A Double Studded Adapter (DSA) is a type of flange designed with a through bore and a ring groove on each side, making it highly versatile for various connection needs.

It features bolt hole sets on both faces and is installed using tapped end studs and nuts.

The key characteristic of a DSA is that it connects two sides that are different in size and/or pressure rating.

Unlike a spacer flange, which has the same size and pressure rating on both sides, the DSA is specifically used to connect pipes or equipment with different nominal sizes, pressure ratings, or configurations.

  

Double Studded Adapter flanges are essential in systems where pressure and size configurations may vary, enabling seamless connections across different components without compromising performance. These adapters are commonly used in industries like oil, gas, petrochemical, and more.

Specifications:

Flange Thickness (mm):

Other sizes and pressure ratings are available upon request.

A Double Studded Adapter (DSA) is a specialized flange used to connect two components of different sizes and/or pressure ratings in piping systems.

Designed with a through bore and ring grooves on both sides, the DSA provides a secure, pressure-tight connection. Its most notable feature is the bolt hole sets on both faces, allowing for fast and secure installation using tap-end studs and nuts.

Unlike spacer flanges—which connect components with the same size and pressure class—a DSA is specifically engineered to bridge components that vary in nominal size, pressure rating, or flange design standard. This makes DSAs ideal for connecting equipment like wellheads, valves, BOP stacks, and other oilfield components that require compatibility across different interfaces.

Double Studded Adapter flanges are essential in industries such as oil and gas, petrochemical, and power generation, where system configurations may vary but reliable pressure integrity must be maintained. The flexibility of a DSA minimizes downtime and eliminates the need for costly and time-consuming modifications to existing systems.

DSAs are available in a variety of flange thicknesses, tailored to match specific size and pressure combinations. Below are some standard configurations:

Custom sizes, pressure ratings, and material options are also available upon request to meet specific project or environmental requirements.

Drawing:

 

To visually represent the Double Studded Adapter (DSA), the drawing would include:

1. Overview:

   • A through bore in the center of the flange.

   • Ring grooves on both sides of the flange to accommodate gaskets and seals.

   • Bolt hole sets located around the perimeter of both faces of the flange for stud and nut installation.

2. Dimensions:

   • Exact measurements for each face and the through bore.

   • Flange thickness as per the sizes listed in the specifications.

3. Design Features:Side 1: Larger size or pressure rating (can be specified according to the system).

4.  

   • Side 2: Smaller size or pressure rating (also adjustable depending on connection needs).

   • Tapped ends where the studs and nuts are installed, ensuring a secure connection.

 

1. Design and Construction:

   • Outer Diameter: The dimensions would depend on the size of the flange required, usually based on the API 6A standards.

   • Thickness: The flange thickness will also be based on the size and material class.

   • Bolt Holes: These would be positioned around the perimeter of the flange (the number and size of holes depend on the specific standard and size of the flange).

   • Gasket Sealing Surface: This area would be machined to ensure a proper seal when installed.

   • No Central Hole: The key difference from regular flanges—no opening to allow fluid to pass through.

2. Material Classes and Specifications:

   • Material Classes: BB, CC, DD, EE, FF (various materials like carbon steel, stainless steel, alloy steel).

   • Performance Requirements: PR1, PR2, depending on pressure and temperature requirements.

   • Temperature Class: L-U (used for a specific temperature range).

   • Product Specification Level: PSL1, PSL2, PSL3, PSL4, indicating the quality level and testing requirements.

3. Testing and Quality Assurance:

   • Hardness Test: Ensures the material hardness meets specified standards.

   • MT (Magnetic Test): Ensures there are no surface defects.

   • NT (Nondestructive Testing): Ensures structural integrity without damaging the material.

   • Hydrostatic Test: Checks the pressure withstand capability of the flange.

Now, I’ll outline how to create the drawing:

• View: A side profile and top-down view of the blind flange.

• Dimensions: Include bolt hole locations, outer diameter, thickness, gasket sealing area, and material specifications.

• Labeling: Proper labeling for each feature (e.g., bolt holes, gasket surface, thickness, etc.), and note the material class, temperature class, and testing methods.

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