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

[g0ggs123]

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.

 

[g0ggs123]

thanks all for your input