What are large outer diameter, small outer diameter, and Series A and Series B? What is the reason for such differences between them?
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What are large outer diameter, small outer diameter, and Series A and Series B? What is the reason for such differences between them?
Differences among pipe series standards: In China, two types of pipe series standards are commonly used: SH3405 belongs to the \"large outer diameter series\", while HG20553 is divided into Series A and Series B; Series A falls under the \"large outer diameter series\" and Series B belongs to the \"small outer diameter series\""
It refers to the series of pipes used; in China, the B series was commonly used in the past, while in Europe and America the A series is more common. Due to these differences in series, there are slight variations in the flanges used – that is, some JB or GB type flanges come in different sizes in terms of outer diameter. For reference.
The pipes have a dimensional deviation; Series A is designed with a positive deviation, while Series B has a negative deviation.
The standards for the use of pipes around the world can be broadly divided into two categories: ◆ Pipes – that is, steel pipe outer diameters are classified into internationally standard series (large outer diameter series) and imperial pipes, which are also commonly referred to as Series A； The commonly used domestic series (small outer diameter series) is also often referred to as the (B series) metric pipes (or meter-scale pipes). This post was last edited by huangying1978 on 2009-4-29 13:45.]
Some are labeled Series I and Series II
For example: For DN150 pipes, some have an outer diameter of 168 and others have an outer diameter of 159; is it A or B?
168 is Series A, and 159 is Series B. I recommend that you check 20553 online; it shows the wall thicknesses corresponding to two different nominal diameters for each series. Page 1 of 20801 explains the differences between Series A and Series B. Series A is for US standards, while Series B is for EU standards. In China, the B series is generally used; the outer diameter and wall thickness are usually integers, with the wall thickness being determined by designers through rounding calculations. For the A series, many of the outer diameters and wall thicknesses are decimal values; to be more precise, the wall thicknesses follow a systematic pattern. I’m not sure if I understand correctly; just for reference.