Use this tool to calculate the volume of a horizontal drum with a measured liquid level.

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This page provides a starting point when dealing with equipment or piping according the Pressure Equipment Directive. The first step is usually to determine the classification category of the equipment or piping. This classification defines the further requirements such as material certificates, design method and calculations, testing and documentation requirements.

PED classification procedure in short

  • Provide a tag (or equipment) number and optionally a name to identify the subject item
  • Indicate the type of equipment which will define one of the three table groups (1,2,3,4 or 5 or 6,7,8,9)
  • Only for the pressure accessory it is required to indicate the assessment background (volume or nominal size of pipe)
  • Select the fluid state and group, this will define the applicable table
  • Enter the maximum pressure, maximum temperature (is sometimes required for example generators), the volume (for equipment and accessories) or the nominal diameter DN (for piping and accessories)
  • The additional information is required to be selected where applicable to determine possible exceptions to the classification tables

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Pipes are standard components used in process plants. The dimensions (wall thickness) are standardized. The below figure gives the legend for the dimensions used on the Pipe Dimension page.

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Material properties are necessary for the strength calculations of components and equipment in the process industry. The material properies page on this website is only for reference and order of magnitude when using the head and shell calculation pages.

The data for the material database comes from an out-of-date listing of materials and is for demonstration purposes only. The figures from the material properties pages can not be used for actual strength calculations.

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Flanges are used on equipment for the nozzles and in piping systems. The flanges are bolted together with a gasket in between to prevent leackage. The dimensions of flanges in piping systems and also the smaller flanges on equipment are standardized. Equipment such as pressure vessels can also have so-called body flanges. These flanges are specially made for the diameter of the equipment and are designed and calculated individually.

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