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

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Discussion Overview

The discussion revolves around identifying suitable internal liner materials to protect pipework from internal corrosion and erosion. The context includes specific operating conditions such as temperature, pressure, and chemical composition of the fluids involved, as well as the failure mechanisms observed in the pipes.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about experiences with liner materials for pipes exposed to corrosive conditions, detailing specific operating parameters and failure mechanisms.
  • Another suggests using Teflon-coated steel, noting concerns about the coating's durability in the presence of pitting and scouring.
  • A participant questions the diameter of the pipe and proposes Teflon spraying with a thickness limit to mitigate pitting issues.
  • It is noted that the pipe has a 4" diameter and includes complex geometries like T-joints and bends, which complicate the application of certain solutions.
  • One participant proposes the idea of a ceramic liner or powder-coat application as a potential solution.
  • A participant shares their experience with epoxy-based liners for underground tanks but mentions a lack of knowledge regarding in-situ pipe installations.

Areas of Agreement / Disagreement

Participants express various opinions on potential liner materials, but no consensus is reached on a specific solution. Multiple competing views and suggestions are presented without resolution.

Contextual Notes

The discussion highlights limitations related to the complexity of the pipe geometry and the specific conditions under which the liners would need to perform. There is also uncertainty regarding the effectiveness of different materials in addressing the identified corrosion mechanisms.

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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