Flanges

“When you buy something from us, we ensure that it will perform as you expect.”

What is Flange?

Flanges are relatively simple mechanical connectors that have been used successfully for high-pressure piping applications. Pipe flanges have flush or flat surfaces that are perpendicular to the pipe to which they attach. Two of these surfaces are mechanically joined via bolts, collars, adhesives or welds. In addition, the moment-carrying capacity of flanges is significant compared to other mechanical connectors. This is an important feature for systems that experience pipe-walking or lateral buckling from temperature and pressure variations (e.g. deep water lines). Flanges can be designed to meet a wide range of application requirements such as high-temperature and corrosion resistance.

Type	Pressure Capacity	Pipe Sizes	Applications / Advantages
Lap joint	Low	All	Systems requiring frequent disassembly
Slip-on	Low	All	Low installation cost, simple assembly
Socket weld	High	Small	Smooth bore for better fluid flow
Threaded	Low	Small	Attachment without welding
Welding neck	High	All	High pressures and extreme temperatures
Blind	Very high	All	Closing pipes, flow pressure testing

Technical Details

NPS	NPS	O	tf	tf	X	Ah	Y	Y	Y	T	Q	B	B	B	r	D	R	Tr	W	d	n
1 ⁄ 2	15	90	9.6	11.2	30	21.3	16	16	48	16	. . .	22.2	22.9	15.8	3	10	34.9	2	60.3	15.9	4
3 ⁄ 4	20	100	11.2	12.7	38	26.7	16	16	53	16	. . .	27.7	28.2	20.9	3	11	42.9	2	69.9	15.9	4
1	25	110	12.7	14.3	49	33.4	16	17	56	18	. . .	34.5	34.9	26.6	3	13	50.8	2	79.4	15.9	4
1 1 ⁄ 4	30	117	14.3	15.9	59	42.2	18	21	58	21	. . .	43.2	43.7	35.1	5	14	63.5	2	88.9	15.9	4
1 1 ⁄ 2	40	127	15.9	17.5	65	48.3	23	22	62	23	. . .	49.5	50	40.9	6	16	73	2	98.4	15.9	4
2	50	152	17.5	19.1	78	60.3	26	25	64	26	. . .	61.9	62.5	52.5	8	17	92.1	2	120.7	19	4
2 1 ⁄ 2	60	180	20.7	22.3	90	73	29	29	70	29	. . .	74.6	75.4	62.7	8	19	104.8	2	139.7	19	4
3	80	190	22.3	23.9	108	88.9	31	30	70	31	. . .	90.7	91.4	77.9	10	21	127	2	152.4	19	4
3 1 ⁄ 2	90	215	22.3	23.9	122	101.6	32	32	72	32	. . .	103.4	104.1	90.1	10	22	139.7	2	177.8	19	8
4	100	230	22.3	23.9	135	114.3	34	33	77	34	. . .	116.1	116.8	102.3	11	24	157.2	2	190.5	19	8
5	125	255	22.3	23.9	164	141.3	37	36	89	37	. . .	143.8	144.4	128.2	11	24	185.7	2	215.9	22.2	8
6	150	280	23.9	25.4	192	168.3	40	40	89	40	. . .	170.7	171.4	154.1	13	27	215.9	2	241.3	22.2	8
8	200	345	27	28.6	246	219.1	45	44	102	45	. . .	221.5	222.2	202.7	13	32	269.9	2	298.5	22.2	8
10	250	406	28.6	30.2	305	273	50	49	102	50	. . .	276.2	277.4	254.6	13	33	323.8	2	362	25.4	12
12	300	485	30.2	31.8	365	323.8	56	56	115	56	. . .	327	328.2	304.8	13	40	381	2	431.8	25.4	12
14	350	535	33.4	35	400	355.6	58	79	127	58	. . .	359.2	360.2	336.5	13	41	412.8	2	476.3	28.6	12
16	400	597	35	36.6	457	406.4	64	87	127	64	. . .	410.5	411.2	387.3	13	44	469.9	2	539.8	28.6	16
18	450	635	38.1	39.7	505	457	59	97	140	69	. . .	461.8	462.3	438.1	13	49	533.4	2	577.9	31.7	16
20	500	700	41.3	42.9	559	508	73	103	145	73	. . .	513.1	514.4	488.9	13	54	584.2	2	635	31.7	20
24	600	815	46.1	47.7	663	610	83	111	153	83	. . .	616	616	590.5	13	64	692.2	2	749.3	34.9	20

NPS	NPS	O	tf	tf	X	Ah	Y	Y	Y	T	Q	B	B	B	r	D	R	Tr	W	d	n
1/2	15	95	12.7	14.3	38	21.3	23	22	53	16	23.6	22.2	22.9	15.8	3	10	34.9	2	66.7	15.9	4
3/4	20	117	14.3	15.9	48	26.7	26	25	58	16	29	27.7	28.2	20.9	3	11	42.9	2	82.6	19	4
1	25	125	15.9	17.5	54	33.4	27	27	62	18	35.8	34.5	34.9	26.6	3	13	50.8	2	88.9	19	4
1 1/4	30	135	17.5	19.1	64	42.2	27	27	66	21	44.4	43.2	43.7	35.1	5	14	63.5	2	98.4	19	4
1 1/2	40	155	19.1	20.7	70	48.3	31	30	69	23	50.3	49.5	50	40.9	6	16	73	2	114.3	22.2	4
2	50	165	20.7	22.3	84	60.3	34	33	70	29	63.5	61.9	62.5	52.5	8	17	92.1	2	127	19	8
2 1/2	60	190	23.9	25.4	100	73	39	38	77	32	76.2	74.6	75.4	62.7	8	19	104.8	2	149.2	22.2	8
3	80	210	27	28.6	117	88.9	43	43	80	32	92.2	90.7	91.4	77.9	10	21	127	2	168.3	22.2	8
3 1/2	90	230	28.6	30.2	133	101.6	45	44	81	37	104.9	103.4	104.1	90.1	10	22	139.7	2	184.2	22.2	8
4	100	255	30.2	31.8	146	114.3	48	48	86	37	117.6	116.1	116.8	102.3	11	24	157.2	2	200	22.2	8
5	125	280	33.4	35	178	141.3	51	51	99	43	144.4	143.8	144.4	128.2	11	24	185.7	2	235	22.2	8
6	150	320	35	36.6	206	168.3	53	52	99	47	171.4	170.7	171.4	154.1	13	27	215.9	2	269.9	22.2	12
8	200	381	39.7	41.3	260	219.1	62	62	112	51	222.2	221.5	222.2	202.7	13	32	269.9	2	330.2	25.4	12
10	250	445	46.1	47.7	321	273	67	95	118	56	276.2	276.2	277.4	254.6	13	33	323.8	2	387.4	28.6	16
12	300	520	49.3	50.8	375	323.8	73	102	131	61	328.6	327	328.2	304.8	13	40	381	2	450.8	31.7	16
14	350	585	52.4	54	425	355.6	77	111	143	64	360.4	359.2	360.2	336.5	13	41	412.8	2	514.4	31.7	20
16	400	650	55.6	57.2	483	406.4	83	121	146	69	411.2	410.5	411.2	387.3	13	44	469.9	2	571.5	34.9	20
18	450	711	58.8	60.4	533	457	89	130	159	70	462	461.8	462.3	438.1	13	49	533.4	2	628.6	34.9	24
20	500	775	62	63.5	587	508	96	140	162	74	512.8	513.1	514.4	488.9	13	54	584.2	2	685.8	34.9	24
24	600	915	68.3	69.9	702	610	107	152	169	83	614.4	616	616	590.5	13	64	692.2	2	812.8	41.3	24

NPS	NPS	O	tf	tf	X	Ah	Y	Y	Y	T	Q	B	B	B	r	D	R	Tr	W	d	n
1/2	15	95	14.3	14.3	38	21.3	29	22	59	16	23.6	22.2	22.9	15.8	3	10	34.9	7	66.7	15.9	4
3/4	20	117	15.9	15.9	48	26.7	32	25	64	16	29	27.7	28.2	20.9	3	11	42.9	7	82.6	19	4
1	25	125	17.5	17.5	54	33.4	34	27	69	18	35.8	34.5	34.9	26.6	3	13	50.8	7	88.9	19	4
1 1/4	30	135	20.7	20.7	64	42.2	36	29	74	21	44.4	43.2	43.7	35.1	5	14	63.5	7	98.4	19	4
1 1/2	40	155	22.3	22.3	70	48.3	39	32	77	23	50.6	49.5	50	40.9	6	16	73	7	114.3	22.2	4
2	50	165	25.4	25.4	84	60.3	44	37	80	29	63.5	61.9	62.5	52.5	8	17	92.1	7	127	19	8
2 1/2	60	190	28.6	28.6	100	73	48	41	86	32	76.2	74.6	75.4	62.7	8	19	104.8	7	149.2	22.2	8
3	80	210	31.8	31.8	117	88.9	53	46	90	35	92.2	90.7	91.4	77.9	10	21	127	7	168.3	22.2	8
3 1/2	90	230	35	35	133	101.6	56	49	93	40	104.9	103.4	104.1	90.1	10	22	139.7	7	184.2	25.4	8
4	100	275	38.1	38.1	152	114.3	61	54	108	42	117.6	116.1	116.8	102.3	11	24	157.2	7	215.9	25.4	8
5	125	330	44.5	44.5	189	141.3	67	60	121	48	144.4	143.8	144.4	128.2	11	24	185.7	7	266.7	28.6	8
6	150	355	47.7	47.7	222	168.3	74	67	124	51	171.4	170.7	171.4	154.1	13	27	215.9	7	292.1	28.6	12
8	200	420	55.6	55.6	273	219.1	83	76	140	58	222.2	221.5	222.2	202.7	13	32	269.9	7	349.2	31.7	12
10	250	510	63.5	63.5	343	273	93	111	159	66	276.2	276.2	277.4	254.6	13	33	323.8	7	431.8	34.9	16
12	300	560	66.7	66.7	400	323.8	99	117	163	70	328.6	327	328.2	304.8	13	40	381	7	489	34.9	20
14	350	605	89.9	89.9	432	355.6	101	127	172	74	360.4	359.2	360.2	336.5	13	41	412.8	7	527	38.1	20
16	400	685	76.2	76.2	495	406.4	113	140	185	78	411.2	410.5	411.2	387.3	13	44	469.9	7	203.2	41.3	20
18	450	745	86.2	86.2	546	457	124	152	191	80	462	461.8	462.3	438.1	13	49	533.4	7	654	44.4	20
20	500	815	88.9	88.9	610	508	134	165	197	83	512.8	513.1	514.4	488.9	13	54	584.2	7	723.9	44.4	24
24	600	940	101.6	101.6	718	610	147	184	210	93	614.4	616	616	590.5	13	64	692.2	7	838.2	50.8	24

NPS	NPS	O	tf	tf	X	Ah	Y	Y	Y	T	Q	B	B	B	r	D	R	Tr	W	d	n
1/2	15	120	22.3	22.3	38	21.3	39	32	67	23	23.6	22.2	22.9	15.8	3	10	34.9	7	82.6	22.2	4
3/4	20	130	25.4	25.4	44	26.7	42	35	77	26	29	27.7	28.2	20.9	3	11	42.9	7	88.9	22.2	4
1	25	150	28.6	28.6	52	33.4	48	41	80	29	35.8	34.5	34.9	26.6	3	13	50.8	7	101.6	25.4	4
11/4	30	160	28.6	28.6	64	42.2	48	41	80	31	44.4	43.2	43.7	35.1	5	14	63.5	7	111.1	25.4	4
11/2	40	180	31.8	31.8	70	48.3	51	44	90	32	50.6	49.5	50	40.9	6	16	73	7	123.8	28.6	4
2	50	215	38.1	38.1	105	60.3	64	57	109	39	63.5	61.9	62.5	52.5	8	17	92.1	7	165.1	25.4	8
21/2	60	245	41.3	41.3	124	73	71	64	112	48	76.2	74.6	75.4	62.7	8	19	104.8	7	190.5	28.6	8
3	80	241	38.1	38.1	127	88.9	61	54	109	42	92.2	90.7	91.4	77.9	10	21	127	7	190.5	25.4	8
4	100	292	44.5	44.5	159	114.3	77	70	121	48	117.6	116.1	116.8	102.3	11	24	157.2	7	235	31.7	8
5	125	350	50.8	50.8	190	141.3	86	79	134	54	144.4	143.8	144.4	128.2	11	24	185.7	7	279.4	34.9	8
6	150	381	55.6	55.6	235	168.3	93	86	147	58	171.4	170.7	171.4	154.1	13	27	215.9	7	317.5	31.7	12
8	200	470	63.5	63.5	298	219.1	109	114	169	64	222.2	221.5	222.2	202.7	13	32	269.9	7	393.7	38.1	12
10	250	546	69.9	69.9	368	273	115	127	191	72	276.2	276.2	277.4	254.6	13	33	323.8	7	469.9	38.1	16
12	300	610	79.4	79.4	419	323.8	124	143	207	77	328.6	327	328.2	304.8	13	40	381	7	533.4	38.1	20
14	350	641	85.8	85.8	451	355.6	137	156	220	83	360.4	359.2	360.2	336.5	13	41	412.8	7	558.8	41.3	20
16	400	705	88.9	88.9	508	406.4	140	165	223	86	411.2	410.5	411.2	387.3	13	44	469.9	7	616	44.4	20
18	450	787	101.6	101.6	565	457	159	190	236	89	462	461.8	462.3	438.1	13	49	533.4	7	685.8	50.8	20
20	500	857	108	108	622	508	166	210	255	93	512.8	513.1	514.4	488.9	13	54	584.2	7	749.3	54	20
24	600	1041	139.7	139.7	749	610	210	267	299	102	614.4	616	616	590.5	13	64	692.2	7	901.7	66.7	20

NPS	NPS	O	tf	tf	X	Ah	Y	Y	Y	T	Q	B	B	B	r	D	R	Tr	W	d	n
1/2	15	120	22.3	22.3	38	21.3	39	32	67	23	23.6	22.2	22.9	15.8	3	10	34.9	7	82.6	22.2	4
3/4	20	130	25.4	25.4	44	26.7	42	35	77	26	29	27.7	28.2	20.9	3	11	42.9	7	88.9	22.2	4
1	25	150	28.6	28.6	52	33.4	48	41	80	29	35.8	34.5	34.9	26.6	3	13	50.8	7	101.6	25.4	4
1 1/4	30	160	28.6	28.6	64	42.2	48	41	80	31	44.4	43.2	43.7	35.1	5	14	63.5	7	111.1	25.4	4
1 1/2	40	180	31.8	31.8	70	48.3	51	44	90	32	50.6	49.5	50	40.9	6	16	73	7	123.8	28.6	4
2	50	215	38.1	38.1	105	60.3	64	57	109	39	63.5	61.9	62.5	52.5	8	17	92.1	7	165.1	25.4	8
2 1/2	60	245	41.3	41.3	124	73	71	64	112	48	76.2	74.6	75.4	62.7	8	19	104.8	7	190.5	28.6	8
3	80	267	47.7	47.7	133	88.9	80	73	124	. . .	. . .	90.7	91.4	77.9	10	21	127	7	203.2	31.7	8
4	100	311	54	54	162	114.3	97	90	131	. . .	. . .	116.1	116.8	102.3	11	24	157.2	7	251.3	34.9	8
5	125	375	73.1	73.1	197	141.3	112	105	163	. . .	. . .	143.8	144.4	128.2	11	24	185.7	7	292.1	41.3	8
6	150	395	82.6	82.6	229	168.3	126	119	178	. . .	. . .	170.7	171.4	154.1	13	27	215.9	7	317.5	38.1	12
8	200	485	92.1	92.1	292	219.1	150	143	220	. . .	. . .	221.5	222.2	202.7	13	32	269.9	7	393.7	44.4	12
10	250	585	108	108	368	273	185	178	251	. . .	. . .	276.2	277.4	254.6	13	33	323.8	7	482.6	50.8	12
12	300	675	123.9	123.9	451	323.8	226	219	290	. . .	. . .	327	328.2	304.8	13	40	381	7	571.5	54	16
14	350	750	133.4	133.4	495	355.6	248	241	305	. . .	. . .	359.2	360.2	336.5	13	41	412.8	7	635	60.6	16
16	400	825	146.1	146.1	552	406.4	267	260	318	. . .	. . .	410.5	411.2	387.3	13	44	469.9	7	704.8	66.7	16
18	450	915	162	162	597	457	283	276	334	. . .	. . .	461.8	462.3	438.1	13	49	533.4	7	774.7	73	16
20	500	985	177.8	177.8	641	508	299	292	363	. . .	. . .	513.1	514.4	488.9	13	54	584.2	7	831.8	79.4	16
24	600	1 170	203.2	203.2	762	610	337	330	413	. . .	. . .	616	616	590.5	13	64	692.2	7	990.6	92.1	16

NPS	NPS	O	tf	tf	X	Ah	Y	Y	Y	T	Q	B	B	B	r	D	R	Tr	W	d	n
1/2	15	135	30.2	30.2	43	21.3	47	40	80	29	23.6	22.2	22.9	15.8	3	10	34.9	7	88.9	22.2	4
3/4	20	140	31.8	31.8	51	26.7	50	43	86	32	29	27.7	28.2	20.9	3	11	42.9	7	95.2	22.2	4
1	25	160	35	35	57	33.4	55	48	96	35	35.8	34.5	34.9	26.6	3	13	50.8	7	108	25.4	4
1 1/4	30	185	38.1	38.1	73	42.2	59	52	102	39	44.4	43.2	43.7	35.1	5	14	63.5	7	130.2	28.6	4
1 1/2	40	205	44.5	44.5	79	48.3	67	60	118	45	50.6	49.5	50	40.9	6	16	73	7	146	31.7	4
2	50	235	50.9	50.9	95	60.3	77	70	134	51	63.5	61.9	62.5	52.5	8	17	92.1	7	171.4	28.6	8
2 1/2	60	267	57.2	57.2	114	73	86	79	150	58	76.2	74.6	75.4	62.7	8	19	104.8	7	196.8	31.7	8
3	80	305	66.7	66.7	133	88.9	99	92	175	. . .	. . .	90.7	91.4	77.9	10	21	127	7	228.6	34.9	8
4	100	355	76.2	76.2	165	114.3	115	108	197	. . .	. . .	116.1	116.8	102.3	11	24	157.2	7	273	41.3	8
5	125	420	92.1	92.1	203	141.3	137	130	236	. . .	. . .	143.8	144.4	128.2	11	24	185.7	7	323.8	47.6	8
6	150	485	108	108	235	168.3	159	152	280	. . .	. . .	170.7	171.4	154.1	13	27	215.9	7	368.3	54	8
8	200	552	127	127	305	219.1	185	178	325	. . .	. . .	221.5	222.2	202.7	13	32	269.9	7	436.2	54	12
10	250	675	165.1	165.1	375	273	236	229	426	. . .	. . .	276.2	277.4	254.6	13	33	323.8	7	539.8	66.7	12
12	300	762	184.2	184.2	441	323.8	261	254	471	. . .	. . .	327	328.2	304.8	13	40	381	7	619.1	73	12