Schedule of Weldneck Flanges & Weights

Weldneck flanges

Weldneck flanges have drilled wall thickness which is of equally same dimension existing for matching pipe. Bore will be larger if the pipe is lighter and opposite will be true if pipe is heavier and the bore will be small.

Erosion as well as turbulence is significantly reduced in pipeline as bores of flange & pipe match. Due to these reasons weldneck flanges are chosen for critical applications where high pressure and hot-cold temperatures are prevalent.

Welding neck flanges

Slip on flanges

Blind flanges

Threaded flanges

Lap joint flanges

Socket weld flanges

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WELDING NECK FLANGES BORES (in inchines)
Nom Pipe Size	Outside Diam	Sched 10	Sched 20	Sched 30	Std. Wall	Sched 40	Sched 60	Extra Strong	Sched 80	Sched 100	Sched 120	Sched 140	Sched 160	Double Extra Strong
1/2''	0.840	0.674	-	-	0.622	0.622	-	0.546	0.546	-	-	-	0.464	0.252
3/4''	1.050	0.884	-	-	0.824	0.824	-	0.742	0.742	-	-	-	0.612	0.434
1''	1.315	1.097	-	-	1.049	1.049	-	0.957	0.957	-	-	-	0.815	0.599
1.1/4''	1.660	1.442	-	-	1.380	1.380	-	1.278	1.278	-	-	-	1.160	0.896
1.1/2''	1.900	1.682	-	-	1.610	1.610	-	1.500	1.500	-	-	-	1.338	1.100
2''	2.375	2.157	-	-	2.067	2.067	-	1.939	1.939	-	-	-	1.687	1.503
2.1/2''	2.875	2.635	-	-	2.469	2.469	-	2.323	2.323	-	-	-	2.125	1.771
3''	3.500	3.260	-	-	3.068	3.068	-	2.900	2.900	-	-	-	2.624	2.300
3-1/2''	4.000	3.760	-	-	3.548	3.548	-	3.364	3.364	-	-	-	-	2.728
4''	4.500	4.260	-	-	4.026	4.026	-	3.826	3.826	-	3.624	-	3.438	3.152
5''	5.563	5.295	-	-	5.047	5.047	-	4.813	4.813	-	4.563	-	4.313	4.063
6''	6.625	6.357	-	-	6.065	6.065	-	5.761	5.761	-	5.501	-	5.187	4.897
8''	8.625	8.329	8.125	8.071	7.981	7.981	7.813	7.625	7.625	7.437	7.187	7.001	6.813	6.875
10''	10.750	10.420	10.250	10.136	10.020	10.020	9.750	9.750	9.562	9.312	9.062	8.750	8.500	8.750
12''	12.750	12.390	12.250	12.090	12.000	11.938	11.626	11.750	11.374	11.062	10.750	10.500	10.126	10.750
14''	14.000	13.500	13.376	13.250	13.250	13.124	12.812	13.000	12.500	12.124	11.814	11.500	11.188	-
16''	16.000	15.500	15.376	15.250	15.250	15.000	14.688	15.000	14.312	13.938	13.564	13.124	12.812	-
18''	18.000	17.500	17.376	17.124	17.250	16.876	16.500	17.000	16.124	15.688	15.250	14.876	14.438	-
20''	20.000	19.500	19.250	19.000	19.250	18.812	18.376	19.000	17.938	17.438	17.000	16.500	16.062	-
24''	24.000	23.500	23.250	22.876	23.250	22.624	22.062	23.000	21.562	20.938	20.376	19.876	19.312	-
30''	30.000	29.376	29.000	28.750	29.250	-	-	29.000	-	-	-	-	-	-
36''	36.000	35.376	35.000	34.750	35.250	34.500	-	35.000	-	-	-	-	-	-
42''	42.000	-	-	-	41.250	-	-	41.000	-	-	-	-	-	-

ANSI FLANGES WEIGHT (KGS)
Nom Pipe Size	150#			300#			600#			900#			1500#			2500#
	WN	S/O	B/K	WN	S/O	B/K	WN	S/O	B/K	WN	S/O	B/K	WN	S/O	B/K	WN	S/O	B/K
1/2''	0.7	0.4	0.5	0.8	0.7	0.8	0.9	0.8	0.8	2.1	1.8	1.9	2.1	1.8	1.9	3.2	3	3
3/4''	0.8	0.7	0.8	1.4	1.2	1.2	1.6	1.4	1.4	2.7	2.4	2.7	2.7	2.4	2.7	3.6	4	4.5
1''	1.1	0.8	0.9	1.7	1.4	1.5	1.9	1.7	1.7	3.9	3.6	3.7	3.9	3.6	3.7	5.4	5	5
1.1/4''	1.5	1.2	1.3	2.2	1.8	2	2.6	2.1	2.4	4.5	4.1	4.3	4.5	4.1	4.3	7.8	8	8
1.1/2''	1.8	1.4	1.6	3.2	2.7	2.9	3.6	3.1	3.4	6.2	5.4	5.9	6.2	5.4	5.9	11.5	11	11
2''	2.7	2.2	2.6	3.6	3.2	3.5	4.7	3.9	4.4	11.3	10.5	11.3	11.3	10.5	11.3	19	17	17
2.1/2''	4.4	3.5	4.1	5.4	4.5	5.3	4.8	5.4	6.8	16.3	15.8	16	16.3	15.8	16	24	25	25
3''	5.2	3.8	5.1	7.3	5.9	7.2	8.7	7.3	8.9	15	12.3	16.8	21	21.5	19.5	42.6	38	39
3-1/2''	6.4	5	6.5	8.9	7.5	9.2	11.6	9	12.7	-	-	-	-	-	-	-	-	-
4''	7.5	5.6	7.5	11.8	10	12.2	18.4	16.5	18.6	24	23.2	24.5	31.8	31	33	64	58	60
5''	9.2	6.5	9.2	16	12.5	16	31	28.5	30.8	38.5	37.5	39.5	59	58.8	60	111	95	101
6''	11.0	8.1	11.8	20.2	16.5	22	37	36.2	38	50	48.3	51.5	72	74	75	171	146	156
8''	18.4	13	20.4	31.2	25.5	36	54.5	51.5	62.2	85	75	89	124	112	125	261	220	242
10''	25.5	18.4	31	44.3	35	55	98.5	76.2	102	123	110	131	207	184	215	485	420	465
12''	37	28.5	47	63.5	52	82.5	105	89.5	132	168	146	187	306	264	316	698	590	665
14''	51	37.5	60	86	73	108	150	102	158	198	172	224	416	-	-	-	-	-
16''	61.5	44.5	61	112	88	139	177	150	225	225	192	259	567	-	-	-	-	-
18''	71.5	54	93	141	115	178	228	180	285	318	272	383	736	-	-	-	-	-
20''	85	72	127	173	139	228	285	231	365	376	330	482	929	-	-	-	-	-
24''	119	95	190	248	212	350	372	330	532	680	632	905	1504	-	-	-	-	-

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