Blind Flange (BLRF / BLFF / BLRTJ)

1️⃣ Product Introduction 

VikTech Fittings is a trusted manufacturer, exporter, and supplier of premium-quality Blind Flanges, manufactured in compliance with ASME standards including ASME B16.5 and ASME B16.47, along with DIN and EN standards.

A Blind Flange is used to seal the end of a piping system, pressure vessel opening, or valve connection. Unlike other flange types, it does not have a bore and is designed to withstand internal pressure loads safely.

Blind flanges are ideal for maintenance shutdowns, future expansion provisions, pressure testing, and isolation of pipelines. Due to their solid construction, they are suitable for high-pressure and high-temperature applications.

2️⃣ Technical Specifications

Product Name        Blind Flange (BLRF / BLFF / BLRTJ)

Standards                ASME B16.5, ASME B16.47 Series A & B, EN 1092-1, DIN

Size                         Range½″ (DN15) to 60″ (DN1500)

Pressure Class        Class 150, 300, 400, 600, 900, 1500, 2500

Facing Types          RF, FF, RTJ

Manufacturing         Forged / Plate Cut

Bore                        Solid (No Bore)

Certification            EN 10204 3.1 / 3.2, IBR, PED (On Request)

3️⃣ Available Material Grades

▶ Carbon Steel (CS)

• ASTM A105

• ASTM A350 LF2

• ASTM A694 F42 / F52 / F60 / F65 / F70

▶ Mild Steel (MS)

• IS 2062 E250

• IS 2041

▶ Stainless Steel (SS)

• ASTM A182 F304 / 304L

• F316 / 316L

• F310

• F321

• F347

▶ Alloy Steel

• ASTM A182 F1

• F5, F9

• F11, F22

• F91

▶ Duplex & Super Duplex

• F51 (UNS S31803)

• F60 (UNS S32205)

• F53 (UNS S32750)

• F55 (UNS S32760)

▶ Nickel Alloys

• Inconel 600 / 625 / 800 / 825

• Monel 400

• Hastelloy C22 / C276

• Alloy 20

▶ Copper Nickel

• 70/30

• 90/10

4️⃣ Size & Pressure Class Range

• Size: ½″ to 60″

• Pressure Ratings: Class 150 to 2500

• PN Ratings: PN6 to PN400

• Custom drilling and thickness available

Blind flanges are generally thicker than other flange types to withstand internal pressure forces.

5️⃣ Standards & Compliance

• ASME B16.5 (Up to 24″)

• ASME B16.47 Series A & B (Above 24″)

• EN 1092-1

• DIN Standards

• ISO Certified Manufacturing

• IBR Approved Supply

• PED Compliant (European Projects)

6️⃣ Design & Dimensional Features

• Solid disc without bore

• Bolt holes drilled as per flange standard

• Heavy thickness for pressure resistance

• Available in Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ)

• Suitable for high stress applications

Dimensional tolerances strictly maintained as per ASME standards.

7️⃣ Manufacturing & Heat Treatment

• Closed die forging or plate cutting

• CNC machining

• Drilling & facing

• Serration machining (for RF)

• Heat treatment (if required)

• Surface finishing

• Final inspection

8️⃣ Pressure & Temperature Ratings

MaterialTemperature RangePressure ClassCarbon SteelUp to 425°CClass 150 – 2500Stainless SteelUp to 870°CPN6 – PN400Alloy SteelUp to 590°CClass 300 – 2500DuplexUp to 300°CHigh pressure service

(Refer ASME pressure-temperature chart for exact rating.)

9️⃣ Testing & Quality Control

✔ Hydrostatic Pressure Testing
✔ Ultrasonic Testing
✔ PMI Testing
✔ Impact Testing (Low Temp Grades)
✔ Hardness & Tensile Testing
✔ Dimensional Inspection
✔ Third Party Inspection – TUV / BV / SGS / Lloyd’s
✔ 100% Heat Number Traceability

🔟 Applications & Industries

• Oil & Gas Pipelines

• Refineries

• Petrochemical Plants

• Power Plants

• Offshore Platforms

• Pressure Vessels

• Boiler Systems

• Chemical Processing

• Water & Utility Lines

Blind Flanges are especially used for pipeline isolation, testing, and future tie-ins.

1️⃣1️⃣ Surface Finish Options

• Anti-Rust Oil

• Black Paint

• Hot Dip Galvanized

• FBE Coating

• Epoxy Coating

• Zinc Coated

1️⃣2️⃣ Packing & Marking

• Wooden crates / fumigated pallets

• Plastic face protectors

• Bubble wrapping

• Marking: Size, Grade, Class, Heat No., Standard

• Custom project marking

• Seaworthy export packing

1️⃣3️⃣ Why Choose VikTech Fittings?

• Strong forging quality

• Accurate drilling & machining

• Heavy thickness availability

• Fast delivery for shutdown projects

• Competitive project pricing

• International export capability

• Complete documentation & certification support

1️⃣4️⃣ SEO Keywords

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