Nominal pressure of hydrogen fluoride pipeline
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For PTFE-lined hydrogen fluoride pipelines at normal and low pressures, is a nominal pressure of PN25 required? For larger PTFE-lined valves, no PN25 grade is available.
It depends on the production process; if it is produced at low pressure, PN16 is also acceptable
PN25 is quite demanding; what is commonly seen is PN16
As a supplementary note, if the pipe diameter is small enough, it can theoretically meet PN25 requirements
I’ve encountered this issue; the only solution is to make the connection flange PN25 in size to facilitate connection
Larger pipes are available, but valves of PN25 or higher are relatively scarce. JB/T 14311-2022 Steel globe valves with fluoroplastic-lined flange connections: This document specifies the structural types, technical requirements, materials, testing methods, inspection rules, marking, and supply requirements for steel globe valves with fluoroplastic-lined flange connections. This document applies to nominal pressures of PN6–PN16 and nominal sizes of DN15–DN400, or nominal pressures of PN25 and nominal sizes of DN15–DN100, or nominal pressures of PN40 and nominal sizes of DN15–DN50, or pressure classes of Class150 and nominal sizes of NPS1/2–NPS8, or pressure classes of Class300 and nominal sizes of NPS1/2–NPS2 ； Applicable temperature: -29°C to 180°C℃ ； The applicable media are corrosive liquids or gases such as acids, bases, and salts that contain no solid particles ； Manufacturing of fluoroplastic-lined steel globe valves with end connections in straight, corner, and Y-type configurations using flange connections.