Anyone know of an internal liner material to protect against internal corrosion

AI Thread Summary
The discussion focuses on finding effective internal liner materials to combat corrosion and erosion in pipework designed for water and methanol vapor. Key operating conditions include temperatures up to 267.1F, pressures reaching 15 PSIG, and a corrosive environment with a pH of 3.5-5.5 and high chloride levels. Participants suggest various solutions, including Teflon spraying, ceramic liners, and epoxy-based coatings, while noting the challenges posed by pitting and the complexity of applying these materials in pipes with a 4-inch diameter and tight bends. The conversation highlights the need for cost-effective options, as traditional methods like cladding and weld overlay can be prohibitively expensive for smaller pipes. Overall, insights into potential liner materials and application techniques are sought to address the corrosion issues effectively.
g0ggs123
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Does anyone have any experience with liner material for application on pipework with internal corrosion/erosion?

Pipes are designed to hold water/methanol vapour

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 (sodium bisulphate)
2) Scale Inhibitor (polymer based)
3) Corrosion Inhibitor (organic)
4) Defoamer (silicon polymer)

Failure mechanisms/ Anomalies detected include:

• Weld root corrosion
• Pitting corrosion
• Synergistic effect of erosion/corrosion
• Impingement 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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I am not a mechanical / materials engineer. However, maybe teflon-coated steel? Unfortunately, if pitting / scouring is a problem, that'll probably scrape off the coating.
 
What is the dia. of pipe ? I mean can anybody enter inside to coat.
If yes, I would suggest Teflon spraying with only upto 2.5 micron thickness other wise pitting problem.

Tom
 
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The pipe has a 4" dia and the section consists of T-joints and tight bends.

Solutions I have looked at so far include Cladding and Weld Overlay but the process costs increase dramatically as the pipe dia decreases.

Cheers for your reply
 
What about some sort of ceramic liner? Maybe a powder-coat application?
 
I have experience with epoxy based liners for steel underground tanks but have never seen anything for in-situ pipe installation.
 

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