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

In summary, the participants of the conversation discussed the need for a liner material to prevent internal corrosion/erosion in pipes used for water/methanol vapor. They shared information about the normal operating conditions for the pipes such as temperature, pressure, acidity and chloride levels. They also mentioned the process treatments used and the failure mechanisms/anomalies detected. The conversation then shifted to potential solutions such as teflon-coated steel, teflon spraying, and ceramic liners. One participant suggested the use of epoxy-based liners, but this had only been used for underground tanks and not for in-situ pipe installation.
  • #1
g0ggs123
22
0
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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  • #2
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.
 
  • #3
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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  • #4
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
 
  • #5
What about some sort of ceramic liner? Maybe a powder-coat application?
 
  • #6
I have experience with epoxy based liners for steel underground tanks but have never seen anything for in-situ pipe installation.
 

1. What is internal corrosion and why is it a concern?

Internal corrosion occurs when the interior surface of a material, such as a pipeline or tank, is degraded due to chemical or electrochemical reactions. This can lead to material failure, leaks, and potentially hazardous situations. It is a concern because it can compromise the integrity and safety of the structure.

2. What types of materials are commonly used as internal liners?

There are several types of materials that are commonly used as internal liners to protect against corrosion. These include polymers, such as polyethylene and polypropylene, as well as metals like stainless steel and aluminum. In some cases, ceramic materials may also be used.

3. What factors should be considered when selecting an internal liner material?

When selecting an internal liner material, several factors should be taken into consideration. These include the type of corrosive environment the liner will be exposed to, the temperature and pressure conditions, the expected lifespan of the structure, and the compatibility of the liner with the material being protected.

4. How do internal liners protect against corrosion?

Internal liners protect against corrosion by acting as a barrier between the corrosive substance and the material being protected. This prevents direct contact and inhibits the chemical or electrochemical reactions that lead to corrosion. Additionally, some liners may have corrosion-resistant properties that can further protect against degradation.

5. Are there any drawbacks to using internal liners?

While internal liners can provide effective protection against corrosion, there are some potential drawbacks to consider. These may include the cost of installation and maintenance, as well as the possibility of liner failure or degradation over time. It is important to carefully consider all factors and select the most suitable liner for the specific application.

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