Ask questions about the wall thickness of pipeline procurement
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Now we need to purchase a batch of pipeline fittings. The information we have now: Nominal diameter (1/2"~3"), material (ST20), manufacturing (seamless), wall thickness (SCH40, SCH80), standard number (GB/T8163) Please tell me: 1. Submit the above information to the manufacturer for purchase. Is the information enough? 2. Especially regarding the thickness of pipes, such as SCH80, can the manufacturer determine the specific pipe thickness based on SCH80? Other: Know all the parameters such as the working medium, pressure, temperature and so on of the pipe. Please tell me what inquiry materials I need to prepare to complete the procurement of pipelines and pipe fittings for a project. What I want to know most, now that I know the above information, how to determine the thickness of the pipe (specifically how many mm)? Thanks! This post was last edited by zyucao on 2009-4-20 10:25 ]
The pipe table number (Sch) is used to indicate the wall thickness series specified in the American ANSI B36.10 standard and is applicable to welded steel pipes and seamless steel pipes. The pipe table number (Sch) is the ratio of the design pressure to the allowable stress of the material at the design temperature multiplied by 1000 and rounded to obtain the value Sch = p / K * 1000 P----Design pressure, Mpa ； K----The allowable stress of the material at the design temperature, Mpa. The pipe table number (Sch) is not the wall thickness value, but is related to the wall thickness. For pipes of the same diameter, each table number has a corresponding wall thickness value. The pipe number can be used to calculate the design pressure adapted to a certain design temperature, that is, P = Sch * K / 1000 From the above formula, the design pressure of pipes with the same material, the same temperature and the same gauge number is the same --------- The ordering content is specified in gb8163: 1 Standard number 2 Product name 3 Steel grade 4 Dimensions and specifications 5 Order quantity (meters or tons) 6 Delivery status 7 Special requirements -------------------------- We are installing in a pharmaceutical factory. Generally, the outer diameter is commonly used. * wall thickness: 25 * 2.5,32 * 3,38 * 3,45 * 3.5,57 * 3.5,76 * 4,89 * 4,108 * 4.5,133 * 4.5,159 * 5,219 * 6,273 * 6. The inquiry information is the execution standard of the pipe, specifications, wall thickness, freight, and please note that the price is by meter. * Theoretical weight is used to calculate tonnage, or weigh, because the pipe has upper and lower allowable deviations, and that’s about it.
"Nominal diameter (1/2"~3"), material (ST20), manufacturing (seamless), wall thickness (SCH40, SCH80), standard number (GB/T8163)" are submitted to the manufacturer for purchase, and the information is complete. The thickness of the pipe can be found in the "Seamless and welded steel pipe size selection series for chemical piping (HG20553-93)" according to the nominal diameter and wall thickness (SCH40, SCH80).