Editorial Technical Reference

Catalyst Canning / Housing

This page explains how Catalyst Canning / Housing is classified within Motor Vehicle Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The protective metal enclosure that contains and supports the SCR catalyst substrate within the exhaust system.

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Product Specifications

Technical details and manufacturing context for Catalyst Canning / Housing

Definition
The catalyst canning or housing is a critical structural component in Selective Catalytic Reduction (SCR) systems. It provides mechanical protection, thermal insulation, and secure mounting for the catalyst substrate. The housing ensures proper exhaust gas flow through the catalyst while protecting it from physical damage, vibration, and environmental factors. It is typically made of stainless steel (grades 409 or 304) or aluminized steel, with an insulation mat of ceramic fiber to maintain optimal operating temperatures. The housing is designed to withstand continuous operation at temperatures from -40°C to 850°C, with peaks up to 900°C for short periods. It operates at pressures between 1.0 and 1.6 MPa, and must meet leakage rates of ≤0.5%. Key parameters include catalyst volume (2.0–5.0 L), housing diameter (100–300 mm), housing length (200–600 mm), wall thickness (1.5–3.0 mm), and weight (2.0–8.0 kg). Dimensional tolerances on diameter are ±0.5 mm per ISO 2768-m, and surface finish is Ra 3.2–6.3 µm per ISO 1302. The housing must resist thermal shock of ΔT 500 K without cracking. Material grades are specified per ASTM A240 (304–409). These values are reference ranges for directory purposes; actual specifications must be confirmed with the legal manufacturer or supplier for the specific model and application.
Working Principle
The housing creates a sealed environment around the catalyst substrate, directing exhaust gases through the catalyst material while maintaining structural integrity under high temperatures and pressure differentials. It typically includes insulation layers to maintain optimal operating temperatures and mounting features for secure installation in the exhaust system. The housing must ensure uniform flow distribution and minimize backpressure, while protecting the substrate from mechanical stress and thermal shock.
Common Materials
Stainless Steel (Grade 409 or 304), Aluminized Steel, Insulation Mat (Ceramic Fiber)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Operating Temperature-40–850 °CContinuous operation; peak up to 900°C for short periods
Catalyst Volume2.0–5.0 LDetermines conversion efficiency and backpressure
Housing Diameter100–300 mmMust match substrate dimensions and vehicle packaging
Housing Length200–600 mmAffects flow distribution and space velocity
Wall Thickness1.5–3.0 mmThicker for high-pressure applications; thinner for weight reduction
Tolerance on Diameter±0.5 mmEnsures proper fit with substrate and exhaust systemISO 2768-m
Surface FinishRa 3.2–6.3 µmAffects corrosion resistance and weldabilityISO 1302
Material Grade304–409 ASTMStainless steel; 409 for cost, 304 for corrosion resistanceASTM A240
Weight2.0–8.0 kgAffects vehicle fuel economy and handling
Leakage Rate≤0.5 %Excessive leakage reduces SCR efficiency
Thermal Shock ResistanceΔT 500 KMust withstand rapid temperature changes without cracking

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
  • Outer Shell Part
    Primary structural protection and mounting interface
    Material: Stainless Steel
  • Insulation Layer Part
    Thermal insulation to maintain catalyst temperature and protect surrounding components
    Material: Ceramic Fiber Mat
  • Mounting Flanges Part
    Connection points to exhaust piping system
    Material: Stainless Steel
  • Retention System Part
    Secures catalyst substrate in position and accommodates thermal expansion
    Material: Spring Steel / Wire Mesh

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Catalyst Canning / Housing.

SCR Housing Catalyst Container Catalyst Shell

Applied To / Applications

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

Selective Catalytic Reduction (SCR) Catalyst
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 2 bar differential, 5 bar burst pressure
flow rate: 0.5-15 m/s exhaust gas velocity
temperature: -40°C to 650°C continuous, 900°C peak transient
slurry concentration: Not applicable (dry exhaust gas environment)
Media Compatibility
✓ Diesel exhaust gas ✓ Natural gas engine exhaust ✓ Marine engine exhaust
Unsuitable: Chlorinated or halogenated gas streams (risk of stress corrosion cracking)
Sizing Data Required
  • Catalyst substrate dimensions (diameter/length)
  • Exhaust system pressure drop requirements
  • Thermal expansion characteristics of catalyst substrate

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Catalyst bed channeling
Cause: Uneven flow distribution due to improper loading, support grid failure, or thermal cycling causing catalyst settling, leading to bypass of reactants and reduced conversion efficiency.
Pressure vessel fatigue cracking
Cause: Cyclic thermal stresses from startup/shutdown operations combined with corrosion under insulation (CUI) at weld seams or nozzle connections, exacerbated by inadequate stress relief during fabrication.
Maintenance Indicators
  • Sudden, sustained increase in pressure drop across the housing indicating potential bed compaction, fouling, or internal component failure
  • Visible external hot spots or thermal imaging showing abnormal temperature gradients on the vessel shell, suggesting refractory lining degradation or flow maldistribution
Engineering Tips
  • Implement laser scanning during catalyst loading to ensure uniform bed density and distribution, followed by periodic gamma scanning during operation to detect channeling or settling before performance degradation occurs
  • Install corrosion monitoring coupons under insulation at critical stress areas and use acoustic emission testing during thermal cycles to detect incipient crack formation in pressure boundary components

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM E155 - Standard Test Methods for Leaks Using the Mass Spectrometer Leak Detector CE Marking - Pressure Equipment Directive (PED) 2014/68/EU

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.025mm
  • Surface flatness: 0.08mm across mating surfaces
Quality Inspection
  • Helium leak test for hermetic sealing
  • Dimensional verification using coordinate measuring machine (CMM)

Manufacturers of Catalyst Canning / Housing

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Frequently Asked Questions

What is the primary function of a catalyst canning/housing?

The primary function is to contain and support the SCR catalyst substrate, providing mechanical protection, thermal insulation, and secure mounting within the exhaust system. It ensures proper exhaust gas flow through the catalyst while protecting it from physical damage, vibration, and environmental factors.

What materials are commonly used for catalyst housings?

Common materials include stainless steel grades 409 and 304, aluminized steel, and ceramic fiber insulation mats. The choice depends on cost, corrosion resistance, and thermal requirements.

What are typical operating temperature and pressure ranges?

The housing is designed for continuous operation from -40°C to 850°C, with peaks up to 900°C for short periods. Operating pressure ranges from 1.0 to 1.6 MPa.

How can I verify that a specific housing meets my requirements?

You must confirm model-specific values such as dimensions, material grade, and performance parameters with the legal manufacturer or supplier. The values listed in this directory are reference ranges and must be validated for your application.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

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

Preliminary Technical Classification
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