Impeller Design

• Oct 25, 2001

• #2

MortenA

Chemical

Aug 20, 2001

2,998

DK

Could the impellars be worn?

Best Reagrds

Morten

 

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• Oct 26, 2001

• #3

butelja

Mechanical

Jun 9, 1999

674

US

Have you checked the wear on the impeller wear rings? Verify the correct clearange bewteen the impeller inlet shroud OD and the pump casing inlet wear ring ID. If it were a semi-enclosed impeller, then check the impeller end clearance.

 

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• Nov 8, 2003

• #4

PUMPDESIGNER

Mechanical

Sep 30, 2001

582

US

You did not provide anywear near enough info so we can only wildly guess. Wear ring clearances as butelja suggested often cause performance loss and the smaller the pump and the lower the Ns of the pump the more effect wear ring clearances have.

What hp and what rpm, NPSHA vs. NPSHR, Pump Nss and Ns, impeller diameter? Whatever you have would help.

PUMPDESIGNER

 

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• Nov 10, 2003

• #5

HomeMadeSin

Mechanical

Mar 17, 2003

77

US

Also, make sure your calc's are correct (adjusted to centerline of the pump). Some pump manufacturers calculate the performance of the pumps they publish, so it isn't uncommon to find one "out-of-spec". Also, they only guarantee one performance point, not the whole curve.

Also, what type of drive. I assume direct and not magnetic.

 

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• Nov 10, 2003

• #6

TD2K

Chemical

Jan 11, 2002

2,629

US

I doubt Trojan is still watching this thread, the last time they are showing as logging in to the site is October 24, 2001

 

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