December 2015 – Page 2 – Piping Components Supplier: Pipes, Fittings, Flanges, Fasteners and Valves

Ring Joint Facings for Class 150 ASME B16.5 Flanges

1. Technical drawings of ring joint facings for Class 150 ASME B16.5 Flanges.

2. Dimensions of ring joint facings for Class 150 Flange Joints and Groove.

NPS	Groove Number	P inch mm	E inch mm	F inch mm	R inch mm	K inch mm	S inch mm
1"	R15	1.875 47.63	0.250 6.35	0.344 8.74	0.03 0.8	2.5 63.5	0.16 4
1-1/4"	R17	2.250 57.15	0.250 6.35	0.344 8.74	0.03 0.8	2.88 73.0	0.16 4
1-1/2"	R19	2.562 65.07	0.250 6.35	0.344 8.74	0.03 0.8	3.25 82.5	0.16 4
2"	R22	3.250 82.55	0.250 6.35	0.344 8.74	0.03 0.8	4.00 102	0.16 4
2-1/2"	R25	4.000 101.6	0.250 6.35	0.344 8.74	0.03 0.8	4.75 121	0.16 4
3"	R29	4.500 114.3	0.250 6.35	0.344 8.74	0.03 0.8	5.25 133	0.16 4
3-1/2"	R33	5.188 131.78	0.250 6.35	0.344 8.74	0.03 0.8	6.06 154	0.16 4
4"	R36	5.875 149.23	0.250 6.35	0.344 8.74	0.03 0.8	6.75 171	0.16 4
5"	R40	6.750 171.45	0.250 6.35	0.344 8.74	0.03 0.8	7.62 194	0.16 4
6"	R43	7.625 193.68	0.250 6.35	0.344 8.74	0.03 0.8	8.62 219	0.16 4
8"	R48	9.750 247.65	0.250 6.35	0.344 8.74	0.03 0.8	10.75 273	0.16 4
10"	R52	12.000 304.80	0.250 6.35	0.344 8.74	0.03 0.8	13.00 330	0.16 4
12"	R56	15.000 381.00	0.250 6.35	0.344 8.74	0.03 0.8	16.00 406	0.16 4
14"	R59	15.625 396.88	0.250 6.35	0.344 8.74	0.03 0.8	16.75 425	0.12 3
16"	R64	17.875 454.03	0.250 6.35	0.344 8.74	0.03 0.8	19.00 483	0.12 3
18"	R68	20.375 517.53	0.250 6.35	0.344 8.74	0.03 0.8	21.50 546	0.12 3
20"	R72	22.000 558.80	0.250 6.35	0.344 8.74	0.03 0.8	23.50 597	0.12 3
24"	R76	26.500 673.10	0.250 6.35	0.344 8.74	0.03 0.8	28.00 711	0.12 3

1. NPS denotes nominal pipe size, P – pitch diameter, E – depth of the groove & height of the raised portion, F – top width of the groove, R – radius at bottom, K – diameter of raised portion, S – approximate distance between flanges. The 150# RTJ flange facings can be applied to various flange types including welding neck flange class 150, slip on flange 150#, Blind flange 150lb, etc.

2. All dimensions are provided in mm and inch unit. The depth of the groove, E, shall be furnished with the same dimension as the height of the raised portion. The groove number of ring joint facings for class 150 shall match the type R ring gaskets manufactured to ASME B16.20.

Ring Joint Facings for ASME B16.5 Flanges Classified by Classes
Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500

Flange Bolting for Class 150 ASME B16.5 Flanges

1. Technical drawings of flange bolting for Class 150 ASME B16.5 flanges.

machine bolt with nuts and stud bolt with nuts for class 150 flanges

flange bolting for class 150 - drilling templates — Drilling templates for asme b16.5 class 150 flanges

2. Dimension of flange bolting for Class 150 ASME B16.5 flanges.

NPS	O inch mm	W inch mm	m inch	n	d inch	L1 inch mm	L2 inch mm	L3 inch mm
1/2"	3.50 90	2.38 60.3	5/8	4	1/2	2.25 55	-	2.00 50
3/4"	3.88 100	2.75 69.6	5/8	4	1/2	2.50 65	-	2.00 50
1"	4.25 110	3.12 79.4	5/8	4	1/2	2.50 65	3.00 75	2.25 55
1 1/4"	4.62 115	3.50 88.9	5/8	4	1/2	2.75 70	3.25 85	2.25 55
1 1/2"	5.00 125	3.88 98.4	5/8	4	1/2	2.75 70	3.25 85	2.50 65
2"	6.00 150	4.75 120.7	3/4	4	5/8	3.25 85	3.75 95	2.75 70
2 1/2"	7.00 180	5.50 139.7	3/4	4	5/8	3.50 90	4.00 100	3.00 75
3"	7.50 190	6.00 152.4	3/4	4	5/8	3.50 90	4.00 100	3.00 75
3 1/2"	8.50 215	7.00 177.8	3/4	8	5/8	3.50 90	4.00 100	3.00 75
4"	9.00 230	7.50 190.5	3/4	8	5/8	3.50 90	4.00 100	3.00 75
5"	10.00 255	8.50 215.9	7/8	8	3/4	3.75 95	4.25 110	3.25 85
6"	11.00 280	9.50 241.3	7/8	8	3/4	4.00 100	4.50 115	3.25 85
8"	13.50 345	11.75 298.5	7/8	8	3/4	4.25 110	4.75 120	3.50 90
10"	16.00 405	14.25 362.0	1	12	7/8	4.50 115	5.00 125	4.00 100
12"	19.00 485	17.00 431.8	1	12	7/8	4.75 120	5.25 135	4.00 100
14"	21.00 535	18.75 476.3	1 1/8	12	1	5.25 135	5.75 145	4.50 115
16"	23.5 595	21.25 539.8	1 1/8	16	1	5.25 135	5.75 145	4.50 115
18"	25.00 635	22.75 577.9	1 1/4	16	1 1/8	5.75 145	6.25 160	5.00 125
20"	27.50 700	25.00 635.0	1 1/4	20	1 1/8	6.25 160	6.75 170	5.50 140
24"	32.00 815	29.50 749.3	1 3/8	20	1 1/4	6.75 170	7.25 185	6.00 150

1. NPS refers to Nominal Pipe Size, O – outside diameter of flange, W – Diameter of bolt circle, m – Diameter of bolt holes, n – number of bolts, d – diameter of bolts, L1 – length of stud bolts for 2 mm raised face, L2 – length of stud bolts for ring joint face, L3 – length of machine bolts for raised face.

2. The bolting of ASME B16.5 class 150 flanges can be furnished as machine bolt with nuts or stud bolts with nuts. Machine bolts shall be only used for flanges with raised face while stud bolts can be used for flanges with either raised face or ring joint face. All dimensions are provided in mm and inch units.

3. Contact our sales team for a quick quote: info@metalsflange.com

ASME B16.5 Flange Bolting Specification by Classes
Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500

ASME B16.5 Weld Neck Flanges 400LB

Technical drawing of ASME B16.5 weld neck flanges 400LB.

Weld Neck Flanges 400LB RF — The typical drawing of weld neck flanges 400LB with raised face according to ASME B16.5.

Dimension and weight specifications of ASME B16.5 Weld Neck flanges 400LB.

NPS	D inch mm	K inch mm	G inch mm	B inch mm	A inch mm	X inch mm	n	L inch	t inch mm	H inch mm	Wt. lbs kgs
1/2"	3.75 95	2.62 66.7	1.38 34.9	-	0.84 21.3	1.50 38	4	5/8	0.56 14.3	2.06 52	1.90 0.87
3/4"	4.62 115	3.25 82.6	1.69 42.9	-	1.05 26.7	1.88 48	4	3/4	0.62 15.9	2.25 57	3.20 1.45
1"	4.88 125	3.50 88.9	2.00 50.8	-	1.32 33.4	2.12 54	4	3/4	0.69 17.5	2.44 62	3.90 1.76
1-1/4"	5.25 135	3.88 98.4	2.50 63.5	-	1.66 42.2	2.50 64	4	3/4	0.81 20.7	2.62 67	5.50 2.49
1-1/2"	6.12 155	4.50 114.3	2.88 73.0	-	1.90 48.3	2.75 70	4	7/8	0.88 22.3	2.75 70	7.70 3.49
2"	6.50 165	5.00 127.0	3.62 92.1	-	2.39 60.3	3.31 84	8	3/4	1.00 25.4	2.88 73	9.60 4.36
2-1/2"	7.50 190	5.88 149.2	4.12 104.8	-	2.88 73.0	3.94 100	8	7/8	1.12 28.6	3.12 79	14.2 6.43
3"	8.25 210	6.62 168.3	5.00 127.0	-	3.50 88.9	4.62 117	8	7/8	1.25 31.8	3.25 83	18.8 8.53
3-1/2"	9.00 230	7.25 184.2	5.50 139.7	-	4.00 101.6	5.25 133	8	1	1.38 35.0	3.38 86	23.6 10.7
4"	10.00 255	7.88 200.0	6.19 157.2	-	4.50 114.3	5.75 146	8	1	1.38 35.0	3.50 89	28.2 12.8
5"	11.00 280	9.25 235.0	7.31 185.7	-	5.56 141.3	7.00 178	8	1	1.50 38.1	4.00 102	37.2 16.9
6"	12.50 320	10.62 269.9	8.50 215.9	-	6.63 168.3	8.12 206	12	1	1.62 41.3	4.06 103	48.5 22.0
8"	15.00 380	13.00 330.0	10.62 269.9	-	8.63 219.1	10.25 260	12	1-1/8	1.88 47.7	4.62 117	76.4 34.7
10"	17.50 445	15.25 387.4	12.75 323.8	-	10.75 273.0	12.62 321	16	1-1/4	2.12 54.0	4.88 124	107 48.5
12“	20.50 520	17.75 450.8	15.00 381.0	-	12.75 323.8	14.75 375	16	1-3/8	2.25 57.2	5.38 137	153 69.6
14”	23.00 585	20.25 514.4	16.25 412.8	-	14.00 355.6	16.75 425	20	1-3/8	2.38 60.4	5.88 149	210 95.5
16“	25.50 650	22.50 571.5	18.50 469.9	-	16.00 406.4	19.00 483	20	1-1/2	2.50 63.5	6.00 152	260 118
18”	28.00 710	24.75 628.6	21.00 533.4	-	18.00 457.0	21.00 533	24	1-1/2	2.62 66.7	6.50 165	319 145
20“	30.50 775	27.00 685.8	23.00 584.2	-	20.00 508.0	23.12 587	24	1-5/8	2.75 69.9	6.62 168	383 174
24”	36.00 915	32.00 812.8	27.25 692.2	-	24.00 610.0	27.62 702	24	1-7/8	3.00 76.2	6.88 175	553 251

(1) 400LB refers to Class 400 which is one of the pressure ratings stipulated by ASME B16.5. For dimensional denotation of D, K, G, t, H, A, X, n and L, please reference WN flanges Class 150. The welding end and flange facing(usually RF or RTJ) shall be furnished in accordance with ASME B16.5.

(2) The raised face of weld neck flanges 400LB shall be furnished with a height of 7 mm. All dimensions are provided in both metric and imperial units except for the bolt hole dimensions. Each value of the two systems shall be used separately. The bore diameter B shall be specified by the purchaser. Sizes from NPS 1/2 to NPS 3-1/2 has exactly the same dimensions as that of weld neck flanges 600LB (Class 600).

Weight Calculation of Weld Neck Flanges

Weld Neck flanges, also know as “WN flanges” or “Welding Neck flanges”, are widely used in oil and gas industry, steam piping and offshore platforms. Sometimes, it is necessary to know the weight of a weld neck flange in piping design. Instead of querying the experimental data from flange manufacturers, theoretical weight can be calculated directly. The weight calculation of weld neck flanges is based on the geometrical or mathematical modeling of the flange.

The typical drawing of weld neck flanges

Mathematical Modeling for weight calculation of weld neck flanges

The typical drawing is for weld neck flanges in accordance with ASME B16.5. The welding end is furnished with beveling for wall thickness from 5 mm to 22 mm (inclusive). And the flange has raised face (RF).

All the dimensions are covered by the standard specification: H – the overall length through hub of weld neck flanges; T – minimum thickness of the flange; t – the height of raised face(2mm for Class 150 and 300, 7mm for Class 400 600, 900, 1500 and 2500); D – outside diameter of the flange; K – diameter of bolt circle; G – outside diameter of the raised face; B – bore diameter of weld neck flanges which is in accordance with ASME B36.10; A – hub diameter at the beginning of chamfer of welding neck flanges; X- root diameter of the hub; n – number of bolts; L – diameter of bolt holes.

Mathematical modeling for weight calculation of weld neck flanges

As illustrated in above drawing, geometrically the weld neck flange can be divided into 4 parts.

Part I can be treated as a short length of pipe. According to ASME B16.5, the straight length is furnished in 10 mm. Hence the weight of Part I can be calculated by using the weight-calculation formula of pipe:
W₁ = 0.0246615 * (A – T_k) * T_k * 0.01 T_k– wall thickness of the mating pipe.

Part II can be treated as a truncated cone deducted by a cylinder. Its weight can be calculated as:
W₂ = {1/3 * π * (H – T – t – 0.01) * [(X/2)² + (A/2)² + X*A/4)] – 1/4 * π * B² * (H – T – t – 0.01)} * ρ

Part III is a cylinder deducted by several small cylinders(bolt holes and bore):
W₃ = 1/4 * π * (D² – B² – n*L²) * T * ρ

Part IV, the raised face, can be treated as a cylinder deducted by another cylinder(bore):
W₄ = 1/4 * π * (G² – B²) * t * ρ

The total weight of the weld neck flange is W = W₁ + W₂ + W₃ + W₄

ASME B16.5 Weld Neck Flanges 300LB

Technical drawing of ASME B16.5 weld neck flanges 300LB.

Weld Neck Flanges 300LB RF — The typical drawing for WN RF flanges Class 300 according to ASME B16.5.

Dimension and weight specifications of ASME B16.5 Weld Neck flanges 300LB.

NPS	D inch mm	K inch mm	G inch mm	B inch mm	A inch mm	X inch mm	n	L inch	t inch mm	H inch mm	Wt. lbs kgs
1/2"	3.75 95	2.62 66.7	1.38 34.9	0.62 15.8	0.84 21.3	1.50 38	4	5/8	0.50 12.7	2.00 51	1.70 0.75
3/4"	4.62 115	3.25 82.6	1.69 42.9	0.82 20.9	1.05 26.7	1.88 48	4	3/4	0.56 14.3	2.19 56	2.82 1.27
1"	4.88 125	3.50 88.9	2.00 50.8	1.05 26.6	1.32 33.4	2.12 54	4	3/4	0.62 15.9	2.38 60	3.50 1.52
1-1/4"	5.25 135	3.88 98.4	2.50 63.5	1.38 35.1	1.66 42.2	2.50 64	4	3/4	0.69 17.5	2.50 64	4.50 2.03
1-1/2"	6.12 155	4.50 114.3	2.88 73.0	1.61 40.9	1.90 48.3	2.75 70	4	7/8	0.75 19.1	2.63 67	6.40 2.89
2"	6.50 165	5.00 127.0	3.62 92.1	2.07 52.5	2.38 60.3	3.31 84	8	3/4	0.81 20.7	2.69 68	7.50 3.40
2-1/2"	7.50 190	5.88 149.2	4.12 104.8	2.47 62.7	2.88 73.0	3.94 100	8	7/8	0.94 23.9	2.94 75	11.40 5.17
3“	8.25 210	6.62 168.3	5.00 127.0	3.07 77.9	3.50 88.9	4.62 117	8	7/8	1.06 27.0	3.06 78	15.3 6.93
3-1/2”	9.00 230	7.25 184.2	5.50 139.7	3.55 90.1	4.00 101.6	5.25 133	8	7/8	1.12 28.6	3.13 79	19.1 8.67
4“	10.00 255	7.88 200	6.19 157.2	4.03 102.3	4.50 114.3	5.75 146	8	7/8	1.19 30.2	3.32 84	24.7 11.2
5”	11.00 280	9.25 235.0	7.31 185.7	5.05 128.2	5.56 141.3	7.00 178	8	7/8	1.31 33.4	3.82 97	33.3 15.1
6“	12.50 320	10.62 269.9	8.50 215.9	6.07 154.1	6.63 168.3	8.12 206	12	7/8	1.38 35.0	3.82 97	42.4 19.1
8”	15.00 380	13.00 330.2	10.62 269.9	7.98 202.7	8.63 219.1	10.25 260	12	1	1.56 39.7	4.32 110	65.9 29.9
10“	17.50 445	15.25 387.4	12.75 323.8	10.02 254.6	10.75 273.0	12.62 321	16	1-1/8	1.81 46.1	4.56 116	94.1 42.7
12”	20.50 520	17.75 450.8	15.00 381.0	12.00 304.8	12.75 323.8	14.75 375	16	1-1/4	1.94 49.3	5.06 129	136.2 61.9
14“	23.00 585	20.25 514.4	16.25 412.8	-	14.00 355.6	16.75 425	20	1-1/4	2.06 52.4	5.56 141	189 85.8
16”	25.50 650	22.50 571.5	18.50 469.9	-	16.00 406.4	19.00 483	20	1-3/8	2.19 55.6	5.69 144	234 106
18“	28.00 710	24.75 628.6	21.00 533.4	-	18.00 457.0	21.00 533	24	1-3/8	2.31 58.8	6.19 157	289 131
20”	30.50 775	27.00 685.8	23.00 584.2	-	20.00 508.0	23.12 587	24	1-3/8	2.44 62.0	6.32 160	348 158
24“	36.00 915	32.00 812.8	27.25 692.2	-	24.00 610.0	27.62 702	24	1-5/8	2.69 68.3	6.56 167	507 230

(1) 300LB refers to Class 300 which is one of the pressure ratings stipulated by ASME B16.5. Dimensions D, B, t and H refer to the basic flange dimensions: D – outside diameter of flange, B – bore diameter of weld neck flange, t – minimum thickness of flange, H – length through hub of weld neck flange. n, L and K refer to the bolting drilling dimensions of flange: n – number of bolts, L – diameter of bolt holes, K – diameter of bolt circle. G denotes the outside diameter of raised face. A and X are dimensions associated with the hub: A – diameter at the top of hub, X – diameter at the root of hub. A is the same as the nominal outside diameter of the pipe connected to the flange.

(2) Usually two types of welding ends can be furnished according to different wall thickness of the pipe. The bore diameters of weld neck flanges 300LB correspond to the inside diameters of pipe as given in ASME B36.10 for standard(STD) wall pipe. Thickness of standard wall is the same as SCH40 in sizes 10″ and smaller. These bore sizes are furnished unless otherwise specified by the purchaser. Besides, bore diameters of 14″ and larger shall be specified by the purchaser. Ring joint facing (RTJ) is also available upon request. All tolerances shall be in accordance with ASME B16.5.

(3) The raised-face length(2 mm) of Weld neck flanges 300LB is the same as that of weld neck flanges 150LB. All dimensions are provided in both metric and imperial units except for the bolt hole dimensions. Each value of the two systems shall be used separately.