svp07 14 Report post Posted June 4, 2004 My machine is 4/3500. How do I calculate the decrease in pressure for each nozzle I go up to decrease the pressure and keep the flow rate? If I use a 40 degree #4 tip and double the tip size to #8 at 40 degrees what does the pressure drop to? Thanks for the help, Steve Omege Power Washing, LLC "The end of the Dirt!" Share this post Link to post Share on other sites
0 Mike Williamson 198 Report post Posted June 4, 2004 Try this...Keep a copy on your rig. The Angle of the tip doesn't affect the psi coming out of the nozzle. Share this post Link to post Share on other sites
0 svp07 14 Report post Posted June 5, 2004 Mike, Thanks for the chart, ,but what do the numbers under the 3500 psi mean ex. #8 is a 7.5 , what does that mean? Steve Share this post Link to post Share on other sites
0 Firedkm 14 Report post Posted June 5, 2004 Steve,Since you have a 4 gallon machine and you want to change your pressure to 1000 psi. goto the 1000psi column and follow it down till you see 4.0 ( thats gallons per minute) Then look to the left side and see what size tip you need. In this case you would need a #8 nozzle to drop your pressure to 1000 psi Share this post Link to post Share on other sites
0 svp07 14 Report post Posted June 5, 2004 thanks Dale, I appreciate it. I'm still jealous about you have access to 12% S/H in southern NJ....I'm still looking. Steve Share this post Link to post Share on other sites
0 Aplus 525 Report post Posted June 6, 2004 Try this...Keep a copy on your rig.The Angle of the tip doesn't affect the psi coming out of the nozzle. But it does affect the pressure as it dissipates quicker. By this I mean the distance you are from the surface to be washed. A 15 degree nozzle will still have more psi at say 6" than a 40 degree nozzle would. Share this post Link to post Share on other sites
0 Mike Williamson 198 Report post Posted June 6, 2004 Tony: Right, I agree. I was simply talking about the psi as it leaves the nozzle. Share this post Link to post Share on other sites
0 svp07 14 Report post Posted June 7, 2004 Does anyone know the per inch pressure decrease moving away from the nozzle? just thought I'd throw it out there. Steve Share this post Link to post Share on other sites
0 Mike Williamson 198 Report post Posted June 7, 2004 Interesting question...I wonder if anyone has any formulas for this... Share this post Link to post Share on other sites
0 One Tough Pressure 580 Report post Posted June 7, 2004 It is in the back of the Dultmeier catalog. http://www.dultmeier.com/pdfs/tech-library/C_Nozzle.pdf Scroll down to Nozzle Pattern Chart. Share this post Link to post Share on other sites
0 Jon 533 Report post Posted June 7, 2004 Call the below which is closet to you or go to web site, link below and ask for a catalog. Nebraska: Dultmeier Sales 13808 Industrial Road Omaha, NE 68137 Local Phone: (402) 333-1444 Nationwide: 1-800-228-9666 Fax: 1-402-333-5546 Iowa: Dultmeier Sales 601 West 76th Street Davenport, IA 52806 Local Phone: (563) 386-0930 Nationwide: 1-800-553-6975 Fax: 1-563-386-5448 http://www.dultmeier.com/about.asp Share this post Link to post Share on other sites
0 Mike Williamson 198 Report post Posted June 7, 2004 That chart doesn't answer the question...It gives the size of the spray pattern at a given distance from the surface, but doesn't give any information about how much psi is lost at a given distance...If I have a 25 degree tip that gives me 3000 psi at the nozzle, how much psi is actually hitting the surface of whatever I'm cleaning if I hold the wand, say, 8" away from the surface? How much psi is lost? That'd be a good thing to know... For example, I clean roofs, and I rinse with a 25 degree size 10 tip, which gives me approximately 1200 psi at the nozzle, which is way too much for a roof. However, the nozzle is kept 12 inches or more from the surface of the roof.....I know I'm not anywhere close to 1200psi hitting the roof...I'd guess 500 psi or less...But it would be nice to know exactly what it is. Share this post Link to post Share on other sites
0 svp07 14 Report post Posted June 7, 2004 Is this the first time this has been discussed here? Steve Share this post Link to post Share on other sites
0 Mike Williamson 198 Report post Posted June 7, 2004 First time I've seen it, but it is possible someone has brought it up before. Share this post Link to post Share on other sites
0 paul-uk 500 Report post Posted June 7, 2004 it has been a thread in the past...which board i'm not sure.....but people put what ever nozzle they like to use and go by instinct\experience.....start further away and go closer to the surface till your happy.... Share this post Link to post Share on other sites
0 Aplus 525 Report post Posted June 8, 2004 I use a dual lance exclusively. I like the fingertip control that it provides for adjusting psi. Share this post Link to post Share on other sites
My machine is 4/3500. How do I calculate the decrease in pressure for each nozzle I go up to decrease the pressure and keep the flow rate? If I use a 40 degree #4 tip and double the tip size to #8 at 40 degrees what does the pressure drop to?
Thanks for the help,
Steve
Omege Power Washing, LLC
"The end of the Dirt!"
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