Description

CWF Series marine crushing pump

1.General

CWF Series marine pulverizing pump is the open impeller cenfrifugal discharge pump, which is used to pulverize and transferthe soft foul in the anitary sewage under 85℃. Themaximum dimeter of solid particle afetr circular pulverizing is within 5mm. It is also applicable to pulverize the coagulate of heavy oil under low temperature, in order to facilitate injection.

2.Main technical performance parameter

model	flow m3/h	扬 程 m	Net Positive Supplement (NPSH)r m	rotational speed r/min	motor power Kw
0.5CWF-10	5	10	5.0	2900	1.1
0.5CWF-20	5	20	5.0	2900	1.5
1CWF-11	10	11	5.0	2900	1.5
1CWF-15	10	15	5.0	2900	3
2CWF-11	20	11	5.0	2900	2.2
3CWF-10	30	10	5.0	2900	4
3CWF-30	30	30	5.0	2900	11

 

How to select a marine shredder pump?

Marine pulverizer pumps are devices that integrate pulverizing and conveying functions, primarily used for treating shipboard sewage, wastewater, and media containing fibers and solid impurities. Choosing the right marine pulverizer pump is crucial for ensuring the normal, safe, and environmentally friendly operation of shipboard wastewater treatment systems. The following is a more detailed purchasing guide:

I. Defining the Application Conditions

Wastewater Properties and Composition

Understand the types of solid impurities in the wastewater (e.g., fibers, ropes, paper scraps, plastic flakes, etc.).

Assess the maximum particle size and the presence of easily entangled substances.

Determine if it contains corrosive components (brine, grease, organic residue, etc.).

Discharge Requirements

Pump flow rate (m³/h) and head (m) to ensure it meets specific discharge and transport distance requirements.

Is it for continuous or intermittent operation?

Installation Environment

Submersible or dry installation.

Operating temperature range.

Installation space limitations.

II. Detailed Design of the Grinding Mechanism

Blade Type and Material

Generally, 316L stainless steel or higher corrosion-resistant alloys are used to ensure resistance to brine corrosion.

The blade design should be adaptable to effectively cut various fibers and solids. Excellent cutting angle design helps reduce clogging and improve grinding efficiency.

Some models are equipped with double blades or multi-stage cutting mechanisms to improve the grinding capacity for large solids.

Grinding Chamber Structure

A streamlined design ensures smooth feeding and avoids clogging.

The pulverizing chamber and impeller are combined in a design, with the impeller itself participating in the cutting process, improving efficiency.

Some pulverizing pumps have a hydrogen release channel to accommodate gaseous fluids.

Maximum Passing Particle Size

Different pulverizing pump designs typically allow for particles between 20 and 50 mm. When purchasing, choose a pump that matches the maximum solid size.

III. Motor and Pump Selection

Motor Parameters and Protection

Power rating must consider the medium viscosity, flow rate, head, and required pulverizing intensity. Generally, a 20%-30% margin should be allowed in the motor power.

Fully enclosed, cooled submersible motors are used, with a protection rating of IP68.

Insulation class should be at least F to ensure a safe motor lifespan.

Overload and overheat protection functions are provided.

Pump Body Material and Construction Process

Common materials are cast stainless steel 316L or super alloy, possessing excellent corrosion resistance and wear resistance.

High machining precision, with special sealing treatment at joints to prevent leakage.

Surface sandblasting or plating enhances corrosion resistance.

IV. Key Performance Parameters
* Flow Rate and Head

Selected rationally based on the ship’s wastewater production and drainage pipeline design.

A slightly higher flow rate and head can be selected to ensure system operational margin.

* Speed ​​and Efficiency

Generally designed for medium speed (1500-3000 rpm), balancing pulverizing effect and energy consumption.

High-efficiency impeller design reduces energy consumption and extends motor life.

* Impurity Limits

Pay attention to the pump’s limits on particle diameter and length to avoid overload and clogging.

V. Structural Design and Maintenance Ease
* Installation Method

Primarily submersible pulverizer pumps, requiring excellent sealing and waterproof design.

Easy to install in confined spaces on ships; rail-mounted installation is available for easy lifting and maintenance.

Maintenance and Disassembly

Quick disassembly design for pulverizing components facilitates regular cleaning and blade replacement.

High spare parts commonality ensures convenient maintenance.

Monitoring and Alarms

Features a clogging alarm function.

Motor status monitoring (temperature, vibration) assists in fault prevention.

VI. Compliance with Marine Standards and Certifications

Selected products should possess certifications from classification societies (CCS, ABS, DNV GL, etc.).

Meet relevant international standards for motors and pumps as stipulated by ISO and IEC.

Installation should include compliance certificates, adhering to marine environmental and safety regulations.

VII. After-Sales Service and Support
Preferably select experienced and technically strong professional marine pump manufacturers.

Provide timely spare parts supply and technical support.

Customized solutions for special operating conditions can be designed in collaboration with clients.

Maintenance and repair services are guaranteed during and after the warranty period.

VIII. Specific Selection Examples and Parameter References

parameter	Common range	illustrate
flow	5 ~ 50 m³/h	Confirmed based on wastewater volume and pipeline design
Pump head	10 ~ 50 m	Including necessary pipeline resistance and height difference
motor power	1.5 ~ 15 kW	Select according to load conditions
Maximum particle size	20 ~ 50 mm	Determined based on wastewater solids characteristics
Material	316L stainless steel or alloy	High corrosion resistance and wear resistance
Protection level	IP68	Essential for diving
Insulation class	Class F and above	Ensure safe operation of the motor
Startup method	Star-delta starter, soft starter	Reduce starting current surge

In summary the selection of marine pulverizing pumps requires consideration from multiple perspectives, including the nature of the wastewater, pulverizing capacity, motor performance, corrosion and wear resistance, ease of maintenance, and compliance with marine standards. This ensures that the equipment operates reliably and efficiently, is easy to maintain, and minimizes the risks associated with daily ship operations.