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.

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
ParameterTypical rangeNotes & selection driver
Volute TypeSingle volute (standard), Double volute (for high-pressure applications)
Surface FinishRa ≤ 0.8 μm (electropolished optional)
Pressure RatingUp to 16 bar
Connection TypesFlanged (ANSI/ASME B16.5), Clamp (3A/SMS)
Design StandardsASME B73.1, ISO 2858
Temperature Range-20°C to 140°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 5199, ASME B73.1, 3A 00-10, EHEDG

Parent Products

This component is used in the following industrial products

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Casing / Volute

Manufacturer profiles associated with Casing / Volute.

Sourcing Casing / Volute from China?
Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.
Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

Upper Tool (Punch)
Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.
Main Frame
The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.
Shaft Bearing
Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.
Seal Groove
Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Request Manufacturing Insight for Casing / Volute

Thank you. Your request has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at contact@cnfx.com.
Cartridge Body Casing/Frame
Get QuotesChat