What do you mean by "three checks and four determinations"

Three inspections and four determinations are a process experienced by petrochemical industry before the completion of the project.

Three checks: check design omissions, check project quality and hidden dangers, and check unfinished quantities. Four decisions: determine the tasks, personnel, time and measures for the problems found out and complete them within a time limit. Another explanation is: personnel, measures, time and funds.

Review the design and construction drawing for the last time according to the actual situation on site to see if there are any design omissions and whether it is necessary to supplement or improve the design.

"Three inspections and four determinations" is a process experienced by petrochemical industry before the completion of the project. It passed the "three inspections and four determinations" and officially appeared in the "Chemical Debugging Regulations" issued by the Ministry of Chemical Industry 1988. Three inspections and four determinations are the quality assurance of the project.

Therefore, it becomes an effective means to ensure the success of linkage debugging and trial operation. Three inspections and four determinations are the acceptance of the construction unit by the owner and supervisor before completion. This work is the premise of long-term stable operation of the device.

How to check the construction quality;

First, check whether the installation of process equipment and pipelines is consistent with the design drawings, and then conduct a comprehensive appearance quality inspection. If rectification is needed, it shall be put forward in written form and require immediate rectification. Internal inspection of construction quality requires inspection of quality certificates of installation materials and welding materials, welding procedure qualification report, nondestructive testing report of pipeline joints, purging of pipeline system and pressure test report.