Magic Pressure Rise

Presented at AGM & Technical Meeting, 23 November 2017 at Hilton London Paddington Hotel, London by Chris Flower and Adam Wills, ABB Consulting
The popularity of simulation software packages has made obtaining physical properties and compositions for pressure relief calculations into a relatively simple procedure. However, all too often, no consideration is given as to why a pressure increase is occurring in the system, resulting in a stream being ‘magically’ raised in pressure to match the relief conditions. Consequently, other effects such as vapour/liquid equilibrium, which can be very sensitive to pressure, are not modelled, introducing potentially significant errors into further calculations. This paper looks at the impact of modelling magical pressure rises, and discusses how simulation software can be used to avoid them.
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