IX Seal Rings

IX Seal Rings are designed according to NORSOK L-005 standard for assembling with compact flange connections.

IX seal rings specific informations

Typical IX seal rings materials

Typical minimum yield stress and ultimate stress for the IX seal ring material shall at maximum design temperature be 300 MPa and 360 MPa, respectively, in order to allow for reasonably elastic spring-back.

Lower strength may be used, but is not recommended. The user is responsible for selecting a seal ring material which is suitable for the service medium and the design temperature conditions. IX ring gasket materials are commonly chosen to be compatible with the flange material, i.e. duplex ix seal ring in duplex compact flange.

List of typical IX seal ring specifications

Material group	Material group in NORSOK M-630	EN steel no.	Material specification
			Forgings	Seamless pipe	Welded pipe
CS 360LT	Carbon steel Type 360LT impact tested	1.0570 1.0571	ASTM A694 Grade F52	API 5L X52	EN 10025 S355J2G3
SS 22Cr	Stainless steel Type 22Cr Duplex	1.4462	ASTM A182 Grade F51 Grade F60	ASTM A790 UNS S31803 UNS S32205	A928 UNS S31803 UNS S32205
17-4 PH	Martensitic stainless steel	/	ASTM A705 Grade 630 1150HM	/	/
A-286	Nickel base alloys	1.498	ASTM A638 Grade 660	/	/
Alloy 625, Incoloy 825	Nickel base alloys	2.4856	ASTM B564 N06625, 825	/	/

NOTE 1: For testing purposes at ambient temperature, a carbon steel ring can be used for all flange materials.
NOTE 2: Listed seal ring materials may be less resistant to corrosion than the stainless steel of the flanges, and this is justified by the low probability of corrosion due to the stressed contact between heel areas of the mating flanges, and due to the seal at the outer circumference of the flanges preventing ingress of moisture and water.
Coating
IX seal rings shall be coated with 10 µm to 30 μm PTFE coating. The colour of the coating shall follow the requirements of NORSOK standard L-005.
 Surface finish for seal rings

Location	Ra max. μm
Sealing faces	0.8
All other surfaces	6.3

Dimensions of IX seal ring grooves

DN	NPS	IX size	DA1 mm	DA3 mm	E1 mm	αA2 °
15	½	IX15	20.8	30.83	5.30	15.0
20	¾	IX20	25.8	35.82	5.30	15.0
25	1	IX25	32.8	42.82	5.30	15.0
40	1½	IX40	47.8	58.81	5.58	15.0
50	2	IX50	59.8	71.80	6.19	15.0
65	2½	IX65	72.8	85.79	6.79	15.0
80	3	IX80	87.8	101.77	7.42	15.0
100	4	IX100	113.8	129.75	8.40	15.0
125	5	IX125	139.8	157.68	9.27	15.0
150	6	IX150	167.7	187.66	10.12	15.0
200	8	IX200	217.7	239.62	11.48	15.0
250	10	IX250	271.7	299.58	12.90	15.0
300	12	IX300	321.7	348.54	13.97	15.0
350	14	IX350	353.7	381.51	14.63	15.0
400	16	IX400	405.7	435.47	15.63	15.0
450	18	IX450	455.7	487.43	16.54	15.0
500	20	IX500	507.7	540.39	17.63	15.0
550	22	IX550	557.7	592.35	18.45	15.0
600	24	IX600	607.7	643.32	19.23	15.0
650	26	IX650	659.5	696.23	20.00	15.0
700	28	IX700	709.5	748.19	20.92	15.0
750	30	IX750	761.5	801.15	21.65	15.0
800	32	IX800	811.5	852.11	22.32	15.0
850	34	IX850	861.5	903.07	22.97	15.0
900	36	IX900	913.5	957.03	23.82	15.0
950	38	IX950	963.5	1007.99	24.44	15.0
1000	40	IX1000	1015.5	1060.95	25.06	15.0
1050	42	IX1050	1065.5	1111.91	25.65	15.0
1100	44	IX1100	1115.5	1162.87	26.42	15.0
1150	46	IX1150	1167.5	1215.83	27.00	15.0
1200	48	IX1200	1217.5	1266.79	27.54	15.0

IX seal rings size chart

IX seal rings dimensions and their weights

DN	NPS	IX size	DG1 mm	DG2 mm	DG3 mm	DG4 mm	DG5 mm	DG6 mm	DG7 mm	DG8 mm	HG1 mm	HG2 mm	HG3 mm	HG4 mm	HG5 mm	RG1 mm	Weight kg
15	½	IX15	22.2	27.91	28.46	28.66	27.47	29.14	30.19	24.7	0.35	1.20	3.30	3.8	10.00	0.5	0.02
20	¾	IX20	27.2	32.93	33.47	33.67	32.48	34.16	35.20	29.7	0.35	1.20	3.30	3.8	10.00	0.5	0.03
25	1	IX25	34.2	39.95	40.49	40.69	39.50	41.18	42.22	36.7	0.35	1.20	3.30	3.8	10.00	0.5	0.03
40	1½	IX40	49.3	55.84	56.38	56.58	55.34	57.11	58.21	51.9	0.35	1.27	3.48	4.0	10.56	0.5	0.05
50	2	IX50	61.3	68.43	69.08	69.32	67.92	69.89	71.13	64.4	0.42	1.41	3.89	4.5	11.78	0.6	0.08
65	2½	IX65	74.4	82.14	82.79	83.03	81.52	83.69	85.05	77.8	0.42	1.56	4.28	4.9	12.98	0.6	0.12
80	3	IX80	89.5	97.74	98.49	98.77	97.09	99.47	100.96	93.3	0.49	1.71	4.70	5.4	14.24	0.7	0.17
100	4	IX100	115.7	125.17	126.04	126.36	124.44	127.15	128.85	120.1	0.56	1.94	5.34	6.2	16.19	0.8	0.28
125	5	IX125	142.0	152.66	153.64	154.00	151.87	154.87	156.75	146.7	0.63	2.15	5.92	6.8	17.94	0.9	0.42
150	6	IX150	170.2	182.17	183.25	183.66	181.32	184.61	186.66	175.4	0.70	2.36	6.48	7.5	19.64	1.0	0.62
200	8	IX200	220.5	233.46	234.66	235.10	232.45	236.19	238.54	226.5	0.77	2.68	7.38	8.5	22.36	1.1	0.99
250	10	IX250	274.9	292.64	294.05	294.57	291.57	295.78	298.42	281.7	0.91	3.02	8.31	9.6	25.20	1.3	1.85
300	12	IX300	325.0	341.13	342.65	343.21	339.97	344.52	347.36	332.5	0.98	3.26	8.96	10.4	27.15	1.4	2.18
350	14	IX350	357.1	373.87	375.38	375.94	372.58	377.34	380.32	365.0	0.98	3.42	9.39	11.0	28.46	1.4	2.60
400	16	IX400	409.3	427.36	428.98	429.58	425.98	431.08	434.27	417.9	1.05	3.66	10.05	11.9	30.47	1.5	3.43
450	18	IX450	459.4	478.90	480.63	481.27	477.45	482.85	486.23	468.6	1.12	3.87	10.65	12.7	32.28	1.6	4.38
500	20	IX500	511.6	531.45	533.29	533.97	529.93	535.63	539.20	521.4	1.19	4.09	11.24	13.5	34.06	1.7	5.27
550	22	IX550	561.7	583.04	584.99	585.71	581.62	587.44	591.18	572.1	1.26	4.28	11.78	14.3	35.69	1.8	6.48
600	24	IX600	611.9	633.64	635.70	636.46	632.40	638.26	642.16	622.8	1.33	4.47	12.29	15.0	37.25	1.9	7.55
650	26	IX650	664.0	686.37	688.42	689.18	685.19	691.09	695.16	675.5	1.33	4.66	12.81	15.7	38.81	1.9	8.74
700	28	IX700	714.1	738.01	740.17	740.97	737.01	742.94	747.16	726.1	1.40	4.83	13.28	16.3	40.25	2.0	10.4
750	30	IX750	766.3	790.65	792.92	793.77	789.83	795.79	800.16	778.8	1.47	5.00	13.76	17.0	41.69	2.1	11.8
800	32	IX800	816.4	841.32	843.70	844.58	840.67	846.66	851.16	829.4	1.54	5.16	14.20	17.6	43.03	2.2	13.3
850	34	IX850	866.6	892.10	894.48	895.36	891.52	897.53	902.18	879.9	1.54	5.32	14.63	18.2	44.34	2.2	14.8
900	36	IX900	918.7	945.78	948.27	949.19	945.38	951.41	956.19	932.6	1.61	5.48	15.06	18.8	45.65	2.3	17.1
950	38	IX950	968.8	996.59	999.08	1000.00	996.26	1002.30	1 007.21	983.1	1.61	5.63	15.47	19.3	46.88	2.3	18.9
1000	40	IX1000	1021.0	1049.28	1051.88	1052.85	1049.13	1055.19	1 060.23	1035.7	1.68	5.77	15.88	19.9	48.12	2.4	20.9
1050	42	IX1050	1071.1	1100.00	1102.70	1103.71	1100.02	1106.10	1 111.26	1086.2	1.75	5.92	16.27	20.4	49.29	2.5	23.0
1100	44	IX1100	1121.3	1150.83	1153.53	1154.54	1150.92	1157.00	1 162.28	1136.8	1.75	6.05	16.64	21.0	50.43	2.5	25.1
1150	46	IX1150	1173.4	1203.55	1206.36	1207.40	1203.82	1209.91	1 215.31	1189.3	1.82	6.19	17.03	21.5	51.59	2.6	27.5
1200	48	IX1200	1223.6	1254.39	1257.20	1258.25	1254.73	1260.83	1 266.35	1239.8	1.82	6.32	17.39	22.0	52.68	2.6	29.9

Note: calculated weights of ix seal rings based on nominal dimensions and density equal to 7,85 kg/dm3.

IX seal ring dimensional tolerances

Dimension	Size range	Tolerance mm
ID (DG1)	≤ IX80 > IX80 ≤ IX350 > IX350	±0.2 ±0.3 ±0.4
Diameter bottom recess (DG5)	≤ IX80 > IX80 ≤ IX350 > IX350	±0.1 ±0.2 ±0.4
Diameter, DG6	≤ IX150 > IX150	-0/+0.1 -0/+0.2
OD of ring (DG7)	≤ IX150 > IX150	-0/+0.1 -0/+0.2
Height, HG2	≤ IX40 > IX40 ≤ IX200 > IX200 ≤ IX400 > IX400 ≤ IX600 > IX600 ≤ IX800 > IX800 ≤ IX1000 > IX1000	±0.05 ±0.1 ±0.2 ±0.3 ±0.4 ±0.5 ±0.6
Height to end angle (HG3)	≤ IX40 > IX40 ≤ IX200 > IX200 ≤ IX400 > IX400 ≤ IX600 > IX600 ≤ IX800 > IX800 ≤ IX1000 > IX1000	±0.05 ±0.1 ±0.2 ±0.3 ±0.4 ±0.5 ±0.6
Height of ring (HG5)	≤ IX150 > IX150 ≤ IX350 > IX350 ≤ IX550 > IX550 ≤ IX700 > IX700 ≤ IX900 > IX900 ≤ IX1100 > IX1100	-0.1/+0 -0.2/+0 -0.3/+0 -0.4/+0 -0.5/+0 -0.6/+0 -0.7/+0

You can find IX seal rings with different kinds of materials and dimensions from JayuSeal ring joint gasket manufacturer.