"Juan Jimenez" writes:



The lead in the 100LL fuel will kill you just as miserably. That's why it
can't be transported through the nationwide fuel pipeline system, and why
oil from aircraft that fly on 100LL cannot be recycled like automotive oil,
for example.

Horsefeathers.

I worked on a products pipeline eons ago...

Leaded gas was sent by pipeline for years. Still is, elsewhere.

100LL is not sent by pipeline because the quantities involved are
so tiny, they can't be economically carried. Plus, there's a testing
issue.

A products pipeline [vice crude] carries "tenders" -- a quantity of
Product B, pushing Product A ahead of it, and followed by Product
C. The only thing separating them is paperwork...

Separation ("a cut") is made by an operator at a sink in an isolated
shack with a running sample of the line output going into an
overflowing hydrometer. (This 'shack' is well within the NO SMOKING
zone...)

Each tender is (at a minimum...) say 2 hours long & more likely 10
hours. As long as the line is kept tight (i.e. under pressure as
its running..) the "interface mix" between A&B or B&C is quite small
AS COMPARED TO THE TENDER. But if the tender were 15 minutes worth,
then...

The fate of the interface mix (old term - 'slop') depends on the
two products. If you have premium gas as A, and regular as B; then
the operator cuts from the A tankage to B as soon as {s}she see the
color or specific gravity change. Other cuts are made mid-way...
[such as a regular gas [Sun] to regular gas [Shell] and such.

On some combinations, you cut to the slop tank ASAP, and only once
it's stable the new product, is it put into tank B. That's
oh JetA to gasoline.

The slop, inc. the sample sink drain, is slowly injected into #2
Fuel Oil as it arrives. It's refined to have a (say) 130F flashpoint,
and gets the slop injected as it's received, lowering the flash to
NLT 110F. [You have say 500 gallons of slop to mix in, and 500,000
gallons of #2 arriving... you can see why it works...]

With 100LL, there's no way you'll EVER have a viable tender size.
Take a small line, 6". I recall its rate was [click click] 21000
gallons an hour. Who want 50,000 gallons of 100LL today? Plus, with
no leaded {auto} regular around, the slop would all go into injection,
a PITA. [With gasoline, you'd always err by dumping better gas
[premium] into the regular...]

And there's no good way to test the tanked 100LL; you'd have to send
samples to a lab before releasing it, I bet. [The JetA was sequestered
until the lab gave the thumbs-up on 16 tests...but we shipped just
shy of half a million gallons a day of it...]

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