Grundfos Inline single stage pump TP 50-290/2 A-F-A-BAQE-JW1

1: Pump housing
2: Impeller
3: Stub shaft
4: Pump head/motor stool
5: Wear rings
The pump housing is provided with a replaceable brass neck ring to reduce the amount of liquid running from the
outlet side of the impeller to the inlet side.
The impeller is secured to the shaft with a nut.
The pump is fitted with an unbalanced rubber bellows seal with torque transmission across the spring and around the
bellows. Due to the bellows, the seal does not wear the shaft, and the axial movement is not prevented by deposits
on the shaft.
Seal faces:
• Rotating seal ring material: carbon graphite, metal-impregnated
• Stationary seat material: silicon carbide (SiC)
Due to the favourable lubricating properties of carbon graphite, the seal is suitable for use even under poor lubricating
conditions, such as hot water.
However, under such conditions, wear on the carbon graphite face can be expected, and seal life will be reduced .
The material pairing is not recommended for liquids containing particles as this will result in wear on the SiC face.
Secondary seal material: EPDM (ethylene-propylene rubber)
EPDM has excellent resistance to hot water. EPDM is not suitable for mineral oils.
A circulation of liquid through the duct of the air vent screw ensures lubrication and cooling of the shaft seal.
The flanges have tappings for mounting of pressure gauges.
The motor stool forms connection between the pump housing and the motor, and is equipped with a manual air vent
screw for venting of the pump housing and the shaft seal chamber. The sealing between motor stool and pump
housing is an O-ring.
The central part of the motor stool is provided with guards for protection against the shaft and coupling. The pump
shaft is fastened directly on the motor shaft with key and set screws.
Motor
The motor is a totally enclosed, fan-cooled motor with principal dimensions to IEC and DIN standards. Electrical
tolerances comply with IEC 60034.

The motor is flange-mounted with free-hole flange (FF).
Motor-mounting designation in accordance with IEC 60034-7: IM B 5, IM V 1 (Code I) / IM 3001, IM 3011 (Code II).
The motor efficiency is classified as IE3 in accordance with IEC 60034-30-1.
The motor has thermistors (PTC sensors) in the windings in accordance with DIN 44081/DIN 44082. The protection
reacts to both slow- and quick-rising temperatures, e.g. constant overload and stalled conditions.
Thermal switches must be connected to an external control circuit in a way which ensures that the automatic reset
cannot cause accidents. The motors must be connected to a motor-protective circuit breaker according to local
regulations.
The motor can be connected to a variable speed drive for adjustment of pump performance to any duty point.
Grundfos CUE offers a range of variable speed drives. Please find more information in Grundfos Product Center.