Table E lists flange dimensions for British Standard BS 10, including nominal size, outer diameter, thickness, bolt circle, bolt count, and hole size. It serves as a reference for designing pipe flanges, ensuring compatibility with pressure ratings and installation standards. for compliance. and
Standard References and Codes
Table E references British Standard BS 10 and American AS 2129, defining flange dimensions for pipe systems. These codes specify nominal size, flange OD, thickness, bolt circle, bolt count, and hole diameter, ensuring and compatibility,and industry and safety.
British Standard BS 10
British Standard BS 10, issued in 1962, defines flange dimensions for low‑pressure piping. Table E is the core reference, listing nominal size (DN), flange outer diameter (OD), thickness (D), bolt circle diameter (A), number of bolts (K), and bolt hole diameter (G). These parameters ensure compatibility across manufacturers and facilitate joint integrity. For each DN, the table provides precise measurements that maintain a uniform pressure‑bearing face and bolt spacing, critical for sealing and mechanical strength. The standard also specifies tolerances, allowing minor manufacturing variations while meeting required pressure ratings. Example: a 15 mm DN flange has an OD of 95.3 mm, thickness 6.4 mm, bolt circle 66.8 mm, four bolts, and a hole diameter of 14.5 mm. Larger sizes extend to 114 mm OD for a 30 mm DN flange, with special notes for blind and raised‑face variants. Compliance with BS 10 aligns with AS 2129, enabling international trade. Engineers use the PDF version of Table E to reference dimensions during design, procurement, and inspection, reducing errors and improving project efficiency. The PDF also includes illustrative drawings and sectional views, allowing engineers to verify bolt placement and flange mating. It lists recommended bolt sizes and thread types, ensuring that the mechanical fastening meets the required shear and tensile loads. Additionally, the standard addresses material grades, corrosion protection, and testing procedures. By adhering to BS 10, manufacturers can guarantee that their flanges will fit seamlessly into existing piping networks, reducing installation time and cost. The PDF’s digital nature enables quick updates and version control, ensuring that users always reference the most current specifications!!!
American AS 2129
American Standard AS 2129 defines the dimensional specifications for low‑pressure pipe flanges in the United States. The PDF version of Table E lists nominal sizes from ½ inch to 10 inch, along with flange outer diameters, thicknesses, bolt circle diameters, bolt counts, and bolt hole diameters. For each nominal size the table records the flange outer diameter (OD), flange thickness (D), bolt circle diameter (A), number of bolts (K), bolt hole diameter (G), and recommended bolt size with thread designation. For example, a 1 inch DN flange measures an OD of 95.3 mm, a thickness of 6.4 mm, a bolt circle of 66.8 mm, four bolts, and a hole diameter of 14.5 mm. The PDF also details raised‑face (RF) and blind (B) flange variants, each with specific dimensions to accommodate different installation scenarios. Engineers use the PDF to verify that the flange will mate correctly with the pipe, ensuring proper sealing and mechanical strength. The standard defines tolerances, material grades, and recommended bolt types, enabling manufacturers to produce flanges that meet safety and performance criteria. By referencing the PDF, designers can quickly access the latest specifications, reducing design time and preventing costly errors during fabrication and installation. The digital format facilitates easy updates and version control, ensuring that users always work with the most current data. The PDF contains illustrative drawings and sectional views, allowing engineers to confirm bolt placement and flange mating geometry. OK!?
Key Dimensions in Table E
Table E lists key flange dimensions: nominal size (DN), flange outer diameter (OD), flange thickness (D), bolt circle diameter (A), bolt count (K), bolt hole diameter (G), and bolt size. These values ensure proper fit, pressure rating, and installation. Use PDF for tolerance checks and grades.
In Table E, the nominal size (DN) represents the internal diameter of the pipe in millimeters, serving as the primary identifier for flange compatibility. DN values range from 15 mm (0.6 in) to 600 mm (23.6 in) in the standard, covering most industrial piping systems. The DN column aligns with the pipe’s nominal diameter, not the exact bore, allowing manufacturers to standardize flange dimensions across different materials and pressure classes. Engineers use DN to select the correct flange size, ensuring that the flange outer diameter (OD) and bolt circle (A) match the pipe’s schedule and pressure rating. For example, a 150 mm DN pipe will typically pair with a flange whose OD is 210 mm, a thickness of 6.4 mm, and a bolt circle of 114 mm, as documented in the PDF. Accurate DN identification is critical when designing connections, calculating pressure drops, and performing stress analysis, because any mismatch can lead to leakage, structural failure, or costly rework. The PDF provides a lookup table that cross‑references DN with all related dimensions, enabling quick reference for design engineers and procurement specialists alike. DN values also correlate with standard pipe schedules, where a 150 mm DN typically corresponds to a schedule 40 pipe, ensuring consistent wall thickness across flange types. When specifying DN, engineers must verify that the chosen flange’s bolt circle and outer diameter align with the pipe’s mounting flange, as mismatches can compromise joint integrity. This ensures seamless integration. !
Flange Outer Diameter (OD)
Table E provides a standardized mapping between the nominal pipe diameter and the physical dimensions of the flange that will mate with that pipe. The outer diameter (OD) of the flange is the measurement from one edge of the flange to the opposite edge, perpendicular to the bolt circle. This dimension is critical because it determines the clearance required for the flange to fit onto the pipe flange or fitting, and it also influences the overall footprint of the piping system. In the PDF, OD values are listed in millimeters for each DN value, ranging from the smallest 15 mm (0.6 in) to the largest 600 mm (23.6 in). For a 150 mm DN pipe, the corresponding OD is typically 210 mm, while a 300 mm DN pipe will have an OD of 360 mm. These values are derived from the British Standard BS 10 and are designed to accommodate the standard pipe schedules (e.g., schedule 40, 80). The OD must be matched with the bolt circle diameter (A) and the flange thickness (D) to ensure a proper seal and structural integrity. Engineers use the OD to calculate the required flange thickness, the number of bolts, and the bolt hole spacing. The PDF also includes a technical drawing that visually represents the OD, bolt circle, and flange face, providing a quick reference for designers and fabricators. measurement is essential for preventing interference during installation, ensuring proper alignment of the flange face, and maintaining the integrity of the pressure‑bearing joint.
Flange Thickness (D)
Flange thickness, designated as D in Table E, is the vertical dimension of the flange body measured from the inner face to the outer edge. It is a critical parameter that determines the structural strength, pressure rating, and weight of the flange. The BS 10 standard specifies a range of thicknesses for each nominal size, ensuring the flange can withstand the design pressure while maintaining a reasonable weight profile. For instance, a 150 mm nominal pipe size typically has a flange thickness of 12.7 mm, whereas a 300 mm size may require a thickness of 19.1 mm. These values are derived from the pipe wall thickness, the required pressure class, and the material grade. The PDF provides a table of D values in millimeters, allowing engineers to select the appropriate thickness for a given application. The thickness directly affects the number of bolts that can be accommodated, as a thicker flange can support more bolts without compromising the integrity of the bolt holes. It also determines the flange’s ability to resist bending moments and shear forces during operation. In addition, the thickness must be compatible with the bolt circle diameter (A) and the bolt hole diameter (G) to ensure a proper fit. The technical drawing in the PDF illustrates the flange thickness relative to the bolt circle and the outer diameter, giving designers a visual reference for assembly. Proper selection of flange thickness is essential for achieving a leak‑free joint, meeting industry safety standards, and optimizing material usage. (spec.) !?
Bolt Circle Diameter (A)
The bolt circle diameter, labeled as A in Table E, defines the spacing between the centers of adjacent bolt holes on a flange. This dimension is pivotal for ensuring uniform load distribution and preventing stress concentrations. In the BS 10 standard, each nominal size is paired with a specific A value that aligns with the flange’s outer diameter and thickness. For example, a 150 mm nominal pipe size typically has a bolt circle diameter of 95 mm, while a 300 mm size may use a 114 mm circle. These values are derived from the pipe’s wall thickness, the required pressure class, and the material grade. The bolt circle must accommodate the designated number of bolts (K) without compromising the flange’s structural integrity. A larger A allows for more bolts, which can enhance the flange’s strength and improve its ability to resist shear forces. Conversely, a smaller A reduces the flange’s weight but limits bolt count. The PDF provides a table of A values in millimeters, enabling engineers to select the correct bolt circle for a given application. The technical drawing in the PDF illustrates the bolt circle relative to the flange’s outer diameter, giving designers a visual reference for bolt placement. Proper selection of A is essential for achieving a leakfree joint, meeting industry safety standards,optimizing material usage.
Number of Bolts (K)
In Table E, the K column specifies the exact count of bolts that should be installed around the flange’s bolt circle. This figure is not arbitrary; it is calculated to balance the flange’s mechanical strength, pressure class, and the dimensions of the bolt circle (A). For each nominal pipe size, the standard prescribes a bolt count that ensures the flange can withstand the maximum working pressure while maintaining a uniform distribution of shear forces. The PDF lists K values in a concise table, allowing designers to quickly reference the required bolt count for a specific DN. For instance, a 150 mm nominal size may call for 4 bolts, whereas a 300 mm size might require 8 bolts. The choice of K directly influences the flange’s ability to resist torsional and radial loads, and it also impacts the ease of assembly and maintenance. When selecting bolts, engineers must also consider the bolt diameter (G) and thread size, as these parameters must match the flange’s hole size to achieve a proper fit. The PDF’s technical drawings illustrate the bolt pattern, showing the spacing between bolt holes and confirming that the chosen K aligns with the bolt circle diameter (A). Adhering to the prescribed bolt count is essential for compliance with BS 10, ensuring safety, reliability, and longevity of the piping system. Failure to match the specified bolt count can lead to uneven load distribution, increased risk of leakage, or premature failure of the flange assembly. Engineers should verify the bolt count
Bolt Hole Diameter (G)
In Table E, the G column specifies the exact diameter of each bolt hole that encircles the flange’s bolt circle. This dimension is fundamental because it dictates the bolt size that can be used, the thread engagement, and the overall mechanical strength of the flange assembly. The PDF presents a concise table where every nominal pipe size (DN) is matched with a precise G value measured in millimeters. For instance, a 150 mm flange may have a G of 16 mm, while a 300 mm flange might use a 20 mm hole. The choice of G is derived from the bolt diameter (K) and the required thread class to guarantee a secure fit. Engineers must align the bolt diameter with the G value to avoid under‑threading or over‑threading, both of which can compromise the flange’s integrity. The bolt hole diameter also determines the clearance between the bolt head and the flange face, influencing the ability to torque the bolts to the recommended torque values. In practice, the G dimension is selected to accommodate standard bolt sizes such as M12, M16, or M20, depending on the flange size. The PDF’s technical drawings illustrate the bolt pattern, showing the exact placement of each hole relative to the bolt circle diameter (A). By adhering to the specified G values, designers ensure that the flange meets the mechanical and pressure requirements set out in BS 10, providing a reliable and leak‑free joint in fluid conveyance systems. Proper bolt hole sizing is essential for maintaining the flange’s structural integrity, preventing bolt loosening, and ensuring long‑term operational safety. Additionally, the G measurement must comply with tolerance limits defined in the standard, which account for manufacturing variations and thermal expansion. Failure to observe these tolerances can lead to uneven load distribution, increased risk of fatigue, or premature failure of the flange assembly. Therefore, the G dimension is a critical parameter that must be carefully selected and verified during the design and fabrication stages to guarantee a robust and compliant flange connection.
Common Flange Types Covered
Table E covers raised‑face (RF) and blind (B) flanges, detailing dimensions for each nominal size. These types are standard in pipelines, offering reliable sealing and support for varying pressure classes.
PDFs give quick flange size data for engineerses.
Raised Face (RF)
Table E supplies dimensional data for raised‑face (RF) flanges, the most common type in fluid‑conveying systems. Each nominal pipe size (DN) lists flange outer diameter (OD), thickness (D), bolt‑circle diameter (A), bolt count (K), and bolt‑hole diameter (G). Values appear in inches and millimetres, enabling quick conversion for designers. For instance, a 3‑inch (DN 75) flange has an OD of 95 mm, a thickness of 6.4 mm, a bolt‑circle of 66.7 mm, four bolts, and a bolt‑hole of 12.7 mm. The PDF format allows easy download, printing, or embedding in drawings. Engineers use the data to confirm fit with pipe schedule, pressure class, and bolt‑spacing. The raised‑face design offers a flat sealing surface, ideal for gasket‑seal assemblies and quick inspection. Because both metric and imperial units are present, the table serves as a universal reference, ensuring consistency with BS 10. Technical drawings illustrate flange geometry, helping designers verify profile compliance. By referencing Table E, engineers can confidently select the correct RF flange, ensuring safety and regulatory compliance. The table also lists bolt‑hole spacing and permissible bolt size, critical for structural integrity under pressure. A legend explains abbreviations such as ‘A’ for bolt‑circle diameter and ‘G’ for bolt‑hole diameter, making it user‑friendly even for newcomers. Including nominal and actual dimensions prevents mis‑matching of flanges and pipes, reducing leak or failure risk. The PDF’s accessibility makes it a valuable tool for engineers who need to verify flange sizes on the spot today. Because the table includes nominal dimensions, it eliminates guesswork and ensures compliance with safety standards.
Blind (B)
Blind flanges, as defined in Table E, are designed for pipe sections that terminate without a through‑hole. The table lists the same core dimensions as raised‑face flanges—outer diameter (OD), flange thickness (D), bolt‑circle diameter (A), bolt count (K), and bolt‑hole diameter (G)—but the internal geometry differs. The bolt‑hole diameter (G) is typically 12.7 mm for a 3‑inch (DN 75) flange, while the bolt‑circle (A) is 66.7 mm, providing a 4‑bolt arrangement (K = 4). The PDF also includes a legend clarifying abbreviations such as ‘A’ for bolt‑circle diameter and ‘G’ for bolt‑hole diameter. By using the blind flange data, designers can ensure proper gasket seating, avoid leakage, and maintain structural integrity under operating pressure. The table’s format supports rapid lookup, making it a staple reference for mechanical engineers preparing drawings, selecting hardware, and verifying compliance with BS 10. The PDF’s accessibility allows on‑site verification, reducing the risk of mismatched components and enhancing overall system safety. The design ensures a tight seal. and prevents leaks. for safety.?
Downloading and Using the PDF
Accessing the official Table E flange dimensions PDF is straightforward. The primary source is the British Standards Institution (BSI) website, where the document is listed, and a free preview is available, but full download requires a one‑time purchase or subscription. Many distributors, such as Atlas‑Steels, also host a copy on their product pages, often linked directly from the flange specification section. Once the PDF is saved locally, open it with any standard viewer (Adobe Reader, Foxit, or the browser’s built‑in PDF viewer). The file is organized into a tabular format with columns for nominal size (DN), flange outer diameter (OD), flange thickness (D), bolt‑circle diameter (A), bolt count (K), and bolt‑hole diameter (G). Each row lists a pipe size, from ½ inch to 10 inch, and includes a separate section for blind flanges, ensuring designers can quickly match dimensions to the required pressure class. The PDF also contains a set of technical drawings that illustrate the flange geometry, including the bolt‑hole layout and gasket seat. These drawings can be imported into CAD software by exporting the PDF as a vector file (e.g., SVG) or by using a PDF‑to‑DWG conversion tool. For teams sharing data, the PDF can be embedded in a project folder or shared via a cloud service, ensuring stakeholders have the same reference. Use the table for quick checks. See.
