Solid Weld Neck Flanges

Type and Construction
The solid weld neck flanges are in accordance with EEMUA 234, Section 3 for 16 and 20 bar systems. The range of sizes covered is ½ in./ 16 mm to 36 in./914 mm Class 150. Other sizes are available on request. Drilling and outside diameter dimensions of flange sizes ½ in./16 mm-24 in./610 mm are in accordance with ANSI B16.5 and BS 1560, whereas the larger sizes, 28 in./711 mm -36 in./914 mm are in accordance with MSS SP-44. The recommended bolting is in accordance with ASTM B150 alloy UNS C63000.

Dimensions
Dimensions are based on EEMUA -234, Section 3, Table 3.2-3.3.

Tolerances
The tolerances are based on EEMUA – 234, Section 3, Table 3.4.

							16 bar	20 bar	16 bar	20 bar	16 bar	20 bar
Nominal Size	O.D. of Flange	Thickn. of Flange	Dia of Hub	Hub dia at weld Chamfer	Length Through Hub	Bore of Flange	Thickn. of Hub at Welding End	Approx. Weight	Parallel Length of Hub	Dia of Bolt Circle	Drilling	Dia of Bolt Holes
		D	b	d₆	d₃	H	d₇	d₇	S₁ min	S₁ min			h	K	No. Of Bolts	d2
in	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	kg	kg	mm	mm		mm
½	16	89	14	23	16	48	u s e 2 0 b a r	12.00	u s e 2 0 b a r	2.0	u s e 2 0 b a r	0.7	8	60.3	4	15.9
¾	25	98	16	32	25	52	21.00	2.0	1.0	7	69.8	4	15.9
1	30	108	16	42	30	56	25.00	2.5	1.3	8	79.4	4	15.9
1¼	38	117	17	51	38	57	33.03	2.5	1.7	8	88.9	4	15.9
1½	44.5	127	20	61	44.5	62	39.53	2.5	2.3	7	98.4	4	15.9
2	57	152	25	73	57	64	52.16	2.5	4.1	9	120.6	4	19.0
2½	76.1	178	27	91	76.1	70	71.23	2.5	6.1	8	139.7	4	19.0
3	88.9	190	27	105	88.9	70	84.08	2.5	7.1	8	152.4	4	19.0
4	108	229	27	135	108	76	102.13	3.0	10.2	8	190.5	8	19.0
6	159	279	27	192	159	89	153.75	152.38	3.0	3.5	15.5	15.8	8	241.3	8	22.2
8	219.1	343	31	246	219.1	98	211.10	210.10	4.0	4.5	27.7	28.0	8	298.4	8	22.2
10	267	406	31	305	267	98	257.97	255.93	4.5	5.5	38.5	39.3	8	362.0	12	25.4
12	323.9	483	35	365	323.9	98	312.83	309.74	5.5	7.0	61.6	62.9	8	431.8	12	25.4
14	368	533	41	400	368	99	354.22	351.00	6.5	8.0	86.8	88.4	8	476.2	12	28.6
16	419	597	43	457	419	106	404.17	399.84	7.0	9.0	114.2	115.6	8	539.8	16	28.6
18	457.2	635	45	505	457.2	113	441.50	438.50	8.0	9.5	136.0	140.7	8	577.8	16	31.8
20	508	698	45	559	508	118	490.50	486.50	8.5	11.0	164.6	168.4	8	635.0	20	31.8
24	610	813	49	664	610	137	589.50	584.50	10.5	13.0	247.7	253.7	8	749.3	20	34.9
28	711	927	72	748	711	145	687.50	681.40	12.0	15.0	453.0	461.1	8	864.0	28	34.9
32	813	1060	72	876	813	160	786.50	779.50	13.5	17.0	599.0	611.1	8	978.0	28	41.1
36	914	1168	72	984	914	175	883.50	876.50	15.5	19.0	741.0	755.7	8	1086.0	32	41.1

It should be noted that although these flanges are flat faced, inside bolt circle gaskets shall be used and special care should be taken to avoid overtightening the bolting.

PIEPES