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We are located in the western United States. Stanier - I have been in contact with GIW here locally and they have been helpful in given references. Thanks.

Thanks for the feedback - I am currently looking into the suggested firms. Ideally, I'd like to find a retired pump engineer as opposed to going through a consulting firm. Thanks again.

At our mine site we have all types and sizes of pumps and there appears to be plenty of room for optimization. I am interested in bringing in a pump consultant who has had extensive experience with pumping a high-solid slurry. There are plenty of pump reps available who are helpful but it is...

I have checked with a number of aircraft ground support companies. They have a number of "welded" hoses but their weight is more than I'd like. Their fabric hoses have the same leakage problem as this one does. I may be asking for too much -- Regardless, it has been helpful to hear other's...

Works great walz!

RossABQ -- I had never thought of fire hose... why not? It may be a little heavy but we'll see. We are simply using the hose to transport the air so there is only one outlet. Compositepro -- I agree that the seam will be a portion of the problem. I guess the Vyna Bond will help me seal off the...

We aren't your standard HVAC company :) -- For this specific application a 4" duct is ideal -- and yes we're pushing 5 psi (~ 140 inches w.c.). The duct was built specifically for this purpose -- Thanks.

I am testing a 150'long 4" dia fabric duct carrying air which enters the duct at ~ 5 psi. Due to the seam along the hose and the losses between duct connections (one every 50 ft) I am losing an incredible amount of pressure and airflow. I have recently ordered some "Vyna Bond" to seal the...

Walz, I don't see the formula "psychro" when I installed your add-in... the only one that resembled your description above was a formula names "fatafut"... it returns a result of -1 regardless of the parameter values.... any ideas?

I have run into this problem various times. One of my colleagues forwarded me this Excel based Psych chart which is written in VBA. You'll have to dig into the code and copy out what you need to make your own formula but it is by no means difficult as long as you have a basic knowledge of VBA...

vzeos: Thanks for the help! I iterated per the instructions of BigInch and received the results I needed. The equation you provided gave me near exact results to those which I iterated. However, it is handy to have an equation which Excel can equate for large amounts of data. In hind sight...

I will try iterating ... I solved the Haaland equation for ? and, as I mentioned earlier, saw results which were not realistic.

thread378-220785 I have read a number of posts on this site which mention "back calculating" to find the roughness of a pipe/hose (see link). I have a fabric duct used for HVAC which was sent to us for R&D purposes from the manufacturer. I am having trouble back calculating my test results to...

In order to determine what effect this impeller diameter change(and motor change) will have on our electricity costs per year I have done the following calculations: (Do these numbers look right according to the affinity laws?) New Impeller Diameter: 25" Old Impeller Diameter: 14.4" New Motor...

One other question: I am trying to determine which pump would run better in our system. The first is a 4X6 which has a peak BEP @ 70%. Due to our low flow we would only be able to run the pump at around 45%. The advantage to this pump is it is the same model as others we have so therefore...

Just as a little FYI; Our steel liners gave us 866 hours of life. A little over double our average at a little under double the cost. Not exactly what we were hoping for. I have been in contact with a pump manufacture and the larger impeller(25") seems to be the next step.

We went with 1/2 inch plate and 8 inch channel. The skid looks good, we'll put it to the test next week.

Thanks again for the responses. I am thinking on paper here.... We have the pumps running off of VFDs. The VFDs are controlled by the mill box levels and the desired flow rate of the system. By increasing the impeller diameter we will be able to pump the same amount of slurry at a lower speed...

Sorry for the duplicate...

I believe we are using the Hi-Chrome Iron. Do you suppose by increasing impeller diameter will not only slow the pump down but increase pressure inside the casing thus increasing wear on the liners? Is a matter of picking your poison? Also, has anyone had experience with GIW(Georgia Iron Works)...