If the bending radius of a elbow is not specified, is it assumed to be the long radius or the short radius by default?
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In practical applications, when the bending radius of an elbow is not specified, it is generally assumed to be the long radius – this is also the practice followed by elbow manufacturers. However, according to GB/T12459-2017, the short radius does not need to be indicated; therefore, the long radius must be specified. If the bending radius is not stated, it is assumed to be the short radius. Is this correct?
According to GB/T12459-2017, the long radius is denoted by EL, while the short radius is indicated by ES. There are default size series.
No. In accordance with the GB/T12459-2017 standard, if the bending radius of a elbow is not specified, it is assumed to be the long radius by default. If a elbow with a short radius is required, it should be specified explicitly in the drawings or order. Therefore, when the bend radius is not specified, a long radius is used by default. .
Find an article by Guo Xianshun, the main author of the GB 12459 standard, that discusses the precautions for purchasing pipe fittings. Regarding the default behavior for long radii and short radii, it seems I haven’t found any information in GBT 12459-2017 (I think the same is true for me); if anyone has found such information, please let me know.
Does the standard specify whether the default should be a long radius or a short radius? ? You can’t just say it out of thin air; there must be a basis for it
Except that socket-welded elbows are not marked, butt-welded elbows are all marked, and specifications such as R=1.5DN are also indicated.
That’s the rule set by our design institute
Label them using the component codes specified in the standards, and there will be no problems. There is no specific component code in the American standards; therefore, the first letter of the common term is used to represent the name, along with descriptions such as R=1.5D or 1.0D, as well as indications of whether the component is seamless or welded. This helps to avoid errors during procurement and installation. The component codes in the national standards have been clearly specified for you.
The design documents should specify that purchases shall be made in accordance with the provisions outlined in those documents