 We investigated the cause of clogging and solved the problem.
Your current spray nozzle has an internal
component that stirs the liquid. This
means that the smallest free passage
diameter within the nozzle body is
half that of the orifice diameter
despite the latter being quite big.
The liquid circulating inside the
body of the spray nozzle accumulates there
because of its viscous nature, and
this is aggravated by pieces of sediment
that accelerate the build-up and completely
clog the spray nozzle within a relatively
short time. Naturally, the performance
of the spray nozzle deteriorates as soon
as this process begins to occur. The
reason the spray nozzles above the line
clog sooner than those below it is
that gravity causes the matter responsible
for the clogging to gather along the
bottom of the interior of the pipe.
It flows more easily into the upper
nozzles because they are fitted along
the underside of the pipe. As a measure
to counter clogging, you'd better
replace your current spray nozzles with
full cone nozzles that have no internal
stirring device. Please note that
this type of spray nozzle produces coarser
droplets than your current spray nozzle
and has a rather worse flow distribution,
so you need to confirm that its performance
is satisfactory before introducing
it.
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