Hi all,
when I am performing a design(simulator based) for scaling up an existing plant(which consists of columns, vessels, exchangers etc.) to enhance capacity, the sizes of various processing equipment are bound to get bigger. So a turndown check need to be performed to know how low of a feed the plant can take. For columns, this mean sometimes we might have to work with vendors like say Sulzer, to know the turndown ratios of columns based on distributor specifications etc. But even before I get there, I want to know what sort of equipment do you need to perform turndown checks besides columns(they are expensive and constitute major equipment) and are there any typical turndown ratios for processing equipment such as below?
1. shell and tube thermosyphon reboilers
2. kettle reboilers
3. decanters
4. flash vessels
5. pumps
for instance are there any type of equipment for which I need not unduly worry about a 50% turndown? i.e equipment that are known to turndown well? for instance, maybe storage vessels or reflux drums.
if there are any resources/links that point to turndown ratios(typical) of processing equipment, that would be helpful also.
please let know your thoughts