In order to ensure the effective utilization of energy and resources

and ensure the safe operation of pressure vessels.through the periodical inspection of low-pressure carbon steel reaction vessels with hot alkali solution as the medium

It is found under the condition that the hot alkali solution with low mass fraction exceeds the temperature limit for a short time

because the joint action of hot alkali solution and tensile stress

the defects will be enlarged and regenerated in the manufacturing defects

shape mutation and other parts of pressure vessels defects

etc. Based on the effect’s analysis of hot alkali solution on the stress corrosion of low-pressure carbon steel vessel

the damage mode and failure mode of this kind of pressure vessel in the use process are determined

and the preventive measures such as strict material selection

optimization of welding process

increase of post weld heat treatment and avoidance over limit of use temperature in the design

manufacture and use process of this kind of pressure vessel are put forward

as well as

the parts with stress corrosion tendency are mainly inspected in the supervision inspection and periodic inspection.