Pump Close Tolerance Fits

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ISO Fit Grade categories include:

20 points

Tight, Transitional, Loose.

Interference, Loose.

Interference, Transitional, Clearance.

Acceptable, Not-Acceptable.

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Horizontal, oil lubricated bearing clearance:

20 points

Are determined by ISO Fit Grades.

Have various “rules of thumb”.

Can be determined from the bearing dimensions.

Can be determined from the shaft diameter.

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Because of the length of the machine, perpendicularity tolerances for vertical turbine pumps are not as tight as for shorter machines:

20 points

True

False

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Pump wear ring clearance:

20 points

Are reduced for high specific speed impellers.

Depend on the viscosity of the pumpage.

Vary significantly among pump manufacturers.

Are more critical for low specific speed impellers.

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The dimensional tolerances for P-flange motors:

20 points

Vary with the OD of the flange.

Are provided by national standards organizations such as NEMA.

Have different tolerances for concentricity and for perpendicularity.

All of the above.

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