Description

Marine vertical centrifugal pump

I. General

Marine vertical centrifugal pumps are suitable for use as bilge pumps, ballast pumps, cooling pumps, fire pumps, and general utility pumps. They can be used to transport seawater, fresh water, and other non-corrosive liquid media with temperatures not exceeding 80℃.

II. Main Technical Performance Parameters

Serial Number	model	flow m3/h	Water pump head m	Motor power Kw	rotational speed r/min	(NPSH)r m
1	CLH25-25-6.5(Z)	3	8	0.37	2950	4.0
2	CLH25-25-6.5(Z)A	2.7	6.5	0.37	2950	4.0
3	CLH40-32-2(Z)	5	45	3	2950	4.0
4	CLH40-32-2.5(Z)	10	60	5.5	2950	4.0
5	CLH40-32-3(Z)	10	45	4.0	2950	4.0
6	CLH40-32-3.5(Z)	5	25	1.5	2950	4.0
7	CLH40-32-5(Z)	10	25	2.2	2950	4.0
8	CLH50-32-2(Z)	12.5	80	11	2950	3.0
9	CLH50-32-2(Z)A	11.7	70	7.5	2950	3.0
10	CLH50-32-2(Z)B	10.8	60	5.5	2950	3.0
11	CLH50-32-3(Z)	12.5	65	7.5	2950	3.0
12	CLH50-32-3.5(Z)	12.5	50	5.5	2950	3.2
13	CLH50-32-3.5(Z)A	10	45	4.0	2950	3.5
14	CLH50-32-4.5(Z)	12.5	32	3	2950	3.0
15	CLH50-32-4.5(Z)A	10	28	2.2	2950	3.0
16	CLH50-32-6.5(Z)	12.5	20	2.2	2950	2.5
17	CLH50-40-7(Z)	20	25	4	2950	4.0
18	CLH50-50-4.5(Z)	20	45	5.5	2950	5.0
19	CLH50-50-4.5(Z)A	18.6	38.5	5.5	2950	5.0
20	CLH65-40-2.5(Z)	25	125	30	2950	3.0
21	CLH65-40-2.5(Z)A	25	110	22	2950	3.0
22	CLH65-40-2.5(Z)B	22.7	103	22	2950	3.0
23	CLH65-40-2.5(Z)C	21.4	92	18.5	2950	3.0
24	CLH65-40-3(Z)	25	80	15	2950	4.0
25	CLH65-40-3(Z)A	23	70	11	2950	4.0
26	CLH65-40-4(Z)	25	65	11	2950	4.0
27	CLH65-40-4.5(Z)	25	50	7.5	2950	3.0
28	CLH65-40-4.5(Z)A	23	45	7.5	2950	3.0
29	CLH65-50-6.5(Z)	25	32	5.5	2950	3.0
30	CLH65-50-6.5(Z)A	23.4	28	4.0	2950	3.0
31	CLH65-50-6.5(Z)B	21.7	24	3.0	2950	3.0
32	CLH65-50-8.5(Z)	30	25	5.5	2950	4.0
33	CLH65-50-9(Z)	25	20	3	2950	3.0
34	CLH65-50-9(Z)A	23.8	17.6	2.2	2950	3.0
35	CLH65-65-5.5(Z)	30	45	7.5	2950	4.0
36	CLH65-65-5.5(Z)A	23.4	44	5.5	2950	4.0
37	CLH65-65-5.5(Z)B	21	35.3	4.0	2950	4.0
38	CLH80-50-3.5	50	125	37	2950	3.5
39	CLH80-50-3.5A	47.7	114	37	2950	3.5
40	CLH80-50-3.5B	45.4	103	30	2950	3.5
41	CLH80-50-3.5C	42	88.5	22	2950	3.5
42	CLH80-50-4	60	85	30	2950	4.0
43	CLH80-50-4.5	50	80	22	2950	3.5
44	CLH80-50-4.5A	46.8	70	18.5	2950	3.5
45	CLH80-50-5	50	65	18.5	2950	4.0
46	CLH80-50-5A	46.5	56	15	2950	4.0
47	CLH80-50-6.5	50	50	15	2950	3.0
48	CLH80-50-6.5A	46.8	44	11	2950	3.0
49	CLH80-50-6.5B	43.3	38	7.5	2950	3.0
50	CLH80-50-7(Z)	50	45	15	2950	3.5
51	CLH80-50-7(Z)A	46.5	39	11	2950	3.5
52	CLH80-65-5.5(Z)	50	60	18.5	2950	3.5
53	CLH80-65-5.5(Z)A	46.5	51.5	15	2950	4.0
54	CLH80-65-9(Z)	50	32	7.5	2950	3.0
55	CLH80-65-9(Z)A	46.8	28	7.5	2950	3.0
56	CLH80-65-9(Z)B	42	22	4.0	2950	3.0
57	CLH80-65-11(Z)	50	25	7.5	2950	3.5
58	CLH80-65-13(Z)	50	20	5.5	2950	3.0
59	CLH80-65-13(Z)A	46.7	16.6	4.0	2950	3.0
60	CLH100-65-5	100	125	75	2950	5.0
61	CLH100-65-5A	95.5	114	55	2950	5.0
62	CLH100-65-5B	90.8	103	45	2950	5.0
63	CLH100-65-5C	85.8	92	45	2950	5.0
64	CLH100-65-5.5	100	100	55	2950	5.0
65	CLH100-65-7(Z)	70	60	22	2950	4.0
66	CLH100-65-7(Z)A	65	52	18.5	2950	4.0
67	CLH100-65-8	100	60	30	2950	4.8
68	CLH100-65-9A	80	40	18.5	2950	4.5
69	CLH100-65-10(Z)	100	45	22	2950	5.0
70	CLH100-65-10(Z)A	86	38	15	2950	5.0
71	CLH100-80-6	100	90	45	2950	5.0
72	CLH100-80-6.5	100	80	37	2950	5.0
73	CLH100-80-13(Z)	70	25	11	2950	4.0
74	CLH100-80-13	100	32	15	2950	4.0
75	CLH100-80-13A	93.5	28	11	2950	4.0
76	CLH100-80-13B	82.4	21.7	11	2950	4.0
77	CLH100-80-19(Z)	100	20	11	2950	4.0
78	CLH100-80-19(Z)A	93	17	7.5	2950	4.5
79	CLH100-100-8.5(Z)	70	45	18.5	2950	4.5
80	CLH100-100-6	80	80	37	2950	4.0
81	CLH125-100-8	150	80	55	2950	5.0
82	CLH125-100-6.5	150	110	75	2950	5.0
83	CLH125-100-10	125	20	11	1450	4.5
84	CLH125-100-11	160	65	55	2950	5.0
85	CLH125-100-12	160	50	37	2950	5.5
86	CLH125-100-13	200	50	45	2950	4.5
87	CLH125-100-17(Z)	120	25	15	2950	5.5
88	CLH125-100-17(Z)A	114	22	11	2950	5.5
89	CLH125-100-17	160	32	22	2950	5.0
90	CLH125-100-17A	150	28	18.5	2950	5.0
91	CLH125-125-7	120	80	45	2950	4.0
92	CLH150-125-4	265	86	110	1450	4.5
93	CLH150-125-6	300	62	75	1450	5.5
94	CLH150-125-10	250	32	37	1450	7.5
95	CLH150-125-22(Z)	200	25	22	2950	7.0
96	CLH200-150-12	320	32	45	1450	5.0
97	CLH200-150-9	250	100	110	2950	7.0
98	CLH250-200-18	400	20	37	1450	5.0
99	CLH250-250-18	720	25	75	1450	6.0
100	CLH250-250-19	550	20	55	1450	6.0
101	CLH250-250-30	630	15	45	1450	6.0
102	CLH400-350-40	1000	10	55	960	8.5

How to select a marine vertical centrifugal pump？

This detailed purchasing guide for marine vertical centrifugal pumps will provide you with a comprehensive analysis from multiple aspects, including application requirements, technical parameters, structural features, material selection, installation and maintenance, and safety performance, to help you make a scientific and reasonable purchasing decision.

I. Understanding the Applications and Characteristics of Marine Vertical Centrifugal Pumps
Marine vertical centrifugal pumps are widely used in shipboard cooling water systems, fire protection systems, ballast systems, and for transferring liquids from oil tanks. Their vertical installation structure saves space, reduces axial force, and facilitates maintenance, making them particularly suitable for the compact space and demanding stability and sealing requirements of marine environments.

II. Clarifying Usage Requirements and Operating Parameters

**Transporting Medium:** Seawater, fresh water, fuel oil, lubricating oil, chemical liquids, etc. **Importances:** Does the medium contain impurities? Is it corrosive? What is its temperature range?

**Flow Rate and Head:** The design flow rate (m³/h or L/min) and head (m) of the marine pump should be selected. The pump should meet or even slightly exceed these design requirements.

**Medium Temperature and Viscosity:** High-temperature liquids or high-viscosity media require high-temperature resistant, wear-resistant materials and a matching pump type.

**Operating Pressure and Speed:** Marine pumps need to be matched with a motor speed, typically 1450 rpm or 2900 rpm (50Hz or 60Hz). Environmental Conditions

Marine environments are characterized by high salt spray and humid installation conditions, requiring pumps with excellent corrosion and salt resistance.

III. Pump Structure and Type Selection

1. Structural Forms
* Direct-coupled Vertical Pump

The motor is directly mounted on the top of the pump shaft, resulting in low axial load and a compact structure, suitable for space-constrained applications.

* Split-type Vertical Pump (Motor Separate)

The motor and pump body are installed separately and connected via a coupling, suitable for special operating conditions or ease of maintenance.

2. Impeller Type
* Single-suction Impeller

Single-sided suction inlet, simple structure, suitable for applications with relatively low flow rates.

* Double-suction Impeller

Double-sided suction inlet, reduces axial thrust, suitable for high flow rates and high heads.

3. Pump Bearings and Seals

Bearings are typically made of highly wear-resistant and corrosion-resistant materials to ensure long service life.

Seal methods include packing seals, mechanical seals, and magnetic seals. Marine pumps, with their high safety requirements, tend to use mechanical or magnetic seals to improve reliability and leak-proof performance.

IV. Material Selection Marine equipment is highly susceptible to seawater corrosion, making material selection crucial to pump lifespan.

Pump Body and Impeller

Common materials include: stainless steel (304, 316L), cast iron (corrosion resistant), bronze alloy, and high-performance alloys (such as Hastelloy).

For seawater media, 316L stainless steel or bronze alloy is preferred due to its excellent corrosion resistance.

Shaft and Seals

High-strength stainless steel or nickel-based alloys are used to ensure mechanical strength and corrosion resistance.

Seals are made of corrosion-resistant materials such as fluororubber and polytetrafluoroethylene (PTFE).

V. Performance Parameter Considerations
Flow-Head Curve Matching

When purchasing, refer to the pump’s performance curve to ensure the optimal operating point is close to the pump’s peak efficiency point (BEP).

Prevent operating conditions that deviate too far from the optimal point, leading to low efficiency, high vibration, and increased noise.

Efficiency and Energy Consumption

Optimize high-efficiency pumps to reduce overall ship energy consumption.

Allow a certain safety margin to avoid performance degradation due to changes in operating conditions.

Noise and Vibration

Marine equipment requires controlled noise and vibration levels. When purchasing, pay attention to the noise and vibration specifications provided by the manufacturer.

VI. Installation and Maintenance Requirements
Installation Space

One advantage of vertical pumps is their space-saving design, but installation and maintenance space still needs to be reserved.

Confirm the connection method between the pump and motor, and the dimensions of the piping interfaces.

Maintenance Ease

The pump’s structure should facilitate inspection and replacement of parts.

Maintenance cycle and ease of replacement for mechanical seals and bearings.

Protection Rating

Motor protection ratings typically require IP55 or higher to ensure the equipment is suitable for the humid environment of a ship.

VII. Safety Performance and Certification
Explosion-proof Design

Marine pumps, especially those conveying fuel oil or petroleum products, should have explosion-proof certification (e.g., Ex d or Ex e).

Explosion-proof motors and explosion-proof seals ensure safe operation in flammable and explosive environments.

Classification Society Certification

Purchase products with classification society certifications (e.g., CCS, ABS, DNV, LR) to ensure that the design and manufacture meet marine standards.

Emergency Stop and Protection Devices

Equipped with overload protection, temperature monitoring, and vibration detection devices to ensure equipment safety and stability.

VIII. Brand and After-Sales Service
Choose reputable marine equipment manufacturers to ensure product quality and technical support.

Pay attention to the manufacturer’s after-sales service capabilities, the timeliness of spare parts supply, and technical training support.

Consider comparing domestic and international brands, such as Grundfos, Wilo, ITT, and Shanghai No.1 Pump.

IX. Purchase Process Recommendations

step	illustrate
Needs Survey	Specify the medium characteristics, flow rate, head, temperature, installation conditions, etc.
Parameter verification	By comparing the pump performance curves, confirm the pump type selection and operating point.
Material determined	Select appropriate materials based on the corrosiveness of the medium.
Security assessment	Determine the requirements for explosion-proof, corrosion-proof, and protection levels.
Brands and Certifications	Choose manufacturers and brands with classification society certification.
Quotations and Comparisons	I received quotes from multiple suppliers and compared their quality, price, technical support, and delivery time.
Contracted Procurement	Confirm the contract and clarify the warranty terms and after-sales service.
Installation and debugging	Cooperate with the manufacturer to complete installation guidance, performance testing and commissioning.
Maintenance Plan	Develop routine maintenance and repair plans and arrange technical training.