Jose writes:


Is there no diffusion at the boundaries?


There is some. How much is complex. It depends on what the two products
are, the rate, and a big issue, is the line kept tight?

By tight I mean, was it running non-stop at the same backpressure the
whole time? If the line went up & down in rate because they added pumps
or swung to a different tank, then there is a longer [time] or broader
[linear feet of product] mix region.

Some lines actually used spheres between, but they bring their own
problems...

For a real mess; picture a midline booster pump, only used for some
products. You must keep track of what product is now in the booster
station line section before you restart. No fair dumping Diesel or Kero
into the gas going by.... but the opposite is OK. [Too much gas in the
distillate is Not Allowed, but a bbl or 3 in a 100,000 bbl tank is no big
deal.]


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