INDUSTRY COMPONENT

Canister/Shell

The canister/shell is the outer housing of a Diesel Oxidation Catalyst (DOC) that contains and protects the catalyst substrate while directing exhaust flow.

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Component Specifications

Definition
The canister or shell in a Diesel Oxidation Catalyst (DOC) is a cylindrical or oval-shaped metal enclosure designed to house the ceramic or metallic catalyst substrate. It serves as a structural container that withstands high exhaust temperatures (typically up to 700°C), pressure fluctuations, and mechanical stresses while ensuring proper exhaust gas distribution across the catalyst surface. The shell provides thermal insulation, prevents catalyst damage from external impacts, and maintains the integrity of the exhaust system by sealing against gas leaks.
Working Principle
The canister/shell operates by containing the DOC's catalyst substrate within a sealed, insulated environment. Exhaust gases enter through an inlet, flow through the substrate where oxidation reactions occur, and exit through an outlet. The shell's design ensures uniform gas distribution, minimizes thermal losses, and withstands thermal expansion/contraction cycles. It also provides mounting points for integration into the exhaust system and may include heat shields or insulation layers to protect surrounding components.
Materials
Typically made from austenitic stainless steel grades (e.g., AISI 304, 309, or 409) for corrosion resistance and high-temperature durability. May include aluminized steel or nickel alloys for enhanced thermal performance. Insulation materials like ceramic fiber mats or intumescent seals are often integrated.
Technical Parameters
  • Length 150-600 mm
  • Weight 2-15 kg
  • Diameter 100-300 mm
  • Wall Thickness 1.5-3.0 mm
  • Pressure Rating Up to 2 bar
  • Operating Temperature Up to 700°C
Standards
ISO 16183, DIN 70010, SAE J244

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Canister/Shell.

DOC canister exhaust shell catalyst housing diesel oxidation catalyst automotive exhaust component stainless steel shell emission control Canister/Shell Canister/Shell in Motor Vehicle Manufacturing

Parent Products

This component is used in the following industrial products

Diesel Oxidation Catalyst (DOC)

An exhaust aftertreatment device that oxidizes carbon monoxide (CO) and hydrocarbons (HC) in diesel exhaust gases to reduce emissions.

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Engineering Analysis

Risks & Mitigation
  • Thermal fatigue cracking
  • Corrosion from exhaust condensates
  • Gas leakage due to seal failure
  • Mechanical damage from impacts
FMEA Triads
Trigger: Thermal cycling and vibration
Failure: Crack formation in welds or material
Mitigation: Use fatigue-resistant materials, optimize weld designs, and implement vibration damping mounts
Trigger: Exposure to corrosive exhaust gases
Failure: Corrosion and material thinning
Mitigation: Select corrosion-resistant alloys (e.g., 309 stainless steel) and apply protective coatings
Trigger: Poor sealing at connections
Failure: Exhaust gas leakage
Mitigation: Use high-temperature gaskets, precision machining of flanges, and regular inspection protocols

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances per ISO 2768-m, pressure testing to 1.5x operating pressure
Test Method
Helium leak testing, thermal cycling tests, vibration testing per SAE J244, corrosion resistance testing

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of a DOC canister/shell?

It houses and protects the catalyst substrate, directs exhaust flow, and withstands high temperatures and pressures in diesel exhaust systems.

Why is stainless steel commonly used for DOC shells?

Stainless steel offers excellent corrosion resistance, high-temperature strength, and durability under thermal cycling conditions typical in exhaust applications.

How does the shell design affect DOC performance?

Proper design ensures uniform gas flow distribution, minimizes thermal losses, prevents leaks, and maintains structural integrity under vibration and thermal stress.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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