Welcome to YANHAO, your trusted partner for top-tier industrial solutions. Our expertly crafted 38″ pipe flanges are designed to meet the highest industry standards. Explore our comprehensive range of 38″ pipe flanges, each manufactured with precision and excellence.

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38″ Pipe Flanges: Overview


38″ pipe flanges, often referred to as 38-inch flanges, are critical components in industrial piping systems, known for their substantial size and robust construction. Below, we provide a comprehensive overview of their specifications:

1. Size and Dimensions:

  • Diameter: 38 inches (965.2 mm)
  • Bolt Circle Diameter: Varies depending on the flange type (e.g., ANSI B16.47 Series A or Series B, ASME B16.5)

2. Flange Facing:

  • Common facings include raised face (RF), flat face (FF), and ring-type joint (RTJ).

3. Pressure Class:

  • 38″ pipe flanges are available in a range of pressure classes to accommodate various pressure and temperature requirements. Common classes include 150, 300, 600, 900, 1500, and 2500.


The choice of material for 38″ pipe flanges is crucial to ensure longevity, corrosion resistance, and safety in different industrial applications. Common materials include:

1. Carbon Steel:

  • ASTM A105
  • Suitable for standard industrial applications with moderate corrosion risks.

2. Stainless Steel:

  • Grades such as ASTM A182 F304, F316
  • Ideal for applications where corrosion resistance is paramount, including chemical processing and offshore drilling.

3. Alloy Steel:

  • ASTM A182 F5, F9, F11, F22
  • Used in high-temperature and high-pressure applications, such as power generation.

4. Exotic Alloys:

  • Inconel, Hastelloy, Monel, and others.
  • Reserved for extreme environments where resistance to highly corrosive substances is required.


38″ pipe flanges are classified based on their design and connection method. Some common types include:

1. Weld Neck Flanges:

  • Feature a tapered hub for welding to the pipe, providing excellent structural support and sealing capability.

2. Slip-On Flanges:

  • Slide over the pipe and are typically secured with fillet welding. They are easier to install but may not be suitable for high-pressure applications.

3. Socket Weld Flanges:

  • Designed to be welded to the pipe’s socket end, ensuring a strong connection. Often used in smaller pipe sizes and lower-pressure systems.

4. Blind Flanges:

  • Used to close off the end of a pipe or a valve, preventing flow. Commonly used for inspection purposes.

5. Lap Joint Flanges:

  • Feature a flat face and a loose, non-integral flange ring. They are used in systems where frequent dismantling is required.

6. Threaded Flanges:

  • Have threads on the inner bore for connecting to threaded pipes. Suitable for low-pressure and smaller-diameter applications.


38″ pipe flanges must adhere to industry standards to ensure compatibility and safety. Common standards include:

1. ANSI/ASME B16.5:

  • Specifies dimensions, tolerances, and pressure-temperature ratings for pipe flanges.

2. ANSI/ASME B16.47:

  • Divided into Series A (MSS SP44) and Series B (API 605), providing guidelines for large-diameter flanges.

3. API 6A:

  • Specifically for wellhead and Christmas tree equipment, often used in the oil and gas industry.

4. DIN Standards:

  • Popular in European markets, these standards are often used for flanges in various industries.

By understanding these detailed specifications, materials, classifications, and standards, you can make informed decisions when selecting 38″ pipe flanges for your specific industrial applications, ensuring safety, reliability, and performance.

Applications of 38″ Pipe Flanges

38″ pipe flanges find a wide range of applications across various industries due to their versatility, strength, and reliability. Below, we provide detailed insights into the key sectors where these flanges are commonly used:

1. Oil and Gas Industry:

  • Offshore Platforms: 38″ pipe flanges play a crucial role in connecting pipelines, risers, and production equipment on offshore drilling platforms. Their resistance to harsh marine environments and high-pressure applications is essential.
  • Onshore Processing: In refineries and petrochemical plants, these flanges are used to connect pipelines, valves, and equipment. They ensure the safe transport of crude oil and refined products.

2. Petrochemical Industry:

  • Chemical Processing: Petrochemical facilities rely on 38″ pipe flanges to handle corrosive chemicals and high-temperature processes. These flanges are essential for connecting reactors, heat exchangers, and distillation columns.
  • Industrial Furnaces: In the production of chemicals and petrochemicals, high-temperature industrial furnaces require robust flange connections to maintain operational integrity.

3. Power Generation:

  • Fossil Fuel Power Plants: In coal, natural gas, or oil-fired power plants, 38″ pipe flanges are used in critical areas, including steam lines, feedwater systems, and exhaust gas handling, where high pressures and temperatures are common.
  • Nuclear Power Plants: For the containment of radioactive materials, nuclear power plants rely on these flanges in cooling systems, reactor coolant loops, and steam generators.

4. Industrial Pipelines:

  • Water and Wastewater Treatment: Municipal water treatment facilities use 38″ pipe flanges to connect large-diameter pipes, valves, and pumps, ensuring the efficient distribution and treatment of water and wastewater.
  • Mining and Minerals Processing: In mining operations, these flanges are employed to transport ores, slurries, and tailings, handling the abrasive and corrosive materials often encountered in mining processes.

In all these applications, 38″ pipe flanges are critical components that ensure the integrity and safety of industrial processes. Their ability to withstand high pressures, extreme temperatures, and corrosive environments makes them indispensable in numerous sectors. When selecting 38″ pipe flanges for a specific application, it is essential to consider factors such as material compatibility, pressure ratings, and industry standards to ensure optimal performance and longevity.

Advantages of YANHAO 38″ Pipe Flanges

YANHAO is dedicated to delivering 38″ pipe flanges that meet the highest industry standards. Our commitment to quality and reliability sets us apart, offering numerous advantages to our customers:

Quality Control: Ensuring Excellence at Every Stage

At YANHAO, we understand the critical role that quality plays in the performance and safety of 38″ pipe flanges. Our comprehensive quality control processes encompass every aspect of manufacturing, from material selection to final inspection:

1. Superior Quality Assurance:

  • Rigorous material testing ensures that only the highest-grade materials are used in our flanges.
  • Advanced manufacturing techniques are employed to maintain precision and consistency in production.

2. Exceptional Durability:

  • YANHAO 38″ pipe flanges are engineered for long-term durability, capable of withstanding high pressures, extreme temperatures, and corrosive environments.
  • Specialized heat treatments and surface coatings enhance the flanges’ resistance to wear and corrosion.

3. Rigorous Testing Procedures:

  • Non-destructive testing (NDT), including ultrasonic and radiographic examinations, is conducted to detect any material defects or flaws.
  • Hydraulic and pneumatic pressure testing is performed to verify the flanges’ ability to maintain a secure seal under pressure.

4. Compliance with International Standards:

  • YANHAO adheres to industry-recognized standards, such as ANSI/ASME, API, and DIN, ensuring that our 38″ pipe flanges consistently meet global quality benchmarks.
  • Our commitment to continuous improvement means that we stay updated with the latest industry standards and best practices.

5. Traceability and Documentation:

  • Every step of the manufacturing process is meticulously documented, ensuring full traceability of materials and processes.
  • Inspection reports, material certificates, and compliance documentation are provided with each product, enhancing transparency and confidence in our quality.

By prioritizing quality control in every aspect of our 38″ pipe flange production, YANHAO guarantees that our products not only meet but exceed customer expectations. Our commitment to excellence is your assurance of reliable, high-performance flanges for even the most demanding industrial applications. Trust YANHAO for quality that stands the test of time.

Ordering Process for YANHAO 38″ Pipe Flanges

At YANHAO, we strive to make the ordering process for our 38″ pipe flanges as seamless and customer-friendly as possible. Here’s a detailed overview of how to place an order, our lead times, delivery options, and the support and assistance available to you:

1. How to Place an Order:

Placing an order with YANHAO is a straightforward process designed to meet your specific needs:

  • Contact Us: Reach out to our dedicated sales team through our website, email, or phone. Our knowledgeable representatives are ready to assist you.
  • Product Consultation: Discuss your requirements with our experts. They will help you select the appropriate 38″ pipe flange type, material, and specifications for your application.
  • Request a Quote: Provide details such as quantity, specifications, and any customization requirements. We will promptly generate a detailed quotation for your approval.
  • Order Confirmation: Once you’re satisfied with the quote, confirm your order with our team. We’ll guide you through the necessary paperwork and payment process.
  • Production Commences: Once your order is confirmed, our manufacturing team will begin the production process, ensuring precision and quality at every step.

2. Lead Times and Delivery:

  • Lead Times: The lead time for 38″ pipe flanges may vary depending on the complexity of your order, customization requirements, and our current production schedule. Our team will provide you with an estimated lead time during the order confirmation process.
  • Expedited Options: If you have urgent requirements, inquire about expedited manufacturing and delivery options. We’ll do our best to accommodate your timeline.
  • Delivery: We offer flexible delivery options, including standard shipping, express shipping, and international shipping. Our logistics team ensures that your order is carefully packaged and delivered to your specified location safely and on time.

3. Customer Support and Assistance:

  • Dedicated Account Manager: Each customer is assigned a dedicated account manager who serves as your primary point of contact throughout the ordering process. They are available to address any questions or concerns you may have.
  • Technical Support: Our technical experts are on hand to provide guidance on product selection, compatibility, and any technical queries you may encounter.
  • Order Tracking: You can track the progress of your order from production through to delivery. Regular updates will be provided to keep you informed.
  • After-Sales Support: Our commitment to your satisfaction doesn’t end with delivery. If you encounter any issues or have post-purchase questions, our customer support team is here to assist.

At YANHAO, we take pride in our commitment to exceptional customer service and support. We are dedicated to ensuring that your experience in ordering 38″ pipe flanges is efficient, transparent, and tailored to your unique requirements. Contact us today to begin the process and benefit from our expertise and quality products.

Maintenance and Care of YANHAO 38″ Pipe Flanges

Proper maintenance and care of 38″ pipe flanges are essential to ensure their long-term performance and reliability in industrial applications. Below, we provide detailed guidance on handling, inspection, maintenance, and troubleshooting common issues:

1. Proper Handling Guidelines:

  • Handle with Care: Always handle 38″ pipe flanges with care to prevent damage during transportation and installation. Use appropriate lifting equipment and follow safety protocols.
  • Protection from Contaminants: Keep flanges covered or protected during storage to prevent contamination by dirt, moisture, or foreign particles.
  • Avoid Impact: Protect flange faces from impact or dents, as these can compromise sealing integrity.
  • Storage Conditions: Store flanges in a dry, clean, and well-ventilated area, and ensure they are stored in an upright position to prevent warping.

2. Inspection and Maintenance Tips:

  • Regular Inspection: Periodically inspect 38″ pipe flanges for signs of wear, corrosion, or damage. Early detection can prevent costly failures.
  • Bolt Tightness: Check bolt torque regularly to ensure proper gasket compression. Follow the manufacturer’s recommendations for tightening procedures.
  • Gasket Replacement: If leaks occur, replace gaskets promptly, and ensure they are correctly aligned and properly seated.
  • Corrosion Protection: Implement corrosion prevention measures, such as coatings or cathodic protection, especially in aggressive environments.
  • Surface Cleaning: Keep flange faces clean and free of debris or residue. Gasket sealing surfaces must be smooth and free from imperfections.

3. Troubleshooting Common Issues:

  • Leakage: If you experience leaks, inspect gaskets for damage or improper installation. Ensure proper bolt torque and alignment of flange faces.
  • Corrosion: Address corrosion promptly by applying suitable protective coatings or replacing corroded components.
  • Bolt Failures: If bolts fail, investigate the cause, which may include incorrect tightening procedures, material issues, or excessive stress. Replace bolts as needed.
  • Flange Face Damage: Repair flange face damage by re-machining or, if necessary, replacing the flange. Properly align the flanges during reinstallation.
  • Flange Warping: If flanges become warped, assess the cause, which could be thermal stress or over-tightening. Consider corrective measures, including stress relieving or replacing the flange.

Proactive maintenance and timely troubleshooting can extend the lifespan of your 38″ pipe flanges and prevent costly downtime. YANHAO is available to provide guidance and support for maintenance procedures and addressing any issues that may arise. Our commitment to customer satisfaction extends to after-sales support, ensuring that your flanges continue to perform at their best.


Here are the ten common questions and answers about 38″ Pipe Flanges summarized in English:

1. What are 38″ Pipe Flanges?

Answer: 38″ Pipe Flanges are pipe connection components used to connect pipes, valves, and equipment. They are typically round with holes for bolts to secure adjacent pipes or components. These flanges are commonly used in high-pressure and high-temperature applications, ensuring system sealing and safety.

2. What are the different types of 38″ Pipe Flanges?

Answer: There are various types of 38″ Pipe Flanges, including weld neck, slip-on, blind, threaded, socket weld, and lap joint flanges. Each type has unique design features and applications.

3. How do I choose the right 38″ Pipe Flanges for my needs?

Answer: Selecting the right 38″ Pipe Flanges involves considering factors like the application environment, pressure and temperature requirements, pipe material, and flange type. Consulting with professional engineers or manufacturers is recommended for precise guidance.

4. What are the common materials for 38″ Pipe Flanges?

Answer: Common materials for 38″ Pipe Flanges include carbon steel, stainless steel, alloy steel, and special alloys like Inconel and Hastelloy. Material choice depends on factors like corrosion resistance and high-temperature performance.

5. How should I handle the installation and maintenance of 38″ Pipe Flanges?

Answer: Proper installation involves correct bolt torque and flange face alignment. Regular inspections for wear, corrosion, or damage are crucial, as is the timely replacement of gaskets. Maintenance also includes corrosion prevention, keeping flange faces clean, and avoiding impact.

6. In which industries are 38″ Pipe Flanges commonly used?

Answer: 38″ Pipe Flanges are used in various industries, including petroleum and natural gas, petrochemicals, power generation, water treatment, mining, and manufacturing. They serve to connect pipes and equipment, ensuring the safe transport of fluids or gases.

7. What is the maximum pressure 38″ Pipe Flanges can handle?

Answer: The maximum pressure 38″ Pipe Flanges can handle depends on their material, design, thickness, and application environment. Different flange types and standards specify different pressure ratings, typically ranging from 150 to 2500 pounds.

8. How can I ensure the sealing performance of 38″ Pipe Flanges?

Answer: Ensuring sealing performance requires the correct choice of gaskets, proper bolt torque, and flange face alignment according to the manufacturer’s recommendations. Regular inspection and maintenance are key to maintaining sealing performance.

9. Can 38″ Pipe Flanges be used in high-temperature applications?

Answer: Yes, 38″ Pipe Flanges can be used in high-temperature applications, provided that appropriate materials like alloy steel or stainless steel are chosen, and the flanges and gaskets can withstand high-temperature environments. Proper bolt torque is also critical for sealing performance.

10. How should I address corrosion issues with 38″ Pipe Flanges?

Answer: Addressing corrosion involves measures such as using corrosion-resistant materials, regular inspection and repair of corroded areas, applying corrosion-resistant coatings, or utilizing cathodic protection. The specific corrosion prevention strategy depends on the application environment and material selection.

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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