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## Overview

Exhaust bellows are specialized metallic expansion joints designed for diesel generator exhaust systems,

engine exhaust pipes and high-temperature gas applications. Manufactured from high-grade stainless steel

(321 or 310S), these bellows absorb thermal expansion, engine vibration and misalignment in exhaust

systems operating at temperatures up to 650°C and beyond.

## Features

• High-temperature stainless steel construction (SS 321, 310S, Inconel)
• Single or multi-ply bellows for pressure containment
• Outer braid or cover for insulation and protection
• Flanged or butt-weld end connections
• Can include flexible pipe sections
• Designed for pulsating exhaust flow
• Corrosion-resistant materials
• Manufactured to EJMA and international standards

## Applications

• Diesel generator (DG set) exhaust systems
• Gas generator exhaust connections
• Industrial engine exhaust piping
• Marine engine exhaust systems
• Boiler breechings and flue gas connections
• Turbine exhaust systems
• Incinerator and furnace exhaust
• High-temperature process gas piping
• Emergency generator exhaust in buildings

## Technical Specifications

• Material: Stainless Steel 321 (standard), 310S (high temp), Inconel 625 (extreme)
• Temperature: Up to 650°C (SS 321), up to 1000°C (Inconel)
• Pressure: Typically low pressure, up to 0.5 bar in exhaust systems
• Size Range: DN50 (2″) to DN1200 (48″)
• Bellows Type: Single-ply or 2-ply for safety
• End Connections: Fixed flanges, floating flanges or butt-weld
• Outer Protection: Braided SS wire mesh or thermal insulation cover
• Movement: ±15mm to ±50mm axial, ±10mm lateral, ±5° angular

## Why Exhaust Systems Need Bellows

**Thermal Expansion:**

Exhaust pipes expand significantly (steel expands 12mm per meter at 500°C).

**Engine Vibration:**

Running engines create substantial vibration requiring flexible connections.

**Misalignment:**

Building settlement or foundation movement needs compensation.

**Acoustic Isolation:**

Flexible bellows reduce noise transmission through exhaust piping.

**Stress Relief:**

Prevents stress on engine exhaust manifold and silencer connections.

## Construction Types

**Basic Exhaust Bellow:**

Stainless steel bellows with flanges, suitable for moderate temperatures.

**Insulated Exhaust Bellow:**

Bellows with thermal insulation blanket to reduce heat radiation.

**Braided Exhaust Bellow:**

Outer stainless steel braid protects bellows and improves appearance.

**Flexible Exhaust Pipe:**

Long corrugated flexible pipe (up to 3 meters) with or without braid.

## Design Considerations

• Exhaust gas temperature (peak and average)
• Engine vibration amplitude and frequency
• Thermal expansion of exhaust piping
• Back pressure requirements (low restriction)
• Flange standards (ANSI, DIN, custom)
• Installation space and routing
• Indoor or outdoor installation
• Required service life

## Benefits

• Accommodates thermal expansion in hot exhaust systems
• Isolates engine vibration from exhaust piping
• Reduces stress on engine exhaust manifold
• Prevents exhaust system failures and leaks
• Allows flexibility for engine movement
• Reduces noise transmission
• Long service life in high-temperature applications
• Corrosion-resistant stainless steel construction

## Installation Guidelines

• Install as close to engine as practical (within 1-2 meters)
• Support exhaust pipe properly – do not hang weight on bellow
• Use proper gaskets rated for high temperature
• Allow clearance for thermal expansion movement
• Protect from mechanical damage
• Insulate exhaust piping per safety requirements
• Check for exhaust leaks after start-up
• Follow engine manufacturer recommendations

## Common DG Set Sizes and Bellow Specifications

**10-30 kVA Generators:**

DN50-DN80 (2″-3″) exhaust bellows, 500-600°C temperature.

**30-100 kVA Generators:**

DN80-DN100 (3″-4″) exhaust bellows, 550-650°C temperature.

**100-500 kVA Generators:**

DN100-DN150 (4″-6″) exhaust bellows, 550-650°C temperature.

**500+ kVA Generators:**

DN150-DN300 (6″-12″) exhaust bellows, 600-700°C temperature.

## Maintenance

• Inspect bellows annually for cracks or damage
• Check for exhaust leaks at connections
• Verify proper pipe support (no sagging)
• Replace if significant corrosion or fatigue cracks visible
• Typical service life: 10-15 years in normal conditions

## Quality Assurance

• Material certifications (mill test certificates)
• Pressure testing (if applicable)
• Dimensional inspection
• Visual inspection of welds
• Documentation package with each order

Contact RMS Corporation with engine/generator specifications (kVA rating, exhaust temperature, pipe

size, flange type) for exhaust bellow selection and supply.

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