INDUSTRY COMPONENT

Casing / Volute

Casing/Volute is the stationary housing in a CIP return pump that converts kinetic energy into pressure energy by gradually expanding flow area.

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Component Specifications

Definition
The casing, also known as volute, is a critical stationary component in centrifugal pumps like CIP return pumps. It's a spiral-shaped housing that surrounds the impeller and collects the fluid discharged from it. The casing's primary function is to convert the high-velocity kinetic energy from the impeller into usable pressure energy through its gradually expanding cross-sectional area. In CIP (Clean-in-Place) return pumps, it must withstand aggressive cleaning chemicals, temperature variations, and maintain hygienic standards.
Working Principle
The volute casing operates on the conservation of angular momentum principle. As fluid leaves the impeller at high velocity, it enters the volute's gradually expanding spiral passage. This expansion reduces fluid velocity while increasing static pressure according to Bernoulli's principle. The design ensures uniform pressure distribution around the impeller, minimizing radial loads and improving pump efficiency.
Materials
Typically 316L stainless steel (ASTM A240/A276) for CIP applications, with surface finish Ra ≤ 0.8 μm. Alternative materials include duplex stainless steels (2205) for higher corrosion resistance or cast iron with protective coatings for non-critical applications.
Technical Parameters
  • Volute Type Single volute (standard), Double volute (for high-pressure applications)
  • Surface Finish Ra ≤ 0.8 μm (electropolished optional)
  • Pressure Rating Up to 16 bar
  • Connection Types Flanged (ANSI/ASME B16.5), Clamp (3A/SMS)
  • Design Standards ASME B73.1, ISO 2858
  • Temperature Range -20°C to 140°C
Standards
ISO 5199, ASME B73.1, 3A 00-10, EHEDG

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Casing / Volute.

pump casing volute housing CIP pump components centrifugal pump parts stainless steel volute industrial pump housing Casing / Volute Casing / Volute in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

CIP Return Pump

A specialized pump designed to return cleaning solutions from the CIP system back to the central storage or drain after the cleaning cycle.

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Backwash Pump

A pump specifically designed to provide high-pressure water flow for cleaning and regenerating filtration media in backwash systems.

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Supply Pump

A mechanical device that moves water through a water supply system by creating pressure differentials.

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Engineering Analysis

Risks & Mitigation
  • Corrosion from aggressive CIP chemicals
  • Erosion from abrasive particles in fluid
  • Cavitation damage
  • Thermal stress from temperature cycling
  • Microbial growth in surface imperfections
FMEA Triads
Trigger: Chemical attack from chlorine-based sanitizers
Failure: Pitting corrosion leading to leaks
Mitigation: Use 316L or super duplex stainless steel; implement proper passivation; monitor chemical concentrations
Trigger: Solid particle erosion
Failure: Thinning of volute walls, efficiency loss
Mitigation: Install inlet strainers; use hardened materials; implement regular thickness inspections
Trigger: Improper installation alignment
Failure: Asymmetric wear, vibration, seal failure
Mitigation: Follow precise alignment procedures; use laser alignment tools; implement vibration monitoring

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances per ISO 2768-m, concentricity within 0.1mm TIR, surface roughness Ra ≤ 0.8 μm
Test Method
Hydrostatic test at 1.5x design pressure per ASME B73.1, dye penetrant inspection for defects, dimensional verification with CMM

Buyer Feedback

★★★★☆ 4.6 / 5.0 (9 reviews)

"Testing the Casing / Volute now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Casing / Volute meets all ISO standards."

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Frequently Asked Questions

Why is 316L stainless steel preferred for CIP pump casings?

316L stainless steel offers excellent corrosion resistance against CIP cleaning chemicals (acids, caustics, sanitizers), has low carbon content to prevent sensitization during welding, and meets food/pharmaceutical hygiene standards.

What's the difference between single and double volute designs?

Single volute has one discharge channel and is cost-effective for standard applications. Double volute has two discharge channels 180° apart, which balances radial loads on the impeller shaft, reducing vibration and wear in high-pressure applications.

How does casing wear affect pump performance?

Casing wear increases clearance between impeller and volute, reducing efficiency through increased recirculation and pressure loss. Severe wear can cause vibration, noise, and premature bearing failure.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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