-What material should be used for 35-degree frozen saline pipelines?
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This post was last edited by Qingming Yibei on 2011-4-28 07:43. May I ask what material should be used for frozen saline pipes at -35 degrees? Can 20# steel be used, or should low-temperature steel be employed? What is generally the best material to use? Thank you
Steel grade 20 can be used down to at least -20 degrees Celsius; if domestic materials are to be used, 16Mn can be employed. For imported materials, low-temperature carbon steel or A333 Gr.6 can be used
Reply to 4# yangh1980: What thickness is appropriate? Saltwater corrosion might be quite severe; should the corrosion margin be increased a bit?
At such low temperatures, non-metallic pipes are likely not suitable for use. Although the embrittlement temperature of PE is -70 degrees, it becomes quite brittle at -35 degrees, so it’s best to avoid using it.
A low-temperature carbon steel lining with PTFE can be used! In this way, all aspects can meet your requirements
Composite pipes with linings are expensive; are there any other more suitable options?
When it comes to a product, you shouldn’t consider only the price; you need to look at the cost-performance ratio as well!
-What is used to cool 35-degree saltwater?
Reply to 11# Think twice before using liquid ammonia for cooling.