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COS Series BB1 type is a horizontal, single-stage, axially split, between-bearings centrifugal pump designed in full compliance with API 610 12th Edition.
The pump casing is split axially at the shaft centerline, which allows easy maintenance and overhaul without disconnecting the driver, coupling, or process piping. It adopts a double-suction impeller structure, providing low NPSH required, high hydraulic efficiency, and small axial thrust.
Features
1. The axially split design allows easy removal of the top casing and access to the pump components (bearings, wear rings, impeller, and shaft seal) without disturbing the motor or pipe work.
2. The independent bearing housing allows for ease of maintenance without removing the top casing. The double volute design reduces the radial load on the shaft, extending component life, minimizing vibration and providing quiet operation.
3. The pump also offers high efficiency throughout the range. High energy efficiency along with long pump working life and easy maintenance add up to low life-cycle costs.
4. The split case pump is available with a liquid cooled sleeve bearing which promotes longer life and reduces maintenance.
Parameters
Flow Capacity: 50 - 20,000 m3/h
Delivery Head: 7-220m
Outlet Diameter: 80-1,600mm
Working Pressure: ≤ 2.5Mpa
Liquid Temp.: 0℃-80℃
Applications
General residential & industrial water supply & transferring; Agricultural irrigation & drainage, Flood discharge & Emergency drainage; Civil water treatment, Waterworks, Sea water desalination; Air-conditioning, Fire-fighting facilities, High building water supply; Oil & Gas & Chemical processing, Abrasive liquids transferring; Power plant water circulation, Cooling tower & Hot water transferring Mining, Boiler feeding, etc.
Main Parts Configuration （API610 standards）
The pump could be applied to transfer different kinds of liquid by customized wet parts, here followed our recommendation of main configuration:
| Material Grade | Casing (Body) | Impeller | Shaft | Shaft Sleeve / Wear Ring | Casing Wear Ring | Throat Bushing | Fasteners (Stud/Nut) | Typical Application |
|---|---|---|---|---|---|---|---|---|
| S‑6 | ASTM A216 Gr WCB | ASTM A743 Gr CA6NM | A276 410 SS (HT) | A276 410 SS (HT) | A276 410 SS (HT) | A276 410 SS (HT) | A193 B7 / A194 2H | General clean water, light hydrocarbons, non‑corrosive services |
| A‑8 | ASTM A351 Gr CF8M | ASTM A351 Gr CF8M | A479 XM‑19 / 316 | 316 SS | 316 SS | 316 SS | A193 B8M / A194 8M | Mild corrosion, water, mild chemicals, low‑chloride services |
| C‑6 | ASTM A487 Gr CA6NM | ASTM A743 Gr CA6NM | A276 420 SS (HT) | A276 420 SS (HT) | A276 420 SS (HT) | A276 420 SS (HT) | A193 B7 / A194 2H | Moderate erosion, high‑temperature water, slightly corrosive services |
| D‑1 | ASTM A890 Gr 4A | ASTM A890 Gr 4A | A479 XM‑19 | Duplex SS | Duplex SS | Duplex SS | A193 B8M / A194 8M | High chloride, seawater, sour services, moderate corrosion |
| D‑2 | ASTM A890 Gr 5A | ASTM A890 Gr 5A | A479 XM‑19 | Super Duplex SS | Super Duplex SS | Super Duplex SS | A193 B8M / A194 8M | Severe corrosion, high chloride, harsh chemical services |
| S‑8 | ASTM A216 Gr WCB | ASTM A351 Gr CF8M | A276 410 SS (HT) | 316 SS | 316 SS | 316 SS | A193 B7 / A194 2H | Carbon steel body with stainless internals for mild corrosion |
