Hydrogen service is a condition in which the medium contains hydrogen.

Hydrogen-dependent equipment refers to the equipment containing hydrogen in the medium, including the hydrogenation reactor, the hydrogenation heat exchanger and the hydrogenation separator.

Under high temperature and high pressure conditions, hydrogen is easy to produce hydrogen and hydrogen sulfide corrosion with steel equipment, resulting in steel strength reduction, or even damage to equipment

It can be divided into hydrogen-dependent process and non-hydrogen-dependent process.

Due to the particularity of hydrogen medium (small molecule, easy penetration, hydrogen embrittlement, explosive, etc.), high quality requirements are required for the valve body and valve cover:

Forgings are preferred for body & bonnet material. Casting can be selected for large-caliber valves, but RT secondary sheet standard is required.

Valve design and manufacturing can not have sharp chamfering, all chamfering needs to be smooth, parts processing accuracy and surface are very high requirements;

Valves need to be cleaned strictly;

During the pressure test, the strength test should be done for gas strength test, not just for water strength test.

In the case of hydrogen valve, the requirements will be higher. The material of valve shall control the content of C, S and P, and conduct crystal phase test, etc.

Valves with hydrogen media can also be tested with hydrogen according to SHELL 77/308 specifications.

Must pay attention to fire safe, blow-out proof, and anti - static.