Re: Ultra-smooth surfaces

On May 27, 6:41 pm, "Keith Willshaw"
<ke...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
"Jack Linthicum" <jacklinthi...@xxxxxxxxxxxxx> wrote in message

news:039adea6-6993-4621-8a3a-db023704cde6@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
. A strong coating would

permit light weight engines and cogs.

Unfortunatrly in real life pipes are not treated in a manner that would
be required to avoid thin coatings being chipped. In any case if
you want a coating to adhere you want a reasonably rough surface.

Keith
Maybe things have changed but in the 50s there were requirements for
coatings in the form of a petroleum based layer and fiber glass and
paper wrapping which was then coated with an anti-moisture barrier. I
see a whole slug of suppliers of similar materials on the internet.

Such coatings arent exactly thin and they arent especially resistant to high
temperatures either. High Performance Composite Coatings and expoxy
coatings are rated at around 85C while Asphalt coatings are rated at around
70 C. Cement and Polyamide coatings are good for up to 300 C, none
are going to operate at the sort of temperatures the OP was talking about..
To be fair Polyamide coatings can be quite thin but require special
attention to
field joints to avoid failure.

These are all susceptible to post installation damaged especially if applied
to
pipes in a refinery or chemical plant rather than a pipeline which is a more
typical use.

Keith

I ignored the OP, the thread has usually bent off at least 90 degrees
by the 20th poster. I was reciting from memory and looking up the
current state of art.
.

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