Oil discharged by this pump also ordinarily lubricates the turbine's bearings and may be used in the pump's governor. Bearings in a turbine-driven feed pump, however, are usually lubricated with oil that is circulated by a shaft-driven rotary pump. Motor-driven feed pumps may have grease-lubricated external bearings. Shaft Sleeve Thrust bearing Line bearing FIGURE 5 Flex-coupled multistage centrifugal main feed pump (Flowserve Corporation) FIGURE 2 Vertical back-pull-out centrifugal pump (Flowserve Corporation)Ĭasing wearing ring Impeller nut Shaft sleeve Glandġ1 Packing FIGURE 3 Horizontal close-coupled centrifugal pump (Flowserve Corporation) FIGURE 4 Close-coupled single-stage centrifugal main feed pump (Coffin Turbopump)Ĭasing Impeller Stage piece Casing wearing ring Motor-driven feed pumps, however, have been used in both horizontal and vertical configurations. Turbine-driven feed pumps are usually mounted horizontally. Although flexibly coupled feed pumps often have cast axially split volute-type casings (Figure 5), barrel pumps with diffusers and forged cylindrical casings are sometimes used. Typical feed pump configurations include single- and two-stage centrifugal pumps that are close-coupled to steam turbines (Figure 4) and multistage flexibly coupled pumps that are driven by steam turbines or electric motors. Additional pumps are ordinarily provided for standby duty. Although a single feed pump is frequently sized to handle a vessel's full-load requirements, some ships have multiple partial-capacity feed pumps that operate in parallel. In addition, the feedwater usually passes through one or more heaters before entering the steam drums. In many cases, a main feed pump's discharge is connected to two separate lines that both lead to the boilers: a main feed line and an auxiliary feed line. On a typical steam ship with fossil-fueled boilers, a main feed pump takes suction from a deaerating feed tank (DFT) and discharges feedwater to the steam drum in each of the vessel's boilers.
We can handle AOG time constraints with ease using our expedited shipping and same-day shipping services.Feed pumps A main feed pump is used to return water to a steam-powered vessel's boilers or steam generators. Our shipping and supply chain features some of the fastest shipping times in the industry. We are the only independent distributor with a NO CHINA SOURCING policy.
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