Stainless steel pipeline system common sense
The raw materials commonly used in pipes are: plates, pipes and forges.
Board materials: Common boards include rolling plates, flat plates, and opening tablets. The coil plates are usually delivered in rolls. The advantage is that the length can be arbitrarily intercepted according to needs. The disadvantage is that there must be a corresponding opening of the roll. Delivery, the advantage is that the plate surface is flat, which is convenient for transportation. The disadvantage is that sometimes the use of the plate is low. The open tablet is made of the rolled plate into a piece of the plate. The method of the tablet, in addition to observing its surface and edge flat integration, smoothness, there is also a simple method: real tablets, each one has the labels when the steel mill is leaving the factory, such as manufacturers, specifications, steel numbers, etc. There are no these marks.
Carbon steel plate weight = length*wide*thick*7.85/106 (mm is unit, weight is kg)
Stainless steel plate weight = length*wide*thick*7.91/106 (mm is unit, weight is kilograms)
Round Tube: This mainly refers to the circular pipe, which can be divided into welded pipes (straight seam welded pipes, spiral welded pipes) and seamless pipes. The welded pipe (also known as a seam tube) is usually used for low pressure (20kg/cm2), of which spiral The welded pipe is mainly used for large -caliber (such as DN400 or more) systems, so its wall thickness is generally thin (usually below SCH10).
Seamless pipes are generally used for high -pressure pipelines. Due to the limited production process of seamless pipes, the industrial seamless pipes we commonly use are usually made of hot rolling. Therefore For a certain caliber pipe, there are usually a certain lower limit (generally above SCH10),
This is as: φ27-φ48 wall thickness ≥2.0 φ57-φ76 wall thickness ≥3.0 φ89-φ159 wall thickness ≥3.5 φ168-φ219 wall thickness ≥4.0 (φ168*3 market, but less) φ273 wall thickness ≥6.0 φ377377 Wall thickness ≥8.0 φ402-φ426 wall thickness ≥9.0 φ530-φ630 wall thickness ≥10.0
The formula for calculating the theoretical weight per meter of the pipe is: carbon steel management weight = (outer classic-wall thickness)*wall thickness*0.02466 (mm is unit, the weight is pound)
Stainless steel management weight = (outer menstrual-wall thickness)*wall thickness*0.02491 (mm is unit, weight is kg))
6 meters One weight = 52.81*6 = 316.86kg (3) forging: Forging parts are usually used to make flanges, plug -in and certain connections.
3.2 Express the tube diameter and wall thickness:
(1) The simplest and clear representation method is: the actual outer diameter of the pipeline*actual wall thickness, for example: φ114.3*6.02 means that the outer diameter of the pipeline is 114.3mm and the wall thickness is 6.02mm. However, in many cases, in order to facilitate the design, the pipeline's caliber is mostly represented by the nominal diameter, such as DN100, 4 ". The wall thickness tube slogan SCH ×× is expressed. Wall thickness, they are just a logo. Due to the habits of countries in the world, a certain nominal diameter (such as DN100) indicates that the actual outer diameter is not unique. For the A series, the exterior diameter of the pipeline is 114.3mm. If the B series is used, the exterior diameter is 108mm. However, the DN100A represents 114.3 and DN100B. The tube marks (such as SCH20, STD, XS), query the relevant forms in the relevant standards, can find the actual wall thickness it represents.
(2) Some old design departments still use such habits, which is expressed in DN ×× as the public system (B series), and the English system is expressed in the inch (A series). However, according to the current actual situation, the latter situation, that is, "when the nominal diameter is represented by inch, generally represents the British series (A series)" is usually correct, but the previous situation is no longer accurate. The more popular approach is. Regardless of the public British system, it is represented by DN ××. Therefore, anyone who expresses the diameter with DN ×× and does not indicate the A series and B series must be clearly clarified that the pipeline series uses it, otherwise, errors may occur.
(3) For the common specifications of pipelines, please refer to Table 3 for details. The detailed introduction, the nominal diameter, the actual outer diameter (divided into A series, B series), and the actual wall thickness corresponding to different tube marks (such as SCH30, STD).