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Magflow^® TDG Multistage Boiler Feed Water Pump

Magflow^® Boiler Feed Water Pump Specification

Size	25-400 mm
Capacity	3.75-3600 m³/h
Head	50-2500 m
Particle Size	≤1.3mm
Tempreature	0-105℃ or customized
Power	5.5-4000 kW
Materials	Cast iron, Cast Steel, SS304, SS316L, Chrome Steel, Bronze, Duplex Stainless Steel, etc

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Magflow^® Boiler Feed Water Pump Product Description

Magflow^® TDG series Multistage Boiler Feed water Pump is a high-efficiency horizontal, single-suction, sectional multistage centrifugal pump designed specifically for heating and industrial water supply systems. It is primarily engineered for delivering clear water or non-corrosive liquids with physical and chemical properties similar to water at temperatures not exceeding 105°C. The pump is widely utilized in critical sectors such as power generation units, metallurgical heating, and district heating systems.

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Magflow^® Boiler Feed Water Pump Design Features

Magflow^® TDG series of pumps adopts a single-casing, single-suction, horizontally sectional construction, with the suction nozzle located above the front (suction) section and the discharge nozzle oriented vertically upward. The core components comprise the following three major modules:

Stationary Components

Main Body Clamping: The suction section, intermediate (stage) sections, guide vanes (diffusers), discharge section, bearing housing, and balance chamber cover are tightly joined together by through-bolts and nuts (tie rods), forming a rigid, unified assembly.
Base Mounting: Both the suction section and discharge section are securely bolted to the pump base (bedplate) on either side.

Rotor / Drive-Train Components

Locking and Anti-Rotation: The impellers, impeller spacer sleeves, balance drum sleeve, balance disc, and shaft sleeves are assembled onto the main shaft as a unit, secured at the shaft end with a round (slotted) locknut, and prevented from rotating relative to the shaft by keys (parallel keys).
Support and Coupling: The rotor assembly is supported at both ends by bearings and is directly driven by the motor via a flexible pin-and-bush (spider) coupling.
Thermal Compensation Design: A serrated (crown-tooth) shim is installed between the last-stage impeller and the balance drum sleeve to absorb thermal expansion stresses (Note: this shim must be replaced during every major overhaul of the pump).

Axial Thrust Balancing Mechanism

Fully Automatic Balancing: A hydraulic balance disc device—consisting of the balance seat (balance head), balance disc, balance sleeve, and balance drum sleeve—is employed to achieve continuous, automatic balancing of axial thrust during operation.

Magflow^® Boiler Feed Water Pump Quick Slection Chart

Magflow® Boiler Feed Water Pump Quick Slection Chart

Magflow^® Multistage Boiler Feed Water Pump Perfomance Parameters

Model	Capacity Q (m³/h)	Head H (m)	Speed n (rpm)	Power P (kW)	Eff. η (%)	NPSHr (m)
TDG6-25	3.75-7.5	73.5-306	2950	4-18.5	53	2-2.5
TDG6-50	3.75-7.5	144-624	2950	11-55	36	3-3.5
TDG6-80	3.75-7.5	220-982	2950	18.5-75	36	3-3.5
TDG12-25	7.5-15	69-338.4	2950	7.5-30	58	2-2.5
TDG12-50	7.5-15	93-648	2950	15-75	49	2-2.5
TDG12-80	7.5-15	220-982	2950	30-132	40	2-2.5
TDG25-30	15-30	82.5-340	2950	15-45	68	2.2-2.4
TDG25-50	15-28	144-618	2950	22-110	61	2.4-2.8
TDG25-80	15-30	380-1013	2950	75-160	56	3.1-3.8
TDG46-30	30-55	81-340	2950	22-75	75	2.4-4.6
TDG46-50	30-55	138-666	2950	37-160	71	2.5-3.2
TDG46-80	27-54	380-1056	2950	110-280	65	3.9-5.5
TDG85-45	55-100	117-510	2950	55-185	77	3.2-5.2
TDG85-67	55-100	183-740	2950	90-280	73	3.3-4.4
TDG85-80	51-102	304-880	2950	132-355	71	3.5-4.5
TDG85-100	51-102	285-1100	2950	132-450	65	3.8-4.6
TDG120-50	96-140	126.9-545	2950	90-250	78	3.2-6.7
TDG120-100	96-144	360-1260	2950	220-630	74	3.8-5.5
TDG150-30	119-190	85.5-330	2950	75-220	83	3.8-5
TDG150-50	120-180	85-550	2950	75-355	75	3.2-6.6
TDG150-80	90-180	228-880	2950	185-630	75	3.2-6.6
TDG150-100	120-180	285-1100	2950	200-710	73	3.8-5
TDG155-67	100-185	118-760	2950	90-450	79	3.2-6.6
TDG200-50	120-240	135-580	2950	132-400	81	4.5-5.8
TDG200-100	150-240	168-1130	2950	185-900	76	3.5-5
TDG200-150	150-240	378-1725	2950	400-1400	72	2.5-3
TDG210-70	160-260	186-712	2950	200-710	79.2	6.2-7.8
TDG280-100	196-336	368-1100	2980	500-1250	78.5	4-6.5
TDG155-30	119-190	54-320	1480	45-200	82	3.2-4.8
TDG155-50	120-180	127.5-550	1480	110-355	71	3.2-6.6
TDG200-50	132-240	198-544	1480	185-450	75	2.3-4.1
TDG280-43	185-335	76-470	1480	110-500	81	2.5-5.2
TDG280-65	185-355	186-680	1480	280-900	74	2.8-5.0
TDG280-95	180-335	244-979.7	1480	355-1120	72.5	2.5-3.7
TDG300-45	200-350	80-445	1480	110-450	85	2.5-5.2
TDG360-40	300-440	106.5-420	1480	185-630	84	4.65-5.4
TDG360-60	300-440	210-640	1480	400-1000	74.5	3.1-5.3
TDG360-95	280-410	244-979.4	1480	400-1400	73	2.6-3.8
TDG450-60	335-500	113-650	1480	250-1000	84	4.1-6.3
TDG450-95	385-515	244-979.7	1480	500-1800	75	2.8-4
TDG500-57	450-550	162-600	1480	355-1250	82	4.4-5.8
TDG550-50	450-590	90-540	1480	220-1000	84	5.2-6.5
TDG580-60	450-638	165-650	1480	450-1250	82.5	3.16-5.16
TDG640-80	530-760	201.6-904	1480	710-2240	78	7.2
TDG720-60	550-850	171-660	1480	560-1800	82	7
TDG1100-85	850-1350	221-862	1450	1250-4500	84	7

Magflow® Boiler Feed Water Pump Applications

Magflow^® Boiler Feed Water Pump Applications

Magflow^® TDG Boiler feed pumps (BFPs) are critical high-pressure pumps used to deliver water into boilers/steam generators against operating pressure. Key applications include:

Power Generation

Thermal (coal-fired) power plants – supplying feedwater to utility boilers, often the largest and highest-pressure BFP applications
Combined-cycle / HRSG plants – feeding heat recovery steam generators, frequently at multiple pressure levels (HP/IP/LP)
Nuclear power plants – feedwater supply to steam generators (secondary loop)
Biomass and waste-to-energy plants – feeding boilers fired by biomass, refuse-derived fuel, etc.
Cogeneration (CHP) plants – supplying industrial boilers producing both power and process steam

Industrial Process Steam

Chemical and petrochemical plants – process steam generation for reactors, distillation, heating
Refineries – steam for cracking units, stripping, and utility systems
Pulp and paper mills – recovery boilers and power boilers
Sugar mills and food processing – steam for evaporation, sterilization, and drying
Textile plants – steam for dyeing, finishing, and drying processes
Fertilizer plants – steam for ammonia/urea production processes

Magflow® Boiler Feed Pump on-site Applications