Name: Spectacle Blind Flanges
Brand: Arrow Piping
Availability: InStock

ASME/ANSI B16.48 Spectacle Blind Flange Manufacturer, Supplier & Exporter

Spectacle Blind Flanges are specialized pipeline isolation components designed to safely control and manage fluid flow within industrial piping systems. They consist of two connected metal discs—one solid disc and one open ring disc—joined by a metal section. The solid side is used to completely stop the flow of media, while the open side allows unrestricted flow when the system is in operation. Their distinctive shape resembles a pair of spectacles, which is how they derive their name. Spectacle Blinds are commonly used in industries such as oil & gas, petrochemicals, refineries, chemical processing, power generation, and water treatment plants where safe pipeline isolation is essential.

These flanges provide a simple and highly effective method for isolating sections of a pipeline during maintenance, inspection, repair work, or system shutdowns. Manufactured from high-quality materials such as Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, and other special alloys, Spectacle Blind Flanges offer excellent strength, corrosion resistance, and durability under demanding operating conditions. They are available in a wide range of sizes, pressure ratings, and specifications in accordance with ASME/ANSI B16.48 standards.

Arrow Piping Solutions is a leading manufacturer, supplier, and exporter of premium-quality Spectacle Blind Flanges designed to meet international quality and performance requirements. Our products are manufactured using advanced production techniques and undergo stringent quality inspections to ensure dimensional accuracy, reliable performance, and long service life. We offer customized solutions in various materials, sizes, and pressure classes to meet the specific needs of industrial projects. With competitive pricing, timely delivery, and dedicated customer support, Arrow Piping Solutions provides dependable piping solutions to clients across global markets.

ASME B16.5 SPECTACLE BLIND FLANGE - (CLASS 150) - DIMENSIONS & WEIGHT

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	45	16	60	3	38
3/4	54	21	70	3	38
1	64	27	80	3	38
1.1/4	73	42	90	6.4	38
1.1/2	83	48	100	6.4	38
2	102	61	120	6.4	51
2.1/2	107	73	140	6.4	51
3	133	89	150	6.4	64
3.1/2	159	102	175	9.7	64
4	172	114	190	9.7	64
5	194	141	215	9.7	76
6	219	168	240	12.7	76
8	276	219	300	12.7	76
10	337	273	360	15.7	102
12	406	324	430	19.1	102
14	448	356	475	19.1	108
16	511	406	460	22.4	108
18	546	457	580	25.4	114
20	603	508	635	28.4	121
24	714	610	750	31.8	140

ASME B16.5 SPECTACLE BLIND FLANGE - (CLASS 300) - DIMENSIONS & WEIGHT

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	45	16	60	3	38
3/4	54	21	70	3	38
1	64	27	80	3	38
1.1/4	73	42	90	6.4	38
1.1/2	83	48	100	6.4	38
2	102	61	120	6.4	51
2.1/2	107	73	140	6.4	51
3	133	89	150	6.4	64
3.1/2	159	102	175	9.7	64
4	172	114	190	9.7	64
5	194	141	215	9.7	76
6	219	168	240	12.7	76
8	276	219	300	12.7	76
10	337	273	360	15.7	102
12	406	324	430	19.1	102
14	448	356	475	19.1	108
16	511	406	460	22.4	108
18	546	457	580	25.4	114
20	603	508	635	28.4	121
24	714	610	750	31.8	140

ASME B16.5 SPECTACLE BLIND FLANGE - (CLASS 900) - DIMENSIONS & WEIGHT

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	45	16	60	3	38
3/4	54	21	70	3	38
1	64	27	80	3	38
1.1/4	73	42	90	6.4	38
1.1/2	83	48	100	6.4	38
2	102	61	120	6.4	51
2.1/2	107	73	140	6.4	51
3	133	89	150	6.4	64
3.1/2	159	102	175	9.7	64
4	172	114	190	9.7	64
5	194	141	215	9.7	76
6	219	168	240	12.7	76
8	276	219	300	12.7	76
10	337	273	360	15.7	102
12	406	324	430	19.1	102
14	448	356	475	19.1	108
16	511	406	460	22.4	108
18	546	457	580	25.4	114
20	603	508	635	28.4	121
24	714	610	750	31.8	140

ASME B16.5 SPECTACLE BLIND FLANGE - (CLASS 1500) - DIMENSIONS & WEIGHT

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	45	16	60	3	38
3/4	54	21	70	3	38
1	64	27	80	3	38
1.1/4	73	42	90	6.4	38
1.1/2	83	48	100	6.4	38
2	102	61	120	6.4	51
2.1/2	107	73	140	6.4	51
3	133	89	150	6.4	64
3.1/2	159	102	175	9.7	64
4	172	114	190	9.7	64
5	194	141	215	9.7	76
6	219	168	240	12.7	76
8	276	219	300	12.7	76
10	337	273	360	15.7	102
12	406	324	430	19.1	102
14	448	356	475	19.1	108
16	511	406	460	22.4	108
18	546	457	580	25.4	114
20	603	508	635	28.4	121
24	714	610	750	31.8	140

ASME B16.5 SPECTACLE BLIND FLANGE - (CLASS 2500) - DIMENSIONS & WEIGHT

NPS	Outside Ø A	Inside Ø B	Center Line C	THK t	Web Width W
1/2	45	16	60	3	38
3/4	54	21	70	3	38
1	64	27	80	3	38
1.1/4	73	42	90	6.4	38
1.1/2	83	48	100	6.4	38
2	102	61	120	6.4	51
2.1/2	107	73	140	6.4	51
3	133	89	150	6.4	64
3.1/2	159	102	175	9.7	64
4	172	114	190	9.7	64
5	194	141	215	9.7	76
6	219	168	240	12.7	76
8	276	219	300	12.7	76
10	337	273	360	15.7	102
12	406	324	430	19.1	102
14	448	356	475	19.1	108
16	511	406	460	22.4	108
18	546	457	580	25.4	114
20	603	508	635	28.4	121
24	714	610	750	31.8	140

Blind Spectacle Flange Standards

The standards for blind spectacle flanges ensure that these components meet the necessary requirements for performance, safety, and compatibility in piping systems. Some key standards for blind spectacle flanges include:

1. ASME/ANSI Standards (American)

ASME B16.5– Pipe Flanges and Flanged Fittings (NPS 1/2" to 24").
ASME B16.47 – Large Diameter Steel Flanges (Series A & B, NPS 26" to 60").
ASME B16.36 – Orifice Flanges.
ASME B16.48 – Line Blanks (Spectacle, Spade, and Spacer Flanges).
ANSI B16.1 – Cast Iron Flanges and Flanged Fittings.
ANSI B16.42 – Ductile Iron Pipe Flanges and Flanged Fittings.

2. ISO Standards (International)

ISO 7005-1 – Steel Flanges for General Applications.
ISO 7005-2 – Cast Iron Flanges.
ISO 7005-3 – Copper Alloy Flanges.

3. EN Standards (European)

EN 1092-1 – Steel Flanges.
EN 1092-2 – Cast Iron Flanges.
EN 1092-3 – Copper Alloy Flanges.
EN 1092-4 – Aluminium Alloy Flanges.

4. DIN Standards (German)

DIN 2527 – Blind Flanges.
DIN 2576 – Slip-On Flanges (PN 10).
DIN 2633 – Weld Neck Flanges (PN 16).
DIN 2634 – Weld Neck Flanges (PN 25).
DIN 2635 – Weld Neck Flanges (PN 40).

5. JIS Standards (Japanese)

JIS B2220 – Steel Pipe Flanges.

6. GOST Standards (Russian)

GOST 12820 – Flat Flanges for Steel Pipe Joints.
GOST 12821 – Steel Welded Flanges for High-Pressure Applications.
GOST 33259 – Flange Connections for Industrial Equipment and Pipelines.

7. BS Standards (British)

BS 4504 – Circular Flanges for Pipes, Valves, and Fittings.
BS 10 – Specification for Flanges and Bolting.

8. API Standards (Oil & Gas)

API 6A – Wellhead and Christmas Tree Equipment Flanges.
API 605 – Large-Diameter Carbon Steel Flanges (merged into ASME B16.47 Series B).

9. AWWA Standards (Waterworks)

AWWA C207 – Steel Ring Flanges for Waterworks Service.

10. MSS Standards (Manufacturer's Standardization Society)

MSS SP-44 – Steel Pipe Flanges (merged into ASME B16.47 Series A).
MSS SP-51 – Flanges for Glass-Lined Equipment.

11. Material-Specific Standards (ASTM)

ASTM A105 – Carbon Steel Forged Flanges.
ASTM A182 – Alloy and Stainless Steel Forged Flanges.
ASTM A350 – Carbon and Low-Alloy Steel Flanges for Low-Temperature Service.
ASTM A694 – High-Strength Carbon and Alloy Steel Flanges for High-Pressure Applications.

12. Other Regional and Specialized Standards

KS B1511 – Korean Standard Flanges.
NF E29-206 – French Standard Flanges.
SANS 1123 – South African Standard for Steel Flanges.

Why Choose Arrow Piping Solutions For Spectacle Blind Flanges?

Arrow Piping Solutions is a trusted manufacturer and supplier of premium-quality Spectacle Blind Flanges, offering reliable solutions for pipeline isolation and flow control applications. Our focus on quality manufacturing, technical excellence, and customer satisfaction enables us to deliver products that perform efficiently even in demanding industrial environments.

Superior Product Quality

Our Spectacle Blind Flanges are manufactured using high-grade raw materials and advanced production techniques to ensure excellent strength, dimensional accuracy, corrosion resistance, and long-term durability.

Compliance with International Standards

We manufacture Spectacle Blind Flanges in accordance with recognized international standards such as ASME, ANSI, ASTM, DIN, and EN specifications. This ensures dependable performance, safety, and compatibility with industrial piping systems.

Comprehensive Quality Assurance

Every Spectacle Blind Flange undergoes strict quality inspections and testing procedures throughout the manufacturing process. This commitment to quality ensures consistent performance and reliability in critical applications.

Technical Knowledge and Support

Our experienced professionals provide expert assistance in selecting the most suitable Spectacle Blind Flange based on project requirements, operating conditions, and industry specifications, ensuring optimal performance and operational safety.

What Is the Purpose of a Spectacle Blind Flange?

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A Spectacle Blind Flange is used to isolate sections of a pipeline during maintenance, inspections, repairs, or system shutdowns.

The solid disc blocks the flow completely, while the open ring section allows normal flow when the pipeline is operational.

What Is the Difference Between a Spectacle Blind Flange and a Blind Flange?

A standard Blind Flange is a solid flange used to permanently or temporarily seal the end of a pipeline. In contrast, a Spectacle Blind Flange consists of both a solid disc and an open ring connected together, allowing operators to switch between flow isolation and flow passage without removing the component entirely.

What Are the Advantages of Using Spectacle Blind Flanges?

Provides a safe and visible method of pipeline isolation.

Simplifies maintenance and inspection procedures.

Reduces system downtime during operational changes.

Offers long service life and reusability.

Eliminates the need for additional isolation components in many applications.

Ideal for industries requiring frequent flow control and system shutdowns.

Spectacle Blind Flange

ASME/ANSI B16.48 Spectacle Blind Flange Manufacturer, Supplier & Exporter