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Effective November 1, 2000 WARNING Do not press Metallic wear rings on to a SimsiteŽ Impeller. Metallic rings have a different rate of thermal expansion and could loosen with use. Additionally, Metallic rings will not last as long as SimsiteŽ Rings.   INSTALLATION OF SIMSITEŽ WEAR RINGS ON TO A METALLIC IMPELLER: Prior to the installation of SimsiteŽ Impeller Wear Rings on an impeller, the impeller wear ring surfaces should be machined to insure concentricity. To facilitate pressing the new SimsiteŽ Wear Rings on the impeller, they can be heated in an oven up to 250° degrees F. All SimsiteŽ Wear Rings should be secured on the impeller using Simsepoxy glue. It is recommended that 3 set screws are installed for additional security. (See installation of set screws with a SimsiteŽ Casing Rings.) If set screws are used, the wear ring must be pressed onto the impeller oversized. A final machining cut is required to maintain concentricity and the necessary operating clearance. (See Table 2) ALLOWABLE T.l.R. OF SIMSITEŽ WEAR RINGS: If Simsite Wear Rings are used with Simsite Casing Rings, the allowable total indicated runout (T.l.R.) of the wear rings should be less than or equal to .005 inches. If Simsite rings are used with metallic rings (Sims does not recommend the use of metallic rings with Simsite composite rings because they do not wear as well as Simsite Rings, they are not as efficient, they are not as forgiving, and they will seize if not installed properly.) the total indicated runout (T. I. R.) should be less than or equal to .002 inches. INSTALLATION OF SIMSITEŽ IMPELLERS: Prior to the installation of a SimsiteŽ Impeller into a pump, it is necessary to confirm that the shaft is true (i.e. shaft run-out less than .002”), and that the integrity of the shaft diameter at the impeller bore is good. The key way must be checked to assure that it is clean and that there is a clearance on all sides of key including on top. There should be approximately a .010” clearance on top of the key when it is installed into the shaft and impeller. The impeller should not be pressed on to the shaft when a keyed shaft installation is employed. The bore of a SimsiteŽ Impeller is manufactured with an additional .002 inch (dry) than the shaft diameter. The SimsiteŽ Impeller will swell slightly in water, allowing the fit of the impeller to have an approximate clearance of .0005 to 001 inch, which is necessary for a keyed shaft arrangement. The SimsiteŽ impeller should never be pressed or forced onto the shaft. A soft mallet, however, can be used to gently position the impeller onto the shaft.   WARNING Never force a SimsiteŽ Impeller onto the shaft   The impeller key should be either stainless steel or monel or titanium in salt water service. The key should be in good condition and fit the entire length of the bore of the Simsite Impeller. Like a metallic impeller, the SimsiteŽ Impeller should be positioned in the center of the casing volute. NOTE: The alignment of the coupling and the shaft must be checked cold and warm after assembly. Proper alignment is critical to pump operation and longevity. NOTE: For ship board installation, all major piping must be loosened to make sure there is no pipe strain. If the piping moves after the bolts are removed, the piping must be repositioned to eliminate pipe strain which will fail a pump if not corrected. WARNING After installing a new SimsiteŽ Impeller, it is important not to leave the pump flooded without running the pump for at least 72 hours. During this 72 hour period, the rings will expand to the specified operating dimensions. If for some reason, the pump is left flooded but not running for an extended period of time (more than 3 days), the pump must be rotated at least twice a day until it is started.   INSTALLATION OF SIMSITEŽ IMPELLERS WITH TAPERED BORES: For the design of impellers with a tapered bore, the standard taper must be specified along with the length of the bore and the end diameters. The integrity of the tapered shaft at the taper must be excellent, otherwise the shaft must be replaced. If a collet is used, it should be replaced each time a new SimsiteŽ Impeller is installed. If the SimsiteŽ Impeller has a stainless steel hub insert, then the impeller nut can be installed on the shaft with the torque limit of 80 ft-lbs. However, if the impeller is of all SimsiteŽ construction, then the impeller nut should be installed with a minimum of torque that would be necessary to fit the impeller snug onto the tapered shaft. This limit is set at 20 ft-lbs. Excessive torquing of the impeller nut must be avoided. Experience and "feel” are important considerations. It is also worth noting that when immersed in water the Simsite Impeller will swell, further pre-loading the impeller nut.   INSTALLATION OF SIMSITEŽ IMPELLERS WITH THREADED BORES: The threaded end of the shaft where the impeller fits onto the shaft should be checked to make sure that it is free of any burrs. The integrity of the threaded shaft must be in good condition, otherwise the shaft must be replaced. The SimsiteŽ Impeller should be screwed onto the shaft and hand tightened only. Do not use a hammer, mallet or any other devise to tighten the impeller. WARNING After installing a new SimsiteŽ Impeller, it is important not to leave the pump flooded without running the pump for at least 72 hours. During this 72 hour period, the rings will expand to the specified operating dimensions. If for some reason, the pump is left flooded but not running for an extended period of time (more than 3 days), the pump must be rotated at least twice a day until it is started.   [ Pervious Page ] 1  2  3  4  5  6 [ Next Page ]