The Ultimate Guide to Understanding Stainless Steel Flange Dimensions



Stainless steel flanges are widely used in various industries to connect pipes, valves, and equipment. One of the most critical factors that determine the flange's functionality and compatibility is the dimensions of the flange. In this blog post, we will discuss the different types of stainless steel flange dimensions and their application. Whether you're a beginner or an experienced professional, this guide will provide you with all the information you need to understand the ins and outs of stainless steel flange dimensions.

There are several types of stainless steel flange dimensions that are widely used in the industry. The most common ones include the following:

Nominal Pipe Size (NPS): This refers to the diameter of the pipe in which the flange will be attached. The NPS dimensions range from ½ inch to 24 inches and are classified in different schedules.

Flange Outer Diameter (OD): The outer diameter of the flange is measured across the flange from one end to another. It is essential to match the OD of the flange with the OD of the pipe to ensure a proper fit.

Bolt Circle Diameter (BCD): The BCD refers to the diameter of the bolt circle, which is the circle drawn through the centers of the bolts. The dimensions of BCD are determined by the NPS and the pressure class of the flange.

Flange Thickness (FT): The flange's thickness is measured from the face of the flange to the center of the bore. It is crucial to select the right thickness to ensure adequate support and protection against leakage.


In addition to the different types of dimensions, stainless steel flanges also come in various classes and pressure ratings. The pressure rating of a flange determines its ability to withstand pressure and temperature. The most commonly used pressure classes are 150, 300, 600, 900, 1500, and 2500. The pressure ratings of a flange must match the pressure ratings of the connecting pipes and equipment to maintain optimal performance.


Application Of Stainless Steel Flange Dimensions

Stainless steel flanges are used in various applications, including chemical processing plants, oil refineries, power generation plants, and water treatment facilities, to name a few. The dimensions of the flange play a crucial role in the application's success, as they determine the flange's ability to withstand the pressure and temperature of the system. For instance, a flange with a higher pressure rating is suitable for high-pressure applications, while a flange with a lower rating is perfect for low-pressure applications.

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