DIN 28004 PDF

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Standard [WITHDRAWN] DIN Flow sheets and diagrams of process plants – Graphical symbols. German title: Fließbilder. A Picture symbols defined by DIN , The following picture symbols are standardised by DIN 28 , part 3. Only the parts of the norm relevant. DIN – DRAFT. Draft Document – Flow diagrams of process units – Definitions. standard by Deutsches Institut Fur Normung E.V.

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As the process flow-sheet is the definitive document on the process, the presentation must be clear, comprehensive, accurate and complete.

The various types of flow-sheet are discussed below.

A block diagram is the simplest form of presentation. Each block can represent a single piece of equipment or a complete stage in the dkn.

With complex processes, their use is limited to showing the overall process. Block diagrams are useful for representing a process in a simplified form in reports and textbooks, but have only a limited use as engineering documents.

The stream flow-rates and compositions can be shown on the diagram adjacent to the stream lines, when 280004 a small amount of information is to be shown, or tabulated separately. The blocks can be of any shape, but it is usually convenient to use a mixture of squares and circles, drawn with a template.


On the detailed flow-sheets used for design and operation, the equipment is normally drawn in a stylised pictorial form. For tender documents or company brochures, actual scale drawings 2800 the equipment are sometimes used, but it is more usual to use a simplified representation. In Europe, the German standards organisation has published dim set of guide rules and symbols for flow-sheet presentation, DIN This is available in an English translation from the British Standards Institution.

The data on the flow-rate of don individual component, on the total stream flow-rate, and the percentage composition, can be shown on the flow-sheet in various ways. The simplest method, suitable for simple processes with few equipment pieces, is to tabulate the data in blocks alongside the process stream lines. Only a limited amount of information can be shown in this way, and it is difficult to make neat alterations or to add additional data.

In another method each stream line is numbered and the data tabulated at the bottom of the sheet. Alterations and additions can be easily made.

FLOW-SHEET PRESENTATION – I | Chemical Engineering Projects

This is the method generally used by professional design offices. The amount of information shown on a flow-sheet will depend on the custom and practice of the particular design office. The list given below has therefore been divided into essential items and optional items.

The essential items must always be shown, the optional items add to the usefulness of the flow-sheet but are not always included. Stream temperature, degrees Celsius preferred.


A Picture symbols defined by DIN

Nominal operating pressure the required operating pressure. Physical property data, mean values for the stream, such as: The stream physical properties are best estimated by the process engineer responsible for the flow-sheet.

If they are then shown on the flow-sheet, they are available for use by the specialist design groups responsible for the subsequent detailed design. It is best that each group use the same estimates, rather than each decide its own values.

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