Dajani It depends. If it is a heat exchanger design where steam (saturated steam) condenses then design for full vacuum is preferable. If it is surface condenser type, which is normally used with supersaturated steam for steam turbines, then partial vacuum is preferable. Suggest go through TEMA depending on the type of steam used (saturated or supersaturated at higher pressures) and the type of heat exchanger design for shell and tube side. Trust this helps you C.V.Srinivasan Nishi Engineers Pvt Ltd India May 02, 2007 E-mail: nishi@vsnl.com >Hello; > >What is the steam out condition for heat exchangers? What >is the design considerations? Do we need to design for full >or half vacuum? > >Thanks.