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® WorleyParsons <br /> resources&energy <br /> Pumps will be sized for maximum efficiency at the normal operating point. Pumps will <br /> be free from excessive vibration throughout their operating range. <br /> Pumps will operate satisfactorily at various flow rates up to maximum pump output. <br /> Pump motors will be sized so the selected pump impeller will not overload the motor at <br /> any point on the pump head-capacity curve. Wear rings will be provided as appropriate. <br /> Vent and drain valves will be fitted at high and low points on the pump casing. Pumps <br /> rated 25 hp and above typically have a recirculation line for protection. The <br /> recirculation line will normally be routed to the source from which the system takes <br /> suction. Restriction orifices will be used as appropriate. <br /> Horizontal split-case pumps will allow the removable casing half and impeller to be <br /> withdrawn without disturbing any of the process piping or valves. Horizontal end- <br /> suction pumps will allow the impeller to be withdrawn without disturbing the motor or <br /> discharge piping. <br /> Pumps will have expansion joints between the inlet and outlet side and piping connected <br /> to them as required by good engineering practice. <br /> Strainers (startup or permanent) will be installed in the suction piping of horizontal <br /> pumps or sets of pumps. The driver will be mounted on an extension of the pump <br /> bedplate and will drive the pump through a flexible coupling. <br /> Vertical shaft pumps will be designed to Hydraulic Institute standards and will generally <br /> be arranged to work with the pump casing submerged in a sump or tank. The suction <br /> branch will be arranged vertically downward and, if required for the service conditions, <br /> will be fitted with a strainer. When pumping fresh water or condensate, bearings <br /> situated below water level will be water lubricated. Discharge piping and non-return <br /> valves will be arranged to facilitate withdrawing the complete shaft and pump casing as <br /> a unit by splitting a pipe joint above floor level. <br /> Pumps will have mechanical seals (25,000-hr life if available), if appropriate for the <br /> application. In general, major pumps will be specified to have mechanical seals. Pumps <br /> with mechanical seals will be arranged to facilitate seal removal. Shaft slingers will be <br /> specified to prevent packing gland leakage water from entering bearing housings. <br /> Bearings requiring cooling water will include the necessary pipe work, valves, and <br /> strainers. <br /> Couplings and any intermediate shafting will be provided with OSHA approved guards. <br /> Bedplates will be of ample proportions and stiffness to withstand the loads likely to be <br /> experienced in shipment and service. <br /> 3.12.2 Boiler Feed Pumps <br /> Lodi Energy Center 3.3 - 14 LEC AFC <br /> 071508 Rev.A <br />