Pipe Flanges Technical Information Hochdruckfl nsche Flange Tube Connections We suggest that where applicable tubing to the following standards should be utilised Seamless precision steel tube to DIN2391, material grade C, ST 37-4 or ST 52-4. Seamless boiler tube to DIN 2441 groups 1 & 2, material grade ST 37-4 or ST 52-4. Tubing according to ASA B36-10. We suggest the use of tubing to the following dimensions: Size Tubes to DIN 2391 Tubes to DIN 2448 Tubes to ASA B 36-10 Series Series Series 100bar 160bar 250bar 315bar 400bar 250bar 400bar Schedule 250 Schedule 400 1/ 2" 15 x 1 18 x 1 18 x 1.5 16 x 2.0 20 x 2.5 16 x 2.5 20 x 3 16 x 3 20 x 3.5 21.3 x 2.6 21.3 x 3.2 40 21.3 x 2.8 80 21.3 x 3.7 3/ 4" - - 25 x 3 25 x 3.5 25 x 4 26.9 x 2.6 26.9 x 4 40 26.7 x 2.9 80 26.7 x 3.9 1" 28 x 2 - 28 x 3 30 x 4 30 x 5 30 x 6 33.7 x 4 33.7 x 6.3 40 33.7 x 4.8 160 33.7 x 6.4 11/ 4" 35 x 2 - 35 x 4 38 x 5 38 x 6 38 x 7 42.4 x 5 42.4 x 6.3 80 42.4 x 4.8 160 42.4 x 6.4 11/ 2" 42 x 3 - 42 x 5 50 x 6 50 x 8 50 x 9 48.3 x 5 48.3 x 8 80 48.3 x 5.1 160 48.3 x 7.1 2" - - - 65 x 8 65 x 10 60.3 x 6.3 60.3 x 10 160 60.3 x 8.7 200 60.3 x 11.1 21/ 2" - - - 80 x 10 80 x 12.5 76.1 x 8 76.1 x 12.5 160 73 x 9.5 200 73 x 14 3" - - - - - 88.9 x 10 88.9 x 16 160 88.9 x 11.1 200 88.9 x 15.2 31/ 2" - - - - - 101.6 x 10 101.6 x 16 - - - - 4" - - - - - 114.3 x 12.5 114.3 x 20 160 114.3 x 13.5 200 114.3 x 17.1 2 Size A B 3/ 8" 17.12 2.62 1/ 2" 18.66 3.53 3/ 4" 25.00 3.53 1" 32.92 3.53 11/ 4" 37.70 3.53 11/ 2" 47.22 3.53 2" 56.75 3.53 21/ 2" 69.45 3.53 3" 85.32 3.53 31/ 2" 98.02 3.53 4" 110.72 3.53 5" 136.12 3.53 Seal Material The standard o-ring seal material is Buna (90 shore). However Viton (85 - 90 shore) is available as an option on request. For all SAE flanges and Cetop flanges the o-ring dimensions are according to the following table - O-Rings for use with SAE Flanges
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