Why is the pressure in the hydrogen-facing system during hydrogenation prohibited from exceeding 3.5 Mpa before 135°?
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The last edit to this post was made by liuquan1100 on 2017-12-15 at 16:43. Why is it specified that the pressure in the hydrogen-related system during hydrogenation must not exceed 3.5 Mpa before 135°?
This temperature and pressure are primarily determined with regard to hydrogen embrittlement in the reactor; generally, during the startup phase, the temperature is increased first before the pressure is raised. The current temperature should be 93°C, not 135°C. Moreover, the pressure is one quarter of the operating pressure or the design pressure.
The main considerations are the material of the equipment, hydrogen embrittlement, and other such factors
Hydrogen embrittlement, determined by the reactor material
I remember it being no more than 3.0 MPa, taking into account the temper brittleness of austenitic steel
For austenitic stainless steel, it is necessary to prevent hydrogen embrittlement; our requirement is that the temperature should not exceed 93 at 3.88 MPa℃
Now the new chromium-molybdenum-vanadium steel seems to have an even lower MPT.