Instructions for inspection of national standard steel belt bellows, key points for acceptance of bidding pipes

In the field of plastic pipeline engineering, the compliance testing of national standard steel belt bellows and the acceptance of pipes in the bidding stage are the core links to control the quality of the project and avoid the risks in the later stage. Practitioners need to strictly follow the relevant specifications.

Three things need to be paid attention to in the inspection process: First, sample preparation, representative pipes of the same batch, same specification and no damage need to be selected, usually 3 sections of 1 meter long samples are intercepted according to the standard requirements, and the factory inspection report, product certificate and other qualification documents are carried to ensure that the samples submitted for inspection are consistent with the pipes used in the project; second, the test items are clear, and the core indicators stipulated in the national standard need to be covered, including ring stiffness, impact performance, peel strength, sealing performance, etc., to avoid missing key test items; third, sample protection, fixed and cushioned during transportation to prevent the pipe from bumping and deforming, affecting the accuracy of the test data, and truthfully inform the testing agency of the relevant information of the samples during inspection to ensure the compliance of the testing process.

The acceptance of bidding pipes needs to grasp five key points: first, qualification verification, check whether the production license, type inspection report and other documents provided by the supplier are within the valid period and match the batch of pipes supplied; second, appearance inspection, check one by one whether there are cracks, bubbles, impurities and other defects on the surface of the pipe, whether the identification is clear and complete, including specifications, standard numbers, production dates and other information; third, size calibration, use professional measurement tools to detect pipe diameter, wall thickness, wave distance and other parameters to confirm compliance with the national standard size deviation requirements; fourth, sampling re-inspection, according to the specified proportion of samples to be sent to the third party authority for testing, focusing on the verification of ring stiffness and other key indicators that affect the pressure bearing capacity of the pipeline; fifth, record and archive, organize and retain the various data and materials in the acceptance process, and sign After confirmation, a complete acceptance file is formed as the basis for traceability of project quality.

Strict implementation of the inspection and acceptance points can effectively ensure the quality compliance of the national standard steel belt bellows and lay a solid foundation for the long-term stable operation of the pipeline project.