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