Nominal Pipe Size (NPS)
The nominal pipe size indicates the standard diameter of the pipe that the threaded flange is designed to connect with. Common sizes range from small-diameter pipes such as 1/2 inch to larger sizes depending on application requirements.
Flange Outside Diameter (OD)
The flange outside diameter refers to the total width of the flange across its outer edge. This dimension determines the flange’s compatibility with bolt holes, gaskets, and connecting equipment.
Flange Thickness
Flange thickness affects the overall strength and pressure resistance of the threaded flange. Thicker designs are typically used for higher-pressure applications and more demanding industrial environments.
Bolt Hole Diameter and Number
The bolt hole size and quantity are important dimensions for securing the threaded flange connection. They must match the flange standard and ensure proper alignment during installation.
Thread Size and Type
The internal thread dimensions define how the flange connects with the pipe. Common thread types include NPT and BSP, with accurate thread machining ensuring reliable sealing performance.
Pressure Rating Class
Threaded flange dimensions are also related to pressure ratings, such as Class 150, 300, 600, and higher. The pressure class determines the flange’s ability to withstand operating pressure and temperature conditions.
Threaded Flange FAQs
What is a Threaded Flange?
A Threaded Flange is a type of pipe flange with internal threads that allow it to connect directly to threaded pipes without welding. It provides a convenient solution for pipeline systems where welding is not suitable.
What are the advantages of Threaded Flanges?
Threaded Flanges offer easy installation, simple maintenance, no welding requirements, and reliable connection performance. They are especially suitable for small-diameter piping systems and applications where welding is difficult.
Where are Threaded Flanges commonly used?
They are widely used in water supply systems, chemical processing, fire protection systems, compressed air pipelines, oil and gas applications, and low to medium-pressure industrial piping systems.
What materials are Threaded Flanges available in?
Threaded Flanges are commonly manufactured from carbon steel, stainless steel, alloy steel, and other durable materials. The material selection depends on pressure requirements, temperature conditions, and corrosion resistance needs.
What is the difference between a Threaded Flange and a Welding Flange?
A Threaded Flange connects to pipes through internal threads without welding, making installation faster and easier. Welding flanges require welding to create a permanent connection and are typically used for higher-pressure applications.
How do I choose the right Threaded Flange?
The selection should consider pipe size, thread type, pressure rating, flange standard, material grade, temperature range, and application environment to ensure safe and reliable pipeline performance.