How to prevent crystallization in 98% sulfuric acid pipelines on the utility tunnel? ?
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As the title suggests, the newly built factory facility of our company has sulfuric acid pipelines in the utility tunnels. Since crystallization occurs easily in winter, with the lowest temperatures reaching -13°C, the weather is quite cold. We plan to use hot water for heating (at 40-50°C). However, as these pipelines connect to other workshops on an intermittent basis, there is a risk that the hot water will continuously heat the sulfuric acid pipelines, leading to increased corrosion or even damage to the pipes. We would appreciate guidance from those with experience in this area. Thank you
The minimum temperature can reach -13°C; insulation is sufficient to handle this. If all else fails, electric trace heating wires can be added to the insulation layer for intermittent heating.
If all else fails, use pipes lined with PTFE; they’re resistant to corrosion
Do not use hot water for tracing; is it feasible to use circulating water for tracing instead?
There are many Class A materials on the pipe gallery, posing a high risk of electric heat tracing.
I’ve thought about it too, but the temperature of the circulating water is relatively low in winter, so the effect might not be very good.
From what the poster seems to mean, intermittent heating is intended. With circulating water, I think it will freeze at -13°C; for hot water heating, nitrogen can be used to push the hot water back if that’s not feasible；
It’s rather cumbersome to operate; moreover, the hot water is used continuously, and the other pipes also require trace heating