Sewage Pump CSW

Submersible sewage pump rated for solids up to 100 mm and specific gravity 1.7. Available from 2 HP to 200 HP for residential lift stations through municipal STP inlet pumping stations. ISO & CE certified manufacturer in Faridabad, India.

Residential, commercial, and municipal sewage contains solid matter — rags, paper, sanitary waste, and coarse organic debris — at concentrations and particle sizes that fail standard dewatering pumps within hours. The specific gravity of raw sewage runs between 1.05 and 1.2 at a residential lift station, but can reach SG 1.7 at a municipal wet well handling mixed influent. A pump specified without this margin fails prematurely.

The Cosmos CSW Sewage Submersible Pump is purpose-built for this environment. Handling solids from 20 mm to 100 mm, rated to SG 1.7, and available from 2 HP to 200 HP, the CSW range covers every sewage pumping duty from a 50-unit residential sump to a 100+ MLD municipal STP inlet pumping station. Rival submersible sewage pump manufacturers in India commonly offer ranges up to 25 HP handling solids to 50 mm — the CSW range goes significantly beyond.

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CSW Technical Specifications

Available configurations: Low-head, medium-head, and high-head variants across the HP range. Discharge sizes from 50 mm to 400 mm depending on duty point.

What Sets the CSW Apart — Engineering Highlights

F-Class insulation with integrated thermal sensor

Standard dewatering motors run Class H insulation (180°C) because they operate intermittently. Sewage pumps are often installed on auto-level controls and cycle frequently in municipal duty. The CSW uses F-Class insulation (155°C) rated for frequent start-stop cycling, with an embedded thermal sensor that trips the motor before winding temperature causes insulation failure. Optional H-class is available for extreme-duty installations.

Dual TC vs TC mechanical seal with oil seal

Sewage environments contain abrasive grit that destroys single-seal configurations over months of operation. The CSW uses dual tungsten-carbide vs tungsten-carbide (TC vs TC) mechanical seals backed by an oil seal — the same seal configuration used in Cosmos’s slurry pump range. This is the standard that municipal specification engineers request when writing pump BOQs for 10+ year installation contracts.

Angular/Radial/Tapper ball bearings with high-temperature grease

Bearing failure is the leading cause of sewage pump downtime in municipal installations. The CSW uses a combined angular, radial, and taper roller bearing arrangement, packed with high-temperature grease. This resists the radial and axial loads from large-solid handling and extends bearing life in 24/7 duty installations.

SS410 high-torsional-strength shaft

Large solids passing through the impeller exert shock torque loads on the shaft during each passage. The CSW shaft is SS410 — the same grade used in Cosmos CDW high-head dewatering pumps — specifically chosen for torsional strength, not just corrosion resistance.

SS316 lifting hook

Standard lifting lugs on cast iron pump bodies corrode in sewage environments. The CSW provides a dedicated SS316 stainless steel lifting hook rated for the full pump weight, enabling safe crane or chain-block extraction from wet well installations without the risk of lifting eye failure.

100+ sewage pump deployments per year

Cosmos Pumps manages a rental fleet handling 100+ sewage pumps across 200+ pump-deployments annually in municipal sewage rehab, STP bypass, and emergency sewage diversion projects across North India. The CSW series design refinements reflect two years of field data from this operational base.

Applications — Where the CSW Operates

Municipal Wet Wells and Pumping Stations

Municipal sewage pumping stations typically specify duty-standby pairs from 15 HP to 200 HP, pumping through 80–300 m of rising main to the STP headworks. The CSW range covers this entire HP band. At 33,000 LPM maximum flow capacity, a pair of 200 HP CSW units can serve inlet pumping stations handling 40–50 MLD of influent.

Flow variation across the diurnal cycle is the core challenge in municipal pumping. The CSW’s performance curve provides stable operation across a wide flow range without surging, making it suitable for level-controlled auto-start installations where the inflow rate fluctuates between 20% and 100% of peak flow.

Sewage Treatment Plants (STP) and Effluent Treatment Plants (ETP)

STP applications include inlet lift, sludge recirculation, digested sludge transfer, and scum pumping. Each duty has different solid-size and SG requirements. The CSW 20–100 mm solids range covers inlet lift (large solids, SG 1.05–1.2), and with the SG 1.7 rating can handle partially digested sludge recirculation duties where other sewage pumps fail.

ETP applications in textile, food processing, and pharmaceutical industries introduce both chemical effluent (pH variation) and high-solids loads. The CSW’s robust mechanical seal and SS410 shaft handle moderate chemical exposure where more aggressive chemical dosing is applied upstream.

Residential and Commercial Complexes

Multi-storey residential complexes and commercial towers in Indian cities generate sewage at volumes that require dedicated 2–15 HP sewage lift stations at basement or underground sump level. The CSW range starts at 2 HP — sized for a 50-unit residential complex — and scales through 15 HP for a large township lift station serving 500+ apartments.

Key specification requirement for residential installations: the pump must pass solids reliably without requiring regular manual attention. The CSW 20–100 mm solids handling means the pump clears sanitary waste, paper, and wet wipes without requiring a maintenance visit for every blockage event.

Industrial Complexes and Sewage Bypass

Industrial estates, food processing plants, and pharmaceutical manufacturing facilities generate process effluent mixed with domestic sewage that requires pumping to a central ETP or municipal sewer. The CSW’s SG 1.7 rating provides margin for denser effluent streams that exceed the SG 1.2 limit of standard sewage pumps.

Sewage bypass pumping during STP maintenance shutdowns requires portable sewage pump deployment. The CSW’s lifting hook and modular construction support rapid deployment from a hired unit to a temporary bypass sump with guide rail alignment, reducing bypass setup time.

CSW vs CNC: Which Submersible Pump for Your Application?

The CSW and CNC are both sewage-capable submersible pumps from Cosmos, but they serve different duty profiles. Specifying the wrong pump for the duty results in either early failure (underspec) or unnecessary cost (overspec).

Choose the CSW when: you are specifying a permanent sewage lift station, a municipal pumping station wet well, or an STP inlet duty where pump HP exceeds 6 HP and flow rates exceed 1,500 LPM.

Choose the CNC when: you need portable sewage bypass capability at a manhole, construction site temporary sump, or short-duration diversion duty where the pump must be repositioned frequently.

Auto-Coupling and Guide Rail Installations

Municipal and commercial sewage pump installations are typically specified with an auto-coupling system — a guide rail and baseplate arrangement that allows the pump to be lowered into the wet well and mate with the discharge connection automatically, without a diver or manual bolting in the wet well.

The CSW is compatible with standard auto-coupling systems used in Indian municipal pump specifications. Cosmos supplies the pump; the guide rail, baseplate, and discharge elbow can be matched to the project’s civil design. This is particularly important for retrofits into existing wet wells where the guide rail system is already fixed.

For new STP pump installations, Cosmos Pumps can provide EPEC (Engineering, Procurement, Execution, Commissioning) services — supplying pumps, panels, guide rails, and commissioning under a single contract. This eliminates interface risk between pump supplier and electrical panel vendor.

CosmoSmart IoT Monitoring Integration

Municipal sewage pumping stations are remote assets. When a pump trips at 3 AM and the level rises unchecked, the wet well overflows — a compliance incident and a health hazard. The Cosmos CosmoSmart™ IoT system prevents this scenario.

CosmoSmart connects to the CSW’s control panel via a sensor node and transmits real-time operating data to the site manager’s mobile app:

• Live pump running / trip / alarm status
• Real-time motor temperature (from the CSW’s integrated thermal sensor)
• Historical run-hours and trip log (6-month archive)
• Service alerts triggered by run-hour thresholds

CosmoSmart integration is available across the CSW range. It is particularly specified by municipal corporations and private STP operators managing multiple pumping stations from a single control room, and by EPC contractors who offer O&M contracts post-commissioning.

Frequently Asked Questions

What is a sewage pump and how is it different from a dewatering pump?

A sewage pump is a submersible pump specifically engineered to handle sewage — raw domestic or municipal wastewater containing large organic solids (up to 100 mm), paper, fibrous material, and a specific gravity typically between 1.05 and 1.7. A standard dewatering pump handles dirty groundwater and construction runoff with small suspended solids (typically 4–12 mm) and a specific gravity near 1.0. Specifying a dewatering pump in a sewage lift station will result in rapid impeller wear and frequent blockage.

What HP sewage pump do I need for a residential complex?

For a residential complex of 50–100 apartments, a 2–5 HP CSW is typically sufficient. For 100–300 apartments with a basement sump, 7.5–15 HP is the normal range. Municipal lift stations for 1,000+ equivalent population typically run 25–100 HP duty-standby pairs. Cosmos Pumps can size the CSW correctly for your head, flow, and population equivalent — contact us with your sump dimensions and peak flow requirement.

Can the CSW handle the solids found in Indian municipal sewage?

Yes. Indian municipal sewage frequently contains plastic bags, rags, and sanitary waste items that can reach 80–100 mm in aggregate size. The CSW handles solids from 20 mm to 100 mm in diameter. This range is significantly wider than most competing sewage pump ranges available in India, which typically cap at 50 mm. The 100 mm rating was established through testing and field deployment across 100+ Cosmos sewage pump rental projects in municipal rehabilitation work.

What is the difference between F-class and H-class motor insulation in sewage pumps?

F-class insulation is rated to 155°C and is optimised for frequent start-stop cycling — the duty profile of a level-controlled sewage pump in a residential or municipal lift station. H-class insulation (180°C) tolerates higher peak temperatures but is better suited to continuous-run or high-ambient-temperature dewatering applications. The CSW uses F-class as standard with optional H-class upgrade, ensuring the motor is correctly matched to sewage pumping duty rather than being over-specified for dewatering applications.

What does SG 1.7 mean and why does it matter for sewage pump selection?

SG (specific gravity) is the ratio of the fluid’s density to water. Clean water = SG 1.0. Raw municipal sewage = SG 1.05–1.2. Partially digested sludge or heavily loaded industrial effluent can reach SG 1.4–1.7. A pump rated only to SG 1.2 will be overloaded and trip repeatedly when handling heavier effluent, while a pump rated to SG 1.7 operates within its design envelope. The CSW’s SG 1.7 rating provides the margin required for STP sludge recirculation duties that many sewage pumps cannot handle.

Can the CSW be used for sewage bypass pumping during STP shutdowns?

Yes. The CSW can be deployed in a portable bypass configuration with a temporary sump. However, for frequent repositioning across multiple bypass sites, the CNC non-clog pump (up to 20 HP, 1,500 LPM) is more suitable due to its lighter weight and bottom discharge configuration. For large-volume bypass (>1,500 LPM) or high-head bypass (>30 M), the CSW is the correct choice.

Does Cosmos supply sewage pumps on rental?

Yes. Cosmos Pumps operates a rental fleet that handles 100+ sewage pump deployments per year across municipal sewage rehabilitation, STP bypass, and emergency sewage diversion projects in North India. Rental is available for short-term bypass duties, seasonal sewage rehabilitation contracts, and emergency STP diversion situations. Contact us for rental availability and pricing.

What is an auto-coupling system and does the CSW support it?

An auto-coupling (also called a dry installation system or guide rail system) is a mounting arrangement where the pump slides down a guide rail into the wet well and automatically mates with the discharge elbow at the bottom — without requiring a person to enter the wet well or bolt the discharge connection manually. The CSW is compatible with standard auto-coupling baseplates and guide rail systems used in Indian municipal pump specifications.

Does the CSW come with CosmoSmart IoT monitoring?

CosmoSmart IoT monitoring is available as an optional add-on for CSW installations. It provides real-time pump status, motor temperature, trip alarms, and run-hour data via a mobile app. It is commonly specified by municipal corporations and EPC contractors who manage multiple pumping stations remotely or offer O&M contracts post-commissioning.

Request a Quote — CSW Sewage Submersible Pump

Cosmos Pumps is an ISO & CE certified manufacturer of sewage submersible pumps based in Faridabad, NCR. We supply the CSW series to municipal corporations, EPC contractors, STP/ETP operators, and residential developers across India and internationally (UAE, Qatar, Saudi Arabia, Kuwait, Nigeria, and others).

To receive a pump selection and quotation, contact us with:

• Required flow rate (LPM or m³/h)
• Required head (M)
• Solid size and specific gravity of the fluid
• Installation type (permanent wet well, temporary bypass, or auto-coupling)
• Power supply (voltage, phase)

WhatsApp +91 99333 22238 Email: cosmos@cosmospumps.com

Download CSW Catalogue