The pump, being a positive displacement gear pump, will pretty much reach any pressure required to move your fluid UP TO THE POINT that either it runs out of the power required to do so, breaks down, explodes, or blows up your piping.  It is rated for continuous duty up to 500 psi, so as long as your piping system does not have a pressure loss of around 500 psi at your required flowrate, it will get it on.Highly viscous oils are likely to be somewhat non-Newtonian and may require a high pressure to get moving with a lower pressure required afterwards to keep it moving, or if you keep the same high pressure, your flowrate will increase, and this pump will reach much higher pressures for short spikes, so there is also some good capacity for that if needed, once again, provided your pipe is rated for those pressure spikes too.  I didn't notice if it has an internal pressure relief valve, so be sure your piping is protected from possible overpressures that may develope, should some downstream valve become closed, or flow otherwise gumed up.  
You've just raised about a month's worth of questions.To simply greatly, a gear pump will pump a particular volume at a particular speed; the discharge pressure will be whatever is required to move that volume through the piping.  The pump is going to keep trying to push that volume until it moves or something breaks.  So, in order to vary the flow rate over such a side range, the Self-priming pumps speed will likely have to be varied.Viscosity will have a definite effect on the pump, though; to some extent, the lower the viscosity, the more 'slip' you will get (leakage back to suction around the gears).  So the higher the viscosity, the less slippage, although this tends to be a fairly small figure.

2011-08-08

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