Gasohol

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.]


--
A host is a host from coast to
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

"David Lesher" wrote
Some lines actually used spheres between, but they bring their own
problems...

A little further OT,... I've watched a lot of heavy #6 (needs to be heated
to pump) unloaded at the offshore platform. When the tanker is empty, we pig
the pipe and backfill with #2. The methods seem crude to the observer, but
the results are exact enough even for the accountants.

"Mike Isaksen" wrote

A little further OT,... I've watched a lot of heavy #6 (needs to be heated
to pump) unloaded at the offshore platform. When the tanker is empty, we
pig the pipe and backfill with #2. The methods seem crude to the observer,
but the results are exact enough even for the accountants.

Care to explain a little more, for the unfamiliar among us?

Pig the pipe?

Backfill with #2? What is that?

Why is it possible to be considered as crude, and why is it accurate?
--
Jim in NC

He may cut early. middle or late; it depends on the two products. The
schedulers try to make adjacent 'tenders' friendly.

Interesting post. Thanks Dave

Paul
N1431A
KPLU