flow\pressure
- Thread starter paul-uk
- Start date
thanks guys
i am glad it comes out at 5.54 as i have been offered the choice of
two p\w's first was15lpg \240bar or the other at 21lpg \ 200bar
both are honda "gx 1300"series moters.....these both are priced at over $2000 so a 18hp is out of the question at the moment.
i have asked for the specs of both rigs to e-mailed to me.
does anyone have a opinion if the 1300hp will run the 300psi \ 5.54 gpm ok.
thanks alan \matt.
tom only just read your email that you sent me on one of the boards last night...i have answered it via the board....not sure which one so many now
thanks paul.
i am glad it comes out at 5.54 as i have been offered the choice of
two p\w's first was15lpg \240bar or the other at 21lpg \ 200bar
both are honda "gx 1300"series moters.....these both are priced at over $2000 so a 18hp is out of the question at the moment.
i have asked for the specs of both rigs to e-mailed to me.
does anyone have a opinion if the 1300hp will run the 300psi \ 5.54 gpm ok.
thanks alan \matt.
tom only just read your email that you sent me on one of the boards last night...i have answered it via the board....not sure which one so many now
thanks paul.
the_GUNN_man
New member
According to my formula you will be able to get 2600 psi with a 13hp engine and a 5.5 gpm pump. I am using the following formula: PSI x GPM = ??? take ??? and divide that by 1,100 and there you have how much horsepower you need. If you already have the horespower and gpm you could use this formula to figure out what your PSI will be. HP x 1,100 = ??? then take ??? and divide it by your gpm. So with your numbers it would be 13(hp) x 1,100 = 14,300. Then 14,300 divided by 5.5(gpm) = 2600(psi). Others might have other formulas they use. I hope I helped.
Michael
New member
21 litres = 5.548 US gallons or 4.619 Imperial gallons
200 bar = 2900.75 PSI or 20,000 kPa
From Cat pump: Flow X Pressure/1460 = Electric Brake HP; EBHP is a constant figure based on the fact that there are NEMA specifications for electric motor performance.
EBHP X 1.5 = Gasoline (petrol) engine HP required. This result is based on real world experience. Therefore from your example 21l @ 200 bar would require a 16.5 hp engine to do as advertised. Your other example of 15l @ 240 bar yields a HP requirement of 14.2. Therefore neither will work as advertised on 13 hp.
Using F x P/1100 assumes an 85% total efficiency of all components from engineering THEORETICAL values and assumes every component works at rated performance, this does NOT represent real world experience. (A) 14.6 hp (B) 12.54 hp
From Giant pump: Impact force = Flow x Square root of Pressure/18.92
Water masses 1 kg/litre or 8.39#/US gallon or 10#/Imperial gallon
From your examples: (A) would have an impact force of 15.79 pounds (B) impact force of 12.36 pounds.
As you can see this is a prime example of how flow is of more cleaning value than pressure. It also unfortunately shows how people will take advantage of formulae to do what they want. Please see my post entitled Truth in Advertising...by request for more on how I personally feel about the subject.
Hope this helps? Cheers.
200 bar = 2900.75 PSI or 20,000 kPa
From Cat pump: Flow X Pressure/1460 = Electric Brake HP; EBHP is a constant figure based on the fact that there are NEMA specifications for electric motor performance.
EBHP X 1.5 = Gasoline (petrol) engine HP required. This result is based on real world experience. Therefore from your example 21l @ 200 bar would require a 16.5 hp engine to do as advertised. Your other example of 15l @ 240 bar yields a HP requirement of 14.2. Therefore neither will work as advertised on 13 hp.
Using F x P/1100 assumes an 85% total efficiency of all components from engineering THEORETICAL values and assumes every component works at rated performance, this does NOT represent real world experience. (A) 14.6 hp (B) 12.54 hp
From Giant pump: Impact force = Flow x Square root of Pressure/18.92
Water masses 1 kg/litre or 8.39#/US gallon or 10#/Imperial gallon
From your examples: (A) would have an impact force of 15.79 pounds (B) impact force of 12.36 pounds.
As you can see this is a prime example of how flow is of more cleaning value than pressure. It also unfortunately shows how people will take advantage of formulae to do what they want. Please see my post entitled Truth in Advertising...by request for more on how I personally feel about the subject.
Hope this helps? Cheers.
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michael
first thanks for the info......i have just heard off him that the pump
is manufactured by Interpump (general) complete with reduction
gearbox (1450rpm).....13 hp
and what i can roughly expect actual flow \psi from a machine like this please.
this guy is right on my doorstep, the brand he sells i wouldn't touch, i showed him the one i want to start with(northstar157820e)which is a 13 hp 15lpm\240psi he looked at the catalog and told me these were crap.....he had already told me he would not touch any p\w he had not sold as he was to busy fixing his(crap) p\w's.....to be honest i did point this lapse out to him
......so it looks like he has come up with machine similar to the northstar but is claiming a better flow rate(which i must of asked for at sometime) and he wants another £200 more for it.
sooooooo the question is michael is it the 15\240 or the 21\200 ?
ps. i will not hold you to your opinion here or in private but i would like to have it.
cheers paul.
first thanks for the info......i have just heard off him that the pump
is manufactured by Interpump (general) complete with reduction
gearbox (1450rpm).....13 hp
and what i can roughly expect actual flow \psi from a machine like this please.
this guy is right on my doorstep, the brand he sells i wouldn't touch, i showed him the one i want to start with(northstar157820e)which is a 13 hp 15lpm\240psi he looked at the catalog and told me these were crap.....he had already told me he would not touch any p\w he had not sold as he was to busy fixing his(crap) p\w's.....to be honest i did point this lapse out to him
......so it looks like he has come up with machine similar to the northstar but is claiming a better flow rate(which i must of asked for at sometime) and he wants another £200 more for it.sooooooo the question is michael is it the 15\240 or the 21\200 ?
ps. i will not hold you to your opinion here or in private
but i would like to have it.cheers paul.
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