Can you match blind flange thickness to high-pressure design specs?

Yes, we supply custom thicknesses beyond standard tables to meet Class 1500 and 2500 ratings. We use stress calculations based on ASME Section VIII, Division 1 guidelines. This helps avoid overdesign while still maintaining full pressure integrity.

Do your blind flanges support full traceability for audits?

Yes, every flange comes with heat numbers and MTRs traceable to the original mill. We also provide EN 10204 3.1 or 3.2 certificates as required. Our batch control system simplifies inspection processes during plant audits.

Blind Flanges

Unmonitored pipe ends risk internal leakage, maintenance hazards, and pressure imbalance. Our Blind Flanges solve these issues by providing a solid termination point with zero bore, eliminating flow paths under any pressure

Standard Specification

ASME B16.5, ASME B16.47, EN 1092-1, DIN 2527, API 6A, MSS SP-44

Pressure Rating

Class 150 to 2500 (PN6 to PN100) [Highest among flanges – no bore pressure loss]

Material

Carbon Steel (ASTM A105), Stainless Steel (ASTM A182 F304/F316), Alloy Steel (ASTM A694 F52)

Nominal Size

½” to 60″ (DN15 to DN1500) [Custom sizes up to 120″ (DN3000) available]

Flange Type

Blind (BL) – Solid disc for pipe/system termination

Product Description

They handle up to Class 2500 loads with matching bolt circle alignment for secure sealing. We offer materials from A105 to F316 and F52, covering both low- and high-temperature services across oil, gas, water, or chemical lines.

Facing Type

Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ)

Dimensions

Thickness varies by pressure class [Custom thickness for high-pressure applications]

Bolt Circle Diameter

Matches mating flange standard (ASME B16.5/EN 1092-1)

Number & Size of Bolt Holes

4 to 48 holes (½” to 1¼” bolts) [Matches mating flange pattern]

Surface Finish

Machined (125-250 RA), Serrated (for better gasket grip)

Corrosion Resistance

SS316/L: High resistance; Carbon Steel: Rubber-lined/Clad options

Temperature Rating

-196°C to +800°C (material-dependent) [No flow limitations]

Material Certification

MTR, EN 10204 3.1/3.2, NACE MR0175, PED 2014/68/EU

Gasket Compatibility

All types (full-face gaskets common)

Coating/Plating

FBE Coating, 3LPE, Galvanized (HDG), Xylan

Manufacturing Method

Forged (ASTM A105/A182), Plate-cut (ASME SA516 Gr.70), Cast (A216 WCB)

Technical Advantages

Blind flanges carry no internal bore, eliminating pressure loss and simplifying inline sealing. Thickness and bolt patterns match ASME, DIN, or EN norms, enabling fast integration with standard pipe assemblies.
We support serrated or machined finishes (125–250 RA) to improve gasket grip without surface fatigue. Custom thickness or oversized flanges up to DN3000 are also available for heavy-plant installations or high-pressure manifolds.

Let's Get Started

Need reliable Flanges for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Industry Applications

Petrochemical Plant Shutoff Sections

Blind flanges isolate unused headers under Class 900+ pressure ratings, helping meet API 6A zone-sealing protocols.

Offshore Oil Rigs

F316 RTJ-faced units resist crevice corrosion and ensure tight closure in salt spray and H₂S-prone environments.

Power Plant Steam Systems

Our forged A105 units endure over 500°C in superheated lines, reducing unplanned system outages during inspection.

Water Treatment Plants

Custom PN16 flanges in rubber-lined carbon steel isolate pipe ends during valve replacements or tank maintenance.

Natural Gas Metering Skids

We supply NACE MR0175-certified blind flanges to cap line extensions under 1480 psi for leak-free closure.

Hydraulic Test Rigs

Solid disc flanges tested to 1.5x design pressure enable reliable sealing for pressure cycle evaluations.

Pipe Line Isolation without Flow Loss

Reliable sourcing means knowing your closure point won’t compromise safety or function. Our team works directly with plant engineers to match material grades, test certificates, and coating specs to your need.
We support EN 10204 3.1 or 3.2, PED, and NACE compliance with full traceability from raw forging to final dispatch. With in-house FBE, 3LPE, and Xylan coating, we eliminate third-party delays.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

Will the flange match my existing bolt hole pattern?

We manufacture all flanges to match ASME B16.5, B16.47, or EN 1092-1 patterns. You only need to share the mating flange standard or drawing. We’ll match the bolt circle diameter and number of holes exactly.

Do you supply coatings that meet offshore or chemical service specs?

Yes, we offer FBE, 3LPE, HDG, and Xylan coatings applied in-house. Each coating type meets project-specific chemical and temperature resistance standards. We can also advise based on H₂S, salt spray, or acidic exposure levels.

Can you supply large-diameter flanges for plant headers?

Yes, we manufacture up to DN3000 (120 inches) with plate-cut or forged construction. These are commonly used in shutdown headers or expansion joints. We support transport-ready packing with lifting holes or skid-mounted crating.

Do you support urgent or shutdown-based delivery timelines?

Yes, we prioritize shutdown-critical orders with accelerated production slots

Dedicated planning ensures short lead times for Class-rated flanges

In-house forging, machining, and coating reduce external delays

Real-time production updates keep your procurement team aligned

Can Frigate handle bulk or project-based flange supply?

We support EPC contractors and large-scale plant projects

Batch production ensures consistency across high-volume orders

Custom packaging and tagging simplify site-wise material identification

Flexible logistics options for domestic and export shipments

Do you provide technical support during specification or design stages?

Our engineers assist with material selection and pressure class optimization

We review drawings to ensure compliance with ASME, DIN, or project specs

Recommendations provided for gasket compatibility and facing types

Helps reduce redesign cycles and avoid procurement mismatches

How does Frigate ensure consistent quality across every batch?

Strict adherence to QA/QC plans aligned with international standards

Dimensional, PMI, and pressure-related checks before dispatch

Traceability maintained from raw material to finished flange

Third-party inspection (TPI) support available on request

What makes Frigate a reliable long-term flange manufacturing partner?

End-to-end manufacturing under one roof for full process control

Proven track record across oil & gas, power, and chemical industries

Capability to scale from standard supply to fully customized solutions

Strong focus on documentation clarity and audit-ready compliance

Get Clarity with Our Manufacturing Insights

How Frigate Helps in Supply chain Communication and Collaboration

In today’s dynamic business landscape, a well-oiled supply chain is no longer a luxury; it’s...

How to Select the Best CNC Metal Alloy for Your Machined Part

Selecting the right CNC metal alloy for your machined part is one of the most critical decisions that...

How Cutting Tool Selection Impacts Your CNC Part’s Lifespan

Cutting tool selection is a foundational factor that directly impacts the service life and performance...

The Benefits of High-Speed CNC Machining for Rapid Prototyping

Rapid prototyping is critical in product development, yet companies often face significant roadblocks....

Where to Buy Custom CNC Machined Jigs and Fixtures with Quick Delivery

Custom CNC Machined Jigs and Fixtures are foundational elements in precision manufacturing environments....

How Welding Cables Ensure Power and Safety in High-Temperature Operations

High-temperature environments in aerospace, automotive, and heavy manufacturing introduce complex challenges....

How Power Efficient Toroidal Transformers Save Energy and Costs

Energy consumption remains a top operational concern across critical industries such as medical electronics,...

Where to Source Complex CNC Machining for Composite Material Parts

Composite materials have become essential across high-performance industries. Advanced sectors such as...

Optimizing Space and Performance - The Compact Toroidal Transformers Advantages

Power systems across advanced industries are evolving rapidly, demanding higher energy efficiency, reduced...

Key Inspection Requirements in Aerospace Component Machining

Aircraft components operate under continuous stress, vibration, pressure variation, and...

We'd love to Manufacture for you!

Submit the form below and our representative will be in touch shortly.

LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Other Locations

GENERAL ENQUIRIES

LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Components Built for Critical Performance

Engineered Products for Critical Applications

Blind Flanges

Standard Specification

Pressure Rating

Material

Nominal Size

Flange Type

Product Description

Facing Type

Dimensions

Bolt Circle Diameter

Number & Size of Bolt Holes

Surface Finish

Corrosion Resistance

Temperature Rating

Material Certification

Gasket Compatibility

Coating/Plating

Manufacturing Method

Technical Advantages

Let's Get Started

Industry Applications

Pipe Line Isolation without Flow Loss

Related products

Weld Neck Flanges

Having Doubts? Our FAQ

Get Clarity with Our Manufacturing Insights

We'd love to Manufacture for you!

LOCATIONS

Registered Office

Operations Office

Other Locations

GENERAL ENQUIRIES

LOCATIONS

Registered Office

Other Locations

GENERAL ENQUIRIES

Get Your Quote Now

Blind Flanges

Get Latest Price

Blind Flanges

Get Latest Price