Hermetic: 12-stage canned motor pumps for ethane cracker plant


IMG_1941The actually supplied two canned motor pumps, with “tandem” design, convey the medium [C3 fraction with propylene as main constituent] at a temperature of 22 °C. The differential head [H] is 379 m at a flow rate [Q] of 7.8 m³/h. The pump units are designed for a nominal pressure of 40 bar and have temperature- and level-monitoring features. For online monitoring of the hydraulic axial bearing, a rotor-position monitoring feature is also provided.

The special tandem design of the multistage pumps results in minimal shaft deflection and load relief at the slide bearings. The “ZART” (Zero Axial and Radial Thrust) technology ensures a contact- and wear-free running of the rotor unit.

After a detailed evaluation of possible solutions, the Noretyl AS opted for the canned motor pump. The decisive factors were the high level of safety offered by the sealless (and thus leakage-free) design along with the absence of wear parts and, consequently, longer maintenance intervals. In operation canned motor pumps are convincing by easy installation and commissioning, compact footprint, quiet and vibration-free running and a comparatively small amount of instrumentation.




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