The outer diameter of dn50 is the nominal diameter. Dn50 = outer diameter - 2* wall thickness. DN is the nominal diameter, DN100 is the nominal diameter of the steel pipe is 100 mm.
The value behind the DN is rounded. The tube of the DN100 does not mean that the diameter of the tube is 100mm (usually the outer diameter of the tube of the DN100 is 114mm, the inner diameter of the tube is 95mm. However, the definition of the DN is different in some corporate standards. Our company's DN Defined as the nominal diameter, it is a value between the nominal diameter outer diameter and the nominal diameter inner diameter. The DN100 tube is also called a four-inch tube.
Answer two:
DN50 does not actually refer to steel pipes, but to flanges that are fitted with pipes!
The DN50 flange bore is fitted with a steel pipe with a nominal outside diameter of 57. No matter how thick the wall thickness of this steel pipe is, it has only the difference in bore diameter and the outside diameter is all 57.
The same: DN15 flange with nominal diameter 18mm steel pipe.
DN20 flange with a nominal diameter of 25mm steel pipe.
DN25 flange with nominal diameter 32mm steel pipe.
DN40 flange with a nominal diameter 45mm steel pipe.
DN50 flange with a nominal diameter of 57mm steel pipe.
DN80 flange with a nominal diameter of 89mm steel pipe.
The DN100 flange has a nominal outside diameter of 109mm.
The rest will not be listed one by one.
On weekdays, it is called "2 muscle thin muscles (18) ping-pumps, 7-guns, ping-pumps, S (18), ping-pong, and frequency-reversing/FONT."
The value behind the DN is rounded. The tube of the DN100 does not mean that the diameter of the tube is 100mm (usually the outer diameter of the tube of the DN100 is 114mm, the inner diameter of the tube is 95mm. However, the definition of the DN is different in some corporate standards. Our company's DN Defined as the nominal diameter, it is a value between the nominal diameter outer diameter and the nominal diameter inner diameter. The DN100 tube is also called a four-inch tube.
Answer two:
DN50 does not actually refer to steel pipes, but to flanges that are fitted with pipes!
The DN50 flange bore is fitted with a steel pipe with a nominal outside diameter of 57. No matter how thick the wall thickness of this steel pipe is, it has only the difference in bore diameter and the outside diameter is all 57.
The same: DN15 flange with nominal diameter 18mm steel pipe.
DN20 flange with a nominal diameter of 25mm steel pipe.
DN25 flange with nominal diameter 32mm steel pipe.
DN40 flange with a nominal diameter 45mm steel pipe.
DN50 flange with a nominal diameter of 57mm steel pipe.
DN80 flange with a nominal diameter of 89mm steel pipe.
The DN100 flange has a nominal outside diameter of 109mm.
The rest will not be listed one by one.
On weekdays, it is called "2 muscle thin muscles (18) ping-pumps, 7-guns, ping-pumps, S (18), ping-pong, and frequency-reversing/FONT."
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