Centrifugal pumps for petroleum, heavy duty chemical, and by American Petroleum Institute.; American National Standards

By American Petroleum Institute.; American National Standards Institute

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2 Thrust forces for flexible metal element couplings shall be calculated on the basis of the maximum allowable deflection permittedby the coupling manufacturer. 3 If a sleeve bearing motor (withouta thrust bearing) is directly connectedto the pumpshaft with a coupling, the coupling transmitted thrust will be assumed to be the maximum motor thrust. ries). Unless otherwise specified, bearings shall be installed back-to-back. 1 . l . 1 Bearing housings shall be arranged so that bearings can be replaced without disturbing pump drives or mountings.

Unless otherwise specified, the bearing type and arrangement shall be selected in accordance with the limitations in Table2-7. 2 Thrust bearings shallbe sized for continuous operation under all specified conditions, including maximum differential pressure. All loads shall be determined at design internal clearances and alsoat two times design internal clearances. In addition to thrust from the rotor and anyinternal gear reactions due to the mostextreme allowable conditions, the axial force transmitted throughflexible couplings shall be considered a part of the duty of any thrust bearing.

G. The required service factor. h. The ambient temperature and elevationabove sea level. 8 Unless otherwisespecified, motors for vertical i. Transmission losses. pumps shall have solid shafts. When the pump thrust bearj. Temperature detectors, vibration sensors, and heaters if ings are in, the motor, the motors shall meet the shaft and these are required. base tolerances shown inFigure 3- l . k. Vibration acceptance criteria. 9 Unless otherwise specified, steam turbine drivers 1. Applicability of API Standard 541 or IEEE 841.

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