Used irrigation value???

Irrigation- Its a valley, center pivot, supposed to be all galvenized, towable unit, high presssure system, 2 towers with overhang and gun, tires all good, seems to work fine, believe was updated about 10 years ago. I belive a NEW one would run about $60/ foot. I have been told it should be worth about 25% of new cost, high pressure, toawables of this size are supposed to be in low demand. Please if some one could give me and idea what I should offer for these 2 packages, I'd be grateful.

I doubt that a 10HP pump will put out 500GPM at the 40 + psi most likely required at the nozzles. More than likely it'll put out around 180 gpm at 150 foot of total head at about 70 % efficiency (HPmotor= Q~gpm x specific gravity X Total head ~ft/(3960 x efficiency). If you had a 500 gpm /10 hp pump it would only deliver around 55 ft of head or about 27 psi.That's about enough pressure to pump it out of a 55 ft well. Find out what pressure and flow are required by the nozzles. Then figure out the pump capacity and pressure required and size the pump on that basis.
Can't help you with prices. There are too many variables. I use a wheel line and hand lines and a couple of 10 HP centifugal pumps that pump from a large sump under the pump house on my ground.

Be careful. Sand wears the bottom of the pipe and that is why they have a limited "shelf life".

Don't know in your particular case, of course.

Allan