Why is it required that carbon steel flue pipes with external insulation have heat- and acid-resistant primers applied to both their inner and outer walls?
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For carbon steel flue pipes with external insulation, why is it required to apply a heat- and acid-resistant primer to both the inner and outer walls? What is the purpose of anti-corrosion treatment in pipelines?
Corrosion protection? A high-temperature and acid-resistant primer can provide corrosion protection.
The flue gas inside the pipe contains sulfides, which result in acidic gases； Contact with air outside the pipe accelerates corrosion ； So it needs to be painted on the inside and outside for corrosion protection.