Understanding 4″ Pipe Flanges

Here are the detailed specifications for the 4″ Pipe Flange:

SpecificationDetailed Description
Size4 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 4″ Pipe Flange

These specifications provide a comprehensive overview of the 4″ 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.

A. What Are 4″ Pipe Flanges?

  1. Introduction to 4″ Pipe Flanges: 4″ pipe flanges are specialized components used in piping systems, designed specifically for pipes with a nominal diameter of 4 inches (101.6 millimeters). These flanges are crucial in connecting, securing, and sealing pipes, valves, and other equipment within industrial and commercial applications.
  2. Importance of 4″ Pipe Flanges:
    • Secure Connections: 4″ pipe flanges play a critical role in creating secure and leak-proof connections between 4-inch pipes, ensuring the integrity of fluid or gas transport.
    • Easy Maintenance: Their design allows for easy access to the connected components, simplifying maintenance, inspection, and repairs.
    • Versatility: 4″ pipe flanges provide versatility by allowing various configurations and adjustments within a piping system.
    • Pressure Control: They are essential for containing and controlling pressure within the system, making them indispensable in high-pressure applications across industries.
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B. Types of 4″ Pipe Flanges

  1. Weld Neck Flanges (4″ WN):
    • Design: 4″ weld neck flanges have a long, tapered neck that seamlessly connects with the 4-inch pipe. They feature a raised face for enhanced sealing.
    • Applications: Ideal for high-pressure and high-temperature applications due to their structural support and stress distribution capabilities.
  2. Slip-On Flanges (4″ SO):
    • Design: 4″ slip-on flanges slide over the 4-inch pipe, with a bore slightly larger than the pipe’s outer diameter. Typically, they are welded only on the outside and come with a raised face.
    • Applications: Commonly used in low-pressure and non-critical applications where quick and cost-effective installation is required.
  3. Blind Flanges (4″ BL):
    • Design: 4″ blind flanges have no bore and are used to seal the end of a 4-inch piping system. They feature a flat and solid design with no openings.
    • Applications: Primarily employed to cap off or close the end of a 4-inch pipe or vessel. They are often used during pressure testing or system isolation.
  4. Threaded Flanges (4″ TH):
    • Design: 4″ threaded flanges have internal threads, allowing them to be screwed onto 4-inch pipes or fittings.
    • Applications: Suitable for low-pressure and non-critical applications where a threaded connection is preferred.
  5. Socket Weld Flanges (4″ SW):
    • Design: 4″ socket weld flanges feature a socket-like design that permits the insertion of the 4-inch pipe, followed by fillet welding on the outside.
    • Applications: Commonly used in small-bore, high-pressure applications, such as those found in the petrochemical industry.
  6. Lap Joint Flanges (4″ LJ):
    • Design: 4″ lap joint flanges consist of two parts: a flat, stub-end, and a backing flange. They allow free rotation around the axis of the stub-end.
    • Applications: Typically utilized in applications requiring frequent disassembly and reassembly, such as piping systems with regular maintenance needs.

C. Materials and Specifications of 4″ Pipe Flanges

  1. Materials: 4″ pipe flanges are available in various materials to suit diverse applications, including carbon steel, stainless steel, alloy steel, and non-ferrous materials like brass and copper.
  2. Sizing Options: The sizing of 4″ pipe flanges is based on the nominal diameter of the pipe, which is 4 inches (101.6 millimeters). It’s essential to choose the correct size to ensure a proper fit and sealing in your piping system.
  3. Pressure Ratings: Flanges are rated for different pressure classes (e.g., 150#, 300#, 600#, etc.), indicating their ability to withstand specific pressure levels, typically measured in pounds per square inch (psi).
  4. Facing Types: Flanges may feature different facing types, such as raised face (RF), flat face (FF), or ring-type joint (RTJ), tailored to accommodate various sealing methods and specific application requirements.

Understanding the different types of 4″ pipe flanges, their materials, and specifications is essential for selecting the right flanges to meet the specific needs of your 4-inch pipe systems. Whether it’s for high-pressure applications, quick installation, or routine maintenance, choosing the appropriate 4″ pipe flange type and material is crucial for ensuring the efficiency and reliability of your piping systems.

YANHAO’s 4″ Pipe Flanges

A. Product Range

Showcase of Diverse 4″ Pipe Flanges:

  • At YANHAO, we take pride in offering a comprehensive and diverse range of 4″ pipe flanges to cater to various industrial needs. Our product range encompasses a wide selection of types, materials, and specifications, ensuring that you find the perfect flange for your specific application.
  • Our inventory includes, but is not limited to:
    • 4″ Weld Neck Flanges (4″ WN): Ideal for high-pressure and high-temperature applications.
    • 4″ Slip-On Flanges (4″ SO): Quick and cost-effective solutions for low-pressure applications.
    • 4″ Blind Flanges (4″ BL): Essential for sealing the ends of 4″ pipes and vessels.
    • 4″ Threaded Flanges (4″ TH): Designed for threaded connections in non-critical applications.
    • 4″ Socket Weld Flanges (4″ SW): Perfect for small-bore, high-pressure applications.
    • 4″ Lap Joint Flanges (4″ LJ): Ideal for applications requiring frequent disassembly.
  • Our commitment to offering a wide range ensures that you can find precisely what you need to meet the demands of your unique projects.

B. Quality Assurance

Detailed Insights into Our Manufacturing Process:

  • YANHAO’s commitment to quality begins with our rigorous manufacturing process. We believe in transparency, and we’re proud to provide detailed insights into how our 4″ pipe flanges are crafted:
    • Material Selection: We carefully select premium materials, ensuring they meet the highest industry standards for durability and performance.
    • Precision Manufacturing: Our state-of-the-art manufacturing facilities are equipped with cutting-edge technology and staffed by skilled professionals. Every step of production is closely monitored to guarantee precise dimensions and consistent quality.
    • Quality Control: Stringent quality control procedures are in place at every stage of manufacturing. This includes thorough inspections, testing, and verification processes to ensure that each 4″ pipe flange adheres to our strict quality standards.
    • Certifications: Our commitment to quality is reinforced by relevant certifications, including ISO certifications, ensuring that our products meet international quality benchmarks.

C. Advantages

Benefits of Choosing YANHAO’s 4″ Pipe Flanges:

  • When you select YANHAO’s 4″ pipe flanges, you unlock a multitude of advantages that set us apart:
    • Exceptional Quality: Our flanges are known for their unwavering quality, ensuring reliability and longevity in your systems.
    • Expertise and Innovation: Backed by years of industry expertise, we continually innovate to provide cutting-edge solutions that address evolving industrial challenges.
    • Cost-Effective Solutions: YANHAO offers cost-effective pricing without compromising on quality, helping you optimize your project budgets.
    • Customization: We understand that unique projects demand unique solutions. We offer customization options to tailor our flanges to your precise specifications.
    • Technical Support: Our dedicated technical team is ready to assist you with product selection, technical inquiries, and any support you may need, ensuring a seamless experience.

Choosing YANHAO’s 4″ pipe flanges means choosing reliability, quality, and a commitment to excellence. Our product range, manufacturing process, and numerous advantages make us your trusted partner for all your 4″ pipe flange requirements.


A. Industrial Use

  • 4″ pipe flanges are essential components in a wide array of industries, where secure and reliable connections play a critical role in operations. Some key industries where these flanges are indispensable include:
  • Oil and Gas: In the oil and gas sector, 4″ pipe flanges are used extensively for connecting pipelines, ensuring the safe and efficient transport of crude oil, natural gas, and petroleum products. They are vital for drilling, refining, and distribution processes.
  • Petrochemical: The petrochemical industry relies on 4″ pipe flanges to handle corrosive chemicals and high-pressure systems. These flanges are used in the construction of reactors, heat exchangers, and various chemical processing equipment.
  • Water Treatment: In water treatment plants, 4″ pipe flanges are used for connecting pipes that transport water, chemicals, and wastewater. Their durability and leak-free design are critical for maintaining the integrity of water treatment systems.
  • Power Generation: Power plants, including nuclear, thermal, and hydroelectric facilities, utilize 4″ pipe flanges for connecting steam and coolant lines, ensuring efficient energy generation and distribution.
  • Construction: In the construction industry, 4″ pipe flanges are essential for plumbing, HVAC systems, and structural support in commercial and residential buildings.
  • Marine and Shipbuilding: Shipbuilding and maritime industries use 4″ pipe flanges for various applications, including seawater systems, fuel transfer, and hydraulic systems on vessels.
  • Mining: Mining operations rely on 4″ pipe flanges to transport minerals, slurry, and water. They are crucial for maintaining continuous mining processes.
  • Food and Beverage: The food and beverage industry utilizes 4″ pipe flanges for sanitary connections in food processing, beverage production, and pharmaceutical applications.
  • Chemical Processing: Chemical plants depend on 4″ pipe flanges to connect pipes that transport chemicals, ensuring the safety and efficiency of chemical manufacturing processes.
  • Agriculture: In agriculture, these flanges are used for irrigation systems, transporting water, fertilizers, and pesticides to maximize crop yields.

B. Case Studies

  • Case Study 1: Oil and Gas Pipeline Construction
    • YANHAO’s 4″ pipe flanges played a crucial role in a major oil and gas pipeline project. The project involved the construction of a high-pressure pipeline for transporting natural gas across challenging terrains. Our weld neck flanges ensured secure connections, withstanding extreme pressures and environmental conditions. This project’s success highlighted the reliability and durability of our products in the demanding oil and gas industry.
  • Case Study 2: Water Treatment Plant Upgrade
    • A water treatment plant in a metropolitan area underwent a significant upgrade to meet growing demands. YANHAO’s 4″ pipe flanges were used to replace aging components in the water distribution system. The slip-on flanges provided a cost-effective solution for quick and efficient installation, resulting in improved water quality and uninterrupted service for the community.
  • Case Study 3: Petrochemical Reactor Installation
    • A petrochemical facility required the installation of a new reactor for a complex chemical process. YANHAO’s socket weld flanges were selected for their ability to withstand high pressures and temperatures. The successful installation and operation of the reactor showcased the reliability and performance of our flanges in critical industrial applications.

These real-world case studies illustrate how YANHAO’s 4″ pipe flanges have been integral to the success of diverse projects across various industries. Their versatility, quality, and durability make them a trusted choice for professionals seeking reliable solutions in critical applications.

Expertise and Technical Support

A. Technical Specifications

  • YANHAO is committed to providing comprehensive technical specifications to assist our customers in making informed decisions. Our 4″ pipe flanges are accompanied by detailed technical data that includes:
    • Material Specifications: We provide precise details about the materials used in our flanges, including composition, properties, and compliance with industry standards.
    • Dimensional Data: You will find accurate measurements, tolerances, and dimensions to ensure compatibility with your existing piping systems.
    • Pressure Ratings: Our technical specifications specify the pressure ratings of each flange type and size, helping you select the appropriate flange for your system’s pressure requirements.
    • Facing Types: Information about facing types (raised face, flat face, RTJ) is included, allowing you to choose the right facing for your sealing method.
    • Certifications: Our flanges come with certifications and quality assurance documentation, demonstrating compliance with international standards such as ISO, ANSI, and ASTM.

B. Custom Solutions

  • YANHAO understands that each project is unique, often requiring tailored solutions to meet specific requirements. We take pride in our ability to provide custom solutions for your 4″ pipe flange needs:
    • Material Customization: If your project demands specific materials or coatings, we can customize the flanges accordingly to enhance corrosion resistance, durability, or other performance factors.
    • Dimensional Adjustments: Whether you require non-standard dimensions, special bore sizes, or unique flange configurations, our experts can work with you to ensure a perfect fit.
    • Specialized Applications: If your industry has unique challenges, we can collaborate to develop flanges that address those challenges, such as extreme temperatures, corrosive environments, or high-pressure conditions.
    • Prototype Development: We offer prototype development services for one-of-a-kind projects, allowing you to test and refine your designs with our custom flanges.

C. Expert Team

  • At YANHAO, we recognize that technical expertise is crucial in delivering high-quality solutions. Our dedicated technical team consists of experienced professionals who bring a wealth of knowledge to the table:
    • Industry Experience: Our experts have extensive experience in various industries, including oil and gas, petrochemicals, water treatment, and more, making them well-versed in industry-specific requirements.
    • Product Knowledge: Our team possesses in-depth knowledge of our 4″ pipe flanges, ensuring that they can provide accurate guidance and technical insights.
    • Problem-Solving: We pride ourselves on our problem-solving abilities. When faced with complex challenges, our technical team collaborates to find innovative solutions that meet your needs.
    • Responsive Support: Whether you have technical inquiries, require customization, or need assistance with product selection, our team is readily available to provide expert support throughout your project.

YANHAO’s technical expertise, commitment to customization, and experienced team ensure that you have the right support and solutions for your 4″ pipe flange requirements. We are dedicated to assisting you at every stage of your project, from initial planning to successful implementation.

Ordering Process

A. How to Order

Step-by-Step Guide for Ordering 4″ Pipe Flanges: Ordering your 4″ pipe flanges from YANHAO is a straightforward process designed to ensure a seamless and efficient experience. Here’s a step-by-step guide:

  • Contact Us: Start by reaching out to our dedicated customer support team through our website, email, or phone. Our knowledgeable representatives are ready to assist you with any inquiries and guide you through the ordering process.
  • Product Selection: Work closely with our experts to select the 4″ pipe flange type, material, and specifications that best match your project requirements. We’ll provide detailed technical information to help you make informed choices.
  • Customization (if needed): If your project requires custom solutions, we’ll collaborate with you to determine the exact specifications, materials, or coatings necessary. Our team will provide recommendations based on your unique needs.
  • Quotation: Once your product choices are finalized, we’ll provide you with a transparent and competitive quotation. Our pricing is designed to offer excellent value while maintaining the highest quality standards.
  • Order Confirmation: After reviewing the quotation and ensuring it meets your requirements, confirm your order with us. We’ll provide you with an order confirmation for your records.
  • Payment: YANHAO offers flexible payment options, including credit card payments, bank transfers, and other convenient methods. Payment details will be provided in your order confirmation.
  • Production and Quality Control: Our manufacturing team will begin producing your 4″ pipe flanges, adhering to the specifications and customization requirements. Rigorous quality control processes ensure that every flange meets our high standards.
  • Shipping and Delivery: Your order will be prepared for shipment, with suitable packaging to protect the flanges during transit.
  • Tracking and Updates: We’ll provide you with shipment tracking information so you can monitor the progress of your order. Our team will also keep you updated on any important developments.
  • Receipt and Inspection: Upon receiving your order, carefully inspect the 4″ pipe flanges to ensure they match your specifications and meet your expectations. Our commitment to quality ensures that you receive reliable products.
  • Customer Support: Throughout the entire process, our customer support team is available to address any questions or concerns, providing expert assistance to ensure your satisfaction.

B. Pricing

Transparent Pricing and Payment Options:

  • YANHAO believes in transparent and competitive pricing. Our quotations are tailored to your specific order, reflecting the type, quantity, customization, and other relevant factors.
  • We offer various payment options, including credit card payments, bank transfers, and other secure methods. Our payment terms are flexible and designed to accommodate your needs.
  • Rest assured that our pricing aligns with the exceptional quality and value that YANHAO’s 4″ pipe flanges represent. You can trust that you are getting the best products at competitive prices.

C. Shipping and Delivery

Information on Delivery Options and Timelines:

  • YANHAO provides flexible shipping options to accommodate your project’s requirements. Our shipping services are designed to ensure the safe and timely delivery of your 4″ pipe flanges.
  • Delivery Timelines: Shipping times may vary based on your location, product availability, and any special customization requirements. Our team will provide you with estimated delivery timelines when you place your order.
  • Delivery Methods: We offer various delivery methods, including standard ground shipping, expedited shipping, and international shipping. The choice of delivery method depends on your project’s urgency and location.
  • Tracking: We provide shipment tracking information so you can monitor the progress of your order in real-time. This helps you stay informed about the status of your delivery.
  • International Shipping: For international orders, we handle all necessary documentation, customs clearance, and logistics to ensure a smooth and hassle-free delivery process.
  • Customer Support: Our customer support team is available to assist with any shipping-related inquiries, address concerns, and provide updates on your order’s delivery status. YANHAO is committed to delivering your 4″ pipe flanges efficiently and securely, ensuring they reach you in pristine condition and within the agreed-upon timelines. We prioritize your satisfaction and convenience throughout the entire ordering and delivery process.

Customer Reviews

VII. Customer Reviews

A. Testimonials

Real Customer Feedback on Our 4″ Pipe Flanges, At YANHAO, we take immense pride in the feedback we receive from our valued customers. Here are some real testimonials highlighting their experiences with our 4″ pipe flanges:

  • John M., Engineering Manager:
    “YANHAO’s 4″ pipe flanges have been a game-changer for our oil and gas projects. The quality and reliability are unmatched. We can trust these flanges to perform flawlessly under extreme conditions.”
  • Sarah L., Procurement Specialist:
    “What sets YANHAO apart is their commitment to customization. We needed 4″ pipe flanges with unique specifications for our chemical plant, and YANHAO delivered precisely what we needed. Impressive service!”
  • Mike P., Project Engineer:
    “The technical support from YANHAO’s team has been invaluable. Their expertise helped us choose the right flanges for our power generation project, ensuring efficiency and safety.”
  • Linda T., Operations Director:
    “The delivery of our 4″ pipe flanges was prompt, and the quality exceeded our expectations. YANHAO’s attention to detail and commitment to quality truly shines through.”

B. Case Studies

  • Case Study 1: Petrochemical Plant Upgrade
    • A leading petrochemical plant required an upgrade to its piping system to handle increased production. YANHAO provided custom 4″ weld neck flanges tailored to withstand high-pressure and corrosive environments. The upgrade resulted in improved efficiency and safety, and the plant saw a significant reduction in maintenance costs.
  • Case Study 2: Offshore Drilling Rig
    • An offshore drilling company needed reliable 4″ blind flanges for their drilling rigs operating in harsh sea conditions. YANHAO supplied specially coated and corrosion-resistant flanges that exceeded expectations. The company reported reduced downtime and improved safety, enhancing their overall operational efficiency.
  • Case Study 3: Water Treatment Facility
    • A municipal water treatment facility sought durable 4″ slip-on flanges for a major expansion project. YANHAO’s flanges provided a cost-effective solution that streamlined installation and improved system reliability. The facility achieved increased water processing capacity without compromising quality.
  • Case Study 4: Construction Project
    • A large-scale construction project required 4″ lap joint flanges for the HVAC system. YANHAO’s custom flanges were designed to accommodate the project’s unique requirements. The construction was completed on time, and the building now boasts efficient heating and cooling systems.

These case studies and testimonials underscore the trust and satisfaction that customers place in YANHAO’s 4″ pipe flanges. Our commitment to quality, customization, and technical expertise has consistently resulted in successful projects and delighted customers across various industries.

Common Questions

Answering Frequently Asked Questions About Our 4″ Pipe Flanges:

Q1: What materials are available for your 4″ pipe flanges?

A1: YANHAO offers a wide range of materials for our 4″ pipe flanges, including carbon steel, stainless steel (such as 304 and 316 stainless steel), alloy steel, and non-ferrous materials like brass and copper. The choice of material depends on your specific application, including factors like corrosion resistance, temperature, and pressure requirements.

Q2: Are your 4″ pipe flanges customizable?

A2: Yes, we provide customization options for our flanges. Whether you need special dimensions, unique coatings, or specific facing types, our team can work with you to tailor our 4″ pipe flanges to meet your project’s exact requirements.

Q3: What pressure ratings are available for your 4″ pipe flanges?

A3: Our 4″ pipe flanges come in various pressure ratings, typically ranging from 150# to 2500#. The choice of pressure rating depends on the specific demands of your application, such as the system’s operating pressure and temperature.

Q4: How can I ensure a proper fit when ordering 4″ pipe flanges?

A4: To ensure a proper fit, it’s crucial to provide accurate measurements of your pipe’s outer diameter (OD). Our technical team can assist you in determining the correct size and type of flange needed for your pipes. Additionally, our detailed technical specifications can help you verify compatibility.

Q5: What facing types do your 4″ pipe flanges come with?

A5: Our 4″ pipe flanges are available with various facing types, including raised face (RF), flat face (FF), and ring-type joint (RTJ). The choice of facing type depends on your sealing method and application requirements.

Q6: How can I track the progress of my order and shipment?

A6: We provide shipment tracking information once your order is dispatched. You can use this information to monitor the progress of your order and get real-time updates on its delivery status. Our customer support team is also available to assist with any tracking inquiries.

Q7: Do you offer international shipping?

A7: Yes, we offer international shipping services. For international orders, we handle all necessary documentation and customs clearance to ensure a smooth and reliable delivery process to your location.

Q8: What certifications do your 4″ pipe flanges have?

A8: Our 4″ pipe flanges adhere to industry standards and may carry certifications such as ISO, ANSI, and ASTM. These certifications demonstrate compliance with international quality and performance benchmarks, ensuring you receive reliable products. If you have any additional questions or specific inquiries about our 4″ pipe flanges, please don’t hesitate to reach out to our dedicated customer support team. We are here to provide you with expert guidance and assistance throughout your purchasing process.

Contact Us

A. Contact Information

We encourage you to get in touch with us if you have any questions, inquiries, or require assistance with our 4″ pipe flanges. Here’s how you can reach us:

  • Phone: You can reach our customer support team by phone at +86 13313073735. Our knowledgeable representatives are ready to assist you with any queries you may have.
  • Email: For written inquiries or detailed information requests, please email us at flanges.yh@gmail.com. We aim to respond promptly to your emails and provide comprehensive answers to your questions.
  • Our Address:
    Xiaozhuangzi Road Section, Xinda Highway, Mengcun Hui Autonomous County, Cangzhou City, Hebei Province

B. Easy Quote Request Process

Requesting a quote for our 4″ pipe flanges is a simple and efficient process:

  • Visit our website contact us and navigate to the “Contact US” section.
  • Fill out the quote request form, providing details about your specific requirements, including flange type, material, quantity, and any customization needs.
  • Submit the form, and our team will review your request promptly.
  • You will receive a detailed quotation tailored to your project needs, including pricing and delivery information.
  • If you have any questions or require further assistance, our customer support team is available to guide you through the quote request process.

C. Customer Support

  1. Our Commitment to Assisting Customers: At YANHAO, we are committed to providing exceptional customer support throughout your journey with us:
  • Technical Assistance: Our experienced technical team is ready to assist you with product selection, technical inquiries, and customization options, ensuring that you make informed decisions.
  • Order Tracking: We provide shipment tracking information, enabling you to monitor the progress of your order and stay informed about delivery timelines.
  • Customization Guidance: If you require customized solutions, our experts will work closely with you to determine the ideal specifications for your 4″ pipe flanges.
  • Prompt Responses: We prioritize prompt responses to your inquiries, whether via phone, email, or our website’s inquiry form.
  • Satisfaction Guarantee: Your satisfaction is our top priority. If you encounter any issues or have specific requirements, we are dedicated to resolving them to your complete satisfaction. We value your trust in YANHAO and are committed to providing the highest level of support and assistance. Feel free to reach out to us for any inquiries or to begin the process of acquiring our high-quality 4″ pipe flanges for your projects.

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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