grundfos KP Notice D'installation Et De Fonctionnement

10. Technical data

10.1 Operating conditions

10.1.1 Flow rate
Minimum flow rate
The pump must not run against closed outlet valve as this will
cause an increase in temperature or formation of steam in the
pump.
This may cause shaft damage, impeller erosion, short life of the
bearings, damage to the stuffing boxes or the mechanical shaft
seals due to stress or vibration.
The minimum continuous flow rate is shown when selecting the
pump in Grundfos Express online selection tool.
Maximum flow rate
The maximum flow rate must not exceed the value stated on the
nameplate. If the maximum flow rate is exceeded, cavitation and
overload may occur.
10.1.2 Ambient temperature and altitude
The ambient temperature and the installation altitude are
important factors for the motor life, as they affect the life of the
bearings and the insulation system.
Too high ambient temperature or low density and consequently
low cooling effect of the air may result in overheating.
In such cases, it may be necessary to use a motor with a higher
output.
10.1.3 Liquid temperature
The maximum liquid temperature depends on the material of the
mechanical shaft seal, o-rings, gaskets and plain bearings used:
• Temperature range for BUNA:
32-210 °F (0-99 °C).
• Temperature range for FKM:
59-275 °F (15-135 °C).
• Temperature range for EPDM:
59-275 °F (15-135 °C).
• Temperature range for vesconite:
10-120 °F (-12 - +50 °C).
• Temperature range for graphalloy:
10-275 °F (-12 - +135 °C).
10.1.4 Pressures in the pump
Pressure p stated on pump
(pressure above atmospheric pressure)
Pump pressure
Inlet pressure
Fig. 16 Pressures in the KP pump
10.1.5 Outlet pressure
Maximum outlet pressure
The maximum outlet pressure is the pressure (TDH) stated on the
pump nameplate.
10.1.6 Inlet pressure
Minimum inlet pressure
The minimum inlet pressure must correspond to the NPSH curve
for the pump + a safety margin of minimum 1.6 ft (0.5 m) head.
Pay attention to the minimum inlet pressure to avoid cavitation.
The risk of cavitation is higher in the following situations:
• The liquid temperature is high.
• The flow rate is considerably higher than the pump's rated flow
rate.
• The pump is operating in an open system with suction lift.
• The inlet conditions are poor.
• The operating pressure is low.
Maximum inlet pressure
The inlet pressure + the pump pressure must be lower than the
maximum pressure (TDH) of the pump.

11. Disposing of the product

This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
Subject to alterations.
29