Dimensions Weld Neck & Slip-On flanges BS 3293 Class 300

Foreword

NPS	O	B1	C	Y2/Y1	A	X1
26	971.5	666.7	79.4	184.1	666.7	687.4
28	1035.0	717.6	85.7	196.8	717.5	739.7
30	1092.2	768.3	92.1	209.5	768.3	792.2
32	1149.3	819.1	98.4	222.2	819.1	844.6
34	1206.5	869.9	101.6	231.8	871.5	896.9
36	1270.0	920.7	104.8	241.3	922.3	949.3

NPS	X	R	NBH	DBH	D	r
26	720.7	749.3	28	44.4	876.3	9.53
28	774.7	800.1	28	44.4	939.8	11.11
30	827.2	857.2	28	47.6	996.9	11.11
32	881.1	914.4	28	50.8	1054.1	11.11
34	936.6	965.2	28	50.8	1104.9	12.7
36	990.6	1022.3	32	54.0	1168.4	12.7

Indications..

• NPS = Nominal Pipe Size
• O = Outside Diameter of Flange
• B1 = Flange Bore Slip-On
• C = Thickness of Flange Min
• Y2/Y1 = Weld Neck / Slip-On Overall Length
• A = Weld Neck Diameter at Weld Bevel
• X1 = Slip on Hub Diamameter at Small End
• X = Weld Neck / Slip-On Hub Diameter
• R = Raised Face (O.D.) Outside Diameter
• NBH = Number of Bolt Holes
• DBH = Diameter of Bolt Holes
• r = Fillet Radius
• D = Diameter of Bolt Circle
• B2 = To be specified by purchaser
• Rf = Class 150-300 Rf height 1.6mm
  Class 400-600 Rf height 6.35mm

Weights of Class 300 Weld Neck & Slip-On flanges

NPS	Weld Neck kg	Slip-On kg
26	279	251
28	340	313
30	390	354
32	435	395
34	504	460
36	560	513

Note..

• Weights are based on manufacturer's data and are approximate

Ring Joint Facings BS 3293

NPS	Ring No.	Raised Face O.D.	Groove			Weights in Kg Weld Neck Slip-On
		R	K	L	M	Cl 300	Cl 400	Cl 600
26	R93	809.6	749.3	12.7	19.8	298 270	349 304	446 417
28	R94	860.4	800.1	12.7	19.8	360 333	409 364	518 482
30	R95	917.6	857.2	12.7	19.8	412 376	465 419	570 537
32	R96	984.2	914.4	14.3	23.0	465 425	539 482	697 622
34	R97	1035.0	965.2	14.3	23.0	536 492	608 540	735 670
36	R98	1092.2	1022.3	14.3	23.0	595 548	689 621	800 764

Indications..

• NPS = Nominal Pipe Size
• R = Raised Face (O.D.) Outside Diameter
• K = Pitch Diameter
• L = Groove Depth
• M = Groove Width
• r = Corner radius at bottom of groove 1.6 mm max

Dimensions and Tolerances BS 3293

TYPE OF FLANGES	INDICATIONS	TOL
Weld Neck and Slip-On flanges	Raised face diameter	±0.40
	Flange thickness	+4.76 -0
	Overall length	±3.18
	Outside diameter at welding end of weld neck hub	+3.97 -0.79
	Inside diameter of weld neck flange	+3.18 -1.59
	Inside diameter of slip on flange	+1.59 -0
Ring Joint Facing on Weld Neck and Slip-On flanges	Depth of groove	+0.40 -0
	Width of groove	±0.20
	Pitch diameter of groove	±0.13

General note..

• All dimensions above are in millimeters unless otherwise indicated.