Bearings. Motors shall be equipped with anti-friction type thrust and guide bearings. Angular contact ball thrust bearings shall be used in preference to spherical roller thrust bearings wherever possible. Angular contact ball thrust bearing shall be self cooled wherever possible. Water cooled angular contact ball thrust bearings shall be used only when approved by District. Spherical roller thrust bearings shall be water cooled. Bearings shall be of sufficient capacity to carry all static and dynamic up and down thrust loads, both momentary and continuous, imposed by the pump. Bearings shall provide minimum 3 year B10 life (26,300 hours) based on continuous design thrust load or minimum 1 year B10 life (8770 hours) based on maximum pump shutoff thrust load, whichever is greater. Bearings shall also provide for minimum momentary upthrust equal to 30% of rated downthrust.
Bearings. Provide the same type bearings for an alternate bridge structure as specified for the "as-designed" bridge structure. Provide an expansion dam support system as indicated for the "as-designed" bridge structure unless otherwise specified in PART B, "SPECIAL DRAWINGS AND SPECIAL DESIGN REQUIREMENTS".
Bearings. Bearings shall be inspected for damage. Removal and installation of bearings shall be done in accordance with the manufacturer's requirements. New bearings shall meet the original specifications.
Bearings. Three deep-groove, anti-friction ball bearings shall be located outside the pumping chamber, which shall give support and proper alignment to the impeller shaft assembly. The bearings shall be oil or grease lubricated, completely separated from the water being pumped, and shall be protected by seal housings, flinger rings and oil seals.
Bearings. MEASUREMENT VALUE --------------------------------------------------------------------------------------------- Radial type (2) Tilt Pad --------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------- Thrust type (1) Tilt pad ---------------------------------------------------------------------------------------------
Bearings. Bearings shall be roller type except that motor bearings shall be of ball or xxxxx r type only. For rope drums, LT and CT drives, self -aligned roller bearings shall be used. All anti -friction bearings shall be of approved brand. Bearing housings shall be of split type or so designed to permit easy removal of the shaft. The design shall b e such that there is no ingress of dust to enter and oil or grease should not leak out from it. Drip pans shall be provided to accept accidental leakage and drippings. Bearings shall have minimum life expectancy of 7000 working hours.
Bearings. 2.1 For each motor for all motions 1 Set 2.2 Main Hoist Gearbox 1 Set
Bearings. Roller bearings shall be used throughout. Taper roller bearings shall be used to sustain radial and thrust loads. Bearings shall be designed for a design life in excess of the indicated hours in the table below, in accordance with ISO.281. Bearings for the output shaft shall be designed to withstand bending, up thrust, down pull and radial loads imposed by the equipment being driven. Tenderer’s shall indicate what these forces are and how these shall be accommodated. The Contractor shall ensure the lubricant used for the initial filling and specified in the maintenance manual, is adequate for prolonged operation in ambient temperatures of up to 45°C without overheating. Process Units Design Life Operation Rotating Bridges: Sedimentation & Clarifier Tanks L10 for 75 000 Continuous Rotating Scraper System: WAS Thickeners & Fermentation Tanks L10 for 75 000 Continuous Aerators L10for 100 000 Continuous Mixers L10 for 100 000 Continuous Screw & Plunger Pumps L10 for 100 000 Continuous Centrifugal Pumps L10 for 100 000 Continuous Dosing Pumps L10 for 100 000 Continuous Mechanical Screens L10 for 75 000 Continuous
Bearings. All bearings shall be suitable for shaft rotation in both directions. All bearings shall be designed for a life of at least 100 000 hours at an (L10) rating. Bearings for the output shaft shall be designed to withstand bending, up thrust, down pull, thermal expansion and radial loads imposed by the impeller. The rotating assembly shall be positively located in the axial direction and thrust bearings will therefore be required. For ease of lubrication all bearing grease pipes must be piped to grease nipples on the outer cover of the pump support frame.
Bearings. Class 16 (1600 kPa) valves or valves with diameters of 350 mm or bigger shall be fitted with two-way adjustable bearings in order to permit precise disc-to-seat positioning at all times. Positive bearing retention shall also be provided so that the bearing will not shift under operating conditions. The valve shall be capable of being installed and operated in any position. The bearings shall be self-lubricating, long lasting sleeve-type bearings shall be fitted in the hubs of the valve body and at least one set of thrust bearings shall be provided.
