ASME/ANSI B16.5 Class 900 TH

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.

Threaded (Screwed) flange is similar to the Slip-On flange, but the bore is threaded. Its chief merit is that it can be assembled withour welding, explaining its use in low pressure services at ordinary atmospheric temperatures, and in highly explosive areas where welding create a hazard.

Nominal Pipe Size	Outside Diameter of Flange	Diameter of Raised Face	Thickness of Flanges Min.	Diameter of Hub	Length Through Hub	Thread Length Threaded Min.	Bore	Counter-bore Threaded Flange, Min.,	Diameter of Bolt Circle	Diameter of Bolt Holes	Number of Bolts	Approxi-mate Weight kgs
NPS	O	R	tf	X	Y	T	B	Q	W	I	n
1/2	120	34.9	22.3	38	32	23	22.2	23.6	82.6	22.2	4	1.73
3/4	130	42.9	25.4	44	35	26	27.7	29.0	88.9	22.2	4	2.33
1	150	50.8	28.6	52	41	29	34.5	35.8	101.6	25.4	4	3.48
1 1/4	160	63.5	28.6	64	41	31	43.2	44.4	111.1	25.4	4	4.00
1 1/2	180	73.0	31.8	70	44	32	49.5	50.3	123.8	28.6	4	5.54
2	215	92.1	38.1	105	57	39	61.9	63.5	165.1	25.4	8	9.79
2 1/2	245	104.8	41.3	124	64	48	74.6	76.2	190.5	28.6	8	13.82
3	240	127.0	38.1	127	54	42	90.7	92.2	190.5	25.4	8	11.51
4	290	157.2	44.5	159	70	48	116.1	117.6	235.0	31.8	8	19.52
5	350	185.7	50.8	190	79	54	143.8	144.4	279.4	34.9	8	32.14
6	380	215.9	55.6	235	86	58	170.7	171.4	317.5	31.8	12	41.04
8	470	269.9	63.5	298	102	64	221.5	222.2	393.7	38.1	12	70.97
10	545	323.8	69.9	368	108	72	276.2	276.2	469.9	38.1	16	100.32
12	610	381.0	79.4	419	117	77	327.0	328.6	533.4	38.1	20	133.26
14	640	412.8	85.8	451	130	83	359.2	360.4	558.8	41.3	20	152.57
16	705	469.9	88.9	508	133	86	410.5	411.2	616.0	44.5	20	185.15
18	785	533.4	101.6	565	152	89	461.8	462.0	685.8	50.8	20	256.28
20	855	584.2	108.0	622	159	93	513.1	512.8	749.3	54.0	20	315.13
24	1040	692.2	139.7	749	203	102	616.0	614.4	901.7	66.7	20	603.79