How to decrease pump flow???

[therecklessengineer]

As Tony said. That 6 bar won't be with any flow - that'll be the max value.

Edit: Here's the pdf: http://www.oilybits.com/downloads/PEDROLLO-NGA-PRO-50HZ.pdf

Not 6 bar. 0.6 bar@max flow up to a maximum of 2 bar. Someone's made an oops.

Thought it sounded a bit odd. 6 bar @ 350l/min is approx 3.5kW.

[Tony]

Good find on the datasheet.  At max head (20m) it'll be pushing about 1.8 bar with bio.

[therecklessengineer]

Good find on the datasheet.  At max head (20m) it'll be pushing about 1.8 bar with bio.

Not really. It was linked at the bottom of the oilybits page. 

[Tony]

Oh yes, so it is 

[Bio-boy]

Thats good I think?!?! So what should the flow rate be at zero head with bio? At least it shouldn't destroy my filters.

[therecklessengineer]

Theoretically, zero bar. To put a number on it you'd have to know the flow restriction of the filter and the pipework.

I guess it'd probably sit about 1 bar ish. You won't get more than 2 bar out of the pump.

[knighty]

had a couple of drinks... but last few posts are confusing me

1 bar is 10m of head (close enough to 10 anyway)

pump does 20m head at most, so max pressure out of the pump is about 2 bar (about 30psi)

at that head, the flow (with water) is 50l/min

that's the max head, so even if you restrict the flow more, the pressure won't increase any more


pressure when filtering will depend on how restrictive the filters are, but should still max out at 35psi



the less pressure you have at your filters the better tho... less chance of pushing crap through them

[therecklessengineer]

had a couple of drinks... but last few posts are confusing me

1 bar is 10m of head (close enough to 10 anyway)

pump does 20m head at most, so max pressure out of the pump is about 2 bar (about 30psi)

at that head, the flow (with water) is 50l/min

that's the max head, so even if you restrict the flow more, the pressure won't increase any more


pressure when filtering will depend on how restrictive the filters are, but should still max out at 35psi



the less pressure you have at your filters the better tho... less chance of pushing crap through them

Bang on.