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andyb
Senior Member
United Kingdom
472 Posts |
 Posted - 30 Jul 2009 : 22:51:39
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I have had an interesting discussion with a Pesticides application instructor tonight regarding setting up a National Proficiency Testing Council (NPTC) PA1 and PA6 training session, during the discussion we spoke about the type of nozzles Pesters use for applying insecticide, he was surprised to hear that we use standard flat fan, he suggested we should be using Even flat fan nozzles. Our standard nozzle delivers twice the amount of solution in the middle half of the fan than the two outer areas, he indicated that if we were using the edge (or near to the edge) of the spray at the wall to floor joint we would actually be under spraying the target areas and only delivering the correct dosage away from the wall. The flat fan is designed to be used as an overlap ie. 50% in the centre and 25% at either side of the spray pattern, allowing the overlap (2x25%) to be equal to the main part of the spray pattern, how often do we need the pattern to overlap? An even flat fan delivers the same amount across the spray so would make more sense for us to use. Would the suppliers explain to us why we use flat fan nozzles and not even fans?
ANDY B
www.abcomplete.co.uk |
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ABPest
Senior Member
United Kingdom
450 Posts |
Posted - 31 Jul 2009 : 07:58:27
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Mmmmmmm interesting!
If you think of an angle, wall floor for eg then hold a flat fan nozzle equidistant from the actual angle, the edges of the fan spray pattern will reach the wall and floor before the middle bit of the fan spray pattern hits the crack! The edge of the fan will therefor be more narrow, hence more spray in a smaller area ( of the edge of fan ).
So overeall the flat fan would just have a reduced width!
The opposite would be for the even fan.
Any one understand this?  Draw an angle on a piece of paper and draw a fan shape spraying into the angle to see what I mean.
Then again, I'm no scientist 
Adrian. |
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Tomo
Senior Member
United Kingdom
246 Posts |
Posted - 01 Aug 2009 : 18:06:30
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Well done Adrian! This was explained to me on my RSH course (instructed by Ed Allan)as you say in you eloquent way the corner/wall floor junction is farther away than the two points (wall and floor) at the edge of the fan reach therefore this compensates automatically, so you are dead right on this one (therefore we are using the right tips). About time we found something we can agree on.
Aint it just a shame I cant award karma on this site, lol
Regard's Tomo |
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andyb
Senior Member
United Kingdom
472 Posts |
Posted - 02 Aug 2009 : 22:59:49
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"Would the suppliers explain to us why we use flat fan nozzles and not even fans?" The question came from a Government approved instructor, it was a genuine "Why do you use a nozzle that is designed for horticulture flat area where overlap is desired, the ideal nozzle for your type of application would be even van." Ideally I would like to hear it from the horses mouth.
ANDY B
www.abcomplete.co.uk |
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Iain
Moderator
United Kingdom
756 Posts |
Posted - 03 Aug 2009 : 07:43:23
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When you do a treatment for fleas, you will be applying the insecticde in bands, slightly overlapping at the edges, as it suggests on the Ficam W label. Best nozzle would then be the flat fan.
The 'wall-floor' spraying scenario has already been explained by Adrian. Best nozzle would then be the flat fan.
In fact, just about any application of insectide spray in our type of work, other than crack and crevice applications, would best be done with overlapping bands - using a flat fan nozzle.
What situations do you feel another nozzle would be better? |
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nigel
Hyperactive Member
803 Posts |
Posted - 03 Aug 2009 : 08:41:19
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| Plus there is no way on earth you would get a tractor around the furniture in a living room |
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The Spotlight Kid
Moderator
1474 Posts |
Posted - 03 Aug 2009 : 09:05:35
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| I beg to differ Nigel. The Dinky Massey Harris (No A933) would have no trouble circumnavigating any domestic furniture whilst performing accurate spraying of the carpets for a wide range of pests. |
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andyb
Senior Member
United Kingdom
472 Posts |
Posted - 03 Aug 2009 : 17:03:56
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I am happy with the nozzles that I use, it was Chris (you met him on the pesticides application day) that has made the suggestion we should be using even fan nozzles..
ANDY B
www.abcomplete.co.uk |
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Dusty
Hyperactive Member
Australia
970 Posts |
Posted - 07 Aug 2009 : 07:11:17
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Interesting.
What application rates are suggested on labels?
Do you conduct volume/time application tests on various set ups?
JAFA
Don't feed them, get Rid of them - visit us on www.ridpest.com.au
or blog us on http://blog.ridpest.com.au |
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Flat fan nozzles.
