Internal Liner Material

[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

 

[oswaler]

I have extensive experience with materials and their applications in various industries. In regards to your question about internal liner material for pipework in a Methanol Regeneration System, I would recommend considering materials that have high resistance to both corrosion and erosion. Some potential options could include ceramic coatings, such as alumina or zirconia, as well as high-performance polymer coatings, such as polyurethane or epoxy.

Additionally, it is important to consider the operating conditions of the pipes, such as temperature, pressure, acidity, and chloride levels, as these can affect the performance of the liner material. It may also be beneficial to conduct a thorough analysis of the failure mechanisms and anomalies detected in order to select a liner material that can effectively address these issues.

Furthermore, the use of a multi-layered approach, such as combining a corrosion inhibitor with a wear-resistant coating, may provide better protection against corrosion and erosion. It is also important to regularly monitor and maintain the pipes, as well as properly select and apply the liner material, in order to ensure its effectiveness and longevity.

In summary, selecting the appropriate internal liner material for your specific application is crucial in mitigating the effects of corrosion and erosion in your Methanol Regeneration System. I recommend consulting with a materials specialist or conducting further research to determine the best solution for your system.