How should pipes, fittings, and steel sections be inspected?
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How should pipes, fittings, and steel sections be inspected? We are the project owner; the pipeline systems, fittings, steel sections, bolts, gaskets, and such are purchased by the construction company. How should we conduct inspections to prevent the construction company from substituting inferior materials with higher-quality ones in order to make a profit?
For carbon steel, the main tasks are to measure the thickness and check the appearance for any deformation； For other types of steel, in addition to those, the construction party will also need to conduct spectroscopic analysis; ask them for it promptly. If you have your own spectrometer, you can use it to conduct the tests as well.
Check the certificate of conformity, material test reports, dimensions, thickness, markings, and conduct spectroscopy analysis
We generally follow a few steps: 1. Material inspection, including certificates of conformity, factory certificates, furnace numbers, batch information, as well as the quantity specified in the contract； 2. Visual inspection: dimensions, wall thickness, surface flatness, manufacturer’s stamp, etc. 3. Physical and chemical tests. Material analysis, hardness, tensile testing, deformation, etc. For bulk critical materials, on-site supervision during production can be considered.
When doing EPC, since the P has been given to the construction contractor, I think we should first follow these steps； 1. Thoroughly review the shortlist of manufacturers, requiring them to provide PO, TBE, and FAT. 2. After the products leave the factory, they are inspected in accordance with relevant standards; the appropriate instruments are used for this purpose. The products must come with certificates of conformity, material sheets, batch numbers, and so on. 3. Check the relevant properties listed on the material sheet and certificate, such as tensile strength, hardness, yield strength, etc. 4. Basic visual inspection ；