Congrats to Searchwise015 for being first to solve and find the cache!
Instructions added on 7/9/24 for some additional help!!
Hello budding engineers (and problem solvers in general!!) to our first geocache hide! 
We have put some nice little treasures in the cache!
We live near Engineer's Park, and I'm a Chemical Engineer; so we (Hobbsy, Ally, and Geo-Dog Juno) have decided to have an Engineering theme, and so you're going to have to put on your problem solving caps to read this pump curve to get the final co-ordinates.
The pump might look daunting, but really, it is just reading lines across and down page. We use these curves to choose pumps and motors required for applications - e.g., for minerals processing plants to pump slurries into separation equipment.
First off, here is the pump curve. Flow rate is on the X-axis (horizontal), and head pressure is on the Y-axis (vertical).
Questions:
Pump selection note: Choose the pump size that can pump 700 GPM at 40ft of head.
a) What is the pump flow rate at 50ft of head (in GPM)?
b) What size pump do you need (in inches)?
c) What is the minimum sized motor you need (in hp)?
The password format is "(a), (b), (c)" - e.g., 100, 13, 15 (with spaces after commas)
Alert: You are about to download a file or access a link that contains details to required to find this geocache. As the geocache owner, I ensure that this file is safe to download. It has not been checked by Geocaching HQ or by the reviewer. Download this file at your own risk.
The answers are used to access the coordinates in this image.
Put on mozzie spray, and a small torch (on your phone) will help find the cache.
I have put instructions at the bottom of this page 7/9/24.
FYI - Here is a DMC operating in Queensland's Bowen Basin (and the top of a second in the background). This DMC has a 1300mm internal diameter at the cylindrical section. The largest are up to 1600mm and can handle over 600 t/h of feed solids (coal and rock).
Instructions, added 7/9/2024
This cache is six months old now, and so I have decided to add some instructions to help more people find it! I hope that these help. Please contact me if you need a hand.
1) Identify the head required. Below, I have chosen 100 ft (red square)
2) Draw a horizontal line across the page (2)
3a) Look for a pump that is most suited to this head (on some curves this is RPM, but on these it is size).
3b) in this case, it is a 5.5" pump (green square) This would Answer B.
4) Draw a vertical line that intersects lines 2 and 3.
5) You have you Answer A (flow rate) in the blue box.
6) The intersect lies in the 5HP shaded area. You need a 5HP motor, minimum (Answer C).
