The 1 1/2″ pipe flange plays a pivotal role in industrial piping systems, serving as a critical component for connecting different pipes and components. This type of pipe flange boasts a range of outstanding features and advantages. In this blog, we will delve into the characteristics, benefits, and indispensable role it plays in industrial piping systems.

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Here are the detailed specifications for the 1 1/2″ Pipe Flange:

SpecificationDetailed Description
Size1 1/2 inches (Inches)
Pressure RatingANSI 150, ANSI 300, ANSI 600, ANSI 900, ANSI 1500, ANSI 2500
MaterialStainless Steel, Carbon Steel, Alloy Steel, or other specialized alloy materials (per customer requirements)
Flange TypeWeld Neck, Slip-On, Blind, Threaded, Forged, Lap Joint, Threaded Neck, Socket Weld, Flat Face, or other specialized types (per customer requirements)
Surface FinishSmooth, Raised Face, Concave Face, Oval, or other specialized surface finishes (per customer requirements)
Gasket CompatibilityDesigned for compatibility with various gasket materials, including rubber, metal, graphite, and others, to ensure effective sealing.
The detailed specifications for the 1 1/2″ Pipe Flange

These specifications provide a comprehensive overview of the 1 1/2″ Pipe Flange, including its size, pressure rating, material, flange type, surface finish, and gasket compatibility. If you require more information or a quotation, please feel free to contact our team, and we will provide personalized assistance and support.

Key Features of the 1 1/2″ Pipe Flange:

  • Size and Versatility: Designed for pipes with a 1 1/2-inch diameter, this flange provides a standardized solution for integrating various pipes and equipment into piping networks.
  • Material Diversity: The 1 1/2″ pipe flange can be crafted from a variety of materials, including stainless steel, carbon steel, and alloy steel, tailoring it to specific application needs such as corrosion resistance, temperature tolerance, and durability.
  • Flange Types: It is available in multiple types, including slip-on, weld neck, socket weld, and threaded, each designed for different connection methods, ensuring adaptability.
  • Pressure Handling: Carefully engineered to withstand diverse pressure levels, this flange is suitable for both low and high-pressure piping systems, ensuring the safety and functionality of pipelines.
  • Ease of Installation: Installing the 1 1/2″ pipe flange is straightforward, allowing for secure and leak-free connections during piping assembly, thereby reducing the risk of system failures and downtime.

Advantages of the 1 1/2″ Pipe Flange:

The 1 1/2″ pipe flange offers a multitude of advantages, including:

  • Leak Prevention: These flanges create robust seals with gaskets and bolts, effectively preventing fluid leakage, which can reduce costs and mitigate potential hazards.
  • Ease of Maintenance: Designed for easy disassembly and reassembly, these flanges simplify maintenance tasks, minimizing downtime and associated costs.
  • Versatility: With various flange types and material options, this flange finds applications across industries, including chemical processing, oil and gas, and water treatment, demonstrating its adaptability to diverse applications.

In the upcoming sections of this blog, we will delve deeper into these features and advantages, showcasing the critical role the 1 1/2″ pipe flange plays in ensuring efficient and secure industrial piping systems.

Product Specifications

  1. Size: The 1 1/2″ Pipe Flange is designed to accommodate pipes with a 1 1/2-inch diameter. This standardized size ensures compatibility with a wide range of piping systems.
  2. Material Options: These flanges are available in various materials to suit different environmental and operational needs. The commonly used materials include:
    • Stainless Steel: Ideal for applications requiring corrosion resistance, such as the food industry or chemical processing.
    • Carbon Steel: Known for its strength and durability, often used in high-pressure applications.
    • Alloy Steel: Combining strength and resistance to high temperatures, suitable for demanding environments like oil and gas.
  3. Pressure Ratings: The 1 1/2″ Pipe Flange is engineered to meet different pressure ratings, accommodating both low and high-pressure systems. Typical pressure classes include:
    • Class 150: Suitable for low-pressure applications.
    • Class 300: Used in moderate-pressure environments.
    • Class 600: Designed for high-pressure systems.
    • Higher classes are available for specialized needs.
  4. Industry Standards Compliance: These flanges are manufactured in accordance with industry standards to ensure quality, compatibility, and reliability. Common standards and specifications include:
    • ASME B16.5: The American Society of Mechanical Engineers standard for pipe flanges and flanged fittings.
    • ANSI: American National Standards Institute standards, often used in the United States.
    • DIN: German Industrial Standards, widely adopted in Europe.
    • JIS: Japanese Industrial Standards, prevalent in Japan and some Asian markets.
  5. Customization Options: To meet specific application requirements, manufacturers may offer customization options, including:
    • Gasket Material: Depending on the application, you can choose from various gasket materials, such as rubber, silicone, or PTFE, to ensure an optimal seal.
    • Coating or Lining: Specialized coatings or linings like epoxy or PTFE can enhance corrosion resistance or prevent material contamination.
    • Bolt and Nut Material: Customizing the material of bolts and nuts can improve overall flange performance and durability.
    • Special Dimensions: For unique applications, customized dimensions and designs may be available.

These detailed product specifications ensure that the 1 1/2″ Pipe Flange can be tailored to meet specific requirements across a wide range of industries and applications while adhering to relevant standards for quality and safety.

Key Features and Benefits

When it comes to Yanhao’s 1 1/2″ Pipe Flanges, there are several key features and associated benefits that make them a standout choice for industrial piping systems:

Key Features:

  1. Versatility: Yanhao’s 1 1/2″ Pipe Flanges are highly versatile, and designed to accommodate a wide range of pipe sizes and materials. This adaptability simplifies integration into diverse piping systems, making them a reliable choice across industries.
  2. Corrosion Resistance: These flanges are available in various materials, including stainless steel, which offers exceptional corrosion resistance. This feature is essential for applications in chemically aggressive environments, ensuring the longevity of the flanges and the integrity of the system.
  3. Material Customization: Yanhao provides material options such as stainless steel, carbon steel, and alloy steel. This flexibility allows customers to choose the material that best suits their specific operational requirements, whether it’s high strength, resistance to extreme temperatures, or compatibility with certain fluids.
  4. Ease of Installation: The design of Yanhao’s 1 1/2″ Pipe Flanges ensures easy installation. This simplifies the process of connecting pipes and components, reducing installation time and labor costs. A secure and leak-free connection can be achieved with straightforward procedures.


  1. Reliability: Yanhao’s 1 1/2″ Pipe Flanges are known for their reliability. Their robust design and quality materials ensure that they can withstand the demands of various industrial applications, reducing the risk of system failures and costly downtime.
  2. Longevity: Thanks to their corrosion-resistant properties and durable construction, these flanges have a long service life. This longevity translates into cost savings as they require less frequent replacement and maintenance.
  3. Reduced Downtime: Easy installation and maintenance-friendly design contribute to reduced downtime during system repairs or modifications. Quick and efficient installation means less disruption to your operations.
  4. Safety Assurance: The reliable sealing capabilities of Yanhao’s flanges prevent fluid leaks, contributing to a safer working environment and minimizing the risk of accidents or environmental hazards.

In summary, Yanhao’s 1 1/2″ Pipe Flanges offer a combination of versatility, corrosion resistance, and ease of installation. These key features, along with the associated benefits of reliability, longevity, and safety, make them a trusted choice for piping systems in various industries. Whether you need to connect pipes in a chemical processing plant, an oil and gas facility, or any other industrial setting, these flanges provide the dependable performance you require.


4. Applications:

Yanhao’s 1 1/2″ Pipe Flanges find wide-ranging applications across diverse industries due to their adaptability, reliability, and durability. Below, we explore some key sectors where these flanges play a pivotal role and provide specific use cases highlighting their performance enhancement:

1. Chemical Processing:

  • Use Case: In chemical processing plants, where the conveyance of corrosive substances is common, Yanhao’s 1 1/2″ Pipe Flanges, often made from stainless steel, prevent corrosion and ensure the integrity of pipelines. This is crucial for maintaining safety and product quality.

2. Oil and Gas:

  • Use Case: Within the oil and gas industry, where high-pressure environments are prevalent, Yanhao’s 1 1/2″ Pipe Flanges with robust construction and high-pressure ratings (e.g., Class 600) connect pipelines, valves, and pumps, ensuring safe and reliable operations.

3. Water Treatment:

  • Use Case: Water treatment facilities rely on these flanges to connect pipes transporting treated water. The leak-tight connections provided by Yanhao’s flanges are essential for preserving water quality and minimizing waste.

4. Food and Beverage:

  • Use Case: The food and beverage industry demands hygiene and cleanliness. Yanhao’s 1 1/2″ Pipe Flanges, often made of stainless steel, facilitate clean and sanitary connections, preventing contamination and ensuring product quality.

5. Pharmaceuticals:

  • Use Case: Pharmaceutical manufacturing requires precision and sterile conditions. Customized Yanhao’s flanges with specialized coatings or linings help maintain these conditions in pipelines, safeguarding product integrity.

6. Power Generation:

  • Use Case: Power plants, including nuclear and thermal facilities, rely on these flanges to connect various pipelines carrying steam, water, or fuel. The flanges’ material options and pressure ratings ensure safety and reliability in critical operations.

7. HVAC (Heating, Ventilation, and Air Conditioning):

  • Use Case: In HVAC systems, Yanhao’s 1 1/2″ Pipe Flanges connect pipes that distribute heating or cooling, enhancing energy efficiency and maintaining indoor comfort.

8. Construction and Building Services:

  • Use Case: These flanges are used in plumbing and heating systems within buildings to ensure reliable connections and prevent water leakage, contributing to the structural integrity of the construction.

9. Shipbuilding and Marine Industry:

  • Use Case: Yanhao’s flanges are essential in shipbuilding, connecting various pipelines, including those for water, fuel, and hydraulic systems, ensuring the vessel’s functionality and safety at sea.

10. Aerospace:

  • Use Case: In aircraft and aerospace applications, precision and reliability are paramount. Customized Yanhao’s flanges with special materials and coatings help maintain the integrity of fluid systems in critical aerospace components.

In each of these industries, Yanhao’s 1 1/2″ Pipe Flanges enhance the performance of piping systems by providing leak-tight connections, facilitating easy maintenance, and offering material customization to meet specific environmental and operational requirements. Their versatility and compatibility make them an integral component in ensuring the efficiency and safety of various industrial processes.

Design and Construction

Yanhao’s 1 1/2″ Pipe Flanges are engineered with a strong focus on structural integrity, durability, and customization options, making them stand out in the market. Here’s an in-depth look at their design and construction:

Design and Structural Integrity:

  1. Flange Types: Yanhao offers various types of 1 1/2″ Pipe Flanges, including slip-on, weld neck, socket weld, and threaded. Each type is designed with specific features to cater to different connection methods, ensuring flexibility in installation.
  2. Material Selection: The selection of materials is a critical aspect of the design. Yanhao’s flanges are available in stainless steel, carbon steel, and alloy steel, chosen based on the application’s requirements for factors like corrosion resistance, strength, and temperature tolerance.
  3. Pressure Ratings: These flanges are designed to meet a wide range of pressure ratings, from lower-pressure applications to high-pressure systems. This design flexibility ensures their suitability for various industrial environments.
  4. Structural Elements: Yanhao’s flanges consist of two main structural elements:
  • Flange Face: This flat surface is where the sealing gasket sits, ensuring a secure and leak-free connection when bolted to another flange or component.
  • Flange Rim: The raised edge around the flange face adds structural stability and strength, contributing to the overall robustness of the flange.
  1. Bolt Holes: Precisely positioned bolt holes are incorporated into the flange design. The number and size of these holes are determined by the flange’s size and class, allowing for secure attachment to other flanges or equipment.
  2. Gasket Seat: The flange design includes a gasket seat, where the sealing gasket is placed. This ensures a tight and reliable seal when the flange is bolted to another flange or component.

Durability and Customization:

  1. Material Customization: One of Yanhao’s key strengths is its extensive material options. Customers can choose from various materials to suit the specific needs of their applications, whether it’s for extreme corrosion resistance, high-temperature environments, or other specialized requirements.
  2. Coatings and Linings: Yanhao offers coatings and linings for these flanges, enhancing their resistance to corrosion and chemical reactions. These protective layers significantly extend the flange’s lifespan in demanding conditions.
  3. Precision Engineering: The manufacturing process of Yanhao’s flanges involves precision engineering techniques, ensuring that each flange conforms to industry standards and specifications. This dedication to quality control guarantees consistency and reliability.
  4. Innovative Sealing Solutions: Some of Yanhao’s flange designs incorporate innovative sealing solutions, such as self-energizing gaskets. These innovations further improve leak prevention and overall durability.
  5. Customization Options: Yanhao provides customization options for bolt materials, dimensions, and additional features like flange facings. This ensures that the flanges are tailored to meet the precise requirements of different industries and applications.

In summary, Yanhao’s 1 1/2″ Pipe Flanges are meticulously designed and constructed with an emphasis on structural integrity, durability, and customization. Their extensive material options, precise engineering, and potential for customization set them apart from competitors, making them a reliable choice for a wide range of piping system needs. Yanhao’s commitment to quality and innovation ensures that these flanges perform exceptionally in demanding industrial environments.

Quality Assurance

At Yanhao, we take quality assurance seriously and implement stringent measures throughout our manufacturing process to ensure the reliability and performance of our 1 1/2″ Pipe Flanges. Here’s an overview of our quality control practices:

Material Inspection:

  • We begin with a thorough inspection of all incoming raw materials, including stainless steel, carbon steel, and alloy steel. Each material batch is carefully examined to ensure it meets our strict quality standards.

Precision Machining:

  • Our flanges undergo precision machining processes, ensuring accurate dimensions and smooth surface finishes, vital for creating effective seals and preventing leakage.

Non-Destructive Testing (NDT):

  • We employ various non-destructive testing methods, such as ultrasonic testing, radiographic testing, and dye penetrant testing, to detect any internal defects or imperfections that could compromise the flange’s integrity.

Dimensional and Visual Inspections:

  • Our quality control personnel conduct detailed dimensional and visual inspections at multiple stages of production to identify and address any deviations from the specifications.

Certifications and Compliance:

  • Yanhao’s 1 1/2″ Pipe Flanges are manufactured in strict compliance with industry standards and specifications. We adhere to internationally recognized standards such as ASME B16.5, ANSI, and DIN to ensure consistency and reliability.


  • We maintain comprehensive records of materials, manufacturing processes, and quality control procedures for each flange produced. This allows us to provide full traceability, ensuring accountability and transparency.

Testing and Inspection Reports:

  • Each flange is accompanied by detailed testing and inspection reports, material certificates, and relevant documentation to demonstrate compliance with industry standards and specifications.

Continuous Improvement:

  • We actively seek opportunities for continuous improvement by analyzing any quality issues, customer feedback, or industry advancements. Our dedication to ongoing refinement ensures that our products consistently meet or exceed expectations.

Customer Satisfaction:

  • We prioritize customer satisfaction and are responsive to any concerns or inquiries related to our products. We value feedback from our customers and use it to further enhance our quality control processes.

By adhering to these stringent quality control measures, maintaining relevant certifications, and complying with industry standards, Yanhao ensures that our 1 1/2″ Pipe Flanges are of the highest quality and reliability. Customers can trust our products to perform consistently in a wide range of industrial applications while prioritizing safety and integrity.

Installation Guidelines for Yanhao’s 1 1/2″ Pipe Flanges

Proper installation of Yanhao’s 1 1/2″ Pipe Flanges is crucial to ensure leak-free connections and the optimal performance of your piping system. Here are step-by-step installation instructions along with some helpful tips and precautions:

Installation Steps:

  1. Prepare the Work Area:
    • Ensure the work area is clean, dry, and free from any debris or contaminants that could affect the sealing of the flanges.
  2. Inspect Flanges and Gaskets:
    • Check the 1 1/2″ Pipe Flanges for any visible damage or defects. Also, inspect the gaskets for signs of wear or damage. Replace any compromised components.
  3. Bolt and Nut Inspection:
    • Inspect the bolts and nuts for damage or corrosion. Make sure they are in good condition and compatible with the flange material.
  4. Flange Alignment:
    • Properly align the flanges with the pipe ends to ensure they are concentric. Misalignment can result in uneven pressure distribution and leaks.
  5. Gasket Placement:
    • Place the gasket between the flange faces. Ensure that the gasket is centered and fits snugly within the flange’s gasket seat.
  6. Bolt Insertion:
    • Insert the bolts through the bolt holes of one flange and thread them loosely into the bolt holes of the opposite flange. Do not tighten the bolts fully at this stage.
  7. Bolt Tightening Sequence:
    • Begin tightening the bolts in a crisscross pattern, starting with one bolt and then moving diagonally to the bolt on the opposite side. Gradually tighten each bolt in small increments to ensure even pressure distribution.
  8. Torque Specification:
    • Refer to the manufacturer’s torque specifications for the specific flange and gasket materials being used. Tighten the bolts to the recommended torque values to achieve the proper seal.
  9. Inspect the Seal:
    • After tightening the bolts, visually inspect the flange seal to ensure that it is uniform and the gasket is properly compressed. There should be no visible gaps or irregularities.
  10. Leak Test:
    • Perform a leak test, typically by pressurizing the system with air or water to the specified operating pressure. Check for any leaks around the flange connections. If leaks are detected, revisit the tightening process.

Helpful Tips and Precautions:

  • Use Proper Tools: Use calibrated torque wrenches to achieve the recommended torque values accurately. Over-tightening can damage the flanges or gaskets, while under-tightening can result in leaks.
  • Gasket Selection: Ensure that the gasket material is compatible with the fluids being transported. Different gasket materials are suitable for various applications, including high-temperature or corrosive environments.
  • Avoid Overtightening: Be cautious not to overtighten the bolts, as this can distort the flange faces or damage the gasket, leading to leaks.
  • Follow Industry Standards: Adhere to industry standards and guidelines for flange installation, such as those provided by ASME or ANSI.
  • Regular Inspections: Periodically inspect the flange connections for signs of wear, corrosion, or damage. Replace any components that show signs of degradation.

Proper installation of Yanhao’s 1 1/2″ Pipe Flanges, combined with regular maintenance and adherence to safety practices, will ensure the long-term reliability and performance of your piping system.

Additional Resources

At Yanhao, we are committed to providing comprehensive support and resources to assist you in using our 1 1/2″ Pipe Flanges effectively. Here are some additional resources that can aid you in your endeavors:

Technical Documents:

  • Access detailed technical documents, including product specifications, material data sheets, and installation guidelines, on our official website. These documents offer in-depth information about our flanges and their applications.

CAD Drawings:

  • CAD drawings of our 1 1/2″ Pipe Flanges are available for download on our website. These drawings can be invaluable for engineers and designers working on piping system projects.

Video Tutorials:

  • Explore our collection of video tutorials that provide step-by-step guidance on flange installation, maintenance, and troubleshooting. These videos offer a visual and practical understanding of working with our flanges.

Catalogs and Brochures:

  • Our product catalogs and brochures offer a comprehensive overview of our entire flange product range, including specifications, materials, and customization options. You can find these resources on our website or request printed copies.

Frequently Asked Questions (FAQs):

  • Visit our website’s FAQ section to find answers to common questions about our flanges, applications, and maintenance. It’s a convenient resource for quick information.

Contact Information:

  • For inquiries, technical assistance, or customer support, our dedicated team is ready to assist you. You can reach us through the following contact channels:
  • Phone: +86 13313073735 15303178205 (same as WeChat)
  • Email:
  • Physical Address: Xiaozhuangzi Road Section, Xinda Highway, Mengcun Hui Autonomous County, Cangzhou City, Hebei Province

Our customer support team is available to answer your questions, provide guidance on product selection, and assist with any technical issues or customization requests you may have.

At Yanhao, we are committed to ensuring that you have all the resources and support you need to make the most of our 1 1/2″ Pipe Flanges in your industrial applications. We value your partnership and are here to assist you every step of the way.

Lewis Liu

Hello, I am Lewis Liu, a professional sales engineer with over ten years of experience in the flange fittings industry. I am highly knowledgeable in flange selection, installation, and maintenance. I am passionate about providing customers with the best solutions to ensure their pipeline systems run smoothly, safely, and reliably.

If you have any questions or concerns regarding flange fittings for your pipelines, whether it’s about selection, material choice, specification requirements, or any other aspect, please feel free to contact me at any time. I am committed to offering professional advice and assistance to help you make informed decisions and meet your needs.

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