1. The quality inspection of DSAW pipe shall be carried out under the technical quality supervision of the supplier.


2. The supplier must ensure that the delivery of the DSAW pipe meets the specifications of the corresponding product standards. The supplier has the right to inspect and verify the corresponding product standards.


3. DSAW pipelines shall be submitted for inspection in batches, and batch processing rules shall conform to the corresponding product standards.


4. DSAW Pipeline Inspection Items, Sampling Quantity, Sampling Components and Test Methods shall be carried out in accordance with the corresponding product standards.


5. DSAW pipeline test results, a rule that does not meet product standards should be unqualified selection, and from the same batch of DSAW pipelines take double the number of samples, re-evaluation of unqualified projects. The results of the re-inspection (including any requirements for the project test) failed and a batch of dsaws could not be delivered. The following inspection items are not allowed to be re-examined if they are not qualified: a. There are white spots in low magnification tissues and bay microstructures.


6. For non-conforming test results (including those with initial test results of microstructural failure, which are not allowed to be re-examined), root canal examinations should be submitted, and heat treatment from the head (the number of times of heat treatment from the head) should be carried out through a new batch of examinations.


7. If there is no curiosity rule in the product standard, the chemical composition of the tube is checked by the melting assembly.