This standard specifies the types and basic parameters of self-priming centrifugal pumps. This standard applies to pumps that transport clean water, liquid food, gasoline, kerosene, diesel and corrosive liquids. The maximum temperature of the transported liquid is 80°C. JB/T 7256-1994 Types and basic parameters of self-priming centrifugal pumps JB/T7256-1994 Standard download decompression password: www.bzxz.net
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Mechanical Industry Standard of the People's Republic of China JB/T7256-94 Types and basic parameters of self-priming centrifugal pumps Published on July 18, 1994 Ministry of Machinery Industry of the People's Republic of China Implementation on July 1, 1995 Mechanical Industry Standard of the People's Republic of China Types and basic parameters of self-priming centrifugal pumps Subject content and scope of application This standard specifies the types and basic parameters of white-suction centrifugal pumps (hereinafter referred to as pumps). This standard is applicable to pumps for conveying clean water, liquid food, gasoline, kerosene, diesel and corrosive liquids. The maximum temperature of the conveyed liquid is 80℃. The specified working pressure is 0.6MPa when H≤50m and 1MPa when H>50m. 2 Type is horizontal, single-stage single-suction cantilever type, 3 Model Model indication method: Head, m Flow, m/b JB/T7256-94 Conveying medium: S-liquid food: Y-light oil: F-corrosive liquid; clean water is not indicated Type, N-internal mixing; external mixing is not indicated Self-priming centrifugal pump Mark Example: Flow rate 12.5m*/h, head 32m external mixing self-priming centrifugal clean water pump Z12.5-32 Flow rate 50m/h, head 40m, internal mixing self-priming centrifugal pump for conveying light oil products: ZNY50-40 4 Basic parameters 4.1 The performance parameters of the pump at the specified point shall comply with the provisions of Table 1. The values in the table are the performance parameters for clean water at room temperature. The performance working range of the system is shown in Figure 1. 4.2 When stainless steel materials are used, the efficiency of the pump is reduced by 3 percentage points according to the values in Table 1, and the self-priming time t shall meet the following conditions: 4.3 The self-priming height shall comply with the provisions of Table 2; The inner diameter of the suction pipe of the pump shall be the same as the diameter of the suction port: The length of the horizontal section of the suction pipe shall not exceed 0.5m: The effective length of the suction pipe shall be greater than the specified self-priming height, but shall not exceed 0.5m. Approved by the Ministry of Machinery Industry on July 18, 1994 Implemented on July 1, 1995 JB/T 725694 /1 00t k 0062* /1 0062 Z1. 6-12. 5 Z2. 2-12. 5bzxZ.net ZA,5-12. 5 Z12. 5-12.5 Suction port Discharge port JB/T 7256-94 Drinking Residual Amount Self-priming Time Z18-10 Z18-16 Z18-20 Z18-25 Z18-32 Z18-40 Z18-50 Z25-10 Z25-12. 5 | |tt | |tt||Z36-32 Z 36-40 | |tt | |tt||Discharge outlet JB/T 725694 Continued Table 1 Cavitation balance Self-priming time Z50-80 Z71-16 Z71-20 Z71-25 Z71-32 Z71-40 Z71-50 Z71-63 Z71-80 Z100- 20 | | tt | | Z100-25 | t||Z140-63 Z140-80 Z200 -50 Z200-63 Z140-32 2140-40 Z140-50 Z140-63 Z140-80 Z200-50 Z200-63 Z200-80 Suction port Discharge port Note: When equipped with a single-phase motor, the Speed is 2820r/minJB/T7256--94 Continued Table 1 Erosion margin Self-priming time Self-priming height Rotation direction JB/T7256-94 >100~140 >140~200 From the driving end, the specified case is clockwise rotation, and it can also be made counterclockwise when necessary. Additional remarks: This standard was proposed and coordinated by Shenyang Water Pump Research Institute. This standard was drafted by Shenyang Water Pump Research Institute. The main drafter of this standard is Zhou Shaopo, Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.