Sealless centrifugal pump standards and their selection: (1) sealless centrifugal pump should be used radially split pump casing, axial split casing shall not be used. Today's latest valid order information free to send! Morning latest buyers information free to send! Punch grab Rob here! (2) For medium and light load sealless centrifugal pumps, the minimum design pressure of pump casing should be 1.6MPa (G) or more (at 20 â„ƒ); for heavy duty sealless centrifugal pumps, the minimum design pressure of pump casing should be The smaller of â‘ and â‘¡: â‘£ The allowable pressure corresponding to the flange of IS0 7005-1PN50 (ASME Bl6.5, Class 300) equivalent to the material of the casing, â‘¡ 4MPa (G) at 38 â„ƒ. (3) For medium and light load sealless centrifugal pumps, the flanges are allowed to withstand external forces and external torque should be consistent with the manufacturer's standard; for heavy duty seal-free centrifugal pumps, the flange allows the external force and external torque should be consistent with the API Article 6.5 of Std 685-2000 (Article 2.4 of the NNT API Std 610-l995). (4) The radial runout (TIR) â€‹â€‹of shafts shall be less than or equal to 0.05 mm for medium and light load sealless centrifugal pumps; the radial runout (TIR) â€‹â€‹of shafts shall be less than or equal to 0.025mm. (5) For medium and light load sealless centrifugal pumps, impellers and similar main rotating parts shall be subjected to the dynamic balance test according to IS0 1940, Standard G 6.3; for heavy duty sealless centrifugal pumps, every major part of the rotor Including couplings for magnetically driven pumps) should be dynamically balanced and comply with the IS0 1940 standard G Class 2.5 requirements. (6) For medium and light load sealless centrifugal pumps, the vibration speed (root mean square, unfiltered) measured at the bearing point of each bearing shall not exceed 4.5 mm / s at the rated operating point; for heavy loads Sealed centrifugal pumps, operating within the preferential operating range, the vibration speed (root mean square, not filtered) measured at the bearing point of each bearing shall not exceed 3.0 mm / s. Vibration limits may exceed 130% of the above values â€‹â€‹beyond the priority operating range. (7) Pressure-free parts of sealless centrifugal pumps shall not be cast iron. (8) sealless centrifugal pump taboo dry operation, in order to avoid sliding bearings and isolation sleeve (or shielding sleeve) burn out. (9) sealless centrifugal pump due to the use of sliding bearings, and with the media being lubricated, so more suitable medium viscosity range of 0.1 ~ 20mPa'S. Note: When the medium viscosity is low, the use of vertical structure can improve the pump lubrication performance. (10) sealless centrifugal pump should be regularly checked current, temperature and outlet pressure is normal, whether leakage operation, is stable, vibration and noise are normal and so on. (11) Sealless centrifugal pumps are usually less efficient than sealed centrifugal pumps. However, in the case of medium and low power, compared with the double-end seal pump, the latter has little difference in overall efficiency due to the increased power consumption of the cooling and flushing systems.
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