Instrument selection for high-temperature, high-pressure hydrogen-containing media
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These past couple of days I’ve reviewed several project specifications for instruments used in hydrogen-containing media; for pressure transmitters, the diaphragms are made of 316L coated with gold. As for temperature and balanced flow meters, the specifications state that protection against hydrogen embrittlement is required. How do instrument manufacturers handle the material of thermometer casings and the measuring elements of flowmeters in order to meet the requirements for preventing hydrogen embrittlement?
You should ask directly about the design of the specification sheet.
This post was last edited by hxch150804 on 2018-9-6 at 14:16. After electroplating, dehydrogenation is carried out in an incubator at 200°C for 2 hours to eliminate the effects of hydrogen embrittlement; for products with higher requirements, vacuum dehydrogenation can be used
A clear, pure fluid medium that is not turbid, does not contain precipitates, and is not viscous; it can be used to reduce pressure and temperature, allowing measurement at normal temperatures – that’s exactly what’s needed. This is a universal principle. There’s no such thing as hydrogen embrittlement at room temperature. . . Use a regular pressure transducer to handle hydrogen easily. Come to buy the step-down transformer made by my brother. I guarantee it for 10 years – it won’t break. :lol
Heat treatment is required; otherwise the welds will crack, in high-pressure hydrogenation units
They are all experts. Is it just two-phase flow? Is it hydrogenation?
Generally, the raw materials are required to undergo NACE treatment; in practice, this involves conducting a third-party test to obtain a report.