Features and applications of ASME B16.47 welding neck and blind flanges
Flanges play a crucial role in pipeline systems, providing secure connections between pipes, valves, and equipment. Among various flange standards, ASME B16.47 is designed specifically for large-diameter flanges (≥26 inches), making it a preferred choice in industries like oil & gas, petrochemicals, and LNG processing. In this article, we will explore the features, types, and applications of ASME B16.47 welding neck (WN) and blind flanges and how Haihao Group ensures top-quality production.
Weld Neck Flange RF ASME B16.47A A105
What is ASME B16.47? (Series A vs. Series B)
ASME B16.47 covers large-diameter flanges ranging from 26″ to 60″, used in high-pressure and high-temperature pipeline systems. This standard is divided into two series:
Series A :
- Heavier and thicker flanges
- Higher pressure resistance
- Commonly used in oil & gas and high-pressure applications
Series B :
- Lighter and thinner compared to Series A
- Lower bolt stress, making it easier to install
- Preferred for low-pressure and moderate-temperature applications
Choosing Between Series A & Series B: If the application involves high pressure, extreme temperatures, or critical service conditions, Series A is typically recommended. Series B is used when cost-effectiveness and lighter weight are priorities.
ANSI B16.47 ASTM A105 blind flanges
Welding Neck Flange (WN) vs. Blind Flange (BF)
Welding Neck Flange (WN Flange)
A welding neck flange features a long, tapered hub that reduces stress concentration at the pipe connection. This makes it ideal for high-pressure and high-temperature applications. It provides:
- Excellent strength and load-bearing capacity
- Smooth fluid flow with minimal turbulence
- Strong resistance to bending and fatigue
A blind flange is a solid plate used to terminate or isolate a pipeline. It allows for system shutdown, maintenance, or pressure testing. Key benefits include:
- Complete isolation of the pipeline
- Easy installation and removal for maintenance
- High-pressure resistance
Applications of ASME B16.47 Flanges
ASME B16.47 weld neck flange and blind flanges are widely used in:
- Oil & Gas Industry (Pipelines, refineries, offshore platforms)
- Petrochemical Plants (Processing units, reactors)
- Power Generation (Steam and gas turbines)
- LNG Processing (Cryogenic storage and transport)
- Shipbuilding & Marine Engineering
How Haihao Group Ensures Top-Quality ASME B16.47 Flanges?
At Haihao Group, we specialize in manufacturing high-quality large-diameter flanges that meet international standards. Our key quality control measures include:
Strict Raw Material Selection: Using certified ASTM A105 carbon steel to ensure durability and strength.
Precision Machining: Advanced CNC machining ensures perfect dimensions and surface finish.
Non-Destructive Testing (NDT): Each flange undergoes ultrasonic and radiographic inspections to detect internal defects.
Dimensional & Pressure Testing: Ensuring perfect alignment and leak-free performance under high pressure.
Corrosion Resistance Treatment: Surface finishing and coatings to prevent rust and damage.
With decades of experience in flange manufacturing and global supply, Haihao Group is a trusted partner for high-performance industrial flanges.
Looking for ASME B16.47 weld neck or blind flanges? Contact Haihao Group today for high-quality, precision-engineered pipeline solutions! Email:sales@haihaogroup.com