Regarding the selection of pipe wall thickness tables
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Which table should be used as the reference for pipe wall thickness? 1. So far I have found two tables that list the different pipe wall thickness grades; are there any others? How many such tables exist in total, and what are the names of the most commonly used ones? 2. How should one choose among all these tables for wall thicknesses? Under what circumstances should 20533 be used, and under what circumstances should ANSI be used?
1. The wall thickness of pipes is usually determined in accordance with international or **standards; common standards include ASME B36.10, ASME B36.19, etc. These standards list the specifications for pipes of different diameters and wall thicknesses. The specific standard to choose usually depends on the purpose of the pipeline, its operating conditions, as well as the relevant regulations and standards in the region. 2. As for when to choose the 20533 standard or the ANSI standard, it generally depends on several factors such as the operating environment of the pipeline, the working pressure and temperature, and whether imports are involved. For example, ANSI (American **standards**) are typically used in projects that comply with American engineering standards. If the project is located within China or requires compliance with Chinese installation and operation standards, it may be more advisable to choose Chinese standards such as GB 20533. It is recommended to select the appropriate standard based on specific project requirements and local regulations. In uncertain situations, it is possible to consult professional pipeline engineers or relevant industry standard organizations. .
You can also calculate it by yourself. Calculations are carried out in accordance with the pressure resistance formula in Chapter 6 of GB 50316-2000 (2008 edition), \"Code for Design of Industrial Metal Piping\".
The pipe wall thickness is determined by the designer. The contractor is supposed to build according to the plans; then why is the question asked about how to choose the wall thickness?
The difference between 20553 (from ISO4200) and ANSI lies not only in the wall thickness but also in the outer diameter. In pipeline design, the outer diameter system must be determined first (including ISO, ANSI, and metric pipe series); the outer diameters vary among these series. Once the outer diameter series is chosen, the wall thickness is selected according to the respective standard specifications.
Not to mention foreign standards – even among the several domestic standards such as SH, HG, GB, and JB, the outer diameters vary. Each standard has its own outer diameter specification, and although they are all referred to as DN, the actual outer diameters differ; there has been no standardization over the years. For now, it’s sufficient to require design institutes to standardize each project during the design phase.
Check the pipe material sheet; it contains information on the wall thickness. The technical specifications will also state the relevant standards. Otherwise, look at the pipe manual, as it will indicate the standards that are being used. If that doesn’t work, just send an email to the designers and ask them for answers.