A metering pump is used to transport hydrochloric acid at 20 MPa; what material should be chosen?
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What material should be used for a metering pump that transports hydrochloric acid at 20 MPa and 40 degrees Celsius? Stainless steel 316L is not resistant to hydrochloric acid, and steel-lined with fluorine cannot withstand such high pressures. Hastelloy: there are no large, solid pieces available; everything is in the form of sheets and tubes. Moreover, the price is extremely high – it’s really frustrating! I hope experienced colleagues can offer some advice!
What process requires such high-pressure hydrochloric acid?
This post was last edited by qugd on 2019-9-2 at 10:10; a gold-plated tube will do. Judging from the poster’s question, cost seems to be not a concern in this scenario; therefore, coating high-pressure steel pipes with gold would ensure that corrosion is no issue. The cost of gilding won’t be very high; I don’t think that tube is several hundred millimeters in diameter and several kilometers long.
Check whether the pressure value is correct, and also verify whether it is hydrogen chloride or hydrochloric acid.
Hastelloy can handle it; it’s not known whether tantalum metal can withstand such high pressure.
If it’s a one-time investment, gold plating could also be considered; precious metals are used in thermocouples, catalysts, and circuit board leads after all.