The term “flange” is also used for a kind of tool used to form flanges. A blind flange is a plate for covering or closing the slip on flange dimensions pdf of a pipe.
A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together. Common flanges used in plumbing are the Surrey flange or Danzey flange, York flange, Sussex flange and Essex flange. Surrey and York flanges fit to the top of the hot water tank allowing all the water to be taken without disturbance to the tank. They are often used to ensure an even flow of water to showers. An Essex flange requires a hole to be drilled in the side of the tank. There is also a Warix flange which is the same as a York flange but the shower output is on the top of the flange and the vent on the side. The York and Warix flange have female adapters so that they fit onto a male tank, whereas the Surrey flange connects to a female tank.
There are many different flange standards to be found worldwide. To allow easy functionality and interchangeability, these are designed to have standardised dimensions. Further, many of the flanges in each standard are divided into “pressure classes”, allowing flanges to be capable of taking different pressure ratings. 47 are typically made from forged materials and have machined surfaces. 47 covers NPSs from 26″ to 60″. 150, 300, 400, 600, 900, 1500 and 2500 for B16.
47 delineates its flanges into pressure classes 75, 150, 300, 400, 600, 900. Instead, the maximum pressure depends on the material of the flange and the temperature. These flanges are recognized by ASME Pipe Codes such as ASME B31. 1 Power Piping, and ASME B31. In addition, there are many “industry standard” flanges that in some circumstance may be used on ASME work. ASTM A193 B16 Stud Bolts are used as these have high tensile strength. Similar to ASME flanges, EN1092-1 steel and stainless flanges, have several different versions of raised or none raised faces.
Even though most of the stainless steel flanges are made within Asia, there are still several factories that still produce in Europe such as Flanschen Werk Hüttental GmbH, Swiss Fittings AG, and Beblitz Flansche. These manufacturers mainly produce for oil pipelines in which Asian origin of flange is prohibited. As the Compact flange size increase it becomes relatively increasingly heavy and complex resulting in high procurement, installation and maintenance costs. Large flange diameters in particular are difficult to work with, and inevitably require more space and have a more challenging handling and installation procedure, particularly on remote installations such as oil rigs. The principle design of the flange face includes two independent seals.