Let’s test everyone: What should be taken into account when designing pressure vessels for hydrogen media?

Determine whether it is in a hydrogen corrosion environment； Regarding the choice of type of leak test, I have come across information stating that hydrogen has strong permeability; therefore, even if a leak test using compressed air yields a positive result, it cannot be guaranteed that hydrogen will not leak~

Hydrogen-containing environments are mainly divided into two types: direct hydrogen exposure and indirect hydrogen exposure. Direct hydrogen exposure is further divided into high-temperature hydrogen exposure and low-temperature hydrogen exposure. Generally speaking, high-temperature exposure to hydrogen poses significant hazards; when selecting materials for design, the Nelson curve should be taken into consideration, and stainless steel should be used whenever possible. Non-high-temperature hydrogen exposure is generally not very hazardous; when designing containers, the focus is mainly on sealing performance. Indirect hydrogen exposure mainly occurs in a wet hydrogen sulfide environment, and carbon steel and low-alloy steel generally suffer from four types of damage: hydrogen-induced cracking, hydrogen embrittlement, stress-guided hydrogen-induced cracking, and sulfide stress corrosion cracking; therefore, carbon steel and low-alloy steel are usually not suitable for use in such conditions.

For explosive media, is it necessary to ground the equipment?

The hazards associated with high-temperature hydrogen exposure are significant; when selecting materials for design, the Nelson curve should be taken into consideration, and stainless steel should be used whenever possible. Non-high-temperature hydrogen exposure is generally not very hazardous; when designing containers, the focus is mainly on sealing performance. Indirect hydrogen exposure mainly occurs in a wet hydrogen sulfide environment, and it generally causes four types of damage to carbon steel and low-alloy steel: hydrogen-induced cracking, hydrogen blistering, stress-guided hydrogen-induced cracking, and sulfide stress corrosion cracking; therefore, carbon steel and low-alloy steel are usually not suitable for use in such conditions!

I mean, when you give ratings and add wealth points, don’t you consider the content of the comments at all? On the 6th floor, you just copy and paste my comments; you don’t delete them, and you even give points and wealth rewards? :L:L:L

Confirmation of hydrogen exposure environment conditions, material selection, manufacturing technology requirements, selection of sealing structures, inspection requirements......

It depends on the pressure level; high-pressure hydrogen containers use special stainless steel, with control over nickel equivalent, nickel content, and ferrite content

We generally refer to HG/T21581-2011