ASME B16.48 Class 300

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	2	0.36
3/4	21	64	80	6.4	38	2	0.56
1	27	70	90	6.4	38	2	0.68
1 1/4	42	79	100	6.4	38	2	0.79
1 1/2	48	92	115	6.4	38	2	1.06
2	61	108	125	9.7	51	2	1.75
2 1/2	73	127	150	9.7	51	2	2.44
3	89	146	170	9.7	64	2	3.16
3 1/2	102	162	185	12.7	64	2	4.55
4	114	178	200	12.7	64	2	5.38
5	141	213	235	15.7	76	2	8.84
6	168	248	270	15.7	76	2	11.75
8	219	305	330	22.4	76	2	22.79
10	273	359	385	25.4	102	2	33.66
12	324	419	450	28.4	102	2	49.81
14	356	483	515	31.8	108	2	75.75
16	406	536	570	38.1	108	2	107.21
18	457	594	630	41.1	114	2	139.16
20	508	651	685	44.5	121	2	177.28
24	610	772	810	50.8	140	2	278.46