All dimensions are in mm. BS 10:1962 Table E Plate Flange. Size. A. B. C. D. E. No Of Bolts. ½”. 95.00. 22.30. 6.40. 66.70. 12.70. 4.00. ¾”. 102.00. 27.70...
In the realm of mechanical engineering, the selection of the right components is crucial for the success of any project. One such component, the Table E Flange, plays a significant role in various industries, including automotive, aerospace, and oil & gas. This article delves into the dimensions of Table E Flanges in millimeters (mm), focusing on the Indian market.
Table E Flanges, also known as raised face flanges, are a type of pipe fitting used to connect pipes or to attach a pipe to a vessel or equipment. They are called 'Table E' because their dimensions are defined in the ASME B16.5 standard, which is often referred to as 'Table E' in engineering circles. These flanges have a raised face that provides a better seal compared to other types of flanges.
The ASME B16.5 standard defines the dimensions of Table E Flanges. These dimensions are provided in inches, but they can be easily converted to millimeters (mm) for use in India, where the metric system is prevalent. The standard covers flanges with nominal pipe sizes (NPS) ranging from 1/2" to 24" and pressure ratings from 150# to 2500#.

| NPS (Inches) | NPS (MM) | Flange Thickness (MM) | Bolt Circle Diameter (MM) | Bolt Hole Diameter (MM) |
|---|---|---|---|---|
| 1/2 | 12.7 | 12.7 | 76.2 | 19.05 |
| 3/4 | 19.05 | 12.7 | 101.6 | 22.23 |
| 1 | 25.4 | 12.7 | 127 | 25.4 |
| 1-1/4 | 31.8 | 12.7 | 152.4 | 31.8 |
| 1-1/2 | 38.1 | 12.7 | 177.8 | 38.1 |
To convert inches to millimeters, you can use the conversion factor 1 inch = 25.4 mm. For example, to convert 1/2" to mm, you would calculate 12.7 mm (1/2 * 25.4).
Several manufacturers in India produce Table E Flanges according to the ASME B16.5 standard. Some of these manufacturers include Larsen & Toubro, Tata Consulting Engineers, and BHEL. These flanges are widely available in major cities like Mumbai, Delhi, Bengaluru, and Chennai.
When selecting Table E Flanges, engineers must consider several factors, including:

Understanding the dimensions of Table E Flanges in millimeters is crucial for Indian engineers to ensure the correct selection and application of these components. This article has provided a comprehensive guide to the dimensions of Table E Flanges according to the ASME B16.5 standard, along with information on their availability in India and factors affecting their selection. By considering these factors, engineers can ensure the safe and efficient operation of their systems.
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