A submersible sewage pump is an electric motor and pump unit designed to be fully immersed in the liquid being pumped, eliminating the need for suction pipes or external priming. The Cosmos CSW sewage submersible pump handles 775–33,000 LPM at heads from 5 M to 60 M, managing solids up to 100 mm in diameter at specific gravities up to 1.7 — for municipal lift stations, STP inlets, and industrial wastewater.
CSW Series — Quick Specification Reference:
| Parameter | Range / Spec |
|---|---|
| Flow Rate | 775 – 33,000 LPM |
| Head Range | 5 M – 60 M |
| HP Range | 2 – 200 HP |
| Max Solids Diameter | 100 mm |
| Specific Gravity | Up to 1.7 |
| Shaft Material | SS410 (high torsional strength) |
| Seal Type | Dual TC vs TC mechanical seal + oil seal |
| Insulation Class | F-class (155°C) with thermal sensor |
| Lifting Hook | SS316 |
Available with optional H-class insulation and moisture/temperature sensor.
Cosmos Pumps’ CSW range is an ISO- and CE-certified submersible sewage pump engineered for the hardest wastewater and sewage applications — from municipal lifting stations and STP bypass to large residential complexes and industrial effluent sumps. The CSW handles solids up to 100 mm in diameter at specific gravities up to 1.7, and scales from 2 HP to 200 HP in a single product family.
Quick Specs:
| Parameter | CSW Range |
|---|---|
| Shut-off Head | 5 M – 60 M |
| Flow Rate | 775 – 33,000 LPM |
| HP Range | 2 – 200 HP |
| Max Solids Size | 20 – 100 mm |
| Max Specific Gravity (SG) | 1.7 |
| Insulation Class | F-class (155°C), H-class optional |
| Motor Seal | Dual TC vs TC mechanical seal + oil seal |
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Sewage contains rags, wipes, fibrous material, and solid debris. The CSW’s open-channel or semi-open impeller (SS or CI), combined with bottom-discharge hydraulics, passes solids up to 100 mm without choking — eliminating the operator call-outs and manual de-ragging that plague standard submersible pumps on sewage duty.
Municipal sewage lifting stations run 8,000+ hours per year. The CSW uses Angular, Radial, and Tapper ball bearings with high-temperature grease — chosen specifically for continuous-duty, high-thermal-load applications. Combined with F-class insulation (rated to 155°C) and an integrated thermal sensor, the motor is protected against overheating even at peak summer load.
Sewage is corrosive and abrasive. The CSW shaft is forged from SS410 high-torsional-strength stainless steel, and the shaft seal system uses dual TC vs TC (tungsten carbide on tungsten carbide) mechanical seals plus a secondary oil seal — creating two independent barriers against sewage infiltration into the motor.
Wet wells and underground pump stations require reliable lifting hardware. The CSW ships with a SS316 stainless steel lifting hook as standard, rated for the full pump weight, making wet-well installation and periodic withdrawal safe and straightforward.
For unmanned pump stations and CosmoSmart™-connected installations, the CSW can be specified with moisture and temperature sensors in the motor housing. These sensors integrate directly with the CosmoSmart IoT platform for real-time remote alerts, protecting the motor from catastrophic seal failure before it becomes a failure event.
The CSW range covers the full spectrum of sewage and wastewater pumping duty:
Choosing between the CSW and CSL often confuses specifiers. Use this table:
| Feature | CSW — Sewage Pump | CSL — Slurry Pump |
|---|---|---|
| Primary medium | Sewage / wastewater | Slurry (heavy solids suspension) |
| Max solids size | 100 mm (fibrous solids OK) | 70 mm |
| Max SG | 1.7 | 2.1 |
| Material of construction | SS410 shaft, SS/CI impeller | 27% Hi-Chrome (HRC 60+) |
| Best for | STP, municipal lifting stations, building sewage | Ash transfer, mine waste, harbour dredging, coal runoff |
| HP range | 2 – 200 HP | Up to 100 HP |
Rule of thumb: If you are pumping sewage, black water, or effluent — choose CSW. If your medium carries heavy abrasive solids (ash, sand, ore concentrate) at SG above 1.7 — choose the CSL slurry pump.
| Model | Flow Rate (LPM) | Head (M) | Power (HP) | Solids (mm) | SG |
|---|---|---|---|---|---|
| CSW 2″ | 775 – 1,200 | 5 – 18 | 2 – 3 | 20 | 1.3 |
| CSW 3″ | 1,500 – 3,000 | 8 – 25 | 5 – 10 | 40 | 1.5 |
| CSW 4″ | 3,000 – 8,000 | 10 – 35 | 10 – 30 | 60 | 1.6 |
| CSW 6″ | 8,000 – 18,000 | 15 – 45 | 30 – 75 | 80 | 1.7 |
| CSW 8″+ | 18,000 – 33,000 | 20 – 60 | 75 – 200 | 100 | 1.7 |
Full model-specific curves and dimensional drawings available in the Cosmos CSW catalogue. Download here.
Construction Details:
For permanent pump station installations, the CSW is available with an auto-coupling system (also called guide-rail or drop-pipe installation). The pump slides down dual guide rails and locks onto a flanged discharge elbow at the sump base — no bolts, no confined-space entry required for pump change-out. This is the industry-standard configuration for:
Specify “CSW-AC” when ordering for auto-coupling compatibility.
Unmanned sewage pump stations are a liability risk. The Cosmos CSW pairs natively with the CosmoSmart™ IoT monitoring system, giving operators:
For municipal corporations and large STP operators managing multiple pump stations across a city, CosmoSmart converts reactive maintenance into predictive maintenance — significantly reducing unplanned emergency call-outs in Cosmos-installed and monitored sites. [VERIFY: Please confirm a specific reduction figure before we publish this claim, or we will remove the specific claim and keep only the generic statement above.]
Cosmos Pumps has supplied and commissioned sewage pumping equipment on 200+ projects per year. A representative municipal rehab programme in North India involved:
Project data is indicative of Cosmos’s municipal programme scale. Detailed case study references available on request. [VERIFY: If you have a named project or client to reference here, share the details and we will update before publishing.]
Manufacturer Advantage
Cosmos designs, manufactures, and tests all CSW pumps at our 25,000 sq. ft. ISO-certified facility in Faridabad, Haryana. No intermediary, no import lead time — spare parts are available ex-stock within 24 hours for NCR, and within 48–72 hours nationally.
Application Engineering
Our application engineers review every sewage pump enquiry for solids type, peak flow, duty cycle, and pump station layout before proposing a model and HP. You get a pump specified for your actual application, not a catalogue selection.
Service Network
Cosmos operates a service workshop in Faridabad and supports preventive maintenance contracts (AMC) across India. For critical STP and municipal applications, we offer O&M contracts with guaranteed response SLAs.
Track Record
What is a sewage pump?
A sewage pump is a submersible or self-priming pump designed to transfer raw sewage containing solids (fibrous material, human waste, wipes) from a collection sump to a treatment facility or higher elevation point. Unlike clean-water pumps, sewage pumps have large-passage impellers and robust seals to handle solid matter without clogging.
What size sewage pump do I need?
Sewage pump sizing depends on peak flow rate (LPM or m³/h), total head (static lift + pipe friction losses), and the solids content of the sewage. As a starting guide: residential complexes typically require 2–15 HP; municipal lifting stations range from 10 HP to 200 HP or higher. Cosmos engineers can size your pump from basic project data — contact us with your flow requirement and head.
Can a sewage pump handle solids?
Yes. The Cosmos CSW is specifically designed to handle solids up to 100 mm in diameter. The open or semi-open impeller geometry and bottom-discharge configuration allow fibrous solids and debris to pass without wrapping or choking. Standard clean-water submersible pumps should never be used for raw sewage.
What is the difference between a sewage pump and a sludge pump?
A sewage pump handles dilute wastewater with solid matter (typical SG 1.0–1.3). A sludge pump handles thicker, higher-SG sludge from ETP/STP digestion tanks or drilling operations (SG up to 1.5+). Cosmos offers both: CSW for sewage duty, and CNC/CSL for heavier sludge and slurry applications.
What is the difference between a sewage pump and a slurry pump?
Sewage pumps (CSW) target wastewater and sewage with SG up to 1.7 and solids up to 100 mm. Slurry pumps (CSL) target heavily abrasive mixtures — coal ash, mine tailings, sand — with SG up to 2.1 and demand 27% hi-chrome metallurgy to resist extreme abrasion. See the CSW vs CSL comparison table above.
Does Cosmos offer sewage pump rental?
Cosmos operates one of India’s largest dewatering and sewage pump rental fleets — 500+ submersible pumps available for short-term hire for STP bypass, sewage diversion during civil works, or flood emergencies. View rental options.
What is an auto-coupling sewage pump?
An auto-coupling (guide-rail) system allows the sewage pump to be installed and retrieved without confined-space entry. The pump slides on two guide rails and self-docks onto a flanged discharge bend at the sump floor. This is the standard specification for permanent municipal pump stations and is available on all CSW models as the CSW-AC option.
What warranty and after-sales support does Cosmos offer?
All Cosmos CSW pumps carry a standard 12-month warranty from commissioning. After-sales services include spare parts (ex-stock in Faridabad), preventive maintenance contracts (AMC), and O&M contracts for critical municipal and STP installations. Contact us to discuss your maintenance requirement.
Ready to specify a CSW sewage pump for your project? Share these details with our team:
Call: +91 99333 22238
Email: cosmos@cosmospumps.com
WhatsApp: +91 99333 22238
Download CSW Catalogue
Slurry Pump (CSL) · Sludge Pump · Non-Clog Pump (CNC) · Submersible Pumps · Dewatering Pump Rental