Description

CGW Series marine sludge discharge pump

一、 General

The CGW series marine sewage pumps are electric, vertical, inline, single-channel impeller centrifugal discharge pumps (referred to as sewage pumps). This series of pumps is suitable for conveying domestic sewage, industrial wastewater, oily wastewater, fresh water, or seawater containing solid blocks with a diameter of 1/3 of the pump inlet diameter and fibrous materials with a length of 5 times the pump inlet diameter, at a temperature below 85℃. They are the optimal matching pumps for sewage treatment equipment.

二、Main technical performance parameter

Type	Q m3/h	Pressure Mpa	Motor poweer KW	Intel Pipe Diameter mm	Outlet Pipe Diameter mm
20CGW-3-6	3	0.06	0.37	20	20
25CGW-2-4	2	0.04	0.25	25	25
25CGW-5-10	5	0.10	0.55	25	25
25CGW-10-15	10	0.15	1.1	25	25
32CGW-8-15	8	0.15	1.1	32	32
32CGW-10-25	10	0.25	1.5	32	32
40CGW-10-15	10	0.15	1.1	40	40
40CGW-15-25	15	0.25	2.2	40	40

How to select a marine sewage pump?

I. Defining Operating Conditions and Requirements Analysis

Wastewater Properties: Since ship wastewater typically contains impurities such as fibers, ropes, suspended solids, and grease, the maximum size and density of solid particles in the wastewater must be determined to ascertain the pump’s processing capacity.

Flow Rate Requirements: Based on the ship’s toilet and shower wastewater discharge volume and the design of the hull sewage system, calculate the design flow rate, allowing a 20%~30% safety margin to ensure reliable operation.

Head Requirements: Calculate the required head based on the pipeline length from the pump station to the discharge point, the head level, and pipeline resistance to ensure smooth wastewater discharge.

Operating Environment: This includes wastewater temperature (generally ambient or slightly higher), saline environments, and submersible conditions. Salt corrosion resistance and sealing performance must be considered.

II. Pump Type Selection

Submersible Sewage Pumps: Suitable for submersible use, compact in structure, easy to install, and suitable for environments with limited space on board. Common types include submersible sewage pumps or submersible centrifugal pumps.

Centrifugal Sewage Pumps with Grinding Function: Suitable for wastewater containing larger solids or fibers, effectively preventing clogging.

Consider sewage pumps with cutting capabilities, especially for shipboard sewage containing a high amount of long fibrous materials, to reduce the risk of pipeline blockage.

III. Materials and Structural Design

Pump Body Material: Utilizes corrosion-resistant stainless steel, such as 316L stainless steel, to meet the corrosion requirements of marine seawater environments.

Impeller Design: The impeller shape should avoid open structures that easily entangle debris; semi-open or closed designs are more ideal. The impeller also uses corrosion-resistant materials.

Sealing Structure: Employs a double mechanical seal structure to effectively prevent media from entering the motor cavity. The sealing material is selected from wear-resistant and corrosion-resistant materials, such as fluororubber (FKM).

Protection Rating: The pump body and motor should meet an IP68 protection rating to prevent water and impurities from entering.

IV. Motor Performance and Protection

Motor Type: Submersible motor, using water or oil cooling to ensure continuous operational stability.

Protection Rating: IP68, suitable for long-term submersible operation.

Overload and Temperature Protection: Equipped with overload protection devices and temperature sensors to prevent motor overheating or abnormal load, improving equipment reliability.

Motor Power and Speed: Appropriate power is selected based on the design flow rate and head, generally with a suitable margin to avoid prolonged full-load operation. Speed ​​is generally between 1450 and 2900 rpm.

V. Installation and Maintenance
Installation Method: Equipped with a guide rail system and quick-release device for easy disassembly and maintenance without disconnecting pipelines.

Compact equipment structure, small footprint, suitable for the confined engine room environment of ships.

Maintenance Convenience: Designed with easily replaceable mechanical seals and wear parts.

Clear maintenance manual and technical support are provided for easy operation by crew.

On-site Cleanup: The pulverizing impeller and filter screen are rationally designed to reduce the possibility of sediment accumulation and clogging.

VI. Certification and After-sales Service
Classification Society Certification: The product must comply with the standards of classification societies such as CCS, ABS, and DNV GL for marine equipment to ensure safety and reliability.

Quality Assurance: We select manufacturers with mature technology and a good reputation to ensure stable product performance.

Comprehensive After-Sales Service: This includes spare parts supply, technical support, equipment training, and resolving any issues encountered during shipboard use.

VII. Typical Parameter Reference

parameter	Reference range	illustrate
flow	5-50 m³/h	Adjustments based on ship type and pollution discharge volume
water pump	5-30 m	Meet the required head of the discharge pipeline
Maximum particle diameter	20-50 mm	Influences on impeller and pump body structural design
Motor power	1.5-15 kW	Depending on the working conditions, allowance is provided.
motor speed	1450-2900 rpm	Ensure efficiency and cutting capability
Material	316L不锈钢及以上	Meets the requirements for salt water corrosion resistance
Protection level	IP68	Waterproof and dustproof, suitable for diving

VIII. Summary of Purchasing Recommendations
**Identify operating conditions and accurately calculate flow rate and head.**
**Select a submersible sewage pump specifically designed for marine use with pulverizing capabilities to ensure effective impurity handling.**
**Pay attention to the corrosion resistance of the pump body and impeller materials and the performance of the mechanical seal.**
**Select a motor with a high protection rating, featuring thermal and overload protection.**
**Aim for a compact structure, easy installation, and simple maintenance.**
**Purchase products from reputable manufacturers with classification society certification.**
**Purchase from manufacturers offering comprehensive after-sales support and technical assistance.**