I. Key Principles: Safety First, Scenario Determines Cycle
For seamless steel pipes used in high-pressure, high-temperature, flammable, or toxic media transportation systems (such as petroleum, chemical, and boiler industries), according to GB/T 8163-2023 standard, no form of defect repair is permitted. Once a defect is discovered, the entire pipe is scrapped; there is no "re-inspection after repair."
Only in non-pressure, structural pipes or low-pressure water systems is repair of shallow surface defects allowed, and an initial comprehensive re-inspection must be conducted immediately after repair, including non-destructive testing, hydrostatic testing, and dimensional verification.
II. Re-inspection Timing and Subsequent Monitoring Recommendations
Initial Re-inspection: Performed immediately after repair to ensure repair quality meets standards before putting the pipe into use.
Regular Inspections During Operation: For general industrial environments, it is recommended to conduct follow-up inspections at the following points:
Perform a visual and non-destructive inspection within the first month after commissioning;
Thereafter, conduct a routine inspection every 6 months in conjunction with equipment shutdown maintenance;
In environments with high vibration, alternating loads, or corrosive conditions, the frequency should be shortened to once every 3 months.
