This standard replaces JB 86-59. JB/T 86.2-1994 Concave and convex steel pipe flange cover JB/T86.2-1994 Standard download and decompression password: www.bzxz.net
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Machinery Industry Standard of the People's Republic of China Mountain raised surface steel pipe flange cover 1·Subject content and scope of application JB/T 86.2..94 Replaces JB8659 This standard specifies the type and size of flange covers for concave and convex steel pipes with a nominal pressure PN of 4.0.6.3.10.0MPa. This standard is applicable to concave and convex steel pipes with a nominal pressure PN4.0~10.0MPa. Flange cover. 2 Quoted standards JB/T74 pipe flange technical conditions 3 The type and size of the joint cover should comply with the regulations in Figure 1 and Tables 1 to 3. Type A Type B D Figure 1 4 The technical requirements for these covers are in accordance with the provisions of JB/T74. 5. The nominal pressure of the flange cover and the maximum allowable working pressure at different temperatures are in accordance with the provisions of JB/T74. 6 Marking example Raised surface steel pipe flange cover with nominal diameter 300mm, nominal pressure 4.0MPa, size series 2: flange cover 300-40AJB/T86.2-94 nominal Concave steel pipe flange cover with diameter 300mm, nominal pressure 4.0MPa, size Series 1: Flange cover 300-40B (Series 1) JB/T86.2--94 Ministry of Machinery Industry of the People's Republic of China 1994-12-09 Approved for implementation on 1995-10.01 399 nominal path DN 10 15 20|| tt||25 32 40 50 65 80 100 125||tt| |150 Flange outer diameter Series 17 Series 2 ++? 90 95 105 1.15 140/135 150/145 165/160 1857180 200/195 JB/T86.2—94 Table 1 PN4.0MPa concave and convex steel pipe flange cover dimensions connection ruler pavilion bolt hole center circle diameter|| tt||K 60 65 75 85 100 110 125||tt| |145 160 235/230 270 300 (175) 200 (225) 250 300 350 400 3501 375 415 450/445 515/510 580/570 660/655 400 190 220 250|| tt||295 320 355 385 450 510 585 bolt hole||tt ||Diameter Bolt Thread Th. Quantity Series 1/ Series 2 14 14 14 14 18 18 18 18 18 23 26/25 26/25||tt ||30 30 34 34 34 36/34 41 4||tt ||4 4 4 4 4 4 8 8 8 8 8 12 12 12 12 Series 1/ Series 2 M12 M12 M12 M12 M16 M16 M16 M16 M16 M20 X Sealing surface size Flange Thickness Series d Series 1 Series 2 Series” 40 45 55 165 78||tt ||85 100 120 135 160 188 M24/M22 218||tt ||M24/M22 M27 M27 M30 M30 16 16 16||tt ||M30 258 282 315 345 408 M33/M30465 M36||tt ||535 34 39 50 57 65 75 87 109 120 149 175 203 233 259 286 312| |tt||363 421 473 35 40 51 58 66||tt ||76 88 11.0 121 150 176 204 234 260 287 313 364 422 474 2 2 2| |tt||4 4 24 2 3 3 4 4||tt ||134 3 4.5 3 3 3 3 4.5 4.5 4.5 4.5 4.5 4.5 16 16 16 16| |tt||16 16 18 20 mm Flange theoretical quality ky : Type A 0.48 (0.55 0,82 I 1.68 1.97 2.74||tt ||3. 4.97 22 24 28 30 34 38||tt| |40 -4 4.5 5 50 56 64 7.42 10.60 14.40 27.10 41.80 60.90 type 0. 3 ).60||tt ||0.86 1.05 1.77 1.96 2.72 3.68 4.83 7.14 10.20 13.80 26.00 40.41 58.50 81.60 85.30! 121.00f16.8 141. 00 1 134. 51. tt||15 20 系列17 系系2