Technical Drawings and their Types...

Technical Drawings and their Types Technical drawings are also known as ‘engineering drawings’. They are means of communications and convey technical information of plant and equipment. They describe three-dimensional objects through the medium of two-dimensional paper. The process of producing technical drawings, and the skill of producing those, is often referred to as ‘drafting’. Technical drawing is normally accepted as legal document and is frequently being used for regulatory approvals. Technical drawings are most frequently used to establish engineering requirements. They describe typical applications and minimum content requirements. They are standardized tools of graphical language which avoid verbal exchanges. They are used and understood by the technical personnel speaking different languages and belonging to different countries and cultures. Technical drawings are prepared in such a way that they convey complete information of the plant and equipment clearly and concisely. They often contain more than just a graphic representation of the subject. They also contain dimensions, notes and specifications. Clarity is the essential aspect of the technical drawings. They normally represent two dimension view of the object though some drawings also provide three dimensional views. They are prepared either manually or with the aid of computer. They are generally prepared or printed in standard size of paper. Except a few category of drawings (e.g. process flow diagrams, control diagrams, piping and instruments diagrams, and single line diagrams etc.), all the drawings are normally prepared in plan and different section views usually to the scale in order to provide complete information of the drawing object. Often help of standardized symbols are taken in the drawing for depicting certain equipments or instruments. Those informations which cannot be given in the plan and sections view such as material specification, tolerances, and bill of materials etc. are normally given in a...