Blind Flange ANSI B16.5

Product Description

Our ANSI B16.5 Blind Flanges are manufactured in accordance with ASME standards, designed to seal off the ends of piping systems or pressure vessel openings. They are available in a wide range of pressure classes from 150 to 2500, with materials including carbon steel (A105), stainless steel (SS304/SS316), and other alloys.

Available with Raised Face (RF) or Ring Type Joint (RTJ) sealing surfaces, our blind flanges ensure a secure and leak-proof connection, suitable for high-pressure and corrosive environments.

Key Features & Functions

• Full Solid Design (No Bore)
  Completely blocks flow, ensuring safe and reliable system isolation.

• ANSI / ASME B16.5 Compliance
  Outside diameter, bolt circle, bolt holes, and thickness strictly follow B16.5 requirements.

• High Pressure Capability
  Available in pressure classes:
  Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500

• Wide Material Options

• Carbon Steel: ASTM A105

• Stainless Steel: ASTM A182 F304 / F316

• Alloy Steel: ASTM A182 F11 / F22 (on request)

• Multiple Facing Types

• RF (Raised Face)

• FF (Flat Face)

• RTJ (Ring Type Joint)

Applications

ANSI B16.5 Blind Flanges are widely used in:

• Fire protection piping systems

• Oil & gas pipelines

• Petrochemical and chemical plants

• Power generation facilities

• Water treatment and industrial piping systems

• Pumps, valves, and pressure vessels

Installation Process

1. Inspection

• Confirm flange size, pressure class, material, and facing type.

• Check sealing surface for damage or deformation.

2. Gasket Placement

• Select a suitable gasket (rubber, graphite, spiral wound, or RTJ gasket).

• Ensure proper alignment and centering.

3. Bolt Alignment

• Align the blind flange with the mating flange bolt holes.

4. Bolt Tightening

• Tighten bolts gradually using a cross (diagonal) tightening pattern.

• Apply uniform torque to avoid leakage.

5. Pressure Testing (If Required)

• Recheck bolt tightness before system pressure testing.

Flange production process

Factory Showcase

FAQ

Q1: What are the common types of flanges you supply?

A: We supply a wide range of forged steel flanges, including Blind Flange, Weld Neck Flange, Slip On Flange, Socket Weld Flange, Threaded Flange, and Lap Joint Flange, all conforming to international standards like ANSI/ASME B16.5 and EN1092-1.

Q2: What materials are available for your flanges?

A: We offer flanges in various materials such as Carbon Steel (A105), Stainless Steel (SS304, SS316), and Alloy Steel (F11, F22, etc.). Material customization is available based on project requirements.

Q3: What standards and pressure classes do you support?

A: Our flanges conform to standards including ANSI/ASME B16.5, EN 1092-1, and DIN. Pressure classes range from Class 150 to 2500 (ANSI) and PN6 to PN100 (EN/DIN).

Q4: Do you provide sealing face options like RF or RTJ?

A: Yes. We offer Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) sealing surfaces depending on pressure, sealing performance, and customer requirements.

Q5: What surface treatments are available?

A: Surface treatments include anti-rust oil, black painting, galvanizing, yellow transparent varnish, and custom coatings for corrosive environments.

Q6: Can you provide certificates and test reports?

A: Yes. We provide MTC (EN10204 3.1/3.2), as well as ISO, CE, FM/UL certificates (depending on product type). Third-party inspections like SGS, BV, and TUV are also available.

Q7: What is your typical production lead time?

A: For standard flanges, lead time is usually 30–35 days. For urgent needs or large volumes, we can offer fast-track production based on stock and raw material availability.

Q8: Do you accept OEM branding or customized packaging?

A: Yes. We support OEM logo stamping, custom labels, and export packaging with your brand or specifications.

Q9: Can I request a sample before confirming an order?

A: Absolutely. We are happy to provide free or paid samples for quality inspection, depending on the product type and destination.