METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
(OP)
Hi,
I am sizing pumps for slurry project. Some part of the process contains water while some part contain slurry. My supervisor mentioned that i size for pumps with metal impellers but gave no explaination. I will like to know the advantage of a metal impeller pump over a polymer impeller pump. In which applications will one be preffered over the other.
Thanks,
minengr76
I am sizing pumps for slurry project. Some part of the process contains water while some part contain slurry. My supervisor mentioned that i size for pumps with metal impellers but gave no explaination. I will like to know the advantage of a metal impeller pump over a polymer impeller pump. In which applications will one be preffered over the other.
Thanks,
minengr76





RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
Corrosive fluids may require non-metal impellors- or rubber lined impellors- but once the rubber goes- your back to the same problem.
Rubber lined impellors can give better wear resistance- but are more prone to cut damage (e.g. if pumping sharp, freshly crushed material)- in which case metal impellors may be better.
Personally I'd prefer metal impellors that are corrosion resistant to what I'm pumping- mainly because the potential for decreased wear with rubber lined impellors isn't worth the grief of pulling bits of rubber out of downstream processing equipment.
Cheers
RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
Reasons maybe that the pumps being used aren't manufactured with a polymer option or interchangeablity with other pumps or your supervisors preference based on prior experience.
itdepends (Chemical) - your statement is far too broad regarding rubber lined pumps, in some installations in mineral dressing applications rubber will outlast hard metal many times over and today a number of manufacturers have thick-rubber lined pumps for use on ball mill discharge which is probably the toughest pump duty ever.
RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
A brief spec of the pumps impeller is stated below
IMPELLER IMPELLER
Vanes-5 Vanes-5
Vane Dia-510mm Vane Dia-510mm
Type-closed Type-closed
Material-Metal Material-Polymer
LINER (Norm Max r/min) LINER (Norm Max r/min)
Metal 1000 Metal 940
Polymer 1000 Polymer 1500
My manager said the reason for choosing an impeller with metal material is because the mineral to be pumped are abrasive in nature and will wear off an impeller made from polymer faster. This i argue because after a little bit of research, i found that both type of impellers can actually withstand abrasion.
I need more insight on this, so that i can understand the advantages of
(a) Metal impeller versus polymer impellers
(b) Metal linings versus polymer linings.
Thanks.
RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
I'd agree with using rubber lined pumps on ball mills- as long as you don't have heat exchangers downstrem (like I do) which don't appreciate the lumps of rubber that can come off.
Cheers
RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
minengr76
1)What are you pumping (what is the liquid, solid (type, particle size, where's it coming from, is it corrosive)
2)What/where are you pumping it to.
3)What is the discharge head and how fast are you going to have the pump going? (rpm and tip speed)
RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
But to answer your intial post, the normal rule of thumb is, large hard solids- metal, fine abrasive solids - rubber, although with thick-rubber liners that a couple of pump manufacturers can now offer or the use of the very hard abrasive resistant hi-chrome irons available today in some cases be reversed.
Why not ask Warman - who else is better qualified to make a selection on materials for you.
RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
regards
John
RE: METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP
Dont forget about operating temperature. Metal impeller withstand with more higher temperature
And also what type of fluid pumped. Although polymer/rubber is more applicable in corrosive environment, it might not suitable for some material, depends on what type of polymer you use for the impeller (material compatibility)
-rayz-