INDUSTRY COMPONENT

Casing Body

The casing body is the main structural housing of a volute casing that contains and directs fluid flow in centrifugal pumps and compressors.

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Component Specifications

Definition
A casing body is the primary structural component of a volute casing assembly in centrifugal fluid machinery. It serves as the outer shell that encloses the impeller, diffuser, and other internal components while forming the spiral-shaped volute chamber. This chamber converts kinetic energy from the rotating impeller into pressure energy by gradually increasing cross-sectional area along the flow path. The casing body provides mechanical support, maintains alignment of internal components, withstands operational pressures, and interfaces with piping systems through inlet and outlet connections.
Working Principle
The casing body operates on the volute principle where fluid enters axially, is accelerated radially by the impeller, then flows into an expanding spiral chamber. This expansion reduces velocity while increasing static pressure according to Bernoulli's principle. The casing body maintains this pressure conversion by providing a continuously expanding flow path with minimal turbulence and energy losses.
Materials
Typically cast iron (ASTM A48), ductile iron (ASTM A536), cast steel (ASTM A216 WCB), stainless steel (ASTM A743 CF8M), or engineered polymers for specific applications. Material selection depends on pressure rating, fluid compatibility, temperature range, and corrosion resistance requirements.
Technical Parameters
  • Flatness 0.1 mm per 100 mm
  • Surface Finish Ra 3.2 μm internal, Ra 6.3 μm external
  • Pressure Rating Up to 25 bar standard, 40+ bar for high-pressure designs
  • Connection Types Flanged (ANSI/ASME B16.5), threaded, or welded
  • Temperature Range -20°C to +200°C standard
  • Dimensional Tolerance IT8-IT10 per ISO 286
Standards
ISO 5199, ISO 9905, ASME B73.1, DIN 24255

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Casing Body.

casing body volute casing pump housing compressor casing centrifugal pump components fluid machinery housing Casing Body in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Volute Casing

The spiral-shaped housing of a centrifugal pump that converts kinetic energy from the impeller into pressure energy.

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Engineering Analysis

Risks & Mitigation
  • Cavitation damage
  • Corrosion failure
  • Thermal stress cracking
  • Mechanical fatigue
  • Gasket/seal leakage
FMEA Triads
Trigger: Improper material selection for fluid service
Failure: Rapid corrosion leading to wall thinning and rupture
Mitigation: Implement material compatibility testing and follow ASTM/ISO material selection guidelines
Trigger: Inadequate pressure relief protection
Failure: Overpressure deformation or catastrophic rupture
Mitigation: Install pressure relief valves and conduct regular pressure testing per ASME BPVC
Trigger: Poor casting quality or defects
Failure: Crack propagation from casting porosity or inclusions
Mitigation: Implement radiographic testing (RT) and ultrasonic testing (UT) during manufacturing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances per ISO 2768-m, pressure containment per ASME Section VIII, surface finish per ISO 1302
Test Method
Hydrostatic pressure testing at 1.5x design pressure, non-destructive testing (NDT) including dye penetrant and ultrasonic inspection, dimensional verification using CMM

Buyer Feedback

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"Great transparency on the Casing Body components. Essential for our Machinery and Equipment Manufacturing supply chain."

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Frequently Asked Questions

What is the main function of a casing body in a volute casing?

The casing body provides structural integrity, contains internal components, forms the pressure conversion chamber, and directs fluid flow with minimal energy loss.

How does material selection affect casing body performance?

Material determines pressure capacity, corrosion resistance, temperature tolerance, and compatibility with different fluids, directly impacting service life and maintenance requirements.

What are common failure modes for casing bodies?

Erosion from abrasive fluids, corrosion from chemical exposure, cracking from thermal stress or pressure cycling, and deformation from overpressure conditions.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Casing / Volute Casing/Frame