Mechanical Design of Process Equipment

13.1. INTRODUCTION Mechanical design of chemical plant particular interest to chemical engineers developing and specifying the basic design information will be responsible for Mechanical design of chemical plant pressure vessels storage tanks heat-exchanger Vessel function. Process materials and services. Operating and design temperature and pressure. Materials of construction. Vessel dimensions and orientation. Type of vessel heads to be used. Openings and connections required. Specification of heating and cooling jackets or coils. Type of agitator. Specification of internal fittings. data sheet for pressure vessel design

13.1.1. Classification of pressure vessels Pressure vessels are sub-divided into two classes depending on the ratio of the wall thickness to vessel diameter: thin-walled vessels, with a thickness ratio of less than 1 : 10; and thick-walled vessels, above this ratio If the wall is thin, the radial stress 3 will be small and can be neglected in comparison with the other stresses, and the longitudinal and circumferential stresses 1 and 2 can be taken as constant over the wall thickness. In a thick wall, the magnitude of the radial stress will be significant, and the circumferential stress will vary across the wall.

Piping & Instrumentation Diagram

Data sheet for pressure vessel design Sufficient for the chemical engineer to check the feasibility of a proposed equipment design to estimate the vessel cost for an economic analysis to determine the vessel’s general proportions and weight for plant layout purposes

13.2. PRESSURE VESSEL CODES AND STANDARDS British Standard PD 5500 European Standard EN 13445 American Society of Mechanical Engineers code Section VIII (the ASME code) Design materials of construction fabrication (manufacture and workmanship) inspection and testing The current (2003) edition of PD 5500 covers vessels fabricated in carbon and alloy steels, and aluminium The design of vessels constructed from reinforced plastics is covered by BS 4994 The ASME code covers steels, non-ferrous metals, and fibre- reinforced plastics

TERIMA KASIH