15hp I'd imagine is with margin and for years and years and 175+psi
I think im going to throw it on and see. Worse case it's not enough and I repower.
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Champion compressor pump
- Thread starter Sumboodie
- Start date
I think im going to throw it on and see. Worse case it's not enough and I repower.
oldmachinenut
Well-known member
I had a 1978 Wayne 80 gallon vertical that also had the siphon drain in the lower 2” plug.My Champion vertical tank compressor has a siphon tube from the valve to the bottom of the tank, all internal. That makes it easy to blow water out of the tank without bending down to reach the valve. Pretty common design on Champion compressors.
No, worst case is you damage the pump because it had inadequate lubrication. The minium rpm is about keeping the splash lubrication working correctly. I understand you don't want to swap things around but if the R15 pump works, swap it over. It's a great 5hp pump.15hp I'd imagine is with margin and for years and years and 175+psi
I think im going to throw it on and see. Worse case it's not enough and I repower.
Edit: Damn phone autocorrect.
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Already 3stablished its plenty rpm wise.No, worst case is you damage the pump because it had inadequate lubrication. The minium rpm is about keeping the splash lubrication working correctly. I understand you don't want to swap things around but if the R15 pump works, swap it over. It's a great 5hp pump.
Edit: Damn phone autocorrect.
Jswain
Well-known member
The rpm might be fine but the power required to turn at that rpm might not be. If you have everything already and spin the pump within its correct rpm range it's worth a try. Maybe you can run it at a lower pressure. But what's more likely to happen is your electric motor won't have the power to turn it unless you downsize the pulley accordinglyAlready 3stablished its plenty rpm wise.
5hp is 33.33% of 15hp so you'd think the pulley would have to be 33.33% of the 9" pulley you have on the 15hp motor currently. Then you are probably out of rpm range on the pump? Also the smaller you go the less grip the belts will have etc etc.
Based on the spec sheet, that pump needs 15hp to spin at 890rpm to deliver 125 psi air. (770 for 175 psi air). The minimum pump rpm is 425. So using the 125 psi max you need 15hp*425/890=7.1hp. If you want to hit 175 psi you need 8.2hp. If you setup a 5hp motor to spin the pump even at the minimum rpm you will run out of hp before you get to 125 psi. What will likely happen is you will hit your target rpm when pressure is low but then fall behind as pressure builds. The motor simply isn't strong enough to run that pump at speeds needed to build useful pressure. If it runs slow you are likely to have a lubrication based failure.Already 3stablished its plenty rpm wise.
I need ~150psi.
R40
9" motor
22" pump
R15
16.5" pump
6" motor
1735rpm motor 5hp
Haven't found anything larger than 7.5hp in 240v single phase.
If my math is correct, they are at around 650rpm, and 6" pulley to 22" would be about 475rpm.
Mostly interested in running the 5hp since I have it and only cost is the VFD I got off Amazon.
If it's not going to work, I need to return that and try to find a ~10hp single phase motor.
Thing too is that's like 35amps, so would need some type of "soft start"
Had planned on using some #10 wire for the building but if the compressor alone uses 35 amps, I'd need #8 at least, maybe 6.
Will have a used oil boiler in the building, couple lights and maybe backup gen set.
R40
9" motor
22" pump
R15
16.5" pump
6" motor
1735rpm motor 5hp
Haven't found anything larger than 7.5hp in 240v single phase.
If my math is correct, they are at around 650rpm, and 6" pulley to 22" would be about 475rpm.
Mostly interested in running the 5hp since I have it and only cost is the VFD I got off Amazon.
If it's not going to work, I need to return that and try to find a ~10hp single phase motor.
Thing too is that's like 35amps, so would need some type of "soft start"
Had planned on using some #10 wire for the building but if the compressor alone uses 35 amps, I'd need #8 at least, maybe 6.
Will have a used oil boiler in the building, couple lights and maybe backup gen set.
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I would assume if you have a 1725RPM (is that the correct number?) 5hp motor then you will be fine if you can use the pulley off your old yellow compressor with the R15 pump. The R15 is going to pair really nicely with a 5hp motor as it's basically designed for 5-7.5 HP (I think it can work down to 3hp motors). Or if you mean to use the motor on the yellow compressor, again, great. It should work nicely. Swap the pump and motor to the newer tank. Sell the R40 and 15hp motor (you may not get much for them but hopefully enough to recoup your investment).
I would assume if you have a 1725RPM (is that the correct number?) 5hp motor then you will be fine if you can use the pulley off your old yellow compressor with the R15 pump. The R15 is going to pair really nicely with a 5hp motor as it's basically designed for 5-7.5 HP (I think it can work down to 3hp motors). Or if you mean to use the motor on the yellow compressor, again, great. It should work nicely. Swap the pump and motor to the newer tank. Sell the R40 and 15hp motor (you may not get much for them but hopefully enough to recoup your investment).
The 5hp is the one on rusty. With the r15 pump.
Just i can use the r40 output for sandblasting and it's already all setup with an aftercooler.
The r15 would take some piping and fab to setup, and only ~20cfm vs 50?
john.k
Well-known member
You might consider a gasoline engine if you only want to sandblast............ a tiny motor pulley raises issues of belt wrap ,belt flex ,and slippage
The up side here is that you have two high quality pumps and even the 5hp motor + R15 should be able to keep up with things like a blast cabinet etc. With a 7.5 hp motor I think they are typically quoting 23cfm. If you want to do big job blasting then that R40 pump is a great tool. However, you will need a 10hp motor to make it work. There is simply no way, based on the specs of the R40 pump, to have it work with a 5hp motor. You have a good box of parts to play with between the two compressors, it's just a question of how to do it.The 5hp is the one on rusty. With the r15 pump.
Just i can use the r40 output for sandblasting and it's already all setup with an aftercooler.
The r15 would take some piping and fab to setup, and only ~20cfm vs 50?
23cfm is fairly weak. My sandblaster specs 35.The up side here is that you have two high quality pumps and even the 5hp motor + R15 should be able to keep up with things like a blast cabinet etc. With a 7.5 hp motor I think they are typically quoting 23cfm. If you want to do big job blasting then that R40 pump is a great tool. However, you will need a 10hp motor to make it work. There is simply no way, based on the specs of the R40 pump, to have it work with a 5hp motor. You have a good box of parts to play with between the two compressors, it's just a question of how to do it.