ARCHIVED REPORTS LEC APPLICATION FOR CERTIFICATION

Home Browse Search

® WorleyParsons resources&energy Boiler feedwater pumps will provide feedwater consistent with the HRSG design conditions as stipulated in ASME, Section I, Power Boilers, paragraph PG-61. Where there is an intermediate pressure level in the steam generator, and the flow rate of the intermediate level is less than approximately a third of the high-pressure section, the boiler feedwater pump will include an interstage bleed. The interstage bleed will allow a single pump to feed the high pressure as well as the intermediate pressure levels of the HRSG. Where the flow rate of the intermediate level is more than a third of the high- pressure level, separate boiler feed pumps will be provided for the required pressure levels of the HRSG. An interstage bleed type of pump will be provided with one recirculation valve installed on the high-pressure section. Minimum flow measurement will be taken from the high- pressure feedwater flow element. Recirculation flow will be directed to the low-pressure drum. No recirculation valve is required from the bleed section of a pump. The boiler feedwater pump will be equipped with a "T-type" suction strainer (with at least 4 x pipe area) consisting of a 120 mesh enclosed by a permanent 80 mesh strainer. Each boiler feedwater pump will be provided with its own, closed lubrication system. Pump start up will require lubrication system start up before the pump is allowed to start. Pump shaft seals will be mechanical, designed for the proper temperature. Vibration Probes - Vibration probes will be Bently Nevada Series 3300XL proximity probes. Vibration Monitoring System - A separately mounted vibration monitor system will be provided to monitor the boiler feed pump and motor probes. Vibration monitors will be Bently Nevada Series 3500 and one vibration monitor will be provided for each set of two motor/pump sets. DCS Alarm and Tripping - 4-20mA signals from the 3500/42M proximitor monitors for each boiler feed pump will be wired to the balance of plant DCS system for indication, alarming, and tripping. Each HRSG will have two 100%boiler feed (very high flow operating cases will require dual pump operation).). The boiler feed pumps will be electrically driven, multistage, centrifugal pumps with the following: • Heavy-duty baseplate for all components and accessories. • Sleeve bearings and Kingsbury-type thrust bearings with forced oil lubrication. • 400 series stainless steel shafts and chromoly cases (API 610 Table H-1 C-6). • The pump system will include the following instrumentation: o Discharge Pressure o Discharge Temperature o Bearing Temperature Lodi Energy Center 3.3 - 15 LEC AFC 071508 Rev.A