Blind Flange

Nominal Diameter: DN15–DN600 (NPS 1/2″–NPS 24″)
Pressure Rating: PN20-PN420 (Class150 – Class2500)
Sealing Faces: RF, FF, MFM, TG, RTJ
Standards: ASME B16.5, ASME B16.47, EN1092-1, HG/T20592, HG/T20615, GB/T9119, JIS B2220
Materials: Q235B, 20#, A105, A350 LF2, 304, 316L, 2205, 2507, Alloy20, Hastelloy C, TA2
Working Media: Tap water, sewage, circulating water, air, low-pressure oil, neutral chemical liquid
Temperature Range: -196℃ ~ 1000℃
Application Industries: Oil & Gas, Chemical, Petrochemical, Power, Marine, Food & Beverage, Pharmaceutical, Water Treatment, HVAC, Metallurgy, and Environmental Engineering.

Product details

Blind Flange, also known as Blind Plate Flange and commonly abbreviated as BL Flange, is a solid flange designed to close the end of pipelines, equipment nozzles, and pressure system openings.

Unlike standard pipe flanges, a Blind Flange has no center bore and completely blocks the flow passage. It provides reliable isolation of the pipeline system through bolted connection and gasket sealing.

Blind Flanges are widely used in industrial piping systems for pipeline isolation, maintenance shutdowns, pressure testing, temporary closure, and future pipeline expansion.

Product Specifications

Note: The flange inner diameter (B) is determined by the wall thickness of the steel pipe and shall be specified by the user at the time of ordering.（Unit: mm）

BL-150LB-2500LB

DN	NPS	Type/Class	Part No	D	K	L	Th	n	C	d1	f	P	E	F	d	w	X	y	Z
15	0.5	BL-150LB-SFT	XLXBL150SFT05	90	60.3	16	M14	4	9.6	35.1	1.5
20	0.75	BL-150LB-SFT	XLXBL150SFT075	100	69.9	16	M14	4	11.2	42.9	1.5
25	1	BL-150LB-SFT	XLXBL150SFT1	110	79.4	16	M14	4	12.7	50.8	1.5	47.63	6.35	8.74
32	1.25	BL-150LB-SFT	XLXBL150SFT125	115	88.9	16	M14	4	14.3	63.5	1.5	57.15	6.35	8.74
40	1.5	BL-150LB-SFT	XLXBL150SFT15	125	98.4	16	M14	4	15.9	73	1.5	65.07	6.35	8.74
50	2	BL-150LB-SFT	XLXBL150SFT2	150	120.7	18	M16	4	17.5	91.9	1.5	82.55	6.35	8.74
65	2.5	BL-150LB-SFT	XLXBL150SFT25	180	139.7	18	M16	4	20.7	104.6	1.5	101.6	6.35	8.74
80	3	BL-150LB-SFT	XLXBL150SFT3	190	152.4	18	M16	4	22.3	127	1.5	114.3	6.35	8.74
100	4	BL-150LB-SFT	XLXBL150SFT4	230	190.5	18	M16	8	22.3	157.2	1.5	149.23	6.35	8.74
125	5	BL-150LB-SFT	XLXBL150SFT5	255	215.9	22	M20	8	22.3	185.7	1.5	171.45	6.35	8.74
150	6	BL-150LB-SFT	XLXBL150SFT6	280	241.3	22	M20	8	23.9	215.9	1.5	193.68	6.35	8.74
200	8	BL-150LB-SFT	XLXBL150SFT8	345	298.58	22	M20	8	27.0	269.7	1.5	247.65	6.35	8.74
250	10	BL-150LB-SFT	XLXBL150SFT10	405	362.0	26	M24	12	28.6	323.8	1.5	304.8	6.35	8.74
300	12	BL-150LB-SFT	XLXBL150SFT12	485	431.8	26	M24	12	30.2	381	1.5	381	6.35	8.74
350	14	BL-150LB-SFT	XLXBL150SFT14	535	476.2	30	M27	12	33.4	412.8	1.5	396.88	6.35	8.74
400	16	BL-150LB-SFT	XLXBL150SFT16	595	539.8	30	M27	16	35.0	469.9	1.5	454.03	6.35	8.74
450	18	BL-150LB-SFT	XLXBL150SFT18	635	577.9	33	M30	16	38.1	533.4	1.5	517.53	6.35	8.74
500	20	BL-150LB-SFT	XLXBL150SFT20	700	635.0	33	M30	20	41.3	584.2	1.5	558.8	6.35	8.74
600	24	BL-150LB-SFT	XLXBL150SFT24	815	749.3	36	M33	20	46.1	692.2	1.5	673.1	6.35	8.74
15	0.5	BL-300LB-SFT	XLXBL300SFT05	95	66.7	16	M14	4	12.7	35.1	1.5	34.14	5.54	7.14	46	25.4	34.9	36.5	23.8
20	0.75	BL-300LB-SFT	XLXBL300SFT075	115	82.6	18	M16	4	14.3	42.9	1.5	42.88	6.35	8.74	54	33.3	42.9	44.4	31.8
25	1	BL-300LB-SFT	XLXBL300SFT1	125	88.9	18	M16	4	15.9	50.8	1.5	50.8	6.35	8.74	62	38.1	50.8	52.4	36.5
32	1.25	BL-300LB-SFT	XLXBL300SFT125	135	98.4	18	M16	4	17.5	63.5	1.5	60.33	6.35	8.74	75	47.6	63.5	65.1	46
40	1.5	BL-300LB-SFT	XLXBL300SFT15	155	114.3	22	M20	4	19.1	73	1.5	68.27	6.35	8.74	84	54	73	74.6	52.4
50	2	BL-300LB-SFT	XLXBL300SFT2	165	127.0	18	M16	8	20.7	91.9	1.5	82.55	7.92	11.91	103	73	92.1	93.7	71.4
65	2.5	BL-300LB-SFT	XLXBL300SFT25	190	149.2	22	M20	8	23.9	104.6	1.5	101.6	7.92	11.91	116	85.7	104.8	106.4	84.1
80	3	BL-300LB-SFT	XLXBL300SFT3	210	168.3	22	M20	8	27.0	127	1.5	123.83	7.92	11.91	138	108	127	128.6	106.4
100	4	BL-300LB-SFT	XLXBL300SFT4	255	200.0	22	M20	8	30.2	157.2	1.5	149.23	7.92	11.91	168	131.8	157.2	158.8	130.2
125	5	BL-300LB-SFT	XLXBL300SFT5	280	235.0	22	M20	8	33.4	185.7	1.5	180.98	7.92	11.91	197	160.3	185.7	187.3	158.8
150	6	BL-300LB-SFT	XLXBL300SFT6	320	269.9	22	M20	12	35.0	215.9	1.5	211.12	7.92	11.91	227	190.5	215.9	217.5	188.9
200	8	BL-300LB-SFT	XLXBL300SFT8	380	330.2	26	M24	12	39.7	269.7	1.5	269.88	7.92	11.91	281	238.1	269.9	271.5	236.5
250	10	BL-300LB-SFT	XLXBL300SFT10	445	387.4	30	M27	16	46.1	323.8	1.5	323.85	7.92	11.91	335	285.8	323.8	325.4	284.2
300	12	BL-300LB-SFT	XLXBL300SFT12	520	450.8	33	M30	16	49.3	381	1.5	381	7.92	11.91	392	342.9	381	382.6	341.3
350	14	BL-300LB-SFT	XLXBL300SFT14	585	514.4	33	M30	20	52.4	412.8	1.5	419.1	7.92	11.91	424	374.6	412.8	414.3	373.1
400	16	BL-300LB-SFT	XLXBL300SFT16	650	571.5	36	M33	20	55.6	469.9	1.5	469.9	7.92	11.91	481	425.4	469.9	471.5	423..9
450	18	BL-300LB-SFT	XLXBL300SFT18	710	628.6	36	M33	24	58.8	533.4	1.5	533.4	7.92	11.91	544	489	533.4	535	487.4
500	20	BL-300LB-SFT	XLXBL300SFT20	775	685.8	36	M33	24	62.0	584.2	1.5	584.2	9.53	13.49	595	533.4	584.2	585.8	531.8
600	24	BL-300LB-SFT	XLXBL300SFT24	915	812.8	42	M39×3	24	68.3	692.2	1.5	692.15	11.13	16.66	703	641.4	692.2	693.7	639.8
15	0.5	BL-600LB-SFT	XLXBL600SFT05	95	66.7	16	M14	4	14.3	35.1	6.4	34.14	5.54	7.14	46	25.4	34.9	36.5	23.8
20	0.75	BL-600LB-SFT	XLXBL600SFT075	115	82.6	18	M16	4	15.9	42.9	6.4	42.88	6.35	8.74	54	33.3	42.9	44.4	31.8
25	1	BL-600LB-SFT	XLXBL600SFT1	125	88.9	18	M16	4	17.5	50.8	6.4	50.8	6.35	8.74	62	38.1	50.8	52.4	36.5
32	1.25	BL-600LB-SFT	XLXBL600SFT125	135	98.4	18	M16	4	20.7	63.5	6.4	60.33	6.35	8.74	75	47.6	63.5	65.1	46
40	1.5	BL-600LB-SFT	XLXBL600SFT15	155	114.3	22	M20	4	22.3	73	6.4	68.27	6.35	8.74	84	54	73	74.6	52.4
50	2	BL-600LB-SFT	XLXBL600SFT2	165	127.0	18	M16	8	25.4	91.9	6.4	82.55	7.92	11.91	103	73	92.1	93.7	71.4
65	2.5	BL-600LB-SFT	XLXBL600SFT25	190	169.2	22	M20	8	28.6	104.6	6.4	101.6	7.92	11.91	116	85.7	104.8	106.4	84.1
80	3	BL-600LB-SFT	XLXBL600SFT3	210	168.3	22	M20	8	31.8	127	6.4	123.83	7.92	11.91	138	108	127	128.6	106.4
100	4	BL-600LB-SFT	XLXBL600SFT4	275	215.9	26	M24	8	38.1	157.2	6.4	149.23	7.92	11.91	168	131.8	157.2	158.8	130.2
125	5	BL-600LB-SFT	XLXBL600SFT5	330	267	30	M27	8	45	185.7	6.4	180.98	7.92	11.91	197	160.3	185.7	187.3	158.8
150	6	BL-600LB-SFT	XLXBL600SFT6	355	292	30	M27	12	48	215.9	6.4	211.12	7.92	11.91	227	190.5	215.9	217.5	188.9
200	8	BL-600LB-SFT	XLXBL600SFT8	420	349	33	M30	12	56	269.7	6.4	269.88	7.92	11.91	281	238.1	269.9	271.5	236.5
250	10	BL-600LB-SFT	XLXBL600SFT10	510	431	36	M33	16	64	323.8	6.4	323.85	7.92	11.91	335	285.8	323.8	325.4	284.2
300	12	BL-600LB-SFT	XLXBL600SFT12	560	489	36	M33	20	67	381	6.4	381	7.92	11.91	392	342.9	381	382.6	341.3
350	14	BL-600LB-SFT	XLXBL600SFT14	605	527	39	M36X3	20	70	412.8	6.4	419.1	7.92	11.91	424	374.6	412.8	414.3	373.1
400	16	BL-600LB-SFT	XLXBL600SFT16	685	603	42	M39X3	20	76	469.9	6.4	469.9	7.92	11.91	481	425.4	469.9	471.5	423..9
450	18	BL-600LB-SFT	XLXBL600SFT18	745	654	45	M42X3	20	83	533.4	6.4	533.4	7.92	11.91	544	489	533.4	535	487.4
500	20	BL-600LB-SFT	XLXBL600SFT20	815	724	45	M42X3	24	89	584.2	6.4	584.2	9.53	13.49	595	533.4	584.2	585.8	531.8
600	24	BL-600LB-SFT	XLXBL600SFT24	940	838	51	M48X3	24	102	692.2	6.4	692.15	11.13	16.66	703	641.4	692.2	693.7	639.8
15	0.5	BL-900LB-SFT	XLXBL900SFT05	120	82.6	22	M20	4	22.3	35.1	6.4	39.67	6.35	8.74	46	25.4	34.9	36.5	23.8
20	0.75	BL-900LB-SFT	XLXBL900SFT075	130	88.9	22	M20	4	25.4	42.9	6.4	44.45	6.35	8.74	54	33.3	42.9	44.4	31.8
25	1	BL-900LB-SFT	XLXBL900SFT1	150	101.6	26	M24	4	28.6	50.8	6.4	50.8	6.35	8.74	62	38.1	50.8	52.4	36.5
32	1.25	BL-900LB-SFT	XLXBL900SFT125	160	111.1	26	M24	4	28.6	63.5	6.4	60.33	6.35	8.74	75	47.6	63.5	65.1	46
40	1.5	BL-900LB-SFT	XLXBL900SFT15	180	123.8	30	M27	4	31.8	73	6.4	68.27	6.35	8.74	84	54	73	74.6	52.4
50	2	BL-900LB-SFT	XLXBL900SFT2	215	165.1	26	M24	8	38.1	91.9	6.4	95.25	7.92	11.91	103	73	92.1	93.7	71.4
65	2.5	BL-900LB-SFT	XLXBL900SFT25	245	190.5	30	M27	8	41.3	104.6	6.4	107.95	7.92	11.91	116	85.7	104.8	106.4	84.1
80	3	BL-900LB-SFT	XLXBL900SFT3	240	190.5	26	M24	8	38.1	127	6.4	123.83	7.92	11.91	138	108	127	128.6	106.4
100	4	BL-900LB-SFT	XLXBL900SFT4	290	235	33	M30	8	44.5	157.2	6.4	149.23	7.92	11.91	168	131.8	157.2	158.8	130.2
125	5	BL-900LB-SFT	XLXBL900SFT5	350	279.4	36	M33	8	50.8	185.7	6.4	180.98	7.92	11.91	197	160.3	185.7	187.3	158.8
150	6	BL-900LB-SFT	XLXBL900SFT6	380	317.5	33	M30	12	55.6	215.9	6.4	211.12	7.92	11.91	227	190.5	215.9	217.5	188.9
200	8	BL-900LB-SFT	XLXBL900SFT8	470	393.7	39	M36x3	12	63.5	269.7	6.4	269.88	7.92	11.91	281	238.1	269.9	271.5	236.5
250	10	BL-900LB-SFT	XLXBL900SFT10	545	469.9	39	M36x3	16	69.9	323.8	6.4	323.85	7.92	11.91	335	285.8	323.8	325.4	284.2
300	12	BL-900LB-SFT	XLXBL900SFT12	610	533.4	39	M36x3	20	79.4	381	6.4	381	7.92	11.91	392	342.9	381	382.6	341.3
350	14	BL-900LB-SFT	XLXBL900SFT14	640	558.8	42	M39x3	20	85.8	412.8	6.4	419.1	11.13	16.66	424	374.6	412.8	414.3	373.1
400	16	BL-900LB-SFT	XLXBL900SFT16	705	616	45	M42x3	20	88.9	469.9	6.4	469.9	11.13	16.66	481	425.4	469.9	471.5	423..9
450	18	BL-900LB-SFT	XLXBL900SFT18	785	685.8	51	M48x3	20	101.6	533.4	6.4	533.4	12.7	19.84	544	489	533.4	535	487.4
500	20	BL-900LB-SFT	XLXBL900SFT20	855	749.3	55	M52x3	20	108.0	584.2	6.4	584.2	12.7	19.84	595	533.4	584.2	585.8	531.8
600	24	BL-900LB-SFT	XLXBL900SFT24	1040	901.7	68	M64x3	20	139.7	692.2	6.4	692.15	15.88	26.97	703	641.4	692.2	693.7	639.8
15	0.5	BL-1500LB-SFT	XLXBL1500SFT05	120	82.6	22	M20	4	22.3	35.1	6.4	39.67	6.35	8.74	46	25.4	34.9	36.5	23.8
20	0.75	BL-1500LB-SFT	XLXBL1500SFT075	130	88.9	22	M20	4	25.4	42.9	6.4	44.45	6.35	8.74	54	33.3	42.9	44.4	31.8
25	1	BL-1500LB-SFT	XLXBL1500SFT1	150	101.6	26	M24	4	28.6	50.8	6.4	50.8	6.35	8.74	62	38.1	50.8	52.4	36.5
32	1.25	BL-1500LB-SFT	XLXBL1500SFT125	160	111.1	26	M24	4	28.6	63.5	6.4	60.33	6.35	8.74	75	47.6	63.5	65.1	46
40	1.5	BL-1500LB-SFT	XLXBL1500SFT15	180	123.8	30	M27	4	31.8	73	6.4	68.27	6.35	8.74	84	54	73	74.6	52.4
50	2	BL-1500LB-SFT	XLXBL1500SFT2	215	165.1	26	M24	8	38.1	91.9	6.4	95.25	7.92	11.91	103	73	92.1	93.7	71.4
65	2.5	BL-1500LB-SFT	XLXBL1500SFT25	245	190.5	30	M27	8	41.3	104.6	6.4	107.95	7.92	11.91	116	85.7	104.8	106.4	84.1
80	3	BL-1500LB-SFT	XLXBL1500SFT3	265	203.2	33	M30	8	47.7	127	6.4	136.53	7.92	11.91	138	108	127	128.6	106.4
100	4	BL-1500LB-SFT	XLXBL1500SFT4	310	241.3	36	M33	8	54.0	157.2	6.4	161.93	7.92	11.91	168	131.8	157.2	158.8	130.2
125	5	BL-1500LB-SFT	XLXBL1500SFT5	372	292.1	42	M39x3	8	73.1	185.7	6.4	193.68	7.92	11.91	197	160.3	185.7	187.3	158.8
150	6	BL-1500LB-SFT	XLXBL1500SFT6	395	317.5	39	M36x3	12	82.6	215.9	6.4	211.14	9.53	13.49	227	190.5	215.9	217.5	188.9
200	8	BL-1500LB-SFT	XLXBL1500SFT8	485	393.7	45	M42x3	12	92.1	269.7	6.4	269.88	11.13	16.66	281	238.1	269.9	271.5	236.5
250	10	BL-1500LB-SFT	XLXBL1500SFT10	585	482.6	51	M48x3	12	108.0	323.8	6.4	323.85	11.13	16.66	335	285.8	323.8	325.4	284.2
300	12	BL-1500LB-SFT	XLXBL1500SFT12	675	571.5	55	M52x3	16	123.9	381	6.4	381	14.27	23.01	392	342.9	381	382.6	341.3
350	14	BL-1500LB-SFT	XLXBL1500SFT14	750	635.0	60	M56x3	16	133.4	412.8	6.4	419.1	15.88	26.97	424	374.6	412.8	414.3	373.1
400	16	BL-1500LB-SFT	XLXBL1500SFT16	825	704.8	68	M64x3	16	146.1	469.9	6.4	469.9	17.48	30.18	481	425.4	469.9	471.5	423..9
450	18	BL-1500LB-SFT	XLXBL1500SFT18	915	774.7	74	M70x3	16	162.0	533.4	6.4	533.4	17.48	30.18	544	489	533.4	535	487.4
500	20	BL-1500LB-SFT	XLXBL1500SFT20	985	831.8	80	M76x3	16	177.8	584.2	6.4	584.2	17.48	33.32	595	533.4	584.2	585.8	531.8
600	24	BL-1500LB-SFT	XLXBL1500SFT24	1170	990.6	94	M90x3	16	203.2	692.2	6.4	692.15	20.62	36.53	703	641.4	692.2	693.7	639.8
15	0.5	BL-2500LB-SFT	XLXBL2500SFT05	135	88.9	22	M20	4	30.2	35.1	6.4	42.88	6.35	8.74	46	25.4	34.9	36.5	23.8
20	0.75	BL-2500LB-SFT	XLXBL2500SFT075	140	95.2	22	M20	4	31.8	42.9	6.4	50.8	6.35	8.74	54	33.3	42.9	44.4	31.8
25	1	BL-2500LB-SFT	XLXBL2500SFT1	160	108.0	26	M24	4	35.0	50.8	6.4	60.33	6.35	8.74	62	38.1	50.8	52.4	36.5
32	1.25	BL-2500LB-SFT	XLXBL2500SFT125	185	130.2	30	M27	4	38.1	63.5	6.4	72.23	7.92	11.91	75	47.6	63.5	65.1	46
40	1.5	BL-2500LB-SFT	XLXBL2500SFT15	205	146.0	33	M30	4	44.5	73	6.4	82.55	7.92	11.91	84	54	73	74.6	52.4
50	2	BL-2500LB-SFT	XLXBL2500SFT2	235	171.4	30	M27	8	50.9	91.9	6.4	101.6	7.92	11.91	103	73	92.1	93.7	71.4
65	2.5	BL-2500LB-SFT	XLXBL2500SFT25	265	196.8	33	M30	8	57.2	104.6	6.4	111.13	9.52	13.49	116	85.7	104.8	106.4	84.1
80	3	BL-2500LB-SFT	XLXBL2500SFT3	305	228.6	36	M33	8	66.7	127	6.4	127	9.53	13.49	138	108	127	128.6	106.4
100	4	BL-2500LB-SFT	XLXBL2500SFT4	355	273.0	42	M39x3	8	76.2	157.2	6.4	157.18	11.13	16.66	168	131.8	157.2	158.8	130.2
125	5	BL-2500LB-SFT	XLXBL2500SFT5	420	323.8	48	M45x3	8	92.1	185.7	6.4	190.5	12.7	19.84	197	160.3	185.7	187.3	158.8
150	6	BL-2500LB-SFT	XLXBL2500SFT6	485	358.3	55	M52x3	8	108.0	215.9	6.4	228.6	12.7	19.84	227	190.5	215.9	217.5	188.9
200	8	BL-2500LB-SFT	XLXBL2500SFT8	550	438.2	55	M52x3	12	127.0	269.7	6.4	279.4	14.27	23.01	281	238.1	269.9	271.5	236.5
250	10	BL-2500LB-SFT	XLXBL2500SFT10	675	539.8	68	M64x3	12	165.1	323.8	6.4	342.9	17.48	30.18	335	285.8	323.8	325.4	284.2
300	12	BL-2500LB-SFT	XLXBL2500SFT12	760	619.1	74	M70x3	12	184.2	381	6.4	406.4	17.48	33.32	392	342.9	381	382.6	341.3

It is integrally made of solid forgings or steel plates without central flow holes. Bolt holes machined on the surface are completely consistent with the matching flange, and the type of sealing face matches the corresponding flange.

During installation, it is sandwiched between two flanges. The bolts compress the gasket to achieve complete tightness and block the flow of medium in the pipeline. To resume fluid circulation, remove the blind flange and replace it with a pipe flange.

The solid monolithic structure delivers stable pressure bearing and uniform stress distribution. It resists deformation under high-pressure service conditions and can withstand the full rated pressure of the pipeline.

Blind Flange

Product details

Product Specifications

BL-150LB-2500LB

Email

Whatsapp

Address