Analysis and Comparison of Common Standards for Petrochemical Centrifugal Pumps
The centrifugal pump has many advantages such as wide performance range, uniform flow, simple structure, reliable operation and convenient maintenance. Therefore, the centrifugal pump is working. It is the most widely used in industrial production. According to statistics, in petroleum and chemical plants, the use of centrifugal pumps accounts for 70-80% of the total pump. In addition to the reciprocating pump for high pressure and small flow, it is necessary to use a metering pump for metering, a vortex pump or a positive displacement pump (reciprocating pump or rotor pump) for liquid gas, and a rotor pump for conveying viscous medium. . Therefore, it is necessary to understand and master the common standards of centrifugal pumps, and to select the standards according to different devices and different working conditions, so that the centrifugal pumps can meet the requirements of long-term, safe operation and energy-saving. 1 standard description In the petroleum and chemical industries, the most widely used international standards for centrifugal pumps are API610, ISO5199 and ANSIB73.1M/B73.2M. The domestic standards are GB3215 and GB5656/T. These standards are described separately below. 1.1 API, short for American Petroleum Institute (American Petroleum Association). The purpose of the API610 standard is to provide a procurement specification for the manufacture and procurement of centrifugal pumps. API610 (seventh edition) is proposed for centrifugal pumps for petroleum refineries, and its standard name is "Centrifugal Pumps for General Refinery Services". But in fact, the API610 standard is not only used in petroleum refineries, but also in the petroleum, chemical, natural gas and other fields. In order to meet this need, API 610 (eighth edition), which was promulgated in 1995, was renamed "Centrifugal Pumps for Petroleum, Heavy Chemical and Gas Industry" and has a larger change in content than the previous edition. . API610 has received much attention for energy conservation issues. API 610 requires manufacturers and utilities to actively seek innovative energy-saving methods in the manufacturing, selection and operation of equipment. If this method of energy conservation improves efficiency and reduces the total cost of use without sacrificing safety or reliability, it should be encouraged. In addition, the evaluation criteria when selecting equipment shall be based on the total cost of the equipment during its service life, not the purchase cost of the equipment. Currently in the petroleum and chemical industry, API610 is the most frequently used international standard for centrifugal pumps. The International Organization for Standardization has also adopted the API610 standard, which is based on the standard number ISO/CD13709. 1.2ISO5199 ISO is the abbreviation of International Organization for Standardization. ISO5199TechnicalSpecificationforCentrifugalPumps, Class II (centrifugal pump specification II), mainly based on the German DIN standard. Its dimensions and performance are in accordance with ISO2858; the base conforms to ISO3661; the cavity size for mechanical seals or soft fillers conforms to ISO3069; the performance test class B conforms to ISO3555, and the C class conforms to ISO2548. China's GB5656, Germany's DINISO5199, France's NFISO5199 equivalent to ISO5199; Britain's BS6836 equivalent to ISO5199. China GB5662, Germany's DIN24256, Britain's BS5257, France's NFE44121, equivalent or equivalent to ISO2858. 1.3ASMEB73.1M/B73.2M ASME is the abbreviation of The American Society of Mechanical Engineers. 0b2l5L0{9U$DASMEB73.1M-1991Specification forHorizontalEndSuctionCentrifugalPumpsforChemicalProcess and ASMEB73.2M-1991Specification for Vertical In-lineCentrifugal PumpsforChemicalProcess are American national standards, jointly prepared by pump manufacturers and chemical production plants. A pump that meets these two criteria, called an ANSI pump. The remaining ASME chemical pump standards are: ASMEB73.3M-1996SpecificationforThermoplasticalandThmosetPolymerMaterialHorizontalEndSuctionCentrifugalPumpsforChemicalProcess (Horizontal axial suction thermoplastic, thermosetting resin chemical centrifugal pump). ASMEB73.5M-1995SpecificationforSeallessHorizontalEndSuctionCentrifugalPumpsforChemicalProcess (Horizontal axial suction leak-free chemical centrifugal pump). 1.4GB3215 China National Standard GB3215-89 "General Technical Conditions for Centrifugal Pumps for Refinery, Chemical and Petrochemical Processes" is basically prepared with reference to API610 version 6. 1.5GB5656/T China National Standard GB5656/T-94 "Technical Conditions for Single-stage, Single-suction Chemical Centrifugal Pumps" was prepared in accordance with ISO5199. The relevant standards such as GB5662 "Axial suction centrifugal pump (16Bar) marking, performance and size" refer to ISO2858, GB5661 "Cylinder size for axial suction centrifugal pump mechanical seal and soft filler" refer to ISO3069, GB5660 "axial suction centrifugal Pump base and mounting dimensions refer to ISO3661. The hydraulic performance test is carried out according to Grade C or B of GB3216 "Test Methods for Centrifugal Pumps, Mixed Flow Pumps, Axial Flow Pumps and Vortex Pumps" (refer to ISO2548, ISO3555). 2 standard comparison 2.1 ISO pump and ANSI pump ISO5199 (including national standards equivalent to or refer to the standard, such as China's GB/T5656), ANSIB73.1M/B73.2M standard for medium and light load petroleum, chemical centrifugal pumps, drive machines and auxiliary equipment in the design and manufacture Basic requirements for inspection, testing, and delivery status. The scope and requirements of the two types of standards are basically the same, and the applicable parameter ranges are as follows: (1) rated discharge pressure ≤ 1.96MPa (G); (2) medium temperature <260 ° C; (3) The drive machine power is ≤110kW; (4) Maximum speed <3600r/min; (5) rated head ≤ 120m; (6) The maximum suction pressure ≤ 0.5MPa (G); (7) The maximum impeller diameter is ≤ 333mm. A chemical centrifugal pump conforming to ISO 5199 (including national standards equivalent to or referring to the standard) is called an ISO pump; a chemical centrifugal pump conforming to the ANSI B73.1M/B73.2M standard is called an NSI pump. among them: (1) ISO 5199 (including national standards equivalent or refer to the standard) applies to horizontal cantilever centrifugal pumps; (2) The ASMEB73.1M standard is only applicable to horizontal cantilever centrifugal pumps with foot mounting; (3) The ASMEB73.2M standard applies to vertical pipeline centrifugal pumps, namely OH3, OH4, OH5 in Table 1. ISO pumps or ANSI pumps have lower requirements for materials, design, manufacturing, and testing than API pumps, so reliability is relatively poor, and of course the price is much cheaper. These pumps meet the requirements of general chemical applications and are often used in applications where flammability and hazards are not critical. DURCO's MARKIII series, GOULDS's 3196 series, Switzerland's Sulzer and Dalian acid-resistant pump plant's CZ series, Japan's EBW's IFW, IFS series and China's IH series (including improved series) are all such Pump. 2.2API610 API610 imposes minimum requirements on centrifugal pumps for the petroleum, heavy chemical and natural gas industries, including pumps used for reverse operation as hydraulic recovery turbines. Centrifugal pumps that conform to the API610 standard are often referred to as API pumps. The API pump has a continuous cycle of at least 3 years and is highly reliable. API pumps are used in a wide range of applications, including three types of pumps, namely Overhung, BetweenBearings and Vertical Suspended. As shown in Table 1. Among them, OH1, OH4 and OH5 can only be provided when the buyer's designation and manufacturing factory have proved that they have experience in this type of pump. US SINGLOL-RAND-PUMPS SVCN7 (single stage horizontal pump), GOULDS 3700 (single stage horizontal pump), 3900 (pipe pump), Swiss Sulzer and Dalian acid pump factory ZA, ZE, ZF , ZU (single stage horizontal pump), ETL (pipe pump), UCW (single stage horizontal pump) of Japan Ebara Co., Ltd., SJA (single stage horizontal pump) of Shenyang Pump Factory are all API cantilever pumps ( OH2 or OH3). Taking Sulzer's ZA, ZE, ZF, and ZU series as examples, the applicable parameter ranges are as follows: (1) rated discharge pressure ≤ 15MPa (G); (2) Medium temperature - 112 ~ 400 ° C; (3) rated head ≤ 300m; (4) The maximum impeller diameter is ≤ 630mm. For non-flammable, non-hazardous media, API610 specifies: when the pump inlet pressure <0.5MPa (gauge pressure), outlet pressure <1.9MPa (gauge pressure), pumping temperature <150 °C, speed <3600r/min, rated head <120m, when the impeller diameter (cantilever pump) <330mm, the entire standard conforming to API610 is not required. However, in terms of service life, material, shaft stiffness, mechanical seal, bearing, auxiliary piping, etc., it should meet the relevant requirements of API610, and the buyer should specify in the inquiry sheet which requirements can be relaxed. 2.3 How to choose the standard of centrifugal pump In the field of petroleum and chemical industry, how to choose the standard of centrifugal pump according to the working conditions of the device and pump is of great significance. When the parameters of the centrifugal pump are medium and light load, that is, the suction pressure is ≤0.5MPa (G), the discharge pressure is ≤1.96MPa (G), the medium temperature is <260°C, the rated lift is ≤120m, and the drive power is ≤110Kw, In the case, it is better to use the API610 pump. #Rw&h0v'Uo#Q (1) When the medium delivered by the centrifugal pump is particularly flammable or dangerous; (2) When the pump is not equipped and the reliability is high; (3) When the continuous operation cycle of the pump is required to be long. In addition, the use of ISO5199 pumps or ANSI pumps can reduce equipment purchase costs. When the centrifugal pump is out of the medium and light load range, the centrifugal pump of API610 standard can be used to ensure the performance and reliability. 3 standard column comparison In order to facilitate the comparison of API610 (only cantilever pump), GB/T5656 (refer to ISO5199), ANSIB73.1M/B73.2M standards, the contents of the relevant columns are listed in the form of a table. (Editor: Global Hardware Network) Steel Measuring Tape,Tape Line Measure,Magnet Tape Measure,Rubber Tape Line Measure Shangqiu Hengli Measuring Tools Co.,Ltd , https://www.jjmtools.com