SIMULATION OF TRANSIENT HYDRAULIC BEHAVIO R PROCESS ENGINEERING-PLANTWITH LONG PIPES

Citation
E. Raschke et al., SIMULATION OF TRANSIENT HYDRAULIC BEHAVIO R PROCESS ENGINEERING-PLANTWITH LONG PIPES, Chemieingenieurtechnik, 66(5), 1994, pp. 652-660
Citations number
10
Categorie Soggetti
Engineering, Chemical
Journal title
ISSN journal
0009286X
Volume
66
Issue
5
Year of publication
1994
Pages
652 - 660
Database
ISI
SICI code
0009-286X(1994)66:5<652:SOTHBR>2.0.ZU;2-7
Abstract
A knowledge of transient flow processes is becoming increasingly impor tant for the reliable design and control of process engineering plant. Transient flow processes occur, of example, in long liquid-carrying p ipes: on start-up and shut-down of plant, in emergency shut-downs and fast closure, i.e. when liquid is rapidly decelerated or accelerated. The consequence of such an event is a hammer effect, i.e. a short, oft en violent change of pressure placing considerable stress on structure s. Such hammer effects are readily calculated by numerical methods in single phase media. Technical devices for prevention of inadmissibly h igh pressure surges can also be designed by means of simulation calcul ations. However, hammer effects also occur by sudden condensation of v apours. A number of systems in which condensation hammer effects can o ccur are considered at the end of this contribution. Two special dampi ng measures are presented.