I dont know the math behind air pressure, but if I split the 150psi into two, then does each orifice get 75psi?
On Tue, May 23, 2023 at 9:54 AM Chuck McCown via AF <af@af.afmug.com> wrote: > Spoke to a venturi engineer just now. He says 72 psi is the magic > number. It has something to do with atmospheric air pressure and the > density of the air. I presume that number would change with altitude. > > > > *From:* Steve Jones > *Sent:* Monday, May 22, 2023 9:34 AM > *To:* AnimalFarm Microwave Users Group > *Subject:* Re: [AFMUG] Air vac > > I use an auger to dig them, vac to clear them. Same thing with the > airspade/airvac combo. I dont do posts less than 48 inches. Whats really > pushing this is the last project was installing 2 inch duct for the power > company, the old primaries were failed concentric, as it turns out the > stuff is dangerous, it faults on its own, jabbing shovels and post hole > diggers at it is a recipe for disaster and water is its mortal enemy. Im > chasing more contracts with that power company to replace more of that > concentric. Im not gonna get the cutting power of water, but ill have dry > spoils to put back in the hole. > > I wish I hadnt done all the drugs, id be able to understand the maths on > this, im wondering if I cant split the input and double the lift with two > venturis > > On Mon, May 22, 2023 at 9:23 AM <dmmoff...@gmail.com> wrote: > >> So you dug post holes with a shop vac? Is it sandy where you are? I >> feel like I hit about 10,000 rocks per post hole. Many too big for a vac >> hose, and many just big enough to clog it. >> >> I might have to try it anyway. >> >> >> >> *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Steve Jones >> *Sent:* Sunday, May 21, 2023 6:12 PM >> *To:* AnimalFarm Microwave Users Group <af@af.afmug.com> >> *Subject:* Re: [AFMUG] Air vac >> >> >> >> I'm having better luck with the prototype than a shop vac already, just >> trying to improve the lift. Toting a generator isnt really an option. >> >> I also just have a shop vac hose, if theres moisture the dirt collects on >> the sides with a shop vac and loses lift. That's how I've always dug post >> holes. >> >> On Sun, May 21, 2023, 3:53 PM Chuck McCown via AF <af@af.afmug.com> >> wrote: >> >> I think you would have better luck with a strong shop vac and a 30 gallon >> drum. I have seen guys do that and it worked OK. Air powered vacuum >> producers work but I don’t know how well. Sometimes they are called >> eductors or ejectors. >> >> >> >> Take a look at this one: >> >> >> https://www.globalindustrial.com/p/2-in-line-vac-only-aluminum?infoParam.campaignId=T9F&gclid=CjwKCAjwgqejBhBAEiwAuWHioM68tuz0PVLcvHFy4CRspRtvhy5gEQQryMrUkOoNv4MVeUTRSWTkvxoCrv8QAvD_BwE >> >> >> >> Best Regards, >> Chuck McCown >> >> McCown Technology Corporation >> 8401 N Commerce Dr >> Lake Point, Utah 84074 >> 801-250-9503 Office >> 435-830-4306 Cell >> www.mccowntech.com >> www.microtrench.pro >> www.terabitnetworks.com >> >> >> >> *From:* Steve Jones >> >> *Sent:* Sunday, May 21, 2023 11:56 AM >> >> *To:* AnimalFarm Microwave Users Group >> >> *Subject:* [AFMUG] Air vac >> >> >> >> I need advice from you nerds. >> >> I'm a broke joke, so hydrovac isnt in my budget. Besides, I want dry >> spoils to put back in the hole. >> >> This revision works for venturi. I have multiple size reducer but right >> now I'm just doing 3/4 to to inch. The 3/4 to 1 then 1 to half back to 1.5 >> for the venturi side seemed to have the best lift, but the hardware store >> didnt have everything, so it's all in 2 inch right now >> >> I'll dump to a 2000lb peanut sack if I can find one, but for now I'll >> just use a 30 gallon drum and dump on the mega movers. >> >> >> >> This is for use in conjunction with the airspade I did have some coin to >> get. >> >> >> >> Venturi math gets complicated and I'm full retard so I need to find he >> best ways to increase negative pressure and where to drill the ports. >> >> >> >> I also wonder if theres an option to recapture the exhaust into the >> airspade. >> >> >> >> I need you nerds to go full geek. >> >> >> >> If I can get valves correct I'll have the local machinist make me a >> couple that are pressure rated. >> >> >> >> This is to mimic the airvac I also cant afford. >> >> >> >> This proof of concept has the lift to clear potholes and handholes, but >> I need to clean it up and get more efficiency. >> >> A side discovery is that this setup is perfect for blowing straw and seed >> with glue >> ------------------------------ >> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > ------------------------------ > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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