Grundfos TPD 50-60/2 A F A BQQE Flanged Pump Heating Circulator 415v Dn50 98957979 #4887 USED

Grundfos TPD 50-60/2 A-F-A-BQQE-DW1 – Flanged Twin-Head Heating Circulator Pump 415V DN50 (98957979) #4887 USED

This listing is for a Grundfos TPD 50-60/2 twin-head dry-rotor in-line circulator pump, product number 98957979. It has DN50 PN6/10 DIN flanged connections and is designed for heating, cooling and commercial building-services circulation duties where a robust twin-head pump arrangement is required.

Condition: supplied as a used pump. The unit has been previously installed/used and may show cosmetic wear consistent with service use. It is inspected prior to dispatch. Guarantee: supplied with a 6-month guarantee.

• Pump type: TPD twin-head dry-rotor in-line circulator
• Grundfos product number: 98957979
• Model: TPD 50-60/2 A-F-A-BQQE-DW1
• Connection: DN50 PN6/10 DIN flanges
• Port-to-port length: 280 mm
• Rated flow: 16.2 m³/h / 4.5 L/s
• Rated head: 4.39 m
• Electrical supply: 3 × 220–240D / 380–415Y V, 50 Hz
• Rated motor output: 0.37 kW per motor head
• Motor: 2-pole asynchronous IE3 motor
• Rated speed: 2850–2880 rpm
• Rated current: 1.74 / 1.00 A
• Liquid temperature range: -25 °C to +120 °C
• Maximum operating pressure: 10 bar
• Motor protection / insulation: IP55 / class F
• Shaft seal: BQQE mechanical seal
• Design: top-pull-out design for service without removing the pump housing from the pipework

Need help confirming suitability?
Call us on 01803 220416 for technical advice.

Manufacturer product page

Full technical specifications, curves and documentation can be viewed on the official Grundfos product page:
View Grundfos TPD 50-60/2 (98957979) – Variant curves

Technical documentation

Grundfos TP, TPD, TPE and TPED technical documentation can be viewed here:
View Grundfos TPE3, TPE2, TPE Series 2000/1000, TP and TPD data booklet

Typical applications

• Heating circulation systems
• Commercial building-services circulation
• Air-conditioning and chilled water systems
• District heating and district cooling
• Plant-room circulation duties
• Replacement of matching DN50 twin-head dry-rotor circulators

Frequently Asked Questions

What does the model number mean?

• TPD – twin-head version of the Grundfos TP dry-rotor in-line circulator range
• 50 – nominal diameter of inlet and outlet ports, DN50
• 60 – maximum head class, approximately 6 m
• /2 – 2-pole motor version
• A – basic pump version
• F – DIN flange connection
• A – basic materials version
• BQQE – shaft seal code
• DW1 – motor / voltage / speed suffix

What does the twin-head design do?

The TPD design has two parallel pump heads on a common in-line pump body. Twin-head pumps are commonly used where duty/standby operation, duty sharing or service resilience is required, depending on the system controls and installation setup.

What does BQQE mean?

BQQE describes the mechanical seal construction and materials:

• B – rubber bellows seal construction
• Q – silicon carbide rotating seal face
• Q – silicon carbide stationary seal face
• E – EPDM elastomers

BQQE is commonly used for heating and cooling water duties compatible with EPDM. The silicon carbide / silicon carbide seal faces offer good wear resistance and are useful for hot water applications.

What liquids can this pump be used with?

This pump is typically suitable for clean circulation liquids compatible with cast iron and EPDM, including heating water, chilled water, district heating/cooling water, condensate, softened water and clean industrial circulation liquids.

Water/glycol mixtures may be used, but allowable temperature and concentration depend on the full system design, seal selection and operating conditions. Refer to the Grundfos liquid compatibility guidance before use with glycol or brines.

Not suitable for:

• Liquids containing solid particles or fibres
• Flammable liquids
• Mineral oils or synthetic oils without suitable alternative seal selection
• Strong chemicals or solvents that attack EPDM
• Sea water or aggressive saline solutions
• Dirty water, wastewater or drainage duties

Is this suitable to replace other DN50 circulators?

This model uses DN50 PN6/10 DIN flanges with a 280 mm port-to-port length. Where dimensions and duty are comparable, it can replace other DN50 twin-head in-line circulators from brands such as Wilo, Lowara and KSB, subject to hydraulic duty, flange standard, electrical supply and control compatibility.

What is the difference between TPD and TPED?

TPD is the fixed-speed twin-head version of the TP dry-rotor in-line pump range. TPED is the electronically speed-controlled twin-head version with integrated variable-speed motor control. If replacing a TPED with a TPD, or vice versa, the electrical supply, control method and required pump duty must be checked carefully.

Can the motor be removed without disturbing the pipework?

Yes. The pump uses a top-pull-out design, meaning the power head can be removed for service while the pump housing remains installed in the pipework.

Is this a new pump?

No. This item is supplied as used. It has been inspected prior to dispatch and is supplied with a 6-month guarantee.

Who should install this pump?

Installation should be carried out by a competent heating engineer or electrician. The pump must be installed, wired and protected according to the motor nameplate, manufacturer instructions and applicable electrical regulations.

About Our Stock

Stock code: #4887
We specialise in supplying used and surplus pumps. This unit is inspected prior to dispatch and supplied with a 6-month guarantee.