What is the definition of a hydrogen-handling system? Does the hydrogenation section of the polypropylene plant belong to the hydrogen-handling system?
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What is the definition of a hydrogen-handling system? Does the hydrogenation section of the polypropylene plant belong to the hydrogen-handling system? Also, regarding whether a dark-light inspection is necessary, I checked and found that such an inspection is used to detect flames; however, the temperature in polypropylene plants isn’t high, so even in the event of a leak, no flames would be generated. Is it meaningful to check with the lights off then? Are there any polypropylene plants with hydrogen systems that conduct dark-light inspections?
A hydrogen-handling system refers to a system in which the medium within the equipment and pipelines is primarily hydrogen; the polypropylene hydrogenation system also falls under this category. A low reaction temperature does not mean there is no danger, as hydrogen has a very wide explosion range, so it is essential to conduct inspections in the dark.
http://bbs.hcbbs.com/thread-500160-1-1.html; this post states that in areas with high temperatures, inspections should be carried out with the lights turned off, while in areas with low temperatures, a hydrogen leak detector should be used for inspections. . . . The temperatures in the polypropylene hydrogenation section are at room temperature; therefore, even in the event of a leak, no flames will be generated. Moreover, hydrogenation is carried out intermittently. Hydrogen leaks spread quickly; even small leaks should not form an explosive mixture, right?
Being in a hydrogen-rich environment does not mean it is such an environment just because there is some hydrogen present; what matters is the percentage of hydrogen and the temperature of the material, to determine whether hydrogen diffusion corrosion will occur, leading to hydrogen embrittlement.
The hydrogen purity in the hydrogenation section of the polypropylene plant is 99.99%, with the material temperature at room temperature. . . The pipeline is made of 316L. .