Although it is potentially a high pressure pump, it was only ever going to be pumping into an open ended pipe. So the discharge pressure of the pump is limited to a the head and frictional losses. As the flow rate would be relatively low, I considered the frictional losses negligible.
To be double sure I didn't overstress the new oil line (Qualpipe), I fitted a section of rubber fuel pipe on the pump discharge so I could 'feel' how much pressure I was putting down the line - turns out - next to nothing.
I had the existing pipework from the old tank to a T piece. One leg went to the boiler, the other leg, via a ball-valve, through the pump to the new tank. Originally I planned to either run the boiler, or send oil to the new tank not both.
But when I tried it, they both worked simultaneously. Happy days.
Wasn't a fast fill rate so just let it run. Took about 20 hrs to transfer 2000+ litres.
Once the new tank was full, I made off the top outlet connection and disconnected the old oil line.
I also used the pump to blow out oil from the old line back to the tank so it was left empty.
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One thing I have noticed is - the bowl on my Tigerloop used to run nearly full, now its nearly empty.
No bubbles to be seen so its not a leak. I suppose its because the burner now has to pull at least 300mbar to overcome the Atkinson anti-siphon valve on the top outlet tank.
Doesn't seem to affect the burner operation though I have still to get my gauges on it and the FGA.
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You might also notice that in my original post, I said I had 1000 litres to transfer, yet I ended up transferring 2000+ litres.
So... how could this be?
Could it be that, while running the tank down to minimum, I forgot to cancel my regular oil delivery service???
Who would be so stupid???