Blind Flanges – ASME/ANSI B16.5

VikTech Fittings is a leading manufacturer, exporter, and supplier of Blind Flanges in compliance with ASME/ANSI B16.5, B16.47, and other international standards. A Blind Flange is used to close the end of a piping system, valve, or pressure vessel, making it essential for inspection, maintenance, and modification operations.

Unlike other flanges, a Blind Flange has no bore (hole) in the center, which makes it suitable for high-pressure sealing applications. They are bolted and gasketed to ensure a leak-proof closure in critical pipelines.

What is a Blind Flange?

A Blind Flange is a solid flange without an opening, used to isolate a section of a piping system or terminate the end of a line. They can be easily removed, providing access for cleaning, inspection, pressure testing, or repairs.

Types of Blind Flanges

• Raised Face Blind Flange (RF-BL)

• Flat Face Blind Flange (FF-BL)

• Ring Type Joint Blind Flange (RTJ-BL)

• Large Diameter Blind Flange (Series A/B)

• Custom / Project-Specific Blind Flanges

Materials & Grades

✅ Carbon Steel Blind Flanges

• ASTM A105 / A105N

• ASTM A350 LF2 (Low Temp)

• ASTM A694 F42–F70

✅ Stainless Steel Blind Flanges

• ASTM A182 F304 / 304L

• ASTM A182 F316 / 316L

• ASTM A182 F321 / F347

✅ Duplex & Super Duplex

• UNS S31803 / S32205

• UNS S32750 / S32760

✅ Alloy Steel Blind Flanges

• ASTM A182 F1, F5, F9, F11, F22, F91

✅ Nickel Alloys & Special Metals

• Inconel 600 / 625 / 800 / 825

• Monel 400 / K500

• Hastelloy C22 / C276

• Alloy 20

• Copper Nickel 70/30, 90/10

• Titanium Gr.2 / Gr.5

Advantages of Blind Flanges

• Complete pipeline isolation for maintenance

• Withstand high pressure & temperature

• Allow pressure testing of pipelines

• Available in all face types (RF, FF, RTJ)

• Strong sealing performance with gaskets

Applications of Blind Flanges

• Oil & Gas pipelines

• Petrochemical plants

• Power generation & boiler systems

• Water treatment & desalination plants

• Marine & offshore applications

• Pharmaceutical & chemical processing

Technical Specifications

Specification ItemDetailsStandardASME/ANSI B16.5, B16.47 Series A/B, DIN, EN 1092-1, JIS B2220, BS 4504Size Range½” (DN15) to 48” (DN1200)Pressure RatingClass 150, 300, 600, 900, 1500, 2500Facing TypesRF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint)TestingPMI, UT, Hydro Test, NDT, NACE MR0175, Third-Party InspectionCertificationEN 10204 3.1 / 3.2, ISO, CE