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[pdender]

I am simulating a valve expansion with the multiphase VLSH option in Prode Properties which includes solids and hydrate, the problem is that the standard hydrate model in Prode is limited to 220-310 K temperature range and the flash operation predicts a temperature lower than 220 K,

any suggestions ?

[PaoloPemi]

yes, the standard hydrate model in Prode Properties is limited to 220-310 K temperature range as reported in operating manual,

if you wish to go outside that range ask for the complex model (slower but more accurate at low temperatures),

anyway I think you can manage the problem in most cases even with standard model,

if you wish to model the valve setting Hout = Hin the HP-VLSH flash works for tout in the range 220-310 K

while the HP-VLS flash of course works outside that range,

for example, if you set as model for solids SPM-CPA you may solve a HP-VLS flash and then evaluate formation of hydrates at final temperature...