Help: Are there any manufacturers in China that can roll steel plates with small diameters? Any knowledgeable friends, please help me out.
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This is to ensure consistency with the inner diameter of the external pipeline, which is made of pipeline steel and consists of a different material. Therefore, our equipment requires a thicker structure; it can only be made by rolling steel plates, as the cost of forging components is too high.
Isn’t it better to use seamless steel pipes for small-diameter tubes?
Since it is necessary to ensure the same inner diameter, seamless steel pipes do not have corresponding sizes.
This post was last edited by AtlantisH on 2024-3-12 at 14:46. Is it a pig receiving and sending device for long-distance pipeline stations? It’s sufficient to use seamless steel pipes; the inner diameter of these pipes varies in different areas. For example, the strength design coefficients differ between zone 2 and zone 3, which may also result in different wall thicknesses, yet they can still be used for ball passing. Moreover, the thickness can be calculated using the same formula as that for long-distance pipelines, in accordance with NB/T 10616-2021 \"Cleaner Receiving and Sending Devices\".
Yes, it’s a device for the serving and receiving cylinders. In foreign projects, the clients are quite strict, emphasizing the need to ensure consistent inner diameters. We have now provided the corresponding response; it is no problem for the ball to pass through with a radius difference of 2mm. But currently, for example, the size and thickness of the external pipeline is 6.35, while the wall thickness of my ball receiving and sending cylinder needs to be 12.7 in order to fit through; there’s a huge difference between these values.
So what should be done? Domestic bidding documents also require that the inner diameters be consistent, but that requirement has never been enforced. Long-distance pipelines are designed without considering a corrosion margin, while the equipment requires a corrosion margin of around 2 mm; therefore, the final diameter is determined based on what is necessary, and there is no requirement for the inner diameters to be identical. The wall thickness difference is so large; is it because of different materials?
When pipes cannot be made in that way, forgings are usually used; if the length is too great, several forged sections are combined together
Yes, different materials result in different wall thicknesses; if the materials are the same, then the wall thicknesses will be identical.
It’s for an overseas project – why worry about such a small amount of money? It can’t be that expensive anyway. The forgings we use here are of much better quality
I’m not very familiar with manufacturers of steel plates for small-diameter pipes, but you can contact Qingdao Wu Xiao (I’ve sent you a private message); they are capable of pressing steel plates into pipes, and the specific diameter available can be determined according to the customer’s requirements. You’ll need to find out more about that.