【正文】 eter of suction pipeline should be equal to pump inlet or larger than it so as to avoid cavitation and deposition of slurry in pipeline. Gate valve of suction pipeline: In order to maintain easily, we should install inlet gate valves whose diameter is equal to the diameter of suction pipeline. The expansion pipe should be set up between inlet of pump and suction pipeline so as to disassemble pump. ② Discharge pipeline Diameter 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 pipeline The 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). 13 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 watercooling Packing 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 pipeline 14 The pressure of shaft seal water should be puted according as the following formula. Table 1 Pressure and Capacity of shaft seal water Sealing Type The 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 （Ⅰ stage pump) Pi’ = 1~ ~2 2~3 3~5 Packing Seal Pi’ =(i1/3)P Mechanical Seal Pi’ =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 m3 /h. The type of watercooling see Table 2. 15 Table 2 Type of Packing, watersealing and watercooling No. Model Packing Specification (mm) ssssSsSSpecificatioSpecificationpecification Specification （ mm） (mm) Shaft Seal Pipe Joint Cooling Water Pipe Joint 1 300ZJ— Ⅰ — A100 22 22 636 G3/4″ G1/2″ 2 300ZJ— Ⅰ — A95 3 300ZJ— Ⅰ — A90 22 22 605 G3/4″ G1/2″ 4 300ZJ— Ⅰ — A85 5 300ZJ— Ⅰ — A70 19 19 502 G1/2″ G1/2″ 6 300ZJ— Ⅰ — A65 7 300ZJ— Ⅰ — A56 8 250ZJ— Ⅰ — A103 22 22 605 G3/4″ G1/2″ 9 250ZJ— Ⅰ — A96 10 250ZJ— Ⅰ — A90 11 250ZJ— Ⅰ — A85 12 250ZJ— Ⅰ — A83 13 250ZJ— Ⅰ — A80 14 250ZJ— Ⅰ — A78 15 250ZJ— Ⅰ — A75 19 19 502 G1/2″ G1/2″ 16 250ZJ— Ⅰ — A73 17 250ZJ— Ⅰ — A70 18 250ZJ— Ⅰ — A68 19 250ZJ— Ⅰ — A65 20 250ZJ— Ⅰ — A63 21 250ZJ— Ⅰ — A60 22 200ZJ— Ⅰ — A85 22 22 605 G3/4″ G1/2″ 23 200ZJ— Ⅰ — A75 19 19 502 G1/2″ G1/2″ 16 24 200ZJ— Ⅰ — A73 25 200ZJ— Ⅰ — A70 19 19 455 G1/2″ G1/2″ 26 200ZJ— Ⅰ — A68 27 200ZJ— Ⅰ — A65 28 200ZJ— Ⅰ — A63 29 200ZJ— Ⅰ — A60 30 200ZJ— Ⅰ — A58 31 150ZJ— Ⅰ — A70 32 150ZJ— Ⅰ — A65 33 150ZJ— Ⅰ — A63 34 150ZJ— Ⅰ — A60 35 150ZJ— Ⅰ — A58 36 150ZJ— Ⅰ — A55 37 150ZJ— Ⅰ — C58 38 150ZJ— Ⅰ — A57 39 150ZJ— Ⅰ — A50 16 16 364 G1/2″ G3/8″ 40 150ZJ— Ⅰ — A48 41 150ZJ— Ⅰ — C42 42 100ZJ— Ⅰ — A50 43 100ZJ— Ⅰ — A46 44 100ZJ— Ⅰ — A42 13 13 308 G1/2″ G3/8″ 45 100ZJ— Ⅰ — A39 46 100ZJG— Ⅰ — B42 47 100ZJ— Ⅰ — A36 G3/8″ G1/2″ 48 100ZJ— Ⅰ — A33 49 80ZJ— Ⅰ — A52 16 16 364 G1/2″ G3/8″ 50 80ZJ— Ⅰ — A42 13 13 308 G1/2″ 17 51 80ZJ— Ⅰ — A39 52 80ZJ— Ⅰ — A36 13 13 308 G3/8″ 53 80ZJ— Ⅰ — A33 54 65ZJ— Ⅰ — A30 10 10 226 G1/4″ 55 65ZJ— Ⅰ — A27 56 50ZJ— Ⅰ — A50 16 16 364 G1/2″ G3/8″ 57 50ZJ— Ⅰ — A46 13 13 308 G1/2″ G3/8″ 58 50ZJ— Ⅰ — A33 10 10 226 G1/4″ 59 40ZJ— Ⅰ — A17 8 8 163 G1/4″ (5)Packing selection ① packing 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. ② The type of packing see Table 2. ③ Packing 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 is H is 8. The Pump Stage，Ⅰ as first stage，Ⅱ as second stage； ZJ type slurry pump Pump Outlet Dia.， mm 5 2． Z