Description

W Series marine horizontal Swirl pump

W Series marine vortex pumps are applicable to pumping elear water and light erroding medium.

The pump rotates clockwise viewed from motor.

二、Pump model and performance parameters：

Serial Number	model	流量 （L/s）	扬程 （m）	转速 (r/min)	电机功率 (Kw)	必需汽蚀余量 (NPSH)r (m)
1	20W-20	0.1 0.2 0.25	28 20 15	2900	0.75	3 3.5 4
2	20W-65	0.1 0.2 0.25	80 65 50		2.2	3.5 4 4.5
3	25W-25	0.22 0.4 0.5	40 25 18		0.75	3.5 4 4.5
4	25W-70	0.22 0.4 0.5	110 70 52		3	4 4.5 5
5	32W-30	0.48 0.8 1	52 30 20		1.5	3.5 4 4.5
6	32W-75	0.48 0.8 1	115 75 53	2900	4	4.5 5 5.5
7	40W-40	1 1.5 1.8	60 40 26		4	4 5 6
8	40W-90	1 1.5 1.8	132 90 63		7.5	5.5 6.5 7.5
9	50W-45	1.7 2.5 3	66 45 28		5.5	5 6 7
10	65W-50	2.8 4 4.7	84 50 30		11	5.5 6.5 7.5

How to choose a marine horizontal vortex pump?

Horizontal installation means that the pump’s drive motor and pump body are on the same horizontal axis and connected by a coupling. Its advantages include:

Good stability: Low center of gravity, relatively low operating vibration.

Easy maintenance: Disassembly and inspection of the motor and pump are generally easier than with vertical pumps.

Balanced axial forces: In some designs, the rotor weight is supported by bearings, generating no additional axial force.

Foundation requirements: Requires a robust base, occupying deck or platform space, but with minimal height space requirements.

Marine Horizontal Vortex Pump Selection Core Steps

Step 1: Define Performance Requirements (Basic Parameters Unrelated to Pump Type)

Media: Clean water, seawater, fuel oil, lubricating oil? The media determines the material selection.

Key Point: Vortex pumps are only suitable for clean liquids free of large particles and long fibers. If the media is impure, a filter must be installed before the inlet.

Flow Rate and Head: This is fundamental to selection.

Vortex pumps are characterized by low flow rates and high heads. Determine the required rated points (Q, H) based on the system design.

Note: The shut-off head (head when the outlet valve is fully closed) of a vortex pump is very high, 1.5-2 times or more than the rated head. During selection, it must be confirmed that the piping system (including valves and instruments) can withstand this pressure.

Self-Priming Requirement: Is a self-priming function required?

Ordinary horizontal vortex pumps: Usually do not have self-priming capability or have very weak self-priming capability. The pump must be installed below the liquid level (positive pressure inlet) or priming must be performed before the first start-up.

Horizontal Self-Priming Vortex Pump: The pump body is designed with a liquid storage chamber and a gas-liquid separation chamber, enabling self-priming. This is a must-have for applications such as bilge pumps and sanitary water pumps. This distinction must be clearly defined during selection.

Step Two: Structural and Marine Compatibility Selection

This is the key point in selecting a horizontal vortex pump.

Material Selection (Corrosion Resistance):
Seawater/Saline Environments: Stainless steel (304 for general seawater, 316L for high-chloride environments) or bronze must be used.

Fuel Oil/Lubricating Oil: Cast iron can be used (low cost), but stainless steel is also recommended for high-quality systems or when long-term reliability is required.

Drinking Water/Sanitary Water: Stainless steel or food-grade coated cast iron is recommended.

Shaft Seal Type (Critical Reliability Component):
Mechanical Seal (Preferred):
Single-face Mechanical Seal: Suitable for clean media, high reliability, and minimal leakage.

Double-face Mechanical Seal: With isolation fluid flushing, used for hazardous, expensive, or media where any leakage is unacceptable (such as certain chemicals).

Materials: Friction pairs (dynamic/static rings) must be resistant to media corrosion; commonly used materials include silicon carbide, ceramics, and hard alloys.

Stuffing Seals: Low cost, tolerates minor wear and shaft runout.

Disadvantages: A small, controllable leak exists (a few drops per minute), requiring periodic gland adjustments. Not suitable for compartments where leakage is not permitted or where hazardous media are being transported.

Mechanical seals are gradually replacing sealing seals in marine applications.

Bearings and Lubrication:
Bearing Type: Deep groove ball bearings or angular contact ball bearings, with sufficient rated life.

Lubrication Methods:
Grease Lubrication: Long maintenance-free periods, a common choice. The grease type must be confirmed to be compatible with the operating temperature.

Oil Lubrication: Better heat dissipation, used in heavy-duty or high-speed applications, but with a more complex structure.

Motors and Drives:
Marine Certified Motors: Motors must meet marine environmental requirements.

Protection Rating: Minimum IP55 (dust and water jet protection), IP56/IP66 (strong water jet protection/sea wave protection) recommended for exposed areas in the engine room or deck.

Insulation class: Typically F or higher, ensuring reliability in high temperature and humidity environments.

Explosion-proof requirements: If used for pumping fuel oil or installed in hazardous areas, the motor must be explosion-proof (e.g., Ex d IIC T4).

Couplings: Flexible couplings (e.g., swivel couplings, elastic pin couplings) are typically used to compensate for installation misalignment and reduce vibration.

Step 3: Ship Code and Environmental Requirements

Classification Society Certification (Mandatory): The pump and motor, as a single unit, must obtain type approval from the classification society for which the target vessel is registered. Examples include CCS (China), DNV (Norway), ABS (USA), and LR (Lloyd’s Register). This is the baseline for safety and quality.

Vibration and Noise: Horizontal pumps require well-designed rotor dynamic balance and a stable base to control vibration.

For pumps near residential areas (such as day pumps), noise levels should be monitored, and soundproof covers or flexible joints should be installed if necessary.

Installation and Piping:

Base: Pump units typically come with a common base for easy installation and alignment. Ensure the base has sufficient rigidity.

Inlet Piping: To avoid cavitation, the inlet piping should be as short and straight as possible, with a diameter not smaller than the pump inlet. If the pump lacks self-priming capability, sufficient priming head (liquid level above the pump centerline) must be ensured.

Support: The pump’s inlet and outlet pipes should be independently supported to prevent the transfer of piping weight and thermal stress to the pump body.

Step 4: Brand, Maintenance, and Economy

Reliable Brand: Choose a brand with a long track record and good reputation in the marine market, and a well-established spare parts and after-sales service network.

Maintenance Ease: Check if the mechanical seal and bearings are easy to replace.

Is the pump body designed with a drain plug for easy venting of the medium before maintenance.

Selection Checklist

[ ] Operating conditions: Medium = ______; Flow rate = ______ m³/h; Head = ______ m; Self-priming required? Yes/No

[ ] Material: Pump body/impeller = (e.g., 316L stainless steel); Mechanical seal friction pair =

[ ] Certification: Requires a certificate from a classification society (e.g., CCS)

[ ] Motor: Voltage/frequency = ; Protection level ≥ IP; Explosion-proof requirement: Yes/No

[ ] Installation: Inlet/outlet diameter = DN______; Does it have a common base? Yes/No
Important Warning
Do not operate with valve closed: Vortex pumps must never be operated for extended periods with the outlet valve completely closed; otherwise, all power will be converted into heat, rapidly causing medium vaporization and pump overheating damage.

Cavitation prevention: Ensure the effective net positive suction head (NPSHa) is greater than the required net positive suction head (NPSHr), especially for non-self-priming pumps.