Spectacle Blind Flange

Teshi Fittings, a premier manufacturer of pipe fittings, offers high-quality Spectacle Blind Flanges designed for various industries including Petroleum, Chemical, Hydraulic, Food, and more. Crafted with meticulous precision and adherence to international quality standards, our Spectacle Blind Flanges provide effective and reliable solutions for isolating sections of piping systems. With a commitment to excellence and customer satisfaction, Teshi Fittings delivers superior performance and durability in every flange, offering tailored solutions to meet specific project requirements. Experience the difference with Teshi Fittings’ Spectacle Blind Flanges and trust in our expertise for all your piping needs.

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Specification
Material & Grades
Dimensions

Standard Specification of Spectacle Blind Flange

Standards / Dimensions	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, BS, GOST, MSS SP-44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605
Size	1/2″ (15 NB) to 48″ (1200NB)
Flange Face Types / Connection Type	Flat Face Flange (FF), Raised Face Flange (RF), Ring Joint Flange (RTJ), Lap Joint Flange, Male and Female Flange (M&F), Large and Small Tongue-and-Groove Flange (T&G)
Dimensions	ANSI B16.5, ANSI B16.47 Series A & B, ASA, API-605, MSS SP44, AWWA, Custom Drawings
BS	BS4504 , BS4504, BS1560, BS10
Class / Pressure Rating	150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.

Material & Grades of Spectacle Blind Flange

Stainless Steel	ASTM/ASME A/SA182:- F304, F304L, F316, F316L, ASTM/ASME A/SA351:- CF3, CF3M, CF8, CF8M, DIN 1.4306, DIN 1.4301, DIN 1.4404, DIN 1.4401, DIN 1.4408, DIN 1.4308, DIN 1.4306, DIN 1.4409
Duplex & Super Duplex Steel	S31803 / S32205 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 S32750 / S32760 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Carbon Steel	ASTM/ASME A/SA105 A/SA105N and A/SA216-WCB, DIN 1.0460, DIN 1.0402, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, CS High Yield ASTM A694 / A694 (F52, F56, F60, F65, F70, F80)
Low Temperature Carbon Steel	ASTM A350, LF2, LF3
Alloy Steel	ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Nickel Alloy	Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020), Titanium (Grade I & II)

Dimension of Spectacle Blind Flange

SPECTACLE BLIND FLANGE CLASS 150 DIMENSIONS

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	51	16	65	6.4	38
3/4	64	21	80	6.4	38
1	70	27	90	6.4	38
1¼	79	42	100	6.4	38
1½	92	48	115	6.4	38
2	108	61	125	9.7	51
2½	127	73	150	9.7	51
3	146	89	170	9.7	64
3½	162	102	185	12.7	64
4	178	114	200	12.7	64
5	213	141	235	15.7	76
6	248	168	270	15.7	76
8	305	219	330	22.4	76
10	359	273	385	25.4	102
12	419	324	450	28.4	102
14	483	356	515	31.8	108
16	536	406	570	38.1	108
18	594	457	630	41.1	114
20	651	508	685	44.5	121
24	772	610	810	50.8	140

SPECTACLE BLIND FLANGE CLASS 300 DIMENSIONS

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	51	16	65	6.4	38
3/4	64	21	80	6.4	38
1	70	27	90	6.4	38
1¼	79	42	100	6.4	38
1½	92	48	115	6.4	38
2	108	61	125	9.7	51
2½	127	73	150	9.7	51
3	146	89	170	9.7	64
3½	162	102	185	12.7	64
4	178	114	200	12.7	64
5	213	141	235	15.7	76
6	248	168	270	15.7	76
8	305	219	330	22.4	76
10	359	273	385	25.4	102
12	419	324	450	28.4	102
14	483	356	515	31.8	108
16	536	406	570	38.1	108
18	594	457	630	41.1	114
20	651	508	685	44.5	121
24	772	610	810	50.8	140

SPECTACLE BLIND FLANGE CLASS 600 DIMENSIONS

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	51	16	65	6.4	38
3/4	64	21	80	6.4	38
1	70	27	90	6.4	57
1¼	79	37	100	9.7	57
1½	92	43	115	9.7	67
2	108	55	125	9.7	57
2½	127	67	150	12.7	67
3	146	83	170	12.7	67
3½	159	96	185	15.7	76
4	191	108	215	15.7	76
5	238	135	265	19.1	86
6	264	162	290	22.4	86
8	318	212	350	28.4	95
10	397	265	430	35.1	105
12	454	315	490	41.1	105
14	489	346	525	44.5	114
16	562	397	605	50.8	124
18	610	448	655	53.8	133
20	679	497	725	63.5	133
24	787	597	840	73.2	152

SPECTACLE BLIND FLANGE CLASS 900 DIMENSIONS

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	60	16	80	6.4	38
3/4	67	21	90	6.4	41
1	76	27	100	6.4	57
1¼	86	37	110	9.7	57
1½	95	43	125	9.7	67
2	140	55	165	12.7	57
2½	162	67	190	12.7	67
3	165	83	190	15.7	67
4	203	108	235	19.1	76
5	244	135	280	22.4	86
6	286	162	320	25.4	86
8	356	212	395	35.1	95
10	432	265	470	41.1	105
12	495	315	535	47.8	105
14	518	346	560	53.8	114
16	572	397	615	60.5	124
18	635	448	685	66.5	133
20	696	497	750	73.2	133
24	835	597	900	88.9	152

SPECTACLE BLIND FLANGE CLASS 1500 DIMENSIONS

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	61	16	80	6.4	38
3/4	67	21	90	9.7	41
1	76	27	100	9.7	64
1¼	86	35	110	9.7	64
1½	95	41	125	12.7	70
2	140	53	165	12.7	70
2½	162	63	190	15.7	76
3	172	78	205	19.1	76
4	206	102	240	22.4	89
5	251	128	290	28.4	89
6	279	154	320	35.1	89
8	349	203	395	41.1	102
10	432	255	480	50.8	114
12	518	303	570	60.5	114
14	575	333	635	66.5	127
16	638	381	705	76.2	133
18	702	429	775	85.9	146
20	752	478	830	95.3	152
24	899	575	990	111.3	178

SPECTACLE BLIND FLANGE CLASS 2500 DIMENSIONS

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	67	16	90	9.7	38
3/4	73	21	95	9.7	41
1	83	27	110	9.7	64
1¼	102	35	130	12.7	64
1½	114	41	145	15.7	70
2	143	53	170	15.7	70
2½	165	63	195	19.1	76
3	194	78	230	22.4	76
4	232	102	275	28.4	89
5	276	128	325	35.1	89
6	314	154	370	41.1	89
8	384	198	440	53.8	102
10	473	248	540	66.5	114
12	546	289	620	79.2	114

Manufacturing process and features of Spectacle Blind Flange

Manufacturing Process:

Material Selection : Choose appropriate materials such as carbon steel, stainless steel, alloy steel, or other metals based on the application’s requirements for strength, durability, and corrosion resistance.
Cutting : Cut the selected material into circular blanks using cutting methods such as plasma cutting, laser cutting, or water jet cutting. The blanks will have two discs connected by a small section of metal, resembling a pair of glasses or spectacles.
Forming : Use forging or machining to shape the blanks into the desired spectacle blind flange form. This process involves heating the material and pressing it into a die or using machining tools to achieve the precise shape.
Machining : Perform precise machining operations to achieve the required dimensions and specifications. This includes drilling bolt holes, machining the flange faces, and ensuring flatness and parallelism of the surfaces.
Heat Treatment : Apply heat treatment processes like annealing, quenching, and tempering to enhance the mechanical properties such as strength, toughness, and hardness.
Surface Treatment : Apply surface treatments such as galvanizing, painting, or coating to improve corrosion resistance and surface finish, based on the material and application requirements.
Inspection : Conduct thorough inspections to ensure the spectacle blind flanges meet industry standards and specifications. This includes dimensional checks, material testing, and pressure testing if required.

Features of Spectacle Blind Flange :

Isolation Capability : Spectacle blind flanges can isolate a section of the pipeline for maintenance, inspection, or repair by rotating the “blind” side into position.
Dual Functionality : Combines the functions of a blind flange and a spacer in a single component, allowing for quick and easy switching between open and closed states.
Leak-Free Sealing : Provides a secure and leak-free seal, ensuring the integrity of the piping system when the blind side is in use.
Durability : Made from robust materials, spectacle blind flanges are designed to withstand high pressure and temperature conditions, making them suitable for demanding industrial applications.
Corrosion Resistance : Depending on the material and surface treatment, these flanges can offer excellent resistance to corrosion, extending their service life in harsh environments.
Easy Installation and Maintenance : Simplifies the process of isolating sections of the pipeline, reducing downtime during maintenance and inspection activities.
Versatility : Available in various sizes, materials, and pressure ratings to accommodate different piping system requirements.
Safety : Enhances safety by providing a reliable means of isolating sections of the pipeline, preventing accidental flow during maintenance or emergencies.

Application Of Spectacle Blind Flange

Oil and Gas Industry	Used in upstream, midstream, and downstream operations for isolating sections of pipelines during maintenance, inspection, or repair activities. They ensure safety and operational efficiency by preventing the flow of fluids.
Chemical Processing	Found in chemical plants for isolating sections of pipelines that transport corrosive chemicals or hazardous fluids. Spectacle blind flanges provide a secure seal, protecting personnel and equipment during maintenance.
Power Generation	Applied in power plants, including nuclear, thermal, and renewable energy facilities, for isolating sections of steam and water pipelines. They facilitate maintenance and repair without disrupting overall plant operations.
Water Treatment	Utilized in water treatment plants for isolating sections of pipelines that handle treated water, chemicals, and slurry. Spectacle blind flanges ensure efficient maintenance and minimize downtime.
Pulp and Paper Industry	Found in paper mills for isolating sections of pipelines that transport pulp, chemicals, and wastewater. They enable safe and efficient maintenance to enhance operational reliability.
Shipbuilding and Marine Applications	Used in shipyards and marine environments for isolating sections of piping systems onboard vessels and offshore platforms. Spectacle blind flanges support maintenance and repair activities in challenging marine conditions.
Food and Beverage Industry	Applied in food processing plants to isolate sections of sanitary piping systems during cleaning and maintenance. They help maintain hygienic conditions and prevent contamination of food products.
Pharmaceutical Industry	Found in pharmaceutical manufacturing facilities for isolating sections of pipelines that transport sterile fluids and chemicals. Spectacle blind flanges ensure clean and contamination-free operations.
HVAC Systems	Used in heating, ventilation, and air conditioning systems for isolating sections of piping that transport fluids and gases. They support maintenance activities to ensure efficient HVAC system operation.

Spectacle Blind Flange Available Types

Spectacle Blind Flange Manufacturers	Spectacle Blind Flange Exporters
Stainless Steel Spectacle Blind Flange	Forged Steel Raised Face Spectacle Blind Flange
Carbon Steel Spectacle Blind Flange	ANSI B16.47 Spectacle Blind Flange
Alloy Steel Spectacle Blind Flange	Class 150 LBS Spectacle Blind Flange Stockiests
Nickel Alloy Spectacle Blind Flange Suppliers	MSS SP44 Spectacle Blind Flange
Inconel Spectacle Blind Flange Stockiest	Class 300 LBS Spectacle Blind Flange
Alloy Steel Spectacle Blind Flange Exporter	Class 600 LBS Spectacle Blind Flange
Duplex Steel Spectacle Blind Flange Stockists	DIN / EN Spectacle Blind Flange Manufacturers
Titanium Alloy Spectacle Blind Flange	ASME / ANSI B16.5 Spectacle Blind Flange
Super Duplex Steel Spectacle Blind Flange	ANSI / ASME Spectacle Blind Flange
Copper Nickel Spectacle Blind Flange	High Quality Spectacle Blind Flange

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Frequently Asked Questions

Most frequent questions and answers

A spectacle blind flange is a type of flange used to isolate or block off a section of a pipeline. It consists of a dual-plate design with one plate that functions as a blind flange to block the flow and another plate that acts as a spacer to keep the pipeline open. This design allows for the easy isolation of a section of the pipeline for maintenance or inspection without the need to remove the flange from the system.

Spectacle blind flanges are available in a range of sizes to accommodate different pipe diameters and pressure ratings. Standard sizes are offered, and custom sizes can be manufactured to meet specific needs.

Spectacle blind flanges are installed by aligning the flange with the pipeline and bolting it into place. The blind plate is used to block the flow, while the spacer plate keeps the pipeline open. The installation process involves ensuring proper alignment and tight bolting to achieve a secure and effective isolation.

Yes, we offer custom manufacturing solutions for spectacle blind flanges to meet specific requirements. Please contact us with your detailed specifications, and we will work with you to produce flanges tailored to your needs.

The lead time for spectacle blind flanges depends on the complexity and volume of the order. After reviewing your specifications, we will provide an estimated lead time. We are committed to delivering all projects on schedule while maintaining the highest quality standards.

Yes, spectacle blind flanges can be used for both liquid and gas applications, provided they are made from appropriate materials and installed correctly to handle the specific conditions of the system, including pressure and temperature.

Spectacle blind flanges are typically made from materials such as carbon steel, stainless steel, alloy steel, and other metals. The material selection depends on the specific requirements of the application, including the type of fluid or gas, temperature, pressure, and environmental conditions.

Spectacle blind flanges are used in piping systems where there is a need to isolate a section of the pipeline for maintenance or inspection purposes. They are commonly found in industries such as oil and gas, petrochemical, and chemical processing, where ease of isolation and safety are important.

Spectacle blind flanges are manufactured to comply with various industry standards, such as ASME B16.5, ASME B16.47, and API standards. These standards define the dimensions, tolerances, and material requirements to ensure compatibility and reliability in piping systems.

Spectacle blind flanges offer several advantages, including:

Easy isolation: Allows for the quick and easy isolation of a section of the pipeline without removing the flange.
Dual functionality: Provides both blocking and spacing functions with a single unit.
Safety: Enhances safety by allowing maintenance or inspection without disrupting the entire pipeline system.
Convenience: Simplifies the process of switching between open and isolated states.

Regular inspection of spectacle blind flanges involves checking for signs of wear, corrosion, or damage. It is important to ensure that the blind plate and spacer plate are in good condition and that the flange continues to function properly for isolation and spacing.