I doubt it's 50% each, that doesn't make sense. It would be more like 100 psi each. Like going from SISO to MIMO is 3db.
On Tue, May 23, 2023 at 1:47 PM Steve Jones <thatoneguyst...@gmail.com> wrote: > 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 >> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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