Internal pipe liner for water/methanol system with high chloride and erosion-corrosion

[g0ggs123]

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.

 

[MATLABdude]

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.

 

[Tom Kelly]

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

 

[g0ggs123]

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

 

[Danger]

What about some sort of ceramic liner? Maybe a powder-coat application?

 

[FredGarvin]

I have experience with epoxy based liners for steel underground tanks but have never seen anything for in-situ pipe installation.