Internal Liner: Temperature Range -65°C to +260°C

Component Specifications

Definition

An internal liner is a protective component installed inside expansion joints to shield the bellows from corrosive media, abrasive particles, and high temperatures. It maintains system integrity by preventing fluid leakage and contamination while allowing thermal expansion and contraction movements in industrial piping networks.

Working Principle

The internal liner functions as a barrier between the bellows material and the conveyed medium, utilizing its chemical resistance and mechanical strength to withstand process conditions while the expansion joint accommodates thermal movements, vibrations, and misalignments.

Materials

PTFE (Polytetrafluoroethylene), FEP (Fluorinated Ethylene Propylene), EPDM (Ethylene Propylene Diene Monomer), stainless steel (304/316), Inconel, Hastelloy, or fabric-reinforced elastomers depending on temperature (-65°C to +260°C) and chemical exposure requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	1.5mm to 3.0mm
Connection Type	Flanged, butt-welded, or clamped
Pressure Rating	Up to 25 bar
Temperature Range	-65°C to +260°C
Chemical Compatibility	Resistant to acids, alkalis, solvents

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

DIN 4809, ASME B31.3, EJMA Standards

Parent Products

This component is used in the following industrial products

Expansion Joints

Flexible connectors that accommodate thermal expansion, vibration, and misalignment in steam generator tube bundle assemblies

View Product Details

Thermal Expansion Joint

A flexible connector that absorbs thermal expansion and contraction in steam jacket systems.

View Product Details

Engineering Analysis

Risks & Mitigation

Liner detachment under pressure pulsation
Chemical degradation from incompatible media
Thermal stress cracking
Improper installation causing leaks

FMEA Triads

Trigger: Chemical incompatibility with process fluid
Failure: Liner degradation and leakage
Mitigation: Material selection based on chemical resistance charts and compatibility testing

Trigger: Excessive thermal cycling
Failure: Fatigue cracking and loss of integrity
Mitigation: Design with adequate thermal expansion allowances and use materials with appropriate temperature ratings

Industrial Ecosystem

Compatible With

Piping systems, pumps, compressors, heat exchangers, reactors

Typical Suppliers & Equivalents

Garlock, Proco, Witzenmann, Flexicraft, Pathway

Compliance & Inspection

Tolerance

±0.5mm on liner thickness, ±1.0mm on dimensional fit

Test Method

Hydrostatic pressure testing, helium leak detection, visual inspection per EJMA standards

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

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Manufacturers of Internal Liner

Manufacturer profiles associated with Internal Liner.

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Frequently Asked Questions

When should an internal liner be used in expansion joints?

Internal liners are essential when conveying corrosive fluids, abrasive slurries, or high-temperature media that could damage the bellows material, or when preventing product contamination is critical.

What materials are suitable for high-temperature applications?

PTFE and metallic liners (stainless steel, Inconel) are preferred for temperatures above 150°C, while elastomeric liners like EPDM are used for lower temperature ranges.

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.

Internal Liner