"Dan Merkel" <danmerkel@[EMAIL PROTECTED]
> wrote in message
news:bC59k.6384$L_.3767@[EMAIL PROTECTED]
"Wolf Kirchmeir" <wolfkir@[EMAIL PROTECTED]
> wrote in message
news:48643d35$0$26012$9a6e19ea@[EMAIL PROTECTED]
> Len wrote:
> [...]
>> I never got a good explanation why, but several materials were
>> actually loaded through the 'discharge' valve on the bottom of the
>> car. The air in the car vented out through a pipe on the top as it
>> filled. It was your job if you overfilled and blew material out the
>> top.
>>
>> Len
>>
>
> I suspect it was to reduce venting of gases. In you fill through the top
> valve, then gases from the fluid will mix with the air being displaced
and
> vented outside the tank.
>
> --
> wolf k.
I'm not sure how tank cars are filled, but it may be that filling from the
bottom also minimized the disturbance of the material being loaded. If
you
use a hose to fill a water bucket, as the water shoots into the bucket
from
above, the water is stirred considerably and makes a lot of bubbles, etc.
If you submerge the end of the hose. the water is still agititated but not
nearly as much.
Like I said, just a thought as I really don't know how it is done...
dlm
~~~~~~~
Also, filling from the bottom, with less agitation of the product, can
reduce static electricity buildup and va****ization of the liquid. Note
that
large aircraft are fueled from the bottom. It's not just for the
convenience of the workers.
Val
|
