INDUSTRY COMPONENT

Internal Liner

Internal liner for expansion joints providing corrosion resistance and fluid containment in piping systems.

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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
  • 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
Standards
ISO 9001, DIN 4809, ASME B31.3, EJMA Standards

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Internal Liner.

expansion joint liner PTFE liner corrosion protection piping systems industrial sealing thermal expansion chemical resistance Internal Liner Internal Liner in Machinery and Equipment Manufacturing

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 designed to absorb 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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.5 / 5.0 (11 reviews)

"Found 35+ suppliers for Internal Liner on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Internal Liner is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Internal Liner so far."

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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