D Series Horizontal Multistage Centrifuga Pump, Clean Water Type

Product Overview

The D Series Single-Suction Multistage Clean Water Centrifugal Pump is a horizontal segmented multistage pump designed for continuous water supply applications. By connecting multiple impellers in series, it delivers high head output and is suitable for industrial and municipal systems requiring stable operation, high reliability, and easy maintenance.

This pump is suitable for conveying clean water or other liquids with physical and chemical properties similar to water. By replacing wetted parts, adjusting the sealing structure, and adding a cooling system, it can also be adapted for hot water, light corrosive liquids, oils, or media containing fine particles.

Model Designation

Key Features

• Multistage sectional design with compact structure; head can be flexibly adjusted by changing the number of stages to suit various operating conditions.

• High-quality cast iron impellers and casings ensure strong structural integrity and long service life with stable operation.

• High assembly precision and optimized flow path design result in high efficiency and low energy consumption.

• All wetted and sealing components are replaceable, facilitating maintenance and inspection.

Engineering Summary

The D Series horizontal single-suction multistage pump features high efficiency, wide performance range, low noise, stable operation, long service life, and ease of installation and maintenance. It complies with JB/T 1051-93 “Multistage Clean Water Centrifugal Pumps – Types and Basic Parameters.”

The series is designed using Computer-Aided Engineering (CAE) and manufactured with mature processes and a complete quality control system to ensure performance consistency and product reliability.
It is widely used in water supply and drainage systems, high-rise building pressure boosting, landscape irrigation, firefighting systems, long-distance water transfer, heating circulation, domestic hot water supply, and auxiliary equipment systems. Especially suitable for small boiler feedwater applications.

Typical Applications

• Industrial and municipal water supply and drainage systems

• Pressure boosting systems in high-rise buildings

• Landscaping and agricultural irrigation

• Fire protection booster and stabilizing systems

• Long-distance water transport and heating systems

• Domestic hot water circulation and boiler feed systems

• Auxiliary systems in industrial equipment water networks

System & Operation

Components & Supply

• Horizontal inlet and vertical upward discharge nozzle layout, allowing convenient piping connection.

• Main casing components are cast iron with high strength and pressure resistance.

• Impellers are made of precision-cast iron with internal guide vanes for improved energy conversion.

• Shaft is made of high-quality carbon steel and assembled with sleeves, locking nuts, and coupling for direct motor connection.

Technical Specifications

Operating Conditions

• Suitable for clean water or liquids with physical and chemical properties similar to water; minimal suspended particles allowed.

• Maximum medium temperature up to 110°C; sealing system can be adapted based on fluid properties.

• Pump rotates clockwise when viewed from the drive end; operating pressure is stage-dependent and must stay within design limits.

• Recommended for use in closed systems to maintain stable suction and prevent cavitation.

Service Conditions

• Indoor installation is recommended; avoid exposure to high humidity or corrosive gases.

• Ambient temperature ≤ 40°C; relative humidity ≤ 95%.

• Installation base must be level and vibration-free; anti-vibration measures should be taken if required.

• For outdoor use, protective covers and sealing measures are necessary to prevent ingress of rainwater or debris.

Protection Functions

• Motor should be equipped with thermal overload and phase-failure protection.

• Check valves and pressure relief valves should be installed at the outlet to prevent backflow and water hammer.

• Critical systems should include monitoring and alarm functions for pressure, temperature, and flow rate.

• The pump must not run dry or start without liquid; use liquid level interlocks when necessary.

Selection Criteria

• Determine pump model and number of stages based on required head and flow to ensure efficient operation point.

• Select materials and sealing type according to fluid temperature, corrosiveness, and viscosity.

• Installation layout defines nozzle orientation, motor power, and overall pump dimensions.

• For continuous-duty systems, install standby pump(s) or alternate operation modes to enhance reliability.

• Consider maintenance cycles and parts standardization to reduce long-term operation and service costs.

Installation & Dimensions

Outline Drawing

Performance Data

1	Bearing Cover	2	Nut	3	Bearing	4	Water Baffle Sleeve	5	Bearing Bracket	6	Front Shaft Sleeve	7	Packing Gland	8	Packing Ring
9	Suction Section	10	Intermediate Sleeve	11	Seal Ring	12	Impeller	13	Middle Section	14	Diffuser Baffle	15	Diffuser Sleeve	16	Tightening Bolt
17	Discharge Diffuser	18	Balance Ring	19	Balance Ring	20	Balance Plate	21	Discharge Section	22	Tail Cover	23	Shaft	24	Rear Shaft Sleeve

Performance Parameters

Model	Stages	Flow (Q)		Head (m)	Speed (r/min)	Power (kW)		NPSHr (m)	Efficiency η (%)
		m³/h	L/s			Shaft Power	Motor Power
50D8×2	2	18	5	19	2950	1.5	2.2	2.3	62
50D8×3	3	18	5	28.5	2950	2.25	3	2.3	62
50D8×4	4	18	5	38	2950	3	4	2.3	62
50D8×5	5	18	5	47.5	2950	3.75	5.5	2.3	62
50D8×6	6	18	5	57	2950	4.5	5.5	2.3	62
50D8×7	7	18	5	66.5	2950	5.25	7.5	2.3	62
50D8×8	8	18	5	76	2950	6	7.5	2.3	62
50D8×9	9	18	5	85.5	2950	6.75	7.5	2.3	62
50D8×10	10	18	5	95	2950	7.5	11	2.3	62
50D8×11	11	18	5	104.5	2950	8.25	11	2.3	62
50D8×12	12	18	5	114	2950	9	11	2.3	62
Model	Stages	Flow (Q)		Head (m)	Speed (r/min)	Power (kW)		NPSHr (m)	Efficiency η (%)
		m³/h	L/s			Shaft Power	Motor Power
80D12×2	2	32.4	9	22.7	2950	2.68	3	2.8	75
80D12×3	3	32.4	9	34.05	2950	4.02	5.5	2.8	75
80D12×4	4	32.4	9	45.4	2950	5.36	7.5	2.8	75
80D12×5	5	32.4	9	56.75	2950	6.7	7.5	2.8	75
80D12×6	6	32.4	9	68.1	2950	8.04	11	2.8	75
80D12×7	7	32.4	9	79.45	2950	9.38	11	2.8	75
80D12×8	8	32.4	9	90.8	2950	10.72	15	2.8	75
80D12×9	9	32.4	9	102.15	2950	11.06	15	2.8	75
80D12×10	10	32.4	9	113.5	2950	13.4	15	2.8	75
80D12×11	11	32.4	9	124.85	2950	14.74	18.5	2.8	75
80D12×12	12	32.4	9	136.2	2950	16.08	18.5	2.8	75
Model	Stages	Flow (Q)		Head (m)	Speed (r/min)	Power (kW)		NPSHr (m)	Efficiency η (%)
		m³/h	L/s			Shaft Power	Motor Power
100D16×2	2	54	15	35.2	2950	7.2	11	3.3	71.5
100D16×3	3	54	15	52.8	2950	10.8	15	3.3	71.5
100D16×4	4	54	15	70.4	2950	14.4	18.5	3.3	71.5
100D16×5	5	54	15	88	2950	18	22	3.3	71.5
100D16×6	6	54	15	105.6	2950	21.6	30	3.3	71.5
100D16×7	7	54	15	123.2	2950	25.2	30	3.3	71.5
100D16×8	8	54	15	140.8	2950	28.8	37	3.3	71.5
100D16×9	9	54	15	158.4	2950	32.4	37	3.3	71.5
100D16×10	10	54	15	176	2950	36	45	3.3	71.5
100D16×11	11	54	15	198.6	2950	39.6	55	3.3	71.5
100D16×12	12	54	15	211.2	2950	43.2	55	3.3	71.5
Model	Stages	Flow (Q)		Head (m)	Speed (r/min)	Power (kW)		NPSHr (m)	Efficiency η (%)
		m³/h	L/s			Shaft Power	Motor Power
125D25×2	2	108	30	40	2950	15.6	18.5	4	76
125D25×3	3	108	30	60	2950	23.4	30	4	76
125D25×4	4	108	30	80	2950	31.2	37	4	76
125D25×5	5	108	30	100	2950	39	45	4	76
125D25×6	6	108	30	120	2950	46.8	55	4	76
125D25×7	7	108	30	140	2950	54.6	75	4	76
125D25×8	8	108	30	160	2950	62.4	75	4	76
125D25×9	9	108	30	180	2950	70.3	90	4	76
125D25×10	10	108	30	200	2950	78	90	4	76
Model	Stages	Flow (Q)		Head (m)	Speed (r/min)	Power (kW)		NPSHr (m)	Efficiency η (%)
		m³/h	L/s			Shaft Power	Motor Power
150D30×2	2	162	45	54.6	2950	31.46	37	4.1	76.6
150D30×3	3	162	45	81.9	2950	47.19	55	4.1	76.6
150D30×4	4	162	45	109.2	2950	62.92	75	4.1	76.6
150D30×5	5	162	45	136.5	2950	78.65	90	4.1	76.6
150D30×6	6	162	45	163.8	2950	94.38	110	4.1	76.6
150D30×7	7	162	45	191.1	2950	110.11	132	4.1	76.6
150D30×8	8	162	45	218.4	2950	125.84	160	4.1	76.6
150D30×9	9	162	45	245.7	2950	141.57	160	4.1	76.6

Installation Diagram

Performance Data（2）

Model	Stages	L	L1	L2	L3	L4	L5	B	B1	H	H1	H2	H3	H4	n-φd
50D8×2	2	960	65	490	730	135	345	355	290	230	160	90	100	25	4-φ20
50D8×3	3	1163	113	550	815	145	390	360	300	240	160	100	145	25	4-φ20
50D8×4	4	1141	136	580	890	180	410	360	340	242	160	112	153	25	4-φ20
50D8×5	5	1274	226	710	1120	270	485	370	370	242	160	132	183	25	4-φ20
50D8×6	6	1332	226	710	1120	270	485	370	370	242	160	132	183	25	4-φ20
50D8×7	7	1390	226	710	1120	270	485	370	370	242	160	132	183	25	4-φ20
50D8×8	8	1448	310	770	1230	300	485	370	370	242	160	132	183	25	4-φ20
50D8×9	9	1508	310	770	1230	300	485	370	370	242	160	132	183	25	4-φ20
50D8×10	10	1689	362	949	1515	420	610	370	405	255	160	160	225	25	4-φ20
50D8×11	11	1747	362	940	1515	420	610	370	405	255	160	160	225	25	4-φ20
50D8×12	12	1805	362	940	1515	420	610	370	405	255	160	160	225	25	4-φ20
Model	Stages	L	L1	L2	L3	L4	L5	B	B1	H	H1	H2	H3	H4	n-φd
80D12×2	2	1139	121	610	860	130	390	410	300	245	210	100	145	25	4-φ20
80D12×3	3	1304	232	770	1130	235	485	410	365	247	210	132	183	25	4-φ20
80D12×4	4	1374	232	770	1130	235	485	410	365	247	210	132	183	25	4-φ20
80D12×5	5	1444	232	770	1130	235	485	410	365	247	210	132	183	25	4-φ20
80D12×6	6	1639	273	990	1385	230	610	410	410	260	210	160	225	25	4-φ20
80D12×7	7	1709	273	990	3185	230	610	410	410	260	210	160	225	25	4-φ20
80D12×8	8	1779	403	1020	1600	415	610	410	410	260	210	160	225	25	4-φ20
80D12×9	9	1849	403	1020	1600	415	610	410	410	260	210	160	225	25	4-φ20
80D12×10	10	1919	403	1020	1600	415	610	410	410	260	210	160	225	25	4-φ20
80D12×11	11	2034	471	1110	1775	480	655	410	410	260	210	160	225	25	4-φ20
80D12×12		2104	471	1110	1775	480	655	410	410	260	210	160	225	25	4-φ20
Model	Stages	L	L1	L2	L3	L4	L5	B	B1	H	H1	H2	H3	H4	n-φd
100D16×2	2	1395	131	785	1175	225	615	450	450	280	220	160	225	30	4-φ20
100D16×3	3	1475	131	785	1175	225	615	450	450	280	220	160	225	30	4-φ20
100D16×4	4	1600	191	865	1300	245	660	450	450	280	220	160	225	30	4-φ20
100D16×5	5	1705	231	910	1380	285	695	450	450	300	220	180	250	30	4-φ20
100D16×6	6	1890	292	1015	1620	385	790	485	485	310	220	200	275	35	4-φ20
100D16×7	7	1970	292	1015	1620	385	790	485	485	310	220	200	275	35	4-φ20
100D16×8	8	2050	372	1095	1780	465	790	485	485	310	220	200	275	35	4-φ20
100D16×9	9	2130	372	1095	1780	465	790	485	485	310	220	200	275	35	4-φ20
100D16×10	10	2250	433	1175	1885	485	830	450	515	335	220	225	305	35	4-φ20
100D16×11	11	2445	491	1325	2150	590	945	455	580	360	220	250	325	35	4-φ20
100D16×12	12	2525	491	1325	2150	590	945	455	580	360	220	250	325	35	4-φ20
Model	Stages	L	L1	L2	L3	L4	L5	B	B1	H	H1	H2	H3	H4	n-φd
125D25×2	2	1619	151	855	1230	185	660	530	420	330	270	160	225	40	4-φ24
125D25×3	3	1849	225.5	980	1510	310	790	530	485	330	270	200	275	40	4-φ24
125D25×4	4	1949	225.5	980	1510	310	790	530	485	330	270	200	275	40	4-φ24
125D25×5	5	2089	300	1075	1635	335	830	540	540	345	270	225	305	40	4-φ24
125D25×6	6	2304	351.5	1190	1835	385	945	540	590	370	270	250	325	40	4-φ24
125D25×7	7	2486	627	1510	2115	310	1018	540	640	400	270	280	360	40	4-φ24
125D25×8	8	2586	627	1510	2115	310	1018	540	640	400	270	280	360	40	4-φ24
125D25×9	9	2736	779	1680	2370	360	1068	540	640	400	270	280	360	40	4-φ24
125D25×10	10	2836	779	1680	2370	360	1068	540	640	400	270	280	360	40	4-φ24
Model	Stages	L	L1	L2	L3	L4	L5	B	B1	H	H1	H2	H3	H4	n-φd
150D30×2	2	1859	193	975	1410	205	793	600	500	380	320	200	275	45	4-φ24
150D30×3	3	2129	249	1120	1650	265	948	600	600	380	320	250	325	45	4-φ24
150D30×4	4	2314	306	1210	1835	325	1018	600	650	390	320	280	360	45	4-φ24
150D30×5	5	2479	365	1290	2000	380	1068	600	650	400	320	280	360	45	4-φ24
150D30×6	6	/	/	/	/	/	/	/	/	/	/	/	/	/	/
150D30×7	7	/	/	/	/	/	/	/	/	/	/	/	/	/	/
150D30×8	8	/	/	/	/	/	/	/	/	/	/	/	/	/	/
150D30×9	9	/	/	/	/	/	/	/	/	/	/	/	/	/	/

Outline Drawing（2）

	Dimensions	Suction Flange				Discharge Flange
	Model	Dg	Do	D	n-do	Dg	Do	D	n-do
	50D8	75	150	185	4-φ18	50	125	160	4-φ18
	80D12	80	150	185	4-φ18	80	160	195	4-φ18
	100D16	100	170	205	4-φ18	100	180	215	8-φ18
	125D25	125	200	235	8-φ18	125	210	245	8-φ18
	150D30	150	225	260	8-φ18	150	240	280	8-φ18

Pump Head Equation:

 

Hydraulic Parameters and Installation Height Calculation

• P₁: Inlet pressure of the pump (MPa)

• P₂: Outlet pressure of the pump (MPa)

• Z₁: Vertical distance from the inlet pressure gauge to the pump shaft centerline (m)

• Z₂: Vertical distance from the outlet pressure gauge to the pump shaft centerline (m)

• V₁: Flow velocity at the inlet measurement point (m/s)

• V₂: Flow velocity at the outlet measurement point (m/s)

• ρ: Liquid density (kg/m³)

• g: Gravitational acceleration (9.8 m/s²)

Calculation of Pump Installation Height (Hg)

Hg refers to the vertical distance from the pump shaft centerline to the inlet liquid level and can be estimated by the following formula:

Hg ≤ P₀ − [NPSH] − P′ − Δh − 0.5 (m)

Where:

• P₀: Atmospheric pressure (or absolute pressure at the suction liquid surface), in meters of water column

• [NPSH]: Net Positive Suction Head required by the pump (m)

• P′: Vapor pressure of the pumped liquid (m water column)

• Δh: Hydraulic loss in the suction pipeline (m)

Note:
If Hg is positive, the pump shaft centerline is located above the liquid level (suction lift).
If Hg is negative, the pump operates under flooded suction conditions (submerged inlet).

Performance Dependency

The actual values of pump flow rate (Q), head (H), and shaft power (N) depend on the actual running speed of the pump.

Pump Head Equation:（2）

OEM & Custom

Chaodun Pump provides OEM and ODM customization for D series horizontal multistage centrifugal pumps. Options include stainless-steel or cast-iron materials, mechanical seal types, and customized nameplates, packaging, and color design for global distributors.

FAQs

1. 1. What type of liquids can the D series pump handle?
   The pump is suitable for clean water and liquids with similar properties, and can be customized for hot water or light oils.
2. 2. Can the D series pump be used as a boiler feed pump?
   Yes, the D series is ideal for small and medium-sized boiler feed systems.
3. 3. What materials are available for the D series pump?
   The standard material is cast iron, with optional stainless steel available for enhanced corrosion resistance.
4. 4. Does Chaodun Pump offer OEM customization services?
   Yes, we offer OEM customization services including logo, color, and nameplate customization for export clients.
5. 5. How is the pump packaged for export?
   Each pump is packed in a fumigation-free wooden case suitable for sea transport, ensuring safe delivery.
6. 6. What is the temperature range for the D series pump?
   The standard design supports liquid temperatures from -20°C to +110°C, with custom versions available for higher temperature applications.
7. 7. What are the main applications of the D series pump?
   The D series pump is widely used in building water supply, fire protection systems, industrial water circulation, and boiler feed water systems.