Pad Flanges / Studding Outlet Flanges

Understanding your choice of pad flanges options

There are many factors to consider when choosing the right pad flange. From the type of piping system being used to the type of material used for the pad flange, every decision you make can have a significant impact on the overall performance and life of the system.

What are pad flanges?

Pad Flanges is also called studding outlet flange. Studding outlet flanges are a type of flange used to convert high pressure pipelines, wellheads and oil recovery tree systems to common size and pressure piping systems.

The pad flange is a conversion connecting flange, mainly applicable to the conversion connection between the high-pressure pipeline system, such as API 6A or API 17D, and the ordinary flange of different sizes and pounds, such as ASME B16.5.

Advantages of studding outlet flanges

The studding outlet flange has the following two main advantages:

• (1) The studding outlet flange is a detachable connection that is flexible, straightforward to install, and easy to operate and maintain.
• (2) The studding outlet flange can be used for the transition connection between flanges of different standards and between flanges of different sizes of the same standard, thus significantly reducing the installation workload, speeding up the progress of the project, and saving installation costs, especially in an environment with highly complex working conditions.

Types of Pad Flanges

There are three main types of studding outlet flange based on flange face surface:

Raised Face Pad Flanges
Raised face pad flanges have a raised surface around the borehole, which provides a better seal between the flange and the gasket. These types of pad flanges are commonly used in low-pressure applications. They are easy to install and remove and provide a stable connection between pipes.
Flat face pad flanges have a flat surface around the borehole, which makes them ideal for applications where the flange needs to be easily aligned or rotated. They are commonly used in low-pressure applications and are easy to install and remove.
Ring-Type Joint Pad Flanges
Ring-type joint pad flanges have a groove around the borehole, accommodating a metal ring gasket. These types of pad flanges are commonly used in high-pressure and high-temperature applications. The metal ring gasket provides a secure and reliable seal, even in harsh environments.

Materials of Pad flanges

Depending on the specific application requirements, pad flanges are made from a variety of metal materials, including:

Dimensions of Pad flanges

Studding outlets are available in sizes from 1/2” thru 24” and pressure classes from 150# thru 2500#. Studding outlets can be provided as flat as well as contoured bottoms to fit the O.D. or I.D. of shells, heads or cones. Offsets from vessel/head centerlines can also be accomodated. We can provide special machining for sight glass assemblies in accordance with your specified dimensions. We can also provide air test holes upon request.

• rf: in Pressure Classes 150 and 300, the height of raised face is approximately 1/16 inch. In Pressure Classes above, the height of rf is approximately 1/4 inch.
• Thickness: the standard thickness shown above for all studding outlets is the minimum required per ASME Section VIII Division I Paragraph UG-43(d) for thread engagement and an ID mount. It is important to note that each individual application should be analyzed for proper thickness.
• Facing: the Studding Outlet minimum thickness “T” includes proper raised face per ANSI B16.5. Outlets can be supplied with any special facing as needed upon request.
• Drilling and Tapping: studding Outlets are furnished to ANSI B16.5 specifications unless otherwise specified. Thread depth is in accordance with ASME Section VIII Division I Para. UG-43(g) for a design temperature not to exceed 650ºF, a base metal stress of 17,500 psi(g), and a stud stress of 25,000 psi(g). All other materials exceeding these stresses should be checked for UG-43 compliance.
• Bore: bore sizes shown above are standard. Other sizes can be furnished upon request.
• Curving: connections can be furnished contoured to fit any shell, head, or cone.

Dimensions of Class 150 Studding Outlets or Pad Flanges

Dimensions are in inches. Weights are in pounds.

Dimensions of Class 300 Studding Outlets or Pad Flanges

Dimensions are in inches. Weights are in pounds.

Dimensions of Class 600 Studding Outlets or Pad Flanges

Dimensions are in inches. Weights are in pounds.

Dimensions of Class 900 Studding Outlets or Pad Flanges

Dimensions are in inches. Weights are in pounds.

Dimensions of Class 1500 Studding Outlets or Pad Flanges

Dimensions are in inches. Weights are in pounds.

Dimensions of Class 2500 Studding Outlets or Pad Flanges

Dimensions are in inches. Weights are in pounds.

Pad flange design

As a sealing connection element, the flange plays a vital role in the pipeline system. With the continuous development of modern industry, the application of flanges has become more and more extensive. It has involved almost all fields related to the national economy and people’s life, such as machinery, petroleum, chemical industry, energy, and metallurgy. The application environment of flanges has also become quite complex. In order to regulate the correct use of flanges in this industry, countries have formulated corresponding standards in various fields. For example, the American Petroleum Institute API has formulated the standards of API 6A and API 17D; the American Society of Mechanical Engineers ASME has formulated the ASME B16.5 and ASME B16.47 standards so on. Therefore, under different working conditions, how to make compatible connections between standard flanges and mixed-use in the same pipeline system has become a problem that engineering needs to solve. The traditional practice is to use common flanges at both ends and weld them together with small and large heads in the middle for connection. This will greatly increase the workload of the project installation; in addition, due to the restrictions of the location, it will cause welding stress concentration and will also bring trouble to the installation and disassembly of the flange. Therefore, in this case, the design of the pad flange is born.

Technical characteristics of studding outlet flanges

A Pad flange is a conversion connection flange that can realize the transition connection between different flanges. It has both similarities and differences with ordinary flanges.

First of all, before designing the studding outlet flange, you need to understand the pressure conditions of the pipeline in which the flange is located, and the specifications of the flange connected to both ends, including pressure level, shape, size, etc., and then design the studding outlet flange to achieve a compatible connection of two different flanges.

Studding outlet flange material selection

Studding outlet flange material selection should be fully considered the working conditions of the pipeline, including pressure pounds, temperature, and other uncertainties generated by the load and so on. Therefore, in selecting materials, choose the appropriate level of performance and strength of the material to save events of the working Condit the ions and not cause material waste. You can refer to API 6A standard to choose common materials, and then decide whether they meet the requirements by strength calculation.

As for the material selection of the supporting bolts, just the common flange, the actual working load under the operating conditions should be considered to determine the bolts’ reconsider. In addition, it is also necessary to take into account the factor that electrochemical corrosion will occur when carbon steel is in contact with stainless steel. The gasket selection is the same as that of the common flange. It is necessary to choose the winding gasket or metal ring gasket according to the form of flange sealing surface, mainly considering the sealing performance of the gasket.

Size design of studding outlet flange

The studding outlet flange plays a transitional role in the whole pipeline system, and the two ends of the flange are connected with two di; the sizes of flanges. Therefore, the flange can be regarded as composed of two parts, the size of the connecting surface of these connecting surface’s dimensions include the sealing surface’s fomented. The connecting surface’s dimensions include the sealing surface’s form, the size and number of bolt holes, etc. It should be noted that the bolt hole of the studding outlet flange is a threaded hole, not a through hole, and the nominal diameter of the threaded hole is equal to the bolt diameter of the connecting flange respectively.

In addition, the outer diameter of the studding outlet flange is often taken to connect the maximum outer diameter of the flange; that is, the studding outlet flange is processed into a cylindrical shape, which can make the appearance more beautiful, but also to increase the strength of the flange.

As for the thickness of the flange, it is necessary to consider the depth of the bolt hole and the strength of the flange to decide.

Strength check of the studding outlet flange

After the material and size of the studding outlet flange are determined, the next step is to combine the actual working conditions of the flange and its supporting bolts for force analysis and strength checks to confirm whether it meets the working requirements. Usually, finite element analysis software is used to analyze and calculate the flange, such as ANSYS finite element analysis software, with a wide range of applications. This gives a better visualization of the stress-strain distribution in the flange body.

Manufacturing process of Pad flanges

Pad flanges can be produced by forging, casting. We mainly produce flanges by forging, cutting and rolling processes. We will take you through the step-by-step process of manufacturing pad flanges, from the materials used to the final product.

Step 1: Material Selection
The first step in our manufacturing process is material selection. We use only the highest quality materials, including carbon steel, stainless steel, and alloy steel. Each material has its own unique properties and is selected based on the specific needs of the customer.
Step 2: Cutting
Once the materials are selected, they are cut to the desired size using a cutting machine. We use state-of-the-art cutting machines to ensure precision and accuracy in every cut.
Step 3: Heating
After the materials are cut, they are heated to the desired temperature. This helps to reduce any stresses in the material and makes it easier to shape the flange.
Step 4: Forming
The next step in our manufacturing process is forming the flange. We use a hydraulic press to shape the heated material into the desired shape. This ensures that each flange is formed with precision and accuracy.
Step 5: Solid solution
Make the structure and composition of the blank flange uniform, which is particularly important for raw materials. At high temperatures, atomic activity intensifies, σ Phase dissolution, the chemical composition tends to be uniform, and a uniform single-phase structure is obtained after rapid cooling.
Eliminate work hardening to facilitate continuous cold work. The distorted lattice is recovered through solution treatment, the elongated and broken grains are recrystallized, the internal stress is eliminated, the tensile strength of stainless-steel forgings decreases, and the elongation increases.
Restore the inherent corrosion resistance of the flange blank. Due to carbide precipitation and lattice defects caused by cold working, the corrosion resistance of the flange blank is reduced. The corrosion resistance of forgings recovered to the best state after solution treatment.
Step 6: Machining
Once the flange is formed, it undergoes machining to ensure that it is smooth and free from any imperfections. We use CNC machines to achieve the highest level of accuracy in our machining process.
Step 7: Inspection
Before the flange is considered complete, it undergoes a thorough inspection process to ensure that it meets industry standards. Our team of experts inspects each flange to ensure that it is free from any defects and meets the specifications of the customer.
Step 8: Coating
Once the inspection process is complete, the flange is coated to protect it from corrosion and other environmental factors. We offer a variety of coating options, including epoxy, zinc, and galvanized coatings.
Step 9: Packaging and Delivery
Finally, the flange is packaged and prepared for delivery to the customer. We take great care in packaging our products to ensure that they arrive at their destination in pristine condition.
At Guanxin, we take great pride in our manufacturing process of pad flanges. We are committed to producing high-quality flanges that meet the needs of our customers. Contact us today to learn more about our products and services.

Marking of Pad flanges

The marking of pad flanges is essential to their manufacture and use. The marking aims to provide information about the flange’s material, size, pressure rating, and other relevant details.
Pad flanges are typically marked by industry standards, such as ASME B16.36 or API 6A. These standards specify the required information that must be included on the flange, as well as the format and location of the markings.
The required information typically includes the following:

• Flange size
• Pressure rating
• Material specification
• Bore diameter
• Tag number
• Manufacturer’s name or trademark
• Heat number or lot number
• Date of manufacture

The standard also specifies the location of the marking on the flange. Typically, the marking is placed on the raised face of the flange near the bolt holes. In some cases, the marking may be located on the flange hub or the pad plate itself.

Packing of Pad flanges

How to package pad flanges? To pack the pad flange, follow these steps:
When it comes to packaging pad flanges, it’s important to ensure that they are properly protected and secured during transportation to prevent any damage. We will walk you through some of the key steps to follow when packaging pad flanges.
Step 1: Clean and Inspect the Flanges
Before packaging the pad flanges, it’s essential to clean them thoroughly to remove any dust, dirt, or debris that may have accumulated on them. You can use a cloth or brush to clean the flanges and inspect them to ensure they are free from any defects or damages.
Step 2: Choose the Right Packaging Material
The packaging material you choose should be sturdy and able to provide adequate protection to the flanges during transportation. Ideally, you should use a strong cardboard box or wooden crate that can withstand the weight and size of the pad flanges.
Step 3: Secure the Flanges
Once you have the packaging material ready, you need to secure the flanges to prevent them from moving around or getting damaged during transit. You can use bubble wrap, foam, or any other suitable cushioning material to protect the pad flanges from impact or shock.
Step 4: Label the Package
Labeling the package correctly is crucial to ensure that it reaches the intended destination without any confusion. You should clearly label the package with the recipient’s address, contact information, and any other necessary details.
Step 5: Arrange for Shipping
After the package is fully prepared and labeled, it’s time to arrange for shipping. You can use a reliable courier or shipping company to ensure that the package is delivered on time and in good condition.
Packaging pad flanges requires careful planning and attention to detail. By following the above steps, you can ensure that your flanges are properly protected and arrive at their destination safely. Remember to use high-quality packaging materials, secure the pad flanges properly, and label the package accurately to avoid any mishaps during transportation.

Inspection and measurement of Pad flanges

There are several factors that need to be considered when inspecting and measuring pad flanges, including:

Material
The first thing to inspect in a pad flange is the material. The standard specifies that the flanges should be made from materials such as carbon steel, stainless steel, or alloy steel. The material should be free from any defects such as cracks, porosity, or inclusions that can affect the integrity of the flange.
Dimension
The next thing to inspect in a pad flange is its dimension. The standard specifies the dimensions of the flanges based on their nominal size and pressure rating. The flanges should be inspected for their inside and outside diameter, thickness, and overall dimensions to ensure they meet the requirements of the standard.
Surface Finish
The surface finish of a flange is also important. The standard specifies that the flanges should have a smooth and even surface finish to ensure proper sealing of the gasket. Any roughness or irregularities on the surface of the flange can lead to leaks in the piping system.
Bolt Hole Alignment
The bolt holes in a flange should be aligned properly to ensure the bolts can be inserted and tightened correctly. The bolt holes should be inspected to ensure they are in the correct position and are not misaligned.
Bolt Hole Size
The size of the bolt holes is also important. The standard specifies the size of the bolt holes based on the nominal size and pressure rating of the flange. The bolt holes should be inspected to ensure they are the correct size and are not damaged.
Bolt Hole Thread
The threads in the bolt holes are important to ensure the bolts can be screwed in and tightened properly. The threads should be inspected to ensure they are clean and free from any damage or defects.

To inspect and measure pad flanges, you will need a set of calipers or a micrometer to accurately measure the dimensions of the flange. It is also a good idea to have a torque wrench on hand to ensure that the bolts are tightened to the correct torque specification.

Application of Pad flanges

Pad flanges are widely used in various industries, including oil and gas, chemical, petrochemical, power generation, water treatment, and HVAC. Some common applications of pad flanges are:

• Pumps, Valves, and vessels in manufacturing and food processing.
• Pipe connections in industrial waterworks.
• Heat exchangers and heating systems of all sizes.
• Mining support.
• Nuclear power systems.
• Plumbing and mechanical systems.
• Assemblies in the oil, gas, and petrochemical industries.
• Fire protection systems.

How to purchase the correct pad flanges?

Are you in the market for pad flanges but don’t know where to start? Don’t worry, you’re not alone. With so many options available, it can be overwhelming to choose the right flanges for your project. We’ll go over some key factors to consider when purchasing pad flanges to ensure that you make the right decision.
Determine the Material Needed
The first step to purchasing the correct pad flanges is to determine the material you need. These flanges are available in a variety of materials, including carbon steel, stainless steel, and alloy steel. The choice of material will depend on the specific application and environmental conditions. If you’re unsure which material to choose, consult with a qualified engineer or supplier to help guide you in making the right decision.
Identify the Flange Face Type
Flange face types refer to the surface finish of a flange, and there are many different types of flange face finishes, including flat face (FF), raised face (RF), ring-type joint (RTJ), tongue and groove (T&G), male and female face (M&F). Each type of flange face has its unique characteristics and is suitable for different applications.

• Flat face (FF): This type of flange face has a flat, smooth surface that is perpendicular to the axis of the pipe. It is typically used for low-pressure applications and when the sealing is achieved by a gasket.
• Raised face (RF): This type of flange face has a raised ring on the surface that surrounds the bolt holes. The ring provides a surface for the gasket to rest on, which helps to create a better seal. It is commonly used in applications with moderate pressure.
• Ring joint face (RTJ): This type of flange face has a specially designed groove to accommodate a metallic ring gasket. The groove is cut into the surface of the flange, and the gasket sits in the groove to create a tight seal. This type of flange face is typically used in high-pressure applications.
• Tongue and groove face (T&G): This type of flange face has a raised tongue on one flange and a matching groove on the other flange. The tongue fits into the groove, creating a tight seal without the need for a gasket. This type of flange face is often used in applications where high pressure and temperature are involved.
• Male and Female Face (M&F): This type of flange face is similar to the tongue and groove face. However, it has a male and female end which creates a face to face contact between two flanges. This type of flange is mainly used for low pressure and low temperature applications.

To identify a specific flange face type, you need to provide me with more information, such as the flange’s application, dimensions, and material.
Determine the Pad flange Size and Pressure Class
Once you have identified the material and pad flange type, the next step is to determine the size and pressure class of the pad flange. pad flanges are available in various sizes and pressure ratings, and it’s crucial to select the correct size and pressure class to ensure that the flange can withstand the intended operating conditions. You should consult the system specifications and design to determine the appropriate size and pressure class.
Look for Quality and Certifications
It’s essential to ensure that the pad flanges you purchase are of high quality and come with the necessary certifications. Look for suppliers that have a reputation for delivering high-quality products, and check for relevant certifications, such as ISO 9001, API, and CE, to ensure that the flanges meet industry standards.
Consider the Price
While the price should not be the only factor to consider when purchasing pad flanges, it’s important to compare prices from different suppliers to ensure that you’re getting a fair price. However, remember that the cheapest option may not always be the best quality, so ensure that you’re not compromising on quality in pursuit of lower costs.
Purchasing the correct pad flanges can be challenging, but by considering the factors outlined in this post, you can ensure that you make an informed decision that meets your project requirements. Remember to consult with experts and compare suppliers to ensure that you’re getting a high-quality product at a fair price.

How to select pad flanges manufacturer?

Selecting the right manufacturer for pad flanges can be a daunting task. With so many options available, it’s easy to get overwhelmed and make the wrong choice. However, choosing the right manufacturer is critical to ensure that you get the best quality flanges that meet your specific needs. We provide some tips to help you select the right pad flanges manufacturer.
Quality of Products
The first factor to consider when selecting a pad flanges manufacturer is the quality of their products. You should look for a manufacturer that uses high-quality materials and follows strict quality control processes to ensure that their products meet the required standards.
Industry Experience
Another factor to consider is the manufacturer’s industry experience. Look for a manufacturer that has been in the industry for a significant period and has a proven track record of delivering high-quality products to their customers. An experienced manufacturer will have a better understanding of the market and the needs of their customers.
Production Capacity
It is also essential to consider the production capacity of the manufacturer. You should look for a manufacturer that has the capacity to produce the required quantity of flanges in a timely manner to meet your project’s needs.
Pricing
Pricing is another crucial factor to consider when selecting a pad flanges manufacturer. While it is essential to look for a manufacturer that offers competitive pricing, it is equally important to consider the quality of their products. Don’t compromise on the quality of the products for the sake of saving a few dollars.
Customer Service
The final factor to consider is the manufacturer’s customer service. Look for a manufacturer that has excellent customer service and is willing to assist you with any queries or concerns you may have. A manufacturer that values their customers will provide a better overall experience.

Choosing the right pad flanges manufacturer is essential to ensure you get high-quality products that meet your needs. Look for a manufacturer with quality certifications, experience, a good reputation, customization capabilities, and a competitive price. By following these tips, you will be able to find the right manufacturer for your flange needs.

Why Choose Guanxin to Be Your Pad Flange Supplier?

Guanxin is a well-established and reputable manufacturer and supplier of pad flanges that has been providing high-quality products to customers worldwide for many years. Here are some reasons why you might choose Guanxin to be your pad flange supplier:

• High-quality products: Guanxin is committed to providing high-quality pad flanges made from the best materials and manufactured to the highest standards. The company has strict quality control procedures in place to ensure that each product meets or exceeds customer expectations.
• Competitive pricing: Guanxin offers competitive pricing on its products, which means you can get high-quality pad flanges at an affordable price.
• Wide range of products: Guanxin offers a wide range of pad flanges, including ANSI, DIN, JIS, EN, and other international standards. This means you can find the right product to meet your specific needs.
• Excellent customer service: Guanxin is committed to providing excellent customer service and support to all of its customers. The company has a team of experienced professionals who are available to answer any questions or concerns you may have.
• Fast delivery: Guanxin understands the importance of timely delivery and works hard to ensure that all orders are shipped out quickly and efficiently.

Guanxin is a reliable and trustworthy supplier of pad flanges that can meet your needs and exceed your expectations.

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