grease structural MS pipe from inside, any harmful types?

[fcu45]

Hi colleagues

Is there any types/components of grease that would be harmful to structural MS pipes?

The approach is prevent internal pipe corrosion.

Thanks

 

[gr2vessels]

Dear colleague fcu45,
First, please clarify for me, what do you intend to do;- are you trying to harm the pipe with grease? It would be easier to blow it to bits, very quick and complete harm. Are you trying to prevent internal corrosion with harmful grease? That's a bit harder, you might need to remove the harmful bits from the grease (or don't add it to the grease). Are you trying to protect internally the pipe to prevent corrosion and you used the word harmful by mistake? There are many different type of treatment you may use for the corrosion protection of structural pipe, inetrnal and external, depending on size, application, etc. One way could be hot dip galvanized (no grease required), if it would fit in the zinc bath. The grease might provide some short term protection, but I wouldn't recommend it for long term.
Please come back with clarifications on what you try to achieve.

 

[fcu45]

Thanks dear gr2vessels

I meant that I want to protect internal side of the pipe by applying grease/oil so I wanted to get a knowledge if there are any oil/grease that may ha e harmful effect rather than protection.

The structure will be air tight from inside, but thought coat of oil will also be good to apply.

Engine oil shouldn't have any harmfull components?

Regards

 

[hokie66]

I would not use motor oil. Linseed oil has been used historically to protect the inside of tubes, and also for bridge cables. But if you can galvanize, do it.

 

[gr2vessels]

The corrosion is based on continuous supply of oxygen. If your system is really air tight, the oil coat will do the job. My doubt is your understanding of 'air tight', for which you gave no details. A small 'blush' of internal rust will not affect the service life of your structure, but again, it relies upon your definition of 'air tight'.
Cheers,
gr2vessels

 

[fcu45]

Thanks colleagues

But why wouldn't you use motor oil dear hokie66? Just for knowledge. ..

Regards

 

[gr2vessels]

One more time;- if the system is air tight, don't waste time, money and energy, you don't need any oil! Don't coat anything inside, just leave it closed, dry, air tight.
Cheers,
gr2vessels

 

[Compositepro]

Linseed oil cures (forms a hard, tough protective film) by reaction with oxygen in the air. There is plenty of O2 in the volume of a pipe, unless you pull vacuum or flush with N2.

 

[EdStainless]

Dry is the critical word. If the system is truly dry there will be no corrosion.
Closed steel structures require very little treatment, but they must actually be sealed.

contact cortecvci.com

You need a surface treatment that is engineered to do many things:
not absorb water
stay stuck to the surface
block oxygen
have corrosion inhibitors
suppress biological growth

A common oil or grease will not do any of these things very well.

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