Hello, I’ve got a (in my opinion) difficult relief case in which I hopefully can get some assistance.
The case is as follow:
A storage vessel of 4.5m3 contains water 2.3m3 water at 1.5 barg and 127.6°C. The water is pumped in a loop and is fed back again to the vessel. Heat losses are compensated with an external heater in the return of the loop.
The vessel is equipped with a rupture disc (43mm opening diameter) which vents to an atmospheric safe location via a 4mtr long 44.3mm internal diameter line. In case the heater will heat to much the rupture disc breaks at 3.0 barg (144°C) and the pump stops pumping and heater stops heating. So, no new heat input to the vessel is provided. Theoretically the rupture disc must be able to handle the amount of flash steam being generated… Question is, how can I calculate the amount of flash steam being produced per second (kg/s) and if the rupture disc is appropriate for the system? In my opinion the dynamic system needs simulation to give an answer or can I make some assumption and do a rough hand calculation and prove whether or not the disc is correct sized?
Thanks in advance for tips and hints!!!