Turbine Casing: Component Overview and Specifications

Product Specifications

Technical details and manufacturing context for Turbine Casing

Definition

The turbine casing is a critical structural component of the turbine or expander section. It serves as the outer housing that encloses and protects the turbine rotor and blades, containing the high-pressure, high-temperature working fluid. The casing maintains pressure differentials across the turbine stages, supports internal components such as bearings and seals, and provides mounting interfaces for auxiliary systems like lubrication and cooling. It is designed to withstand internal pressure from the working fluid (steam, gas, etc.) while maintaining structural integrity. The casing directs the fluid flow through the turbine stages, containing the energy conversion process, and often incorporates cooling channels or insulation to manage thermal stresses. Materials commonly used include alloy steel, nickel-based superalloys, and cast iron, with specific grades such as QT400-18 (ductile iron) for pressure-retaining parts. Key parameters include operating pressure (1.0–1.6 MPa), operating temperature (-20–120°C), inlet diameter (100–600 mm), wall thickness (8–25 mm), surface roughness (Ra 3.2–6.3 μm), dimensional tolerance (±0.5 mm), weight (50–500 kg), leakage rate (≤0.05 MPa·m³/s), and corrosion resistance (≥72 h salt spray). These values are reference ranges and must be confirmed for the actual model and application. Standards such as GB/T 1348, ISO 1302, ISO 2768-m, and ASTM B117 are referenced for verification. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The turbine casing operates by withstanding the internal pressure generated by the working fluid, which may be steam, gas, or another medium. It maintains structural integrity under high pressure and temperature, preventing deformation or rupture. The casing directs the fluid flow through the turbine stages, ensuring efficient energy conversion. It contains the high-pressure fluid, preventing leaks, and supports internal components. To manage thermal stresses, the casing may incorporate cooling channels or insulation. The design must account for pressure differentials, thermal expansion, and mechanical loads. Proper material selection and wall thickness are critical to ensure safe operation. The casing also provides mounting points for auxiliary systems, such as lubrication and cooling, and must maintain sealing surfaces to prevent leakage. Regular inspection is necessary to detect wear, corrosion, or cracking, which could compromise performance and safety.

Common Materials

Alloy Steel, Nickel-based Superalloys, Cast Iron

Technical Parameters

Parameter	Typical range	Notes & selection driver
Material Grade	QT400-18	Ductile iron for pressure retaining partsGB/T 1348
Operating Temperature	-20–120 °C	Exceeding 120°C may degrade sealing
Inlet Diameter	100–600 mm	Custom sizes available
Wall Thickness	8–25 mm	Minimum per pressure rating
Surface Roughness	Ra 3.2–6.3 μm	Critical for sealing surfacesISO 1302
Dimensional Tolerance	±0.5 mm	Tighter on mating facesISO 2768-m
Weight	50–500 kg	Depends on size and material
Leakage Rate	≤0.05 MPa·m³/s	At rated pressure
Corrosion Resistance	≥72 h	Salt spray testASTM B117

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

Components / BOM

Casing Body
The casing itself: encloses and locates the internal parts and takes the operating loads.
Flange Part
Provides sealing and bolted connection points between casing sections or to external piping.

Material: Alloy Steel
Nozzle Ring
Directs and accelerates the working fluid onto the turbine blades.

Material: Heat-resistant Alloy
Support Feet Part
Anchors the casing to the foundation or support structure.

Material: Carbon Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Turbine Casing.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Turbine/Expander Section

View system integration details

Manufacturers of Turbine Casing

Manufacturer profiles associated with Turbine Casing.

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Frequently Asked Questions

What is the primary function of a turbine casing?

The turbine casing encloses and protects the rotor and blades, contains the high-pressure working fluid, maintains pressure differentials, and supports internal components. It also provides mounting interfaces for auxiliary systems.

What materials are commonly used for turbine casings?

Common materials include alloy steel, nickel-based superalloys, and cast iron. A specific grade mentioned is QT400-18 ductile iron for pressure-retaining parts, per GB/T 1348.

What are typical operating pressure and temperature ranges?

The operating pressure range is 1.0–1.6 MPa, and the operating temperature range is -20–120°C. These are reference values and must be confirmed for the specific model.

How should I verify the specifications of a turbine casing?

Always check the model-specific values and standards with the legal manufacturer or supplier. Standards such as ISO 1302 and ASTM B117 may be referenced for verification.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 250 bar (design dependent)
flow rate:	Varies with turbine design, typically 10-500 kg/s for industrial applications
temperature:	-50°C to 650°C (dependent on material grade)
slurry concentration:	Not applicable - designed for clean gas/steam service

Turbine Casing

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards