According to incomplete statistics, there are 750-800 "machines" such as compressors, fans, steam turbines, gas turbines, refrigerators and expanders; over 860 "pumps"; over 60 "centrifuges" "Sealing" standard more than 230, the total number of standards in 2000 or more. The above statistics are limited to China's national standards, industry standards, international ISO standards and national standards of the United States, Britain, Japan, Germany, France and other countries and two U.S. industry standards (Institute of Mechanical Engineers standards and American Petroleum Institute standards). Local and enterprise standards at all levels and various national standards in other countries are not included. The standard provides a very wide range of organic pump products, basic types and parameters, performance, terminology, marking, evaluation, size, general technical conditions, test methods, construction procedures, acceptance criteria, measurement methods, grading and so on, Generally can be summarized as the design, manufacture, installation and acceptance of three aspects. Some are some of the pump parts such as valves, castings, couplings of the standard or some performance requirements, such as vibration, noise, lubrication standards and so on. The standards involved in the product range is also very large, to the pump, for example, centrifugal pumps, metering pumps, screw pumps, reciprocating pumps, turbine pumps, submersible pumps, pumps, pumps, pressure test pump, Pump, pump, chemical pump, pump, pump, chemical pump, pump, pump, pump, pump, pump, pump Pumps, leak-free pumps, plastic pumps, fire pumps, etc., there are many. Some of its name is divided according to the conventional pump classification methods such as vane pumps, positive displacement pumps, while others are divided by purpose, such as sewage pumps, sanitation pumps, some names are more arbitrary, such as diffusion pumps, liquid nitrogen pumps. As long as the production of such products, there is a need to develop standards, through a certain application, approval process may produce a new standard, but sometimes the content is quite cross, repeat. In terms of domestic and foreign standards, the number of domestic standards is more than that of foreign standards. In general, centrifugal pumps are used for a wide range of applications. Pumps with a long history of production have more standard pumps (the total number of centrifugal pumps has reached more than 100), and the rapid development of new pump standards such as leak-free pumps Then less. There are currently 7 standards for leak-free pumps, of which 3 are foreign and 4 are domestic. They are: ASME / ANSI B73.3M-1997 SPECIFICATION FOR SEALLESS HORIZON-TAL END SUCTION CENTRIFUGAL PUMPS FOR CHEMICAL PROCESS Chemical Inhalation Non-Leakage Centrifugal Pumps Specifications API STD 685-2000 SEALLESS CENTRIFUGAL PUMPS FOR PETROLEUM, HEAVY DUTY CHEMICAL, AND GAS INDUSTRY SERVICES Non-Leakage Centrifugal Pumps for Petroleum, Heavy Chemical and Gas Industries VDMA24279-1993 SEALLESS CENTRIFUGAL PUMPS Non-Leakage Centrifugal Pumps HG / T 2730- 1995 Magnetic Centrifugal Chemical Process Pump JB / T 7742-1995 Small Magnetic Drive Centrifugal Pump JB / T 8400-1996 Non-Leakage Magnetic Drive Plastic Self-Priming Pump JB / T 53304-1999 Small Magnetic Drive Centrifugal Pump Product Quality Points Note: ASME is short for The American Society of Mechanical Engineers; VDMA is short for the German Engineering Federation. Compressor standards include compressors, fans, steam turbines, gas turbines, refrigerators and other standards, the general number shown in Table 1. It can be seen from Table 1 that the number of domestic standards is obviously more than that of foreign standards. Table 1: Compressors Standard Number Compressor Fan Turbine Gas Turbine Chiller Total China National Standard GB 40 10 17 21 2 90 China Industry Standard JB et al 123 44 108 26 23 324 International Organization for Standardization ISO 26 8 3 19 56 American National Standards Institute British Standard Institute BS 37 8 8 15 3 71