For presentation of unit piping layout, the scale adopted usually are 1:25 or 1:331/3 (1:33.33)and 1:100 for the pipe rack. The other data required for the development of piping drawings are defined in the chapter on “Equipment and Piping Layout”. Sometimes, preliminary piping study is made to fix the equipment co-ordinates. Prior to making the piping drawings, the equipment layout drawings and plot plan are prepared and these drawings are used as the basis for developing the piping drawing. 1.0 PLAN AND ISOMETRIC PRESENTATION OF A PIPING SYSTEM The purpose of drawing is to give detailed information so that the pipelines could be fabricated and erected to satisfy the process requirements. Paper by the use of which 3D representation of the pipelines can be prepared. Specially printed isometric sheets are available with lines drawn vertically and at 30o clockwise and 30o counter-clockwise respectively from the horizontal axis of the In complex piping systems, especially within the unit/plant building where orthographic views do not illustrate the details of design fully, pictorial view in isometric presentation is drawn for clarity. Orthographic symbols are available in templates that are used for speeding up the manual drafting and also the symbol library for computer aided drafting. Most commonly used symbols are in Table 1. To represent a three plane piping in two dimensions of the paper, certain symbols are followed.

These drawings are called the General Arrangement of Piping. Isometric Views Piping layout is developed in both plan view and elevation view and section / details are added for clarity wherever necessary. There are two types of views used in the piping drawings: a) Orthographic.- Plans and Elevations b) Perspective. Piping Engineers derive basics from these to represent the pipeline routing on the drawing.

The machine drawings and the geometrical drawings are taught in the basic engineering curriculum. GOPINATH THE BASICS The drawings are always considered as the language of engineers. PIPING ENGINEERING CELL PIPING DRAWINGS T.

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