Casing Body: Flatness 0.1 mm per 100 mm

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

Parameter	Typical range	Notes & selection driver
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

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, ISO 9905, ASME B73.1, DIN 24255

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

Typical Suppliers & Equivalents

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

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

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Manufacturers of Casing Body

Manufacturer profiles associated with Casing Body.

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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.

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.

Casing Body