D Series Horizontal Multistage Centrifugal Pump High Pressure

Product Overview 

The D Series Single Suction Multistage Clean Water Pump is a high-efficiency multistage centrifugal pump designed for a wide range of applications, featuring stable performance, low noise, long lifespan, and easy installation and maintenance. This pump is primarily used for transporting clean water and other non-corrosive liquids with physical and chemical properties similar to water, making it ideal for industrial, agricultural, and municipal water supply systems.

Model Designation

Main Features 

• Advanced hydraulic design ensures high efficiency and a wide range of operational performance.

• Low noise operation, suitable for environments requiring long-term continuous operation.

• Reliable sealing technology, including packing gland seals and mechanical seals, simplifying maintenance.

• Standard motor coupling allows for flexible installation and use.

Engineering Overview

The D Series pumps are designed using computer-aided design (CAD) and performance optimization technology, with extensive manufacturing experience and a comprehensive testing facility, ensuring stability and reliability under varying operational conditions. All pump bodies are made of corrosion-resistant materials, enhancing the pump’s service life.

Typical Applications 

The D Series pumps are widely used in the following fields:

• Industrial and municipal water supply and drainage

• High-rise building water supply systems

• Hot water circulation and boiler feedwater

• Firefighting pressure boosting systems

• Irrigation and agricultural watering

• Food processing, chemical, and pharmaceutical industries

System Configuration

The system consists of several core components to ensure efficient and stable operation:

• Pump shaft and shaft sleeve

• Suction casing and intermediate casing

• Discharge casing and tail cover

• Efficient impeller and diffuser design

• Sealing system and bearing components

Components and Supply 

The system includes:

• Suction casing and intermediate casing

• Diffuser baffle and discharge diffuser

• Mechanical seals and bearings

• Motor and drive system

• Necessary installation accessories and parts

Technical Services

The D Series pumps offer comprehensive technical services to ensure long-term stability for users. Service offerings include:

• Installation and commissioning

• Regular maintenance and servicing

• Operation training and technical support

Operating Conditions

• Suitable for clean water or liquids with properties similar to water.

• Maximum liquid temperature: ≤ 110°C.

• Inlet pressure: less than 0.6 MPa.

• Bearing lubrication: calcium-based grease.

Service Conditions 

• Fire hydrant systems: Flow rate of 2.5L/S or 5L/S per nozzle, with water column lengths of 7m, 10m, or 13m.

• Automatic sprinkler systems: Flow rate of 1.0L/S per sprinkler, with sprinkler pressure at 0.1 MPa.

• Ambient temperature: 5°C to 40°C.

Protection Features 

The D Series pumps are equipped with multiple protection features, including:

• Overload protection

• Overpressure protection

• Bearing temperature monitoring

• Mechanical failure alarm system

Selection Standards 

The selection of D Series pumps should be based on the specific application scenario, required flow rate, and pump head requirements. Considerations should also include installation space, maintenance convenience, and the long-term stability of the system.

Installation & Dimensions

Outline Drawing

Performance Data

1	Bearing Cover	2	Nut	3	Bearing	4	Water Deflector Sleeve	5	Bearing Bracket	6	Shaft Sleeve (A)	7	Packing Gland	8	Lantern Ring
9	Suction Casing	10	Intermediate Sleeve	11	Wear Ring	12	Impeller	13	Middle Casing	14	Diffuser Baffle	15	Diffuser Sleeve	16	Tension Bolt
17	Outlet Diffuser	18	Balance Ring	19	Balance Ring	20	Balance Disc	21	Discharge Casing	22	Tail Cover	23	Shaft	24	Shaft Sleeve (B)

Performance Parameters

Model	Stages	Flow Rate (Q)		Head (m)	Speed (r/min)	Power (kW)		NPSH (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 Rate (Q)		Head (m)	Speed (r/min)	Power (kW)		NPSH (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 Rate (Q)		Head (m)	Speed (r/min)	Power (kW)		NPSH (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 Rate (Q)		Head (m)	Speed (r/min)	Power (kW)		NPSH (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 Rate (Q)		Head (m)	Speed (r/min)	Power (kW)		NPSH (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	Number of 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	Number of 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	Number of 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	Number of 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	Number of 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）

Performance Data（3）

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 Installation & Performance

Calculation of pump head H:

n the formula:

• 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 center (m)

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

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

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

• ρ: Liquid density (kg/m³)

• g: Gravitational acceleration (9.8 m/s²)

Calculation of Pump Installation Height (Hg)
(Installation height refers to the vertical distance from the pump shaft centerline to the inlet liquid level.)

Hg ≤ P0 – [NPSH] – P’ – Δh – 0.5 (m)

In the formula:

• P0: Atmospheric pressure (or absolute pressure at the inlet liquid level) (m water column)

• [NPSH]: Required NPSH (Net Positive Suction Head) of the pump (m)

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

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

Note:

• When the calculated value of Hg is positive, it indicates that the pump shaft center is above the inlet liquid level.

• When the calculated value is negative, it indicates that the pump is operating under flooded suction conditios.

Calculated according to the following formulas:

Operating Manual

(I) Installation:

1. Preparations before installation:

   • (1) Inspect the pump and motor.

   • (2) Prepare tools and lifting equipment.

   • (3) Verify the foundation of the unit.

2. Installation procedure:

   • (1) If the complete pump set is delivered to the site with the baseplate and motor pre-mounted and leveled, the pump and motor do not need to be removed.

   • (2) Place the baseplate on the foundation. Insert wedge-shaped shims near the foundation bolts and raise the baseplate by about 20–40 mm to allow for grouting after leveling.

   • (3) Use a level gauge to check the levelness of the baseplate. After leveling, tighten the foundation nuts and grout the baseplate with cement mortar.

   • (4) After the cement has cured for 3–4 days, recheck the levelness.

   • (5) Clean any dirt from the supporting surfaces of the baseplate, pump feet, and motor feet, then place the pump and motor on the baseplate.

   • (6) Adjust the pump shaft to ensure it is level. After leveling, tighten the nuts to prevent movement. Once the adjustment is complete, install the motor. If the level is incorrect, insert steel shims and leave an appropriate clearance between the pump and coupling.

   • (7) Place a straightedge on the coupling to check if the pump shaft centerline aligns with the motor shaft centerline. If they do not align, insert thin shims under the motor or pump feet so the two coupling faces are flush with the straightedge. Then, remove the thin shims and replace them with a machined solid steel plate, and recheck the installation condition.

   • To check the installation accuracy, use a feeler gauge at several positions around the coupling faces to measure the gap. The difference between the maximum and minimum gap should not exceed 0.3 mm, and the difference between the centerlines at the two ends (up/down or left/right) should not exceed 0.1 mm.

(II) Start-up & Shutdown:

1. Start-up:

   • (1) Wipe off the oil applied on the shaft and other lubricated parts.

   • (2) Clean the bearings and oil chamber with gasoline and wipe them dry with cotton yarn.

   • (3) Fill the bearing housing with calcium-based grease.

   • (4) After successful test running, check whether the motor’s rotation direction is correct. Prevent reverse rotation of the pump as it could loosen nuts, and then start the motor.

   • (5) Fill the pump with water or prime it.

   • (6) Close the valve and pressure gauge cock on the discharge pipeline.

   • (7) Once the above steps are complete, start the motor and open the pressure gauge cock.

   • (8) After the pump reaches normal speed and the pressure gauge shows appropriate pressure, open the vacuum gauge cock and gradually open the gate valve on the discharge pipeline until the required pressure is reached.

2. Shutdown:

   • (9) When stopping the pump, slowly close the gate valve on the discharge pipeline, close the vacuum gauge cock, stop the motor, and finally close the pressure gauge cock.

   • (10) If the pump is out of service for an extended period, disassemble it, wipe off any water on the pump parts, and apply anti-rust oil to the sliding surfaces for proper storage.

(III) Operation:

1. Monitoring:

   • (1) Monitor the temperature of the pump bearings. It should not exceed the ambient temperature by more than 35°C, and the maximum temperature should not exceed 75°C.

   • (2) Normal leakage in the stuffing box should not exceed about 15 ml per minute. The packing gland should be adjusted as necessary to maintain proper tightness.

   • (3) Periodically check the coupling and monitor the motor bearing temperature rise.

   • (4) If any noise or abnormal sounds occur during operation, immediately stop the pump and investigate the cause.

OEM & Custom

We offer OEM/ODM customization for materials (cast iron, stainless steel, duplex steel), motor voltage (220V/415V/460V), and installation configuration. Explosion-proof motors, control panels, and base-mounted assemblies are available. All products are tested to ISO9001 and CE standards, ensuring high performance and reliability for export projects.

FAQs

1. Q: What is the main application of the D series pump?
   A: It is widely used for industrial and municipal water supply, boiler feed, and pressure boosting for clean water systems.
2. Q: What’s the maximum temperature of the liquid?
   A: The D pump can handle liquids up to 80°C; special versions can operate up to 120°C.
3. Q: Can it be used for slightly corrosive liquids?
   A: Yes, with stainless steel wetted parts or optional mechanical seals for specific fluids.
4. Q: What is the maximum head?
   A: Depending on the model and stage number, the pump head can reach up to 232 meters.
5. Q: What are the maintenance requirements?
   A: Regular lubrication and seal inspection; no complex maintenance procedures are required.
6. Q: Do you support OEM voltage customization?
   A: Yes, we provide custom voltages and control systems for export markets.
7. Q: Which countries import this pump?
   A: The D series is exported to Southeast Asia, Africa, and South America for industrial and municipal water projects.