Thermal Expansion Joint for Steam Jacket Systems

Product Specifications

Technical details and manufacturing context for Thermal Expansion Joint

Definition

The Thermal Expansion Joint is a component used in steam jacket systems, particularly within oilseed pre-conditioning equipment. Its primary function is to accommodate dimensional changes caused by temperature fluctuations during the conditioning process, thereby preventing stress buildup, leaks, and structural damage to the steam jacket assembly. The joint is designed with flexible bellows or corrugated sections made from metals or specialized alloys, which compress or extend in response to thermal expansion and contraction of the piping, maintaining system integrity while allowing for movement. This directory entry provides reference parameters that must be verified for the specific model and application. The nominal diameter ranges from DN15 to DN600 (ISO 6708), and the operating pressure is 1.0–1.6 MPa. Operating temperature is -20 to 350°C; above 350°C, alloy bellows are required. Axial stroke is 10–50 mm, lateral deflection is 5–20 mm per joint, and angular deflection is 2–10° per joint. Bellows material options include SS304 and SS316L (ASTM A240), with 316L recommended for corrosive media. Flange standards are PN16/PN25 (EN 1092-1). Leakage rate is ≤0.05 mL/min at rated pressure. Cycle life is 1000–5000 cycles (EJMA), and weight ranges from 5 to 150 kg, depending on size and pressure rating. These values are typical ranges for the product category and must be confirmed with the legal manufacturer or supplier for the intended application. Standards listed are procurement references and do not imply certification or compliance of any specific product. Always verify model-specific values and standards before purchase or installation.

Working Principle

The joint uses flexible bellows or corrugated sections made from metal or specialized alloys. These sections compress or extend in response to thermal expansion and contraction of the steam jacket piping. This movement absorbs dimensional changes, preventing stress buildup, leaks, and structural damage. The bellows are designed to handle specified axial, lateral, and angular movements while maintaining system integrity. The working principle relies on the elastic deformation of the bellows material, which returns to its original shape after the thermal cycle, ensuring long-term performance within the rated cycle life.

Common Materials

Stainless Steel 316L, Inconel 625

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	DN15–DN600 mm	Matches pipe sizeISO 6708
Operating Temperature	-20–350 °C	Above 350°C requires alloy bellows
Axial Stroke	10–50 mm	Compression and extension
Lateral Deflection	5–20 mm	Per joint
Angular Deflection	2–10 °	Per joint
Bellows Material	SS304/SS316L	316L for corrosive mediaASTM A240
Flange Standard	PN16/PN25	Drilling per standardEN 1092-1
Leakage Rate	≤0.05 mL/min	At rated pressureISO 5208
Cycle Life	1000–5000 cycles	Depends on stroke and pressureEJMA
Weight	5–150 kg	Depends on size and pressure rating

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

Bellows Part
Flexible element that absorbs thermal movement

Material: Stainless Steel
End Connections Part
Flanges or weld ends for pipe attachment

Material: Carbon Steel
Internal Liner Part
Reduces turbulence and protects bellows from media flow

Material: Stainless Steel

Manufacturers of Thermal Expansion Joint

Manufacturer profiles associated with Thermal Expansion Joint.

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Frequently Asked Questions

What is the purpose of a thermal expansion joint in a steam jacket?

It absorbs thermal expansion and contraction of the piping, preventing stress buildup, leaks, and structural damage to the steam jacket assembly.

What materials are available for the bellows?

The bellows can be made from SS304 or SS316L (ASTM A240). SS316L is recommended for corrosive media. For temperatures above 350°C, alloy bellows such as Inconel 625 may be required.

What are the typical operating limits?

The nominal diameter ranges from DN15 to DN600, operating pressure is 1.0–1.6 MPa, and temperature range is -20 to 350°C. Axial stroke is 10–50 mm, lateral deflection 5–20 mm, and angular deflection 2–10° per joint. These are reference values; verify for your application.

How do I verify the correct model for my system?

Check the required pipe size, operating pressure, temperature, and movement requirements against the manufacturer's specifications. Confirm standards such as ISO 6708, EN 1092-1, and EJMA guidelines with the supplier.

Data Basis

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

Preliminary Technical Classification

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pressure:	Up to 16 bar (standard), up to 40 bar with reinforced designs
other spec:	Axial movement: ±10mm to ±100mm, Lateral movement: ±5mm to ±20mm, Angular deflection: ±5° to ±15°
temperature:	-40°C to +200°C (standard), up to +400°C with special materials

Thermal Expansion Joint

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