When pipe fittings such as elbows and flanges from the installation company arrive, what needs to be checked?

The LZ seemed to have discussed this issue before; please check: http://bbs.hcbbs.com/viewthread.php?tid=411904

Material certification, certificate of conformity, and quality specification from the manufacturer are required

There is a difference. This focuses on the inspection upon arrival.

Check the packing documents against the supply list specified in the contract, and verify the specifications, quantities, models, materials, etc； At the same time, its appearance quality and other aspects should also be primarily checked. For reference!

It is necessary to check whether the quality certification documents are complete, whether the actual quantity received matches the delivery list, whether the material, bending radius, wall thickness or flange neck thickness meet the specified requirements, whether the positive and negative deviations are within the limits allowed by the standards, and whether the markings regarding pressure and material are clear and complete.

Are all the documents complete (material certification, certificate of conformity, warranty letter, delivery note, etc.?), and does the material list match the items purchased? Material quality inspection: Check whether the pipe end matches the diameter of the pipeline, whether it is round, whether the wall thickness meets the required standards, whether the angle is correct, and whether there are any defects in appearance such as cracks or pitting.

This post was last edited by lypcx on 2009-6-20 at 11:28. What was said on floor 7 is already very good; you can also use various direct-reading instruments for testing, such as optical spectroscopes, hardness testers, thickness gauges, etc., to determine the composition and parameters of metals

Check whether the external dimensions meet the technical requirements and relevant specifications, verify that the material meets the specified standards, inspect for any defects on the surface, and require the provision of quality certificates, approval documents, and other related materials.

The commonly used specifications for pipeline construction and acceptance include: (1) GB50236－98 \"Specifications for Construction and Acceptance of Welded Works of Field Equipment and Industrial Pipelines\", (2) GB50235－97 \"Specifications for Construction and Acceptance of Industrial Metal Pipeline Works\", (3) SH3501－97 \"Specifications for Construction and Acceptance of Pipeline Works for Highly Toxic and Flammable Media in the Petrochemical Industry\", (4) GB50184－93 \"Quality Inspection and Evaluation Standards for Industrial Metal Pipeline Works\", (5) SHJ517－91 \"Construction Technology Standards for Steel Pipeline Works in the Petrochemical Industry\", (6) GBJ126－89 \"Specifications for Construction and Acceptance of Insulation Works for Industrial Equipment and Pipelines\", (7) HGJ229－91 \"Specifications for Construction and Acceptance of Anti-corrosion Works for Chemical Equipment and Pipelines\", (8) SHJ22－90 \"Specifications for Anti-corrosion Design and Construction of Coatings on Equipment and Pipelines in Petrochemical Enterprises\"

After acceptance, focus on quality aspects such as material and the presence of manufacturing defects, as well as other factors like thickness and pressure rating.

This post was last edited by yxbj on 2009-6-20 at 17:41. Two main items are to be checked: 1. Whether the quantity of items matches the packing list, and whether there are any obvious surface defects； 2. Whether all types of documents are complete. Parameters such as voltage resistance can only be checked after installation.

What the original poster said is spot on; checking anything else is purely a waste of time and unnecessary