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  1. robs68charger

    Pump Automation/Squencing

    Pumpsonly, I had cpmletely forgot about pump failure by measuring current. This seems to be the easiest way and best way. Thanks to everyones input.
  2. robs68charger

    Pump Automation/Squencing

    Pumpsonly, As far as the flow switch I was figuring of using something similar to this: http://www.flowline.com/thermoflo_xt10.php I thought about a pressure switch but if the pressure in the line remains relatively constant then I figured the pressure switch wouldn't work. I also guess I...
  3. robs68charger

    Pump Automation/Squencing

    So I am working on a project but am not sure about one aspect. I am working on a system that has 2 pumps, 1 main, and 1 stand-by. Each time the pump is to turn on it will alternate which pump turns on, not a issue becasue I can just use an alternating relay. The trouble I am having is that if...
  4. robs68charger

    Suggestions for a 15% clay solids / 85% water slurry pump

    An AODD or AO Pistin Pump can handle this. You can get an AODD Pump with an Output pressure of more then the air inlet pressure. So lets say it is water and 150 ft of head is approx 65 psi. An AODD pump can have a max air inlet pressure of 120 psi with a 1:1 ratio and pump your fluid at a...
  5. robs68charger

    Calculating the needed height for reservoir

    Why not just purchase a pulsation dampner. They make them specifically for these reason. There is no need to redo what many other companies already do. Just my thought
  6. robs68charger

    Purchasing New CNC

    I do some side work for my friends designing parts. We actually bought the Tormach. It was and is my first experience with doing CNC machining. It is pretty good, but has its draw backs. It won't machine as fast as the "big dogs", does not have a pallet, and has a smaller table then other...
  7. robs68charger

    Diaphragm Pumps Wearing Fast

    Another option is using and ARO AODD pump. They have the option of Santoprene balls and seats. I believe they also offer the option of 400 series stainless steel balls and seats. The advantage with the ARO pump is it uses less air and does not freeze over. The air section has a design that...
  8. robs68charger

    Nema 7/Explosion Proof VFD

    Thanks, I had the same feeling. I let my customer know they could use a VFd mount it in a safe location.
  9. robs68charger

    Nema 7/Explosion Proof VFD

    I have a customer that has requested an expolsion proof motor on their metering pump. They also want an expolsion proof VFD to accept a 4-20mA signal. Does anyone know of a manfacturer of such a beast, or have any suggestions? I am almost thinking they should just buy a normal VFD and mount...
  10. robs68charger

    How do the polish parameter affect the optical connector's geometry

    I used to fiber optic comm for a living, put me through school. I found that the best polishing came from using a glass plate with a good puck. Corning makes some good pucks that hold the connector square. I also used .5 to 1 micron paper for the final polish. But then again you can use...
  11. robs68charger

    Beginner - best piping for most flow - 2" pvc

    As Stonecold suggested using a flowmeter can be good. As also stated using an LMI metering pump, say a 7 series, can accept the pulses from the flowmeter and inject your acid and fertilizer as you decide. This also allows for the lack of reducing down for you injectors and no 12 psi pressure...
  12. robs68charger

    Pump System Trouble

    Well I got the piping details and did the calculations and actually had to find the delta P from the strainer via testing and found that the customer does need to improve the piping because his NPSHa was below the NPSHr. I told the customer he had redo the piping, the cheapest, or buy a pump...
  13. robs68charger

    Pump System Trouble

    So a customer has a filtration system of ours that includes a centrifugal pump. The pump is rated for 500GPM at 70 TDH. The system draws from a basin. The suction is a flooded suction, ie the inlet of the pump and inlet piping are below the waterlevel in the basin. The system loses about 8...

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