What Are the Best Liner Materials for Methanol Regeneration System Pipework?

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SUMMARY

The discussion focuses on selecting appropriate liner materials for pipework in Methanol Regeneration Systems, specifically addressing internal corrosion and erosion issues. The pipes operate under temperatures ranging from 172°F to 267.1°F and pressures between 5.4 PSIG and 15 PSIG, with a pH level of approximately 3.5-5.5 and chloride concentrations of 90,000 to 120,000 ppm. Common failure mechanisms include weld root corrosion and pitting corrosion, exacerbated by the presence of fines up to 40 microns. Participants seek recommendations for effective internal lining solutions to mitigate these challenges.

PREREQUISITES
  • Understanding of corrosion mechanisms in piping systems
  • Familiarity with chemical properties of methanol and its effects on materials
  • Knowledge of pipework design and operational parameters
  • Experience with chemical treatment processes such as corrosion inhibitors
NEXT STEPS
  • Research suitable liner materials for high-corrosion environments, such as fluoropolymer coatings
  • Investigate the effectiveness of epoxy-based linings in methanol applications
  • Explore advanced materials like stainless steel or composite liners for enhanced durability
  • Learn about the application of corrosion inhibitors specifically designed for methanol systems
USEFUL FOR

Process engineers, materials scientists, and maintenance professionals involved in the design and upkeep of Methanol Regeneration Systems, particularly those addressing corrosion and erosion challenges in pipework.

g0ggs123
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Does anyone have any experience with liner material for application on pipework with internal corrosion/erosion in a Methanol Regeneration System?

There are issues with internal pipe corrosion in a Methanol processing systems I am dealing with.

To alleviate the current high rates it has been proposed that the pipe work be upgraded.

The pipes are designed to hold hot methanol and water in both liquid and vapour form.

Normal operating conditions for the pipes:

Temperature
• Average temp - 172F
• Max temp - 267.1F

Pressure
• Average internal pipe pressure - 5.4 PSIG
• Max internal pipe pressure - 15 PSIG

Acidity level
• pH level of ~3.5-5.5

Chloride level
• 90000 – 120000ppm

Fines of up to 40 microns collect in the system and circulate the pipe work within the liquid which has a max flow rate of 200USPGM.

Process treatment in the pipes consists of:

1) Oxygen Scavenger
2) Scale Inhibitor
3) Corrosion Inhibitor
4) Defoamer

Failure mechanisms/ Anomalies detected include:

• Weld root corrosion
• Pitting corrosion
• Synergistic effect of erosion/corrosion


If anyone has experience with using an internal liner or lining material with applications similar to the above any feedback would be much appreciated.
 
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