Regarding the time for the initial inspection of pressure vessels
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Article 6 of the Rules for Periodic Inspection of Pressure Vessels: Pressure vessels are generally subject to their first periodic inspection within 3 years after being put into use. Discussion: Can the first comprehensive inspection of a pressure vessel exceed three years? What are the arguments if the inspection is not carried out after three years?
Based on domestic and international inspection and accident analysis statistics, the likelihood of accidents occurring in equipment after three years of operation is relatively high. In most cases, due to the limitations of detection methods, equipment may leave the factory and operate with existing defects. The initial inspection after three years is carried out to determine whether these inherent defects have worsened or if new defects have appeared, thereby minimizing the probability of accidents. Generally speaking, the accident occurrence rate curve for a piece of equipment resembles the shape of the bottom of a bathtub: at first, the probability is high, representing a period of frequent accidents; thereafter it levels off, entering a stable phase; and finally, as the equipment reaches the end of its design life, the accident rate begins to increase again.
If it has been more than three years since the inspection, a legitimate reason for extension must be provided before the deadline, and the matter must be submitted to the local oversight authority; generally, there are limits on the duration of such extensions.
Overdue splitting is legal and illegal. A preliminary inspection should generally be carried out.