may2022 - 27

" The EI 1583 specification that came
out many, many years ago, probably
about over 40 years ago, was a filter
design that used a media that trapped
absorbed water and would not let it pass
through. And this CDFX cartridge water
barrier filter does not absorb water.
It repels water. So any water that's in
the influence side of the aviation fuel
will be repelled and collected at the
bottom of the filter vessel, as opposed
to being absorbed into the filter cartridges, "
describes Robert Guglielmi,
business development manager, global,
Parker Velcon.
The water barrier filters are the same
size as the existing filter and it fits into
the filter housing the same way. There's
no requirement to do anything differently
to the filter housing. Guglielmi
describes them as " plug and play, " with
the only difference being how they repel
instead of absorb water.
However, that distinction means
the new filters are somewhat different
operationally.
" You need to do water checks every
day to make sure if any water has been
stripped away, that it is removed from
the bottom of the filter vessel. And also,
the differential pressure recording that
operators have to do daily for all fuelings
is slightly different, " Guglielmi says.
A Velcon monitor
filter vessel.
The change to differential pressure
(DP) is the most significant change that
the new filters bring to everyday fueling
operations. With SAP filters, spikes in DP
were cause for alarm, but not so much
with water barrier filters.
" Historically with any filtration
technology, differential pressure should
only ever increase under the same flow
rate, right? If you have a ... [jump] in DP
under the same flow rate, historically
that's a giant red flag that something has
gone on, that fuel is bypassing the filter, "
Berry explains. " With the water barriers
though, because of the way they work,
they don't absorb water. So, with that,
if you had a slug of water come through
and you had a spike in DP and then you
drain that water off and the DP normalized,
then that's acceptable. "
" There may be at times where it is
stripping water, " adds Guglielmi. " The
differential pressure will increase. And
when that water is removed, the differential
pressure could slightly decrease
back to a lower pressure. And that's not
any concern for alarm because it does a
different application than the older monitor
operation. "
However, drops in DP are still a red
flag and need to be addressed.
" Now you still need to be concerned
if you go from, say, five [DP] to zero. That
still means that something's ruptured or
come unseated, " Berry says.
No Mix Ups
Outside of the difference to recording
DP, the other main consideration with
the water barrier filters is not confusing
them with the SAP filters that are
being phased out, as the two filters look
nearly identical.
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may2022

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