model	转速 r/min	流量 m3/h	扬程 m	电机功率 kw	(NPSH)r m	单泵质量 kg	model	转速 r/min	流量 m3/h	扬程 m	电机功率 kw	(NPSH)r m	单泵质量 kg
CIS50-32-125	2900	7.5	22	2.2	2	29	CIS65-50-125	2900	15	21.8	3	2	35
		12.5	20		2				25	20		2.5
		15	18.5		2.5				30	18.5		3
	1450	3.75	5.4	0.55	2			1450	7.5	5.35	0.55	2
		6.3	5		2				12.5	5		2
		7.5	4.6		2.5				15	4.7		2.5
CIS50-32-125A	2900	11	15	1.5	2		CIS65-50-125A	2900	22	15	2.2	2
	1450	5.5	3.7	0.55	2			1450	11	3.7	5.5	2
CIS50-32-160	2900	7.5	34.3	3	2	40	CIS65-50-160	2900	15	34	4	2	42
		12.5	32		2				25	32		2
		15	29.6		2.5				30	31		2.5
CIS50-32-160	1450	3.75	8.5	0.55	2	40	CIS65-50-160	1450	7.5	8.5	0.75	2	42
		6.3	8		2				12.5	8		2
		7.5	7.5		2.5				15	7.2		2.5
CIS50-32-160A	2900	11	24	3	2		CIS65-50-160A	2900	22	24	3	2.5
	1450	5.5	6	0.55	2			1450	11	6	0.55	2
CIS50-32-200	2900	7.5	52.5	5.5	2	45	CIS65-40-200	2900	15	53	7.5	2	46
		12.5	50		2				25	50		2
		15	48		2.5				30	47		2.5
	1450	3.75	13.1	0.75	2			1450	7.5	13.2	1.1	2
		6.3	12.5		2				12.5	12.5		2
		7.5	12		2.5				15	11.8		2.5
CIS50-32-200A	2900	11	38	4	2		CIS65-40-200A	2900	22	38	5.5	2
	1450	5.5	9.5	0.55	2			1450	11	9.5	0.75	2
CIS50-32-25	2900	7.5	82	11	2	79	CIS65-40-250	2900	15	82	15	2	82
		12.5	80		2				25	80		2
		15	78.5		2.5				30	78		2.5
	1450	3.75	20.5	1.5	2			1450	7.5	21	2.2	2
		6.3	20		2				12.5	20		2
		7.5	19.5		3				15	19.4		2.5
CIS50-32-250A	2900	11	61	7.5	2		CIS65-40-250A	2900	22	61	11	2
	1450	5.5	15.3	1.1	2			1450	11	15.3	1.5	2
CIS65-40-315	2900	15	127	30	2.5	90	CIS80-50-250	2900	30	84	22	2.5	84
CIS65-40-315	2900	15	127	30	2.5	90	CIS80-50-250	2900	30	84	22	2.5	84
		25	125		2.5				50	80		2.5
		30	123		3				60	75		3
	1450	7.5	32.3	4	2.5			1450	15	21	3	2.5
		12.5	32		2.5				25	20		2.5
		15	31.7		3				30	18.8		3
CIS65-40-315A	2900	22	97	22	2.5		CIS80-50-250A	2900	45	61	18.5	2.5
	1450	11	24	3	2.5			1450	22	15.3	2.2	2.5
CIS80-65-125	2900	30	22.5	5.5	3	44	CIS80-50-315	2900	30	128	37	2.5	109
		50	20		3				50	125		2.5
		60	18		3.5				60	123		3
	1450	15	5.6	0.75	2.5			1450	15	32.5	5.5	2.5
		25	5		2.5				25	32		2.5
		30	4.5		3				30	31.5		3
CIS80-65-125A	2900	45	15	4	3		CIS80-50-315A	2900	45	97	30	2.5
	1450	22	3.7	0.55	2.5			1450	22	24	4	2.5
CIS80-65-160	2900	30	36	7.5	2.5	43	CIS100-80-125	2900	60	24	11	4	45
		50	32		2.5				100	20		4.5
		60	29		3				120	16.5		5
	1450	15	9	1.5	2.5			1450	30	6	1.5	2.5
		25	8		2.5				50	5		2.5
		30	7.2		3				60	4		3
CIS80-65-160A	2900	45	24	5.5	2.5	43	CIS100-80-125A	2900	90	15	7.5	4.5	45
	1450	22	6	1.1	2.5			1450	45	3.7	1.1	2.5
CIS80-50-200	2900	30	53	15	2.5	46	CIS100-80-160	2900	60	36	15	3.5	63
		50	50		2.5				100	32		4
		60	47		3				120	28		5
	1450	15	13.2	2.2	2.5			1450	30	9.2	2.2	2
		25	12.5		2.5				50	8		2.5
		30	11.8		3				60	6.8		3.5
CIS80-50-200A	2900	45	38	11	2.5		CIS100-80-160A	2900	90	24	11	4
	1450	22	9.5	1.5	2.5			1450	45	6	1.5	2.5
CIS100-65-200	2900	60	54	22	3	65	CIS125-100-250	2900	120	87	75	3.8	129
		100	50		3.6				200	80		4.2
		120	47		4.8				240	72		5
	1450	30	13.5	4	2			1450	60	21.5	11	2.5
		50	12.5		2				100	20		2.5
		60	11.8		2.5				120	18.5		3
CIS100-65-200A	2900	90	38	18.5	3.6		CIS125-100-250A	2900	180	61	55	4.2
	1450	45	9.5	3	2			1450	90	15.3	7.5	2.5
CIS100-65-250	2900	60	87	37	3.5	91	CIS125-100-315	2900	120	132.5	110	4	145
		100	80		3.8				200	125		4.5
		120	74.5		4.8				240	120		5
	1450	30	21.3	5.5	2			1450	60	33.5	15	2.5
		50	20		2				100	32		2.5
		60	19		2.5				120	30.5		3
CIS100-65-250A	2900	90	61	30	3.8		CIS125-100-315A	2900	180	97	90	4.5
	1450	45	15.3	4	2			1450	90	24	11	2.5
CIS100-65-315	2900	60	133	75	3	120	CIS125-100-400	1450	60	52	30	2.5	201
		100	125		3.6				100	50		2.5
		120	118		4.2				120	48.5		3
	1450	30	34	11	2		CIS125-100-400A	1450	90	38	22	2.5
		50	32		2
		60	30		2.5		CIS150-125-200	1450	120	14	11	3	118
CIS100-65-315A	2900	90	97	55	3.6				200	12.5		3.2
	1450	45	24	7.5	2				240	11		3.5
CIS125-100-200	2900	120	57.5	45	4.5	95	CIS150-125-250	1450	120	22.5	18.5	3	140
		200	50		4.5				200	20		3
		240	44.5		5				240	17.5		3.5
	1450	60	14.5	7.5	2.5		CIS150-125-315	1450	120	34	30	2.5	188
		100	12.5		2.5				200	32		2.5
		120	11		3				240	29		3
CIS125-100-200A	2900	180	38	37	4.5	95	CIS150-125-250A	1450	180	15	15	3	140
	1450	90	9.5	5.5	2.5
CIS200-150-250A	1450	360	15	30	3.5	165	CIS150-125-315A	1450	180	24	22	2.5	188
CIS150-125-400	1450	120	53	45	2	212	CIS200-150-315	1450	240	37	55	3	237
		200	50		2.8				400	32		3.5
		240	46		3.5				460	28.5		4
CIS150-125-400A	1450	180	38	37	2.8		CIS200-150-315A	1450	360	24	45	3.5
CIS200-200-200	1450	240	14.5	18.5	3.5	141	CIS200-150-400	1450	240	55	90	3	245
		400	12.5		4.2				400	50		3.8
		460	9.5		4.5				460	45		4.5
CIS200-150-250	1450	240	22.6	37	3.6	165	CIS200-150-400A	1450	360	38	75	3.8
		400	20		4.6
		460	17.2		4.9

How to choose a marine horizontal centrifugal pump?

1) First, clarify the application and system type (determine pump type and requirements). Different applications of marine centrifugal pumps require different selection considerations:

Seawater cooling/firefighting/general seawater pumps: corrosion resistance, cavitation resistance, reliability, emergency power supply/self-priming requirements (firefighting often has specific regulations).

Freshwater circulation/central cooling/domestic water: corrosion resistance requirements are relatively low, but hygiene, noise, and efficiency must be considered.

Bottom/ballast/general transport: may contain impurities, gas, and operate intermittently; requires certain anti-clogging capabilities or lower NPSH requirements.

Fuel oil/lubricating oil transport: centrifugal pumps may not be suitable (efficiency drops significantly at high viscosity); gear/screw pumps are more suitable in many scenarios; if a centrifugal pump is insisted upon, viscosity correction and starting torque must be calculated.

2) Determine key operating parameters (determine hydraulic selection).

At least the following should be provided:

Flow rate Q: normal/maximum/minimum (m³/h). Head H: Includes static head + piping losses + valve/heat exchanger/filter pressure drop + margin (m).

Medium: Seawater/fresh water/oil/containing solids; temperature; density; whether it contains gas or sand.

Operating mode: Continuous/intermittent; whether parallel redundancy is required (common onboard “1 in use, 1 standby” or “2 × 50%”).

Selection principles (experience):

Ensure the operating point falls near the pump’s optimal efficiency point (BEP). It is generally recommended to operate within 70%–110% of the BEP flow rate to avoid prolonged low flow rates leading to overheating, vibration, and reduced bearing seal life.

When flow rate adjustment is required, prioritize variable frequency drives (VFDs) over long-term throttling.

3) Calculate suction conditions and cavitation margin (very critical for marine applications)
Calculate the NPSHa available from the system, ensuring that:

NPSHa ≥ NPSHr (pump sample) + safety margin (usually ≥0.5–1.0 m or as recommended by the classification society/manufacturer). Key factors affecting NPSHA:
* Suction head (pump centerline position relative to liquid level)
* Losses caused by suction pipe diameter, length, bends, and filters/seagates
* Medium temperature (higher temperatures increase cavitation risk). Seawater cooling pumps are often installed near seagates, where suction conditions are better; however, if the pump is positioned high or the suction piping is complex, cavitation should be carefully monitored.

4) Pump structure selection: Single-stage/multi-stage, end-suction/split-case, self-priming
* Single-stage horizontal end-suction pump: Most common, simple structure, easy maintenance, suitable for low to medium head systems (cooling, general transport).
* Split-case (double-suction) pump: High flow rate, lower NPSH, easy maintenance, commonly used for high flow rates in fire fighting/ballast applications.
* Multi-stage centrifugal pump: High head requirements (e.g., boiler feedwater typically uses more specialized feedwater pump series).
* Self-priming capability: Centrifugal pumps are inherently not self-priming. If the system may have air intake or requires self-priming (e.g., some bilge systems, emergency pumping), a self-priming centrifugal pump or a priming device/vacuum priming should be selected.

5) Materials and Corrosion Protection (Highest Priority for Seawater Systems)

Materials Selection by Media:

Seawater: Common materials include bronze/aluminum bronze, duplex stainless steel (2205, etc.), and seawater-resistant cast iron with anti-corrosion coating (depending on grade and budget). The key is matching the impeller, pump body, and shaft sleeve materials to avoid electrochemical corrosion.

Freshwater: Ductile iron/cast iron with rust prevention treatment, stainless steel, etc.

Containing solids/sand: Wear-resistant materials, replaceable wear rings, reduced speed, or a more wear-resistant structure. Also consider: Sacrificial anode/insulation measures (common in seawater pumps)
Corrosion risks associated with pairing with other metals in the system.

6) Shaft Seal and Bearing Configuration (Related to Leakage and Lifespan)

Mechanical Seals: Mainstream for marine applications. For seawater, it is recommended to select suitable friction pairs (such as SiC/SiC, etc.) and flushing/cooling solutions.

Stuffing Seals: Simple structure but prone to leakage and frequent maintenance; gradually reduce their use.

Pay attention to the sealing chamber pressure and the risk of dry running (centrifugal pumps should not be run dry for extended periods). Bearings: Select vibration-resistant, long-life bearings, and confirm lubrication methods and installation direction limitations.

7) Drive, Electrical, and Control Systems (Must be compatible onboard)

Motor Power Supply: Common marine types include 440V/60Hz or 380V/50Hz; protection rating (IP), insulation class, and marine motor certification.

Speed/Frequency: Higher speeds at 60Hz will affect pump performance and NPSH (the same pump will show significant differences under 50/60Hz operating conditions).

Starting Method: Direct start/soft start/variable frequency; for high-power pumps, calculate the impact of starting current on the power grid.

Couplings and Base: Higher requirements for coaxiality and foundation rigidity are needed in ship vibration environments.

8) Classification Societies and Standards/Certifications (To avoid problems during later ship inspections)
Confirm whether the pump (and motor, control cabinet) requires and provide the corresponding certificates, such as:

Type approval from classification societies such as CCS / ABS / DNV / LR

Fire pumps may involve SOLAS/fire protection standards regarding flow rate, head, emergency power supply, and layout requirements.

9) Maintenance and Spare Parts (Onboard “Maintainability” is Important)
Is it a pull-out design (rotor components can be removed without disassembling the piping)?
Are vulnerable parts (mechanical seals, bearings, wear rings) universal, and what is their delivery time?
Are tools required, and how crew-friendly is it for maintenance?