RE: [compost_tea] Pressure & critters

From: Robert Norsen <bnbrew_at_yahoo.com>
Date: Fri, 25 Jul 2003 16:50:06 -0700 (PDT)

Mike and All I've been trying to say this for a while. Large cross section pipes allow the little ones to travel slowely even under high pressure. Transition into a smooth small diameter hose. 1/'2" or 3/'8" The 'gun should be selected to have largest possible innards so the velocity is low. Finally the jet. The jet can be a straight ahead open hole. cut accross the hole is a vee cut that allows the pressure to escape to form a flat fan shaped spray. No sharp turns except that last one. Lower pressure will slow the impact during this last part of the trip.
 
But the spray operator is going to want to have choices of spray shape. Dont know how to handle that.
 
I'm with you Mike Hitting the leaf seems like the nost gentle part of the trip. Bob
 
 
Mike Bosko <mjbosko_at_jmtsystems.com> wrote:


v\:* {behavior:url(#default#VML);}o\:* {behavior:url(#default#VML);}w\:* {behavior:url(#default#VML);}.shape {behavior:url(#default#VML);}
Seems to me that they’re getting splatted against things immediately before leaving the sprayer –that’s how the sprayer works. Pressure builds up in the tank, and then the water hits a fitting at the end of the hose connecter that in turn, makes the spray fan out and maintain pressure. I can’t imagine how that could be any better than flying through the air for a while and then hitting a plant – even if it were a jet stream, it seems better than what the sprayer nozzle does to them little critters.

 

Maybe I’m thinking about this too much again, I don’t know.

 

-m

 

-----Original Message-----
From: Jeff Lowenfels [mailto:jeff_at_gardener.com]
Sent: Friday, July 25, 2003 2:32 PM
To: compost_tea_at_yahoogroups.com
Subject: Re: [compost_tea] Pressure & critters

 

Pressures up to 70 PSI are what you can expect from a pump sprayer. This is fine for the microbes. The problem is the velocity at which they hit things. That is where you need to be most careful. Splatted microbes are dead ones....Spraying is an art.

 

Cheers,

 

Jeff




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Received on Sat Jul 26 2003 - 00:37:31 EDT

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