Some steel pipe on the knowledge of the spiral steel pipe

Spiral steel pipe weld seams Spiral steel pipe seams are longer than straight seam pipes. If the pipe length is L, the length of the weld seam is L/cos. The spiral steel pipe and straight seam pipe that have been debated for a long time, especially those who are superior to UOE steel pipe. Spiral steel pipe manufacturing technology developed to today, we should be comprehensive and correct evaluation and comparison, re-understanding of the longer spiral welded steel pipe. The outer diameter of the pipe of the spiral steel pipe is indicated by the letter D, followed by the size and wall thickness of the outer diameter. For example, the seamless pipe with an outer diameter of 108, the wall thickness is 5mm, and is represented by D108*5. The plastic pipe is also With the outer diameter, such as De63, other such as reinforced concrete pipe, cast iron pipe, galvanized pipe, etc., are represented by DN, and the nominal diameter is generally used in the design drawings. The nominal diameter is for convenience of design and manufacture and maintenance. A standard, also known as the nominal diameter, is the specification of the tube (or fitting).
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