Stainless Steel Pump Casing for Volute Casing Pumps

The Stainless Steel Pump Casing for Volute Casing Pumps is a high-efficiency fluid handling solution designed to convert dynamic energy into pressure energy in centrifugal pump systems. Manufactured from 304 (UNS S30400), 316L (UNS S31603), or super duplex 2507 (UNS S32750), these casings feature a spiral volute design optimized via computational fluid dynamics (CFD) to minimize turbulence and maximize hydraulic efficiency (up to 92%).

Engineered with precision-machined suction and discharge nozzles (flanged to ASME B16.5 or DIN PN16) and reinforced casings, the components meet ISO 5199 and API 610 standards for industrial process pumps, ensuring reliable operation in clear liquids, low-solids slurries, and high-temperature fluids.

This casting part is pump casing, used for volute casing pumps. It has a complicated inside structure, using the soluble core. We can meet narrow fluid passage width and critical machining accuracy requirements.

CFD-Optimized Volute Geometry: Spiraling tongue angles (8-12°) and expanding cross-sections reduce recirculation and pressure pulsations, achieving NPSH requirements 10% lower than conventional designs.

High-Temperature & Pressure Resistance: Super duplex 2507 casings withstand temperatures up to 300°C (572°F) and pressures up to 100 bar (1,450 PSI), ideal for petrochemical and power generation applications, while 316L offers cost-effective performance in moderate conditions.

Erosion-Resistant Construction: Thickened volute walls (5-10mm) and optional tungsten carbide overlays on the tongue region protect against particle erosion in fluids containing up to 5% solids (≤ 100μm diameter).

Easy Maintenance Access: Split-case designs with hinged covers allow quick inspection of impeller and seal components, while replaceable wear rings in the casing bore extend service life by 30% in abrasive environments.

The volute casing parts are the main body of a volute casing pump.

The volute casing has a spiral shape. It surrounds the pump wheel (or impeller) and directs the fluid through the pump and converts kinetic energy of the fluid into potential energy. It slows down the fluid's rate of flow, increasing pressure. The pump casing, on the other hand, protects the pump's internal parts and ensures efficient operation.

The volute casing pump has several important parts that work together for efficient fluid flow. It's a key part that helps the pump work right. This kind of pump casings are widely applied in water treatment industry, food equipment industry, petrochemical industry, and shipbuilding industry,etc

Water Supply & Distribution: Used in centrifugal pumps for municipal water treatment plants and irrigation systems, with 316L casings resisting corrosion from chlorinated water and biofilm buildup.

Petrochemical Industry: Integral to process pumps for transferring crude oil, refined fuels, and chemical intermediates, where super duplex 2507 casings withstand high-pressure hydrogen sulfide (H₂S) and chloride stress corrosion.

Power Generation: Deployed in boiler feed pumps and condenser circulating pumps, with 316H casings handling superheated water at 450°C (842°F) and 200 bar (2,900 PSI) in thermal power plants.

Mining & Metals: Forms the core of slurry pumps for mineral processing, with hardfaced volute tongues (Stellite® 6) enduring erosion from abrasive ore suspensions and ensuring consistent flow rates.

Q: How does the volute design affect pump efficiency?

A: The spiral shape smoothly accelerates fluid from the impeller to the discharge nozzle, converting velocity energy to pressure energy with minimal loss, achieving up to 5% higher efficiency than conventional volutes.

Q: Can these casings be used with non-Newtonian fluids like polymers?

A: Yes—CFD-optimized volutes handle shear-thinning fluids (viscosity up to 5,000 cP), with optional wide discharge nozzles reducing pressure drop in high-viscosity applications.

Q: What is the recommended gap between the impeller and volute tongue?

A: Standard clearance is 0.5-1.0mm for clean fluids; for slurries, this is increased to 1.5-2.0mm to prevent particle trapping and reduce wear.