【正文】 ter of suction pipeline. The expansion pipe should be set up between inlet of pump and suction pipeline so as to disassemble pump.② Discharge pipelineDiameter of discharge pipeline: diameter of discharge pipeline is usually bigger than outlet of pump because diameter of discharge pipeline is related to properties of slurries and sedimentation flow rate.Gate valve of discharge pipeline: Diameter of outlet gate valve is equal to diameter of discharge pipeline.Piezometer: The piezometer should be set up on the ascending pipe between outlet of pump and the first valve.③ Points for configuration of pipelineThe diameter of pipeline is related to system resistance, critical sedimentation velocity of slurry etc. Before inlet of pump, onestage pipe longer than 3 times diameter of pipeline had better be installed. The velocity of slurry is between and m/s, which is determined by critical sedimentation velocity of slurry. When we install suction pipe in suction arrangement we adopt pipe of varying diameter whose upper generating line is horizontal to avoid cavitation (See Figure, 6). Figure 6 Reducing pipe with horizontal upper generating line When we adjust the capacity of pump with throttle, throttle should be installed on the discharge pipeline. When throttle is fixed on suction pipeline, cavity will happen easily.(4) Pipelines of watersealing and watercoolingPacking seal will be equipped with stubs and piezometer. We must install pressure gauge on shaft seal water pipeline to adjust the pressure of shaft seal water. The setting of shaft seal water pipeline and watercooling pipeline are seen Figure7. The Shaft seal water Watercooling Figure 7 Arrangement of shaft seal water pipelineThe pressure of shaft seal water should be puted according as the following formula.Table 1 Pressure and Capacity of shaft seal waterSealing TypeThe Pressure of shaft seal water Pi’(Mpa)The flow of shaft seal water （m3/h）G1/4”G3/8”G1/2”G3/4”Expeller Seal （Ⅰstage pump)Pi’=1~~22~33~5Packing SealPi’=(i1/3)PMechanical SealPi’=P出+ pump flow 1%, when the flow is large choose small values, flow is small choose big value , but the minimum shaft seal water quantity not less than 1 m3 / h Note: This Table is suitable to single stage pump. When the suction pressure of pump is 0 (Pin=0), the pressure of shaft seal water is equal to the half of the pressure of pump exit (P’=1/2Pout). The pressure of watercooling is between ～, the capacity is between 1～3 m/h.The type of watercooling see Table 2.Table 2 Type of Packing, watersealing and watercooling No.ModelPacking Specification(mm) ssssSsSSpecificatioSpecificationpecification Specification （mm）(mm)Shaft Seal Pipe JointCooling Water Pipe Joint 1300ZJ—Ⅰ—A1002222636G3/4″G1/2″2300ZJ—Ⅰ—A953300ZJ—Ⅰ—A902222605G3/4″G1/2″4300ZJ—Ⅰ—A855300ZJ—Ⅰ—A701919502G1/2″G1/2″6300ZJ—Ⅰ—A657300ZJ—Ⅰ—A568250ZJ—Ⅰ—A1032222605G3/4″G1/2″9250ZJ—Ⅰ—A9610250ZJ—Ⅰ—A9011250ZJ—Ⅰ—A8512250ZJ—Ⅰ—A8313250ZJ—Ⅰ—A8014250ZJ—Ⅰ—A7815250ZJ—Ⅰ—A751919502G1/2″G1/2″16250ZJ—Ⅰ—A7317250ZJ—Ⅰ—A7018250ZJ—Ⅰ—A6819250ZJ—Ⅰ—A6520250ZJ—Ⅰ—A6321250ZJ—Ⅰ—A6022200ZJ—Ⅰ—A852222605G3/4″G1/2″23200ZJ—Ⅰ—A751919502G1/2″G1/2″24200ZJ—Ⅰ—A7325200ZJ—Ⅰ—A701919455G1/2″G1/2″26200ZJ—Ⅰ—A6827200ZJ—Ⅰ—A6528200ZJ—Ⅰ—A6329200ZJ—Ⅰ—A6030200ZJ—Ⅰ—A5831150ZJ—Ⅰ—A7032150ZJ—Ⅰ—A6533150ZJ—Ⅰ—A6334150ZJ—Ⅰ—A6035150ZJ—Ⅰ—A5836150ZJ—Ⅰ—A5537150ZJ—Ⅰ—C5838150ZJ—Ⅰ—A5739150ZJ—Ⅰ—A501616364G1/2″G3/8″40150ZJ—Ⅰ—A4841150ZJ—Ⅰ—C4242100ZJ—Ⅰ—A5043100ZJ—Ⅰ—A4644100ZJ—Ⅰ—A421313308G1/2″G3/8″45100ZJ—Ⅰ—A3946100ZJG—Ⅰ—B4247100ZJ—Ⅰ—A36G3/8″G1/2″48100ZJ—Ⅰ—A334980ZJ—Ⅰ—A521616364G1/2″G3/8″5080ZJ—Ⅰ—A421313308G1/2″5180ZJ—Ⅰ—A395280ZJ—Ⅰ—A361313308G3/8″5380ZJ—Ⅰ—A335465ZJ—Ⅰ—A301010226G1/4″5565ZJ—Ⅰ—A275650ZJ—Ⅰ—A501616364G1/2″G3/8″5750ZJ—Ⅰ—A461313308G1/2″G3/8″5850ZJ—Ⅰ—A331010226G1/4″5940ZJ—Ⅰ—A1788163G1/4″(5)Packing selection①packing material and choose Asbestos packing with mica should be often used when the working pressure of pump is less than and asbestos packing with ploytetrafluoroethylene should be used when the pressure is more than MPa. ②The type of packing see Table 2.③Packing Requirement The packing standard should be accord with stuffing box size, and from the direction of shaft, joints of the adjacent packing rings included 120176。（1）ZJ type Model and Meaning 200 ZJ – I – A 60 Impeller Dia.，cm The impeller vane ，A is B is C is F is G isH is 8. The Pump Stage，Ⅰas first stage，Ⅱas second stage； ZJ type slurry pump Pump Outlet Dia.，mm 2．ZJL Pump Structure Characteristics and Model（1）ZJL Pump Structure CharacteristicsZJL type slurry pump is mainly posed of the impeller and volute, back plate, shaft sleeve, support, support plate, shaft, bearing, bearing body parts, etc. The material of the impeller volute and back plate is high chrome alloy. The impeller and shaft connected by screw thread, the volute and support, bearing connected by bolted. Pump shaft and motor adopt coupling to direct drive or belt drive. The bearings ZJL pump adopt grease series of pump is no shaft seal. ZJL type pump structure as shown in figure 2. ZJL type Model and Meaning 80 ZJL – 36 Impeller Dia.，cm；