I have a problem for a vertical turbine pump. The vibration measurement shows a figure which is marginally higher than the allowance of Hydraulic Institute when the measurement is made at non-drive end of motor. If we measured at dirve end of the motor, it is within the allowable limit.
In the Handbook of Hydraulic Institute, it seems that allowable limit referred to the measurement made at drive-end position. Do you know what should be the right position for vibration measurement of vertical trubine pumps.