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I think your flush water design is the key in this application. Normally it requires the flush water pressure being 5 to 10 psi higher than the pressure in the casing. With certain lantern ring design, a minimum flow will be resulted in from the flush side to the casing. It sounds that your...

Have a look of the level in the pumpbox. Likely the level is low, or very low. Try to throttle down a little the valve (ball or butterfly) at the discharge pipe. This will reduce the pumping rate and force the suction level higher. Reduced flow rate also means a reduced NPSHr. If the level is...

I believe you are using a positive displacement pump such as a gear pump or piston pump. For a PD pump at a fixed speed, the pressure is determined by the back pressure in the piping system, in your case, mostly the blasting nozzle. If you have a good method to adjust the diameter of the nozzle...

Air diaphragm pump is a good choice if there is air source nearby. Be aware it generates pulsations. Hose pump is the first one I thought, but you'll have to replace the hose a couple of times minumum in a year if the pump is continuous running. Rotary lobe can also be used for slurry...

My question is do you think if my understanding is right or not. What is your experience what facing a Category M test?

I'm in mining consulting business where there are not many Category M fluids. We use B31.3 for piping design. Per ASME B31.3, para. M345 Testing, a sensitive leak test shall be included in the required leak test. My understanding is : a normal hydrostatic test is required (1.5x design...

I posted this under Polymer Processing but maybe this is the right forum. A PVC pipe for sodium cyanide transportation needs to be replaced due to aged material. Does anyone know if any code or regulation is related to the piping material for cyanide solution? I need to decide if I have to use...

A PVC pipe for sodium cyanide transportation needs to be replaced due to aged material. Does anyone know if any code or regulation is related to the piping material for cyanide solution? I need to decide if I have to use a CS pipe (our standard pipe spec) or use a new PVC pipe( same as original...

It seems people who can answer the question are not on this forum. They are making big money from the market. For me to predict the copper price, just simply not believe it can drop back to anywhere below 1.5 $/lb, although demand may drop a bit and new mines (or smelters) are going to be...

just cannot resist the idea to give Montemayor a star.

Morten, I did not mean that the head was bigger for heavier liquid. It was heavier liquid pushing lighter liquid that aquired bigger total head than the operating point shown on the curve (heavier fluid in the pump but lighter in the piping). I think this can be easily explained by general...

That's something I was confused when started working on pumps years ago. A pump was used to pump a heavy liquid, say SG=1.5. The liquid was joined by a lighter liquid somewhere at the discharge piping, so the liquid SG became 1.1. We found the total head generated by the pump was much bigger...

Sure you can use launder or other open channels for your bitumen froth transportation. But you may need to have some knowledge about your fluid and to make your design conservative. The best way may be to do your test and find out the relation between Manning number and viscosity. I hope...

BigInch, your spreadsheet is for piping flow only and may not apply to elam's situation. Both Manning and Hazen & W. (for open channel) formulae are for water only (or fluid with same or similar viscosity to water - density shall not a problem here). I really doubt if anything readily...

Dimtec, "I would post the result of the modification."???

A No-Name explicit equation I have used for years: f=1.325/(ln(e/(3.7*D)+5.74/R^0.9))^2 I've been feeling comfortable about its accuracy but you may check it against the listed equations. Regards,

For a start, contact your local slurry pump reps, they may probably give you some manuals such as Weir's (Warman) SLURRY PUMPING MANUAL or GIW's SLURRY PIPELINE DESIGN MANUAL. For the latterone, you can fill in a request on their website and they'll mail you one. For more complete and advanced...

There was a discussion lately. See link: http://www.eng-tips.com/viewthread.cfm?qid=148464&page=5

The discharge pressure is close to 100 psi. I've given up this option.

See thread: Small pipe discharge: open channel or siphon thread378-136655