ASME B16.48 Class 600

Pipe flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification.

A figure-8 blank (also called a Spectacle Blind Flange) is a pressure-retaining plate with one solid end and one open end connected with a web or tie bar.

NPS	Inside Diameter, B	Outside Diameter, O	Centerline Dimension, A	Thick-ness, t	Web Width, W		Approximate Weight kgs
1/2	16	51	65	6.4	38	7	0.67
3/4	21	64	80	6.4	38	7	1.04
1	27	70	90	6.4	57	7	1.28
1 1/4	37	79	100	9.7	57	7	1.78
1 1/2	43	92	115	9.7	67	7	2.42
2	55	108	125	9.7	57	7	3.07
2 1/2	67	127	150	12.7	67	7	4.79
3	83	146	170	12.7	67	7	6.13
3 1/2	96	159	185	15.7	76	7	7.89
4	108	191	215	15.7	76	7	11.50
5	135	238	265	19.1	86	7	19.80
6	162	264	290	22.4	86	7	25.77
8	212	318	350	28.4	95	7	41.75
10	265	397	430	35.1	105	7	74.93
12	315	454	490	41.1	105	7	107.25
14	346	489	525	44.5	114	7	130.32
16	397	562	605	50.8	124	7	190.96
18	448	610	655	53.8	133	7	229.02
20	497	679	725	63.5	133	7	324.54
24	597	787	840	73.2	152	7	477.35