Blind Flange

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

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Specification
Material & Grades
Dimensions

Standard Specification of Blind Flange

Dimensions	ANSI B16.5, ANSI B16.47 Series A & B, ASA, API-605, MSS SP44, AWWA, Custom Drawings
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)
DIN	DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
BS	BS4504 , BS4504, BS1560, BS10
Class	150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
Class / Pressure Rating	150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.

Material & Grades of Blind Flange

Stainless Steel	ASTM A-479, A-182, 304, 304L,304H,304S, 316, 316L,316 Ti, 316H, 309, 310, 310S, 317L, 321, 347, 409, 410, 420, 430, 440, 446, 904L. etc.
Duplex & Super Duplex Steel	S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 & ASTM / ASME A/SA 182, A240 F 44, F 45, F51, F 53, F 55, F 60, F 61
Carbon Steel	ASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS 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 Blind Flange

Spectacle Blind Flange 2500 Lbs:

PIPE SIZE	Spectacle Blinds 2500# Flange
PIPE SIZE	A	B	C	D	E	F
1/2″	0.625	2.625	3.5	–	1.50	3/8
3/4″	0.82	2.875	3.75	0.875	1.625	3/8
1″	1.05	3.25	4.25	1.0	2.5	3/8
1-1/4″	1.38	4.0	5.125	1.125	2.5	1/2
1-1/2″	1.61	4.5	5.75	1.25	2.75	5/8
2″	2.07	5.625	6.75	1.125	2.75	5/8
2-1/2″	2.47	6.5	7.75	1.25	3.0	3/4
3″	3.07	7.625	9.0	1.375	3.0	7/8
4″	4.03	9.125	10.75	1.625	3.5	1-1/8
5″	5.05	10.875	12.75	1.875	3.5	1-3/8
6″	6.06	12.375	14.5	2.125	3.5	2
8″	7.81	15.125	17.25	2.125	4.0	2-1/8
10″	9.75	18.625	21.25	2.625	4.5	2-5/8
12″	11.37	21.5	24.375	2.875	4.5	3-1/8

Spectacle Blind Flange 1500 Lbs:

PIPE SIZE	Spectacle Blind 1500# Flanges
PIPE SIZE	A	B	C	D	E	F
1/2″	0.625	2.375	3.25	–	1.50	1/4
3/4″	0.82	2.625	3.50	0.875	1.625	3/8
1″	1.05	3.0	4.0	1.0	2.5	3/8
1-1/4″	1.375	3.375	4.375	1.0	2.5	3/8
1-1/2″	1.61	3.75	4.875	1.125	2.75	1/2
2″	2.07	5.5	6.5	1.0	2.75	1/2
2-1/2″	2.47	6.375	7.5	1.125	3.0	5/8
3″	3.07	6.75	8.0	1.25	3.0	3/4
4″	4.03	8.125	9.5	1.375	3.5	7/8
5″	5.05	9.875	11.5	1.625	3.5	1-1/8
6″	6.06	11.0	12.5	1.5	3.5	1-3/8
8″	7.98	13.75	15.5	1.75	4.0	1-5/8
10″	10.02	17.0	19.0	2.0	4.5	2
12″	11.94	20.375	22.5	2.125	4.5	2-3/8
14″	13.12	22.625	25.0	2.375	5.0	2-5/8
16″	15.0	25.125	27.75	2.625	5.25	3
18″	16.88	27.625	30.5	2.875	5.75	3-3/8
20″	18.81	29.625	32.75	3.125	6.0	3-3/4
24″	22.62	35.375	39.0	3.625	7.0	4-3/8

Spectacle Blind Flange 900 Lbs:

PIPE SIZE	Spectacle Blind 900# Flange
PIPE SIZE	A	B	C	D	E	F
1/2″	0.625	2.375	3.25	–	1.50	1/4
3/4″	0.0825	2.625	3.50	0.875	1.625	1/4
1″	1.05	3.0	4.0	1.0	2.25	1/4
1-1/4″	1.44	3.375	4.375	1.0	2.25	3/8
1-1/2″	1.68	3.5	4.875	1.125	2.625	3/8
2″	2.16	5.5	6.5	1.0	2.25	1/2
2-1/2″	2.64	6.375	7.5	1.125	2.625	1/2
3″	3.25	6.5	7.5	1.0	2.625	5/8
4″	4.25	8.0	9.25	1.25	3.0	3/4
5″	5.3	9.625	11.0	1.375	3.375	7/8
6″	6.36	11.25	12.5	1.25	3.375	1
8″	8.33	14.0	15.5	1.5	3.75	1-3/8
10″	10.42	17.0	18.5	1.5	4.125	1-5/8
12″	12.39	19.5	21.0	1.5	4.125	1-7/8
14″	13.62	20.375	22.0	1.625	4.5	2-1/8
16″	15.62	22.5	24.25	1.75	4.875	2-3/8
18″	17.62	25.0	27.0	2.0	5.25	2-5/8
20″	19.56	27.375	29.5	2.125	5.25	2-7/8
24″	23.5	32.875	35.5	2.625	6.0	3-1/2

Spectacle Blind Flange 600 Lbs:

PIPE SIZE	Spectacle Blind 600# Flange
PIPE SIZE	A	B	C	D	E	F
1/2″	5/8	2	2-5/8	5/8	1-1/2	1/4
3/4″	13/16	2-1/2	3-1/4	3/4	1-1/2	1/4
1″	1-1/8	2-3/4	3-1/2	3/4	2-1/4	1/4
1-1/4″	1-7/16	3-1/8	3-7/8	3/4	2-1/4	3/8
1-1/2″	1-11/16	3-5/8	4-1/2	7/8	2-5/8	3/8
2″	2-1/8	4-1/4	5	3/4	2-1/4	3/8
2-1/2″	2-5/8	5	5-7/8	7/8	2-5/8	1/2
3″	3-1/4	5-3/4	6-5/8	7/8	2-5/8	1/2
3-1/2″	3-3/4	6-1/4	7-1/4	1	3	5/8
4″	4-1/4	7-1/2	8-1/2	1	3	5/8
5″	5-1/4	9-3/8	10-1/2	1-1/8	3-3/8	3/4
6″	6-3/8	10-3/8	11-1/2	1-1/8	3-3/8	7/8
8″	8-3/8	12-1/2	13-3/4	1-1/4	3-3/4	1-1/8
10″	10-7/16	15-5/8	17	1-3/8	4-1/8	1-3/8
12″	12-3/8	17-7/8	19-1/4	1-3/8	4-1/8	1-5/8
14″	13-5/8	19-1/4	20-3/4	1-1/2	4-1/2	1-3/4
16″	15-5/8	22-1/8	23-3/4	1-5/8	4-7/8	2
18″	17-5/8	24	25-3/4	1-3/4	5-1/4	2-1/8
20″	19-5/16	26-3/4	28-1/2	1-3/4	5-1/4	2-1/2
24″	23-1/2	31	33	2	6	2-7/8

Spectacle Blind Flange 300 Lbs:

PIPE SIZE	Spectacle Blind 300# Flange
PIPE SIZE	A	B	C	D	E	F
1/2″	5/8	2	2-5/8	5/8	1-1/2	1/4
3/4″	13/16	2-1/2	3-1/4	3/4	1-1/2	1/4
1″	1-1/8	2-3/4	3-1/2	11/16	1-1/2	1/4
1-1/4″	1-5/8	3-1/8	3-7/8	11/16	1-1/2	1/4
1-1/2″	1-7/8	3-5/8	4-1/2	7/8	2	1/4
2″	2-3/8	4-1/4	5	3/4	2	3/8
2-1/2″	2-7/8	5	5-7/8	7/8	2-1/2	3/8
3″	3-1/2	5-3/4	6-5/8	7/8	2-1/2	3/8
3-1/2″	4	6-3/8	7-1/4	7/8	2-1/2	1/2
4″	4-1/2	7	7-7/8	7/8	2-1/2	1/2
5″	5-5/8	8-3/8	9-1/4	7/8	3	5/8
6″	6-5/8	9-3/4	10-5/8	7/8	3	5/8
8″	8-5/8	12	13	1	3-1/2	7/8
10″	10-3/4	14-1/8	15-1/4	1-1/8	4	1
12″	12-3/4	16-1/2	17-3/4	1-1/4	4	1-1/8
14″	14	19	20-1/4	1-1/4	4-3/4	1-1/4
16″	16	21-1/8	22-1/2	1-3/8	4-7/8	1-1/2
18″	18	23-3/8	24-3/4	1-3/8	4-1/2	1-5/8
20″	20	25-5/8	27	1-3/8	4-3/4	1-3/4
24″	24	30-3/8	32	1-5/8	5-1/2	2

Spectacle Blind Flange 150 Lbs:

PIPE SIZE	Spectacle Blind 150# Flange
PIPE SIZE	A	B	C	D	E	F
1/2″	5/8	1-3/4	2-3/8	5/8	1-1/2	1/4
3/4″	13/16	2-1/8	2-3/4	5/8	1-1/2	1/4
1″	1-1/8	2-1/2	3-1/8	9/16	1-1/2	1/4
1-1/4″	1-5/8	2-7/8	3-1/2	9/16	1-1/2	1/4
1-1/2″	1-7/8	3-1/4	3-7/8	9/16	1-1/2	1/4
2″	2-3/8	4	4-3/4	11/16	2	1/4
2-1/2″	2-7/8	4-3/4	5-1/2	11/16	2	1/4
3″	3-1/2	5-1/4	6	11/16	2-1/2	1/4
3-1/2″	4	6-1/4	7	3/4	2-1/2	3/8
4″	4-1/2	6-3/4	7-1/2	3/4	2-1/2	3/8
5″	5-9/16	7-5/8	8-1/2	7/8	3	3/8
6″	6-5/8	8-5/8	9-1/2	7/8	3	1/2
8″	8-5/8	10-7/8	11-3/4	7/8	3	1/2
10″	10-3/4	13-1/4	14-1/4	1	4	5/8
12″	12-3/4	16	17	1	4	3/4
14″	14	17-5/8	18-3/4	1-1/8	4-1/4	3/4
16″	16	20-1/8	21-1/4	1-1/8	4-1/4	7/8
18″	18	21-1/2	22-3/4	1-1/4	4-1/2	1
20″	20	23-3/4	25	1-1/4	4-3/4	1-1/8
24″	24	28-1/8	29-1/2	1-3/8	5-1/2	1-1/4

Manufacturing process and features of Blind Flange

A Blind Flange is a type of pipe fitting used to close the end of a piping system or pressure vessel openings. It allows for the secure sealing of pipelines, providing an essential function in various industrial applications. Here’s an overview of its manufacturing process and features:

Manufacturing Process:

Material Selection : Choose appropriate materials like carbon steel, stainless steel, or alloy steel based on application requirements.
Cutting : Raw material is cut to the required size using a cutting machine or torch.
Forging : The cut material is heated and forged into shape under high pressure to improve strength and grain structure.
Machining : The forged piece is machined to precise dimensions using CNC machines, ensuring the flange meets specified tolerances.
Drilling : Bolt holes are drilled as per flange standards like ANSI B16.5, ensuring accurate alignment for bolting.
Heat Treatment : The flange undergoes heat treatment processes like annealing, normalizing, or quenching to enhance mechanical properties.
Surface Finishing : The flange surface is finished by processes like sandblasting or polishing to remove any impurities and improve appearance.
Inspection and Testing : Non-destructive tests (NDT) such as ultrasonic testing, radiographic testing, or magnetic particle inspection are conducted to ensure the integrity and quality of the flange.
Marking : The flange is marked with relevant specifications, such as material grade, size, pressure rating, and standard.
Packaging : The finished flanges are carefully packaged to prevent damage during transportation.

Features of Blind Flange:

Sealability : Designed to provide a secure seal, preventing leakage in piping systems.
Versatility : Suitable for a wide range of applications in various industries, including oil and gas, chemical, power, and water supply.
Strength : Forged from high-quality materials, ensuring durability and the ability to withstand high pressure and temperature.
Precision : Manufactured to exact dimensions and tolerances, ensuring proper fit and alignment with other piping components.
Corrosion Resistance : Available in materials that offer excellent resistance to corrosion and wear, enhancing longevity in harsh environments.
Customizability : Can be manufactured in various sizes, materials, and pressure ratings to meet specific application requirements.
Ease of Installation : Designed for easy installation and removal, facilitating maintenance and modifications in piping systems.
Standards Compliance : Produced in accordance with international standards like ANSI, ASME, and ASTM, ensuring compatibility and reliability.
Cost-Effectiveness : Provides an economical solution for sealing the ends of pipes, especially in systems that may require future expansion or modifications.
Safety : Enhances the safety of piping systems by providing a reliable means of isolating sections for maintenance and repairs.

Blind Flanges are essential fittings that provide reliable sealing in piping systems. They offer durability, versatility, and ease of installation, making them suitable for a wide range of industrial applications.

Application Of Blind Flanges

Oil and Gas	Stainless Steel Blind Flanges: Used to cap off pipelines, providing a secure and leak-proof seal in oil and gas transportation systems.
Chemical Industry	Blind Raised Face Flanges: Employed to isolate sections of piping systems during maintenance or modifications, ensuring safe handling of chemicals.
Plumbing	Alloy Steel BLRF Flanges: Used in plumbing systems to close off unused openings and prevent leakage.
Heating Systems	Flat Faced Blind Flanges: Utilized in heating systems to block off the ends of pipes, ensuring efficient and safe operation.
Water Supply	Blind Pipe Flanges: Applied to seal off water supply pipelines, maintaining pressure and preventing leaks.
Power Plants	ANSI B16.5 Blind Forged Flanges: Essential in power plants for sealing high-pressure and high-temperature piping systems, ensuring safety and reliability.
Paper & Pulp	Blind Plate Flanges: Used to block off sections of piping in paper and pulp processing, allowing for maintenance and modifications without disrupting operations.
General Use	Blind Flanges: Widely used to seal off piping systems in various general-purpose applications, providing flexibility and safety.
Fabrication	Steel Blind Flanges: Utilized in the fabrication of structures and piping systems, providing secure closures and ease of access for future modifications.
Food Processing	Blind Flange: Used to seal off sanitary piping systems, ensuring hygiene and preventing contamination in food processing applications.
Structural Pipes	Blind Flanges: Applied to close off structural pipes, ensuring stability and preventing ingress of foreign materials.

Blind Flange Available Types

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

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Frequently Asked Questions

Most frequent questions and answers

A blind flange is a type of pipe flange used to seal the end of a pipe or a flange connection. Unlike other flanges, a blind flange has no central opening and is designed to cover the end of a pipeline, effectively blocking the flow of fluids or gases. It is commonly used to terminate a pipeline or to facilitate future connections or maintenance.

Blind flanges are available in a range of sizes to match different pipe diameters and flange standards. Standard sizes typically range from 1/2 inch to 36 inches or more. Custom sizes and specifications can also be manufactured to meet specific needs.

Blind flanges are installed by bolting them onto the end of a pipe or flange connection using bolts and gaskets. A proper gasket is typically used between the flange and the pipe to ensure a leak-proof seal. The flange is then tightened using a wrench or a torque tool to achieve a secure connection.

Yes, we offer custom manufacturing solutions for 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 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, 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.

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

Blind flanges are used in various industries, including oil and gas, petrochemical, water treatment, and construction. They are essential for sealing the ends of pipes, isolating sections of piping for maintenance, or terminating a pipeline. They also facilitate pressure testing and future modifications of the pipeline system.

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.

Blind flanges offer several advantages, including:

Sealing: Provides a secure closure for the end of a pipe or flange connection.
Versatility: Suitable for a wide range of applications, including maintenance and future modifications.
High strength and durability: Made from robust materials to handle high pressure and temperature conditions.
Compliance with standards: Ensures quality and reliability in piping systems.

Regular inspection of blind flanges involves checking for leaks and ensuring that the flange remains securely bolted. It is important to inspect for any signs of corrosion, wear, or damage that could affect the integrity of the seal.