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

by g0ggs123
Tags: corrosion, internal, liner, material, protect
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g0ggs123
#1
Aug6-09, 02:29 AM
P: 24
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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MATLABdude
#2
Aug7-09, 11:33 PM
Sci Advisor
P: 1,724
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
#3
Aug7-09, 11:54 PM
P: 7
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
#4
Aug9-09, 03:51 PM
P: 24
Anyone know of an internal liner material to protect against internal corrosion

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
#5
Aug9-09, 08:44 PM
PF Gold
Danger's Avatar
P: 8,964
What about some sort of ceramic liner? Maybe a powder-coat application?
FredGarvin
#6
Aug10-09, 11:08 AM
Sci Advisor
FredGarvin's Avatar
P: 5,095
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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