Municipal project carat tube inspection process and qualification information

Preparation for Municipal Carat Tube Inspection

Before the municipal project carat tube enters the market, it is necessary to complete the pre-inspection preparation according to the batch: every 100 tons of carat tubes of the same specification, the same raw material, and the same production process are divided into an inspection batch, and less than 100 tons are also calculated according to the independent batch. Before sampling, it is necessary to check the product factory test report and raw material traceability certificate. Priority is given to selecting pipe sections with no damage, no deformation, and flat incision as samples. Samples for testing ring stiffness and ring flexibility need to be intercepted from a 1-meter standard section. Samples for testing tensile and impact properties need to be reserved according to the requirements of the testing agency to avoid re-inspection due to irregular sampling.

On-site inspection process and precautions

After the sampling is completed, it is necessary to submit an application for inspection to the project supervisor first, attaching the corresponding batch of product list and factory information. The supervisors will witness the sampling process and seal the samples together. The batch, specifications, sampling date, and sampling person information will be clearly marked on the sample packaging, and then sent to a municipal engineering testing agency with CMA qualifications. Routine testing items need to cover five categories: ring stiffness, ring flexibility, drop weight impact performance, creep ratio, and interface sealing performance. If the project involves special application scenarios, additional testing items can be added according to the design requirements. All inspection process records need to be kept synchronously as supporting materials for completion acceptance.

List of necessary qualification materials for inspection

The first type is the basic product information, including the factory quality certificate, the factory performance test report, the raw material traceability record, and the product specification parameter description; the second type is the inspection process information, including the witness sampling confirmation sheet, the inspection application sheet, the sample sealing certificate, and the receipt receipt of the testing agency; the third type is the acceptance supporting materials, including the entry acceptance record, the construction installation log, and the previous interface sealing test records. All materials need to be stamped with the confirmation official seal of the construction party and the supervisor. The photocopy needs to be marked "consistent with the original" and the original should be kept for future inspection.

Common inspection problems to avoid points

There are differences in the acceptance standards of different municipal projects. Drainage and sewage projects need to be tested for corrosion resistance, and rainwater storage projects need to be tested for frost resistance and impact resistance. Before submitting for inspection, the inspection items need to be checked against the project design documents in advance to avoid process rework due to missing items. If there are unqualified items in the first test, double sampling and re-inspection are required immediately. All batches that still fail the re-inspection need to be withdrawn. It is strictly forbidden for unqualified products to flow into the construction process to avoid hidden dangers of engineering quality in the later stage.