Scene of fluoroplastic-lined pipes transporting concentrated sulfuric acid being inserted into water
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A stainless steel pipe lined with PTFE is used for adding chemicals to the circulation tank; the medium transported is concentrated sulfuric acid. The pipe has a diameter of two inches, a flow rate of 300 liters per hour, and it operates on a timed basis. The pipe is submerged in water by 1 meter, and the temperature of the circulating water reaches up to 45 degrees. Could anyone assess the corrosion status and usability of this pipe?
Lined with PTFE, no problem. Fully meets the usage requirements. (Question: What is the temperature of the concentrated sulfuric acid being transported?) What’s the concentration? For 98% concentrated sulfuric acid, 304 should be sufficient on its own.)
Local high temperatures may occur, and in extreme cases local boiling can take place, damaging the tank.
The circulation tank has a capacity of 300 cubic meters; I’m not worried about the tank being damaged. What concerns me is whether the local high temperatures generated by 98% concentrated sulfuric acid entering the water could damage the PTFE-lined 304 stainless steel inner tubes.
I’m not afraid of temperatures in the dozens; however, extremely high temperatures may not be safe
Temperature and material concentration are completely fine with PTFE. Do you use a PTFE tube as an inner lining inside the stainless steel tube? Is it still a stainless steel tube with PTFE coating inside? If spraying is used, anti-corrosion treatment can be applied to both the inside and outside of the pipe; a halogen-based coating will suffice, as long as its thickness is appropriate. It will have a long service life.
It just feels unsafe this way. It feels like a mess!
Everyone thinks it’s not reliable, but the need for acid resistance does exist; so I’m weighing between a 316L lining with PTFE and one made of Hastelloy C276.
It’s not that the material is unsuitable. It’s mainly because the process design is too messy. Have you considered the on-site environment and pool protection? Soon, the waterproofing of the pool failed, then the cement was damaged by salt, and in the end the pool became extremely leaky……
It seems you know nothing about water treatment; adding sulfuric acid to control the concentration ratio of circulating cooling water is a common practice, and moreover, this isn’t just ordinary water treatment. Rotten cooling ponds – I have never heard of nor seen them.
I’m sorry upstairs; I really don’t understand. Sorry, I let an expert make a joke.