Canister/Shell: Diameter 100-300 mm, Length 150-600 mm

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 stainless steels - the austenitic grades AISI 304 and 309, or the ferritic grade AISI 409 that is the usual choice for exhaust shells 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

Parameter	Typical range	Notes & selection driver
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

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 16183, DIN 70010, SAE J244

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

Diesel engines in trucks, buses, construction equipment, and industrial generators

Typical Suppliers & Equivalents

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

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 Canister/Shell

Manufacturer profiles associated with Canister/Shell.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

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.

Canister/Shell