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Flange Spacer Installation Best Practices

Flange Spacer Installation Best Practices

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Proper installation of a thermoplastic flange spacer is essential for maintaining reliable performance in lined piping systems. Whether the spacer is being used to provide butterfly valve clearance, compensate for flange alignment, create a diameter transition, or maintain proper spacing, following proven installation practices helps ensure safe operation and long service life.

While thermoplastic flange spacers are engineered for durability and corrosion resistance, incorrect installation can lead to leaks, flange misalignment, uneven gasket compression, and unnecessary maintenance. This guide outlines the best practices for installing thermoplastic flange spacers in industrial lined pipe systems.

Why Proper Installation Matters

  • Maintain accurate flange spacing
  • Improve butterfly valve clearance
  • Support proper gasket compression
  • Prevent unnecessary stress on flanges
  • Reduce maintenance and downtime
  • Extend service life

Step-by-Step Installation Best Practices

Step 1 — Verify the Correct Spacer Before Installation

  • Confirm pipe size
  • Spacer type
  • Material
  • Thickness
  • Bolt hole pattern
  • Outside diameter (OD)
  • Inside diameter (ID)

Step 2 — Inspect All Components

  • Inspect flange faces, bolts, nuts, washers, and spacer for damage
  • Clean all sealing surfaces before assembly

Step 3 — Confirm Material Compatibility

  • Select PTFE, PVDF, or Polypropylene based on chemical compatibility, temperature, and process conditions

Step 4 — Ensure Proper Flange Alignment

  • Never force misaligned flanges together using bolt torque
  • Correct piping alignment before tightening

Step 5 — Position the Spacer Correctly

  • Center the spacer
  • Verify bolt hole alignment
  • Ensure the ID is concentric with the pipe

Step 6 — Install Compatible Gaskets

  • Always use the gasket specified for the application
  • Ensure compatibility with the process media

Step 7 — Tighten Bolts Using the Proper Sequence

  • Hand-tighten all bolts
  • Tighten in a crisscross pattern
  • Increase torque gradually
  • Follow manufacturer torque specifications

Step 8 — Avoid Over-Torquing

  • Excessive torque can distort thermoplastic spacers, damage gaskets, and shorten service life

Step 9 — Verify Butterfly Valve Clearance

  • Confirm the valve disc rotates freely after installation when applicable

Step 10 — Inspect Before Pressurizing

  • Verify bolt torque, gasket placement, spacer orientation, valve operation, and flange alignment

Common Installation Mistakes

  • Wrong spacer thickness
  • Wrong spacer style
  • Over-tightening
  • Reusing damaged spacers
  • Installing over damaged flange faces

Ongoing Inspection

Periodically inspect for cracking, warping, chemical attack, loose hardware, and leakage.

Final Thoughts

Following proper installation procedures helps maximize reliability, reduce downtime, and extend the service life of thermoplastic flange spacers in lined pipe systems.

Need Help Selecting the Right Flange Spacer?

Not sure which thermoplastic flange spacer is right for your lined pipe application? Our team can help you identify the correct spacer type, material, thickness, and dimensions for your system. Contact us today to discuss your application or request a custom quote.

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