HOME   Cart(0)   Quotation   About-Us Tax PDFs Standard-List Powered by Google www.ChineseStandard.net Database: 189759 (2 Feb 2025)

JB/T 12843-2016 PDF English


Search result: JB/T 12843-2016 English: PDF (JB/T12843-2016)
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
JB/T 12843-2016English660 Add to Cart 0-9 seconds. Auto-delivery. Centrifugal refrigerant compressors Valid
BUY with any currencies (Euro, JPY, GBP, KRW etc.): JB/T 12843-2016     Related standards: JB/T 12843-2016

PDF Preview: JB/T 12843-2016


JB/T 12843-2016: PDF in English (JBT 12843-2016)

JB/T 12843-2016 JB MECHANICAL INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.200 J 73 Filing No.: 55150-2016 Centrifugal refrigerant compressors ISSUED ON: APRIL 05, 2016 IMPLEMENTED ON: SEPTEMBER 01, 2016 Issued by: Ministry of Industry and Information Technology of PRC Table of Contents Foreword ... 4 1 Scope ... 5 2 Normative references ... 5 3 Terms and definitions ... 6 4 Type and basic parameters ... 8 4.1 Type ... 8 4.2 Normal working pressure and flow range of the compressor (unit) ... 8 4.3 Nominal operating conditions ... 8 5 Requirements ... 8 5.1 General requirements ... 8 5.2 Safety requirements ... 9 5.3 Performance requirements ... 9 6 Test ... 11 6.1 General requirements for the test ... 11 6.2 Test methods ... 12 7 Inspection rules ... 14 7.1 Exit-factory inspection ... 14 7.2 Sampling inspection ... 14 7.3 Type inspection ... 14 8 Marking, packaging, transportation, storage ... 15 8.1 Marking ... 15 8.2 Packaging ... 16 8.3 Transportation and storage ... 17 Appendix A (Informative) Requirements for the layout of pressure, temperature measuring points and pipeline components for the refrigeration (heating) capacity test of the compressor (unit) ... 18 A.1 Overview ... 18 A.2 Requirements for the layout of suction and exhaust pressure and temperature measuring points ... 18 A.3 Requirements for the layout of straight sections of suction and exhaust pipes ... 19 Centrifugal refrigerant compressors 1 Scope This standard specifies the terms and definitions, types and basic parameters, requirements, tests, inspection rules, marking, packaging, transportation and storage of centrifugal refrigerant compressors and centrifugal refrigerant compressor units. This standard applies to centrifugal refrigerant compressors (hereinafter referred to as compressors) and centrifugal refrigerant compressor units (hereinafter referred to as compressor units) for air conditioning purposes. Centrifugal refrigerant compressors and centrifugal refrigerant compressor units for other purposes shall refer to this standard. 2 Normative references The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. GB/T 191 Packaging - Pictorial marking for handling of goods GB/T 5773 The method of performance test for positive displacement refrigerant compressors GB 6388 Transport package shipping mark GB 9237 Mechanical refrigerating systems used for cooling and heating - Safety requirements GB/T 9239.1-2006 Mechanical vibration - Balance quality requirements for rotors in a constant (rigid) state - Part 1: Specification and verification of balance tolerances GB/T 13306 Plates GB/T 18430.1 Water chilling (heat pump) packages using the vapor compression cycle - Part 1: Water chilling (heat pump) packages for industrial and commercial and similar application GB/T 19410 Screw refrigerant compressors prescribed procedures (or the agreement between the user and the manufacturer). 5.2 Safety requirements The safety requirements of the compressor (unit) shall comply with the provisions of GB 9237. 5.3 Performance requirements 5.3.1 Strength 5.3.1.1 Compressor housing and other pressure-bearing parts shall be subjected to strength tests. During the strength tests, there shall be no leakage or abnormal deformation in all parts. 5.3.1.2 When the compressor housing and other pressure-bearing parts are subjected to strength tests, the requirements are as follows: - If the test is a type inspection, the compressor housing and other pressure-bearing parts shall be subjected to a burst test of not less than 3 times the design pressure; - If the test is a sampling inspection, the compressor housing and other pressure- bearing parts shall be subjected to a hydraulic test of not less than 1.50 times the design pressure or a gas pressure test of 1.25 times the design pressure; - If the test is an exit-factory inspection, at least one sample of the basic model compressor housing and other pressure-bearing parts shall be subjected to a burst test of not less than 3 times the design pressure each year. After the test is passed, the strength test of each compressor (unit) for exit-factory inspection shall only be subjected to a hydraulic test of 1.25 times the design pressure or a gas pressure test of 1.15 times the design pressure for the compressor housing and other pressure- bearing parts. 5.3.2 Air tightness When conducting air tightness test, the requirements are as follows: - When the leak detection medium is dry, clean air or nitrogen, the compressor (unit) or compressor housing and other pressure parts shall be leak-free during the test; - When the leak detection medium is other test gases, the single-point leakage rate of the compressor (unit) or compressor housing and other pressure parts during the test shall not be greater than 14 g/a. 5.3.3 Operation The compressor (unit) shall be tested for operation; its operation shall be stable, without abnormal noise and severe vibration; the adjustment device shall be flexible and correct; the pressure, input power, temperature shall not fluctuate abnormally; the friction parts shall not have abnormal temperature rise. The unit assembled from the compressor that has passed the operation test does not need to be tested for operation. 5.3.4 Insulation resistance The insulation resistance between the live parts of the compressor (unit) and the non- live parts that may be grounded: the cold insulation resistance of the motor with a rated voltage below 1000 V shall not be less than 50 MΩ; the cold insulation resistance of the motor with a rated voltage of 1000 V ~ 6600 V shall not be less than 200 MΩ; the cold insulation resistance of the motor with a rated voltage greater than 6600 V shall not be less than 500 MΩ. 5.3.5 Impeller dynamic balance The dynamic balance level of the impeller shall comply with the requirements specified by the manufacturer's design or the agreement between the supplier and the buyer. 5.3.6 Impeller overspeed The permanent deformation of the key parts of the impeller (such as the shaft hole, the inlet seal ring, the outer diameter of the impeller), before and after the test, shall comply with the requirements specified by the manufacturer's design or the agreement between the supplier and the buyer. 5.3.7 Refrigeration (heating) capacity The measured refrigeration (heating) capacity of the compressor (unit) shall not be less than 95% of the nominal refrigeration (heating) capacity. 5.3.8 Input power The measured input power of the compressor (unit) shall not be greater than 110% of the nominal input power. 5.3.9 Refrigeration (heating) performance coefficient The measured refrigeration (heating) performance coefficient of the compressor (unit) shall not be less than 95% of the indicated value. 5.3.10 Vibration The measured vibration value of the compressor (unit) shall not be greater than the vibration limit indicated by the manufacturer. 5.3.11 Partial load operation condition parameters, the measuring instruments and accuracy shall comply with the provisions of GB/T 5773. 6.1.9 The refrigeration capacity test of a single-stage compressor (unit) shall include two test methods. The selection and combination of test methods and the deviation between the test results of the two test methods shall comply with the provisions of GB/T 5773. 6.1.10 The heating capacity test of various compressors (units) and the refrigeration capacity test of multi-stage compressors (units) may be carried out using only one test method. 6.2 Test methods 6.2.1 Strength test The methods of air pressure test, hydraulic test, burst test shall comply with the provisions of GB/T 19410. Note: For compressors (units) without safety valves, the burst test of the compressor housing and other pressurized parts shall be carried out at a pressure not less than 3 times the design pressure. 6.2.2 Air tightness test The method of air tightness test shall be in accordance with the provisions of GB/T 19410. 6.2.3 Operation test The operation test of the compressor (unit) shall be carried out on the operation test bench. Check the assembly quality of its operating parts and the lubrication condition of the lubrication system. If it does not meet the requirements, the defects shall be eliminated and the test shall be repeated, until it is qualified. The operation test of the compressor (unit) can also be carried out on the compressor performance test bench. 6.2.4 Insulation resistance test The method of insulation resistance test shall comply with the provisions of GB/T 18430.1. When conducting this test, the variable frequency compressor (unit) shall completely isolate the variable frequency system from the compressor. 6.2.5 Impeller dynamic balancing test Put the impeller on the dynamic balancing test machine for testing. Before the test, the impeller dynamic balancing test tooling shall be subjected to a dynamic balancing test separately. The balancing accuracy quality level shall meet the requirements of GB/T 9239.1-2006, which shall not be lower than G2.5. Clean the impeller and assemble the tooling in turn. Set the weight removal (addition) surface and weight removal (addition) radius, then start the dynamic balancing machine and record the unbalanced quality. 6.2.6 Impeller overspeed test The impeller overspeed test is carried out on the impeller overspeed test machine after the dynamic balance test is passed. The test speed is not less than 1.15 times the nominal speed of the compressor; the operation time is at least 1 min. 6.2.7 Refrigeration (heating) capacity test The test is carried out according to the nominal refrigeration (heat pump) working conditions specified in 4.3 and the method specified in Appendix C. 6.2.8 Input power test At the same time as the test in 6.2.7 of this standard, the input power and working current of the compressor (unit) are measured and calculated, according to the method specified in GB/T 5773. 6.2.9 Refrigeration (heating) performance coefficient test At the same time as the test in 6.2.7 of this standard, the refrigeration (heating) performance coefficient of the compressor (unit) is measured and calculated according to the method specified in GB/T 5773. 6.2.10 Vibration test Measure the vibration value of the compressor (unit) according to the method specified in GB/T 19410. For semi-enclosed compressors, the motor end bearing position measurement point is also required. 6.2.11 Partial load operation test Under the nominal refrigeration (heat pump) working condition specified in 4.3 of this standard, determine the partial load test working condition according to the inherent characteristics of the compressor (unit) energy regulating device; conduct the test according to the method specified in Appendix C of this standard and GB/T 5773, to determine the refrigeration (heating) capacity and input power. 6.2.12 Full performance test The test organization determines the full performance test working condition according to the typical characteristic curve according to the method specified in Appendix C of this standard and GB/T 5773; conducts a full performance test; determines the actual speed, inlet volume flow, pressure ratio (or pressure increase), input power or efficiency. buttons, etc.) and safety signs (such as grounding devices, warning signs, etc.). 8.2 Packaging 8.2.1 The compressor (unit) shall be cleaned, dried, rust-proofed before packaging; then filled with 0.03 MPa ~ 0.05 MPa (gauge pressure) of dry nitrogen or corresponding refrigerant gas (unless otherwise it is dangerous). 8.2.2 The compressor (unit) packaging shall be provided with accompanying documents. Accompanying documents include product certificates, product manuals, packing lists, etc., which shall be moisture-proof and sealed, to ensure that they will not be damaged or damp during normal storage and transportation; it shall include the following contents: a) The contents of the product certificate include: - Product model and name; - Product number; - Manufacturer name and trademark; - Inspection conclusion; - Signature and date of the inspector and the person in charge of inspection. b) The contents of the product manual include: - Product model and name, scope of application, implementation standard number; - Specifications and main technical parameters [refrigeration (heating) capacity, input power, performance coefficient, rated working current, vibration value, typical characteristic curve, etc.]; - Product structural diagram, refrigeration system diagram, wiring diagram; - Installation instructions and requirements; - Instructions for use, repair and maintenance precautions. 8.2.3 The following marks shall be on the compressor (unit) packaging box: - Shipping station and manufacturer name; - Arrival station and receiver name; - Product model and name; Appendix A (Informative) Requirements for the layout of pressure, temperature measuring points and pipeline components for the refrigeration (heating) capacity test of the compressor (unit) A.1 Overview This Appendix specifies the requirements for the layout of pressure, temperature measuring points and pipeline components for the refrigeration (or heating) capacity test of the compressor (unit). A.2 Requirements for the layout of suction and exhaust pressure and temperature measuring points A.2.1 The layout of suction and exhaust pressure and temperature measuring points shall meet the requirements of Figure A.1 and comply with the provisions of Tables A.1 and A.2. At the same time, the insertion depth of the temperature measuring instrument shall not be less than 1/3 of the pipe diameter. The specific requirements are as follows: a) The suction pressure of the compressor (unit) is the average of the data of the three pressure measuring holes, which are evenly distributed along the circumferential direction on the same section of the suction pipeline. The straight pipe section length between the section where the pressure measuring hole is located and the suction flange of the compressor is at least 0.6 m; b) The suction temperature of the compressor (unit) is the average of the data of the three temperature measuring holes, which are evenly distributed along the circumferential direction on the same section downstream of the pressure measuring hole on the suction pipeline. Each temperature measuring hole should be staggered 30° from the pressure measuring hole at the same distance. The straight pipe section length -- between the section where the temperature measuring hole is located and the section where the pressure measuring hole is located -- is at least 0.3 m; c) The exhaust pressure of the compressor (unit) is the average of the data of the three pressure holes, which are uniformly distributed along the circumferential direction on the same section of the exhaust pipeline. The straight pipe section length -- between the section where the pressure hole is located and the exhaust flange of the compressor -- is at least 0.3 m; C.2.2 Test procedure C.2.2.1 The suction pressure of the compressor (unit) is regulated by the refrigerant gas regulating valve (see Figure C.1c) and Figure C.2c] or by the expansion valve (see Figure C.3 or Figure C.4). C.2.2.2 The exhaust pressure of the compressor (unit) is adjusted by changing the cooling water volume or cooling water temperature of the condenser, or by the pressure control valve in the exhaust pipe. C.2.2.3 The suction temperature of the compressor (unit) is adjusted by the liquid expansion valve [see Figure C.1c) and Figure C.2c)] or by the evaporator heating medium and the refrigerant flow rate of the refrigerant injection branch (see Figure C.3 or Figure C.4). C.2.2.4 When testing the compressor (unit) equipped with a flasher, the refrigerant liquid temperature before the expansion of the air supply circuit is adjusted by an auxiliary subcooling or heating device. C.2.2.5 Additional data are as follows: - Refrigerant gas pressure and temperature before (after) the flowmeter; - Pressure drop of the flowmeter; - Refrigerant mass flow rate of the injection branch of the suction pipeline; - Exhaust temperature of the compressor (unit) - Refrigerant pressure at the outlet of the flasher air supply circuit of the [multi-stage compressor (unit)]; - Refrigerant mass flow rate at the outlet of the flasher air supply circuit of the [multi- stage compressor (unit)]; - Refrigerant mass flow rate of the lubricating oil cooling branch, motor cooling branch, inverter and its box cooling branch. C.2.3 Refrigerant flow calculation C.2.3.1 Test method D1 The refrigerant flow rate entering the evaporator of the refrigeration cycle where the compressor (unit) is located, which is measured by the test method D1, is calculated according to formula (C.8). - Refrigerant liquid temperature at the inlet of the subcooler and the inlet of the flowmeter; - Refrigerant saturation temperature (or bubble point temperature) corresponding to the outlet pressure of the flowmeter; - Refrigerant mass flow rate of the injection branch of the suction pipeline; - Compressor (unit) exhaust temperature; - Refrigerant pressure at the outlet of the flasher air supply circuit of [Multi-stage compressor (unit)]; - Refrigerant mass flow rate at the outlet of the flasher air supply circuit of [Multi- stage compressor (unit)]; - Refrigerant mass flow rate of the lubricating oil cooling branch, motor cooling branch, inverter and its box cooling branch. C.3.4 Calculation of refrigerant flow rate The refrigerant flow rate entering the evaporator of the refrigeration cycle where the compressor (unit) is located, as measured by method F test, is calculated according to formula (C.11). The mass flow rate of refrigerant flowing through the exhaust side of the compressor (unit), as measured by method F test, is calculated according to formula (C.3). C.4 Test method G: Water-cooled condenser calorimeter method C.4.1 Construction The water-cooled condenser is one of the pieces of equipment that constitutes the test system of the tested compressor (unit). According to the provisions of 6.1.5, instruments for measuring temperature, pressure and cooling water flow are set as calorimeters. The heat leakage of the condenser as a calorimeter shall not exceed 5% of the refrigeration capacity of the compressor. In order to control the refrigerant suction of the compressor (unit) to a low superheat state, a refrigerant injection branch is connected to the suction pipe of the compressor (unit) [see (b) in Figure C.4]. C.5.2 Leakage heat calibration The leakage heat calibration is carried out according to the calibration method specified in GB/T 5773. C.5.3 Test procedure The refrigerant flow entering the gas cooler through the condensation branch is regulated by the control valve at the gas cooler inlet on the branch, so that the evaporation rate of the refrigerant liquid in the gas cooler is equal to the condensation rate of the refrigerant in the condenser (a). The condensation pressure can be regulated by the pressure control valve between the exhaust pipe and the condenser, or by changing the cooling water volume, heat exchange area or cooling water temperature. The compressor suction pressure is regulated by the gas cooler inlet flow control valve on the exhaust pipe. The compressor suction superheat is regulated by the liquid flow control valve entering the gas cooler and the refrigerant injection flow control valve on the suction pipe. When the compressor (unit) equipped with a flasher is tested, the refrigerant liquid temperature before the expansion of the air supply circuit is regulated by an auxiliary subcooling or heating device. After reaching the suction and exhaust pressures and suction temperatures specified in the test conditions [as well as the refrigerant gas pressure and temperature at the flasher outlet of the multi-stage compressor (unit)], start recording data. During the test, the change in the calculated refrigeration capacity caused by the flow fluctuation of the refrigerant liquid shall be less than 1%. C.5.4 Additional data The additional data are as follows: - Refrigerant gas pressure and temperature at the outlet of the gas cooler; - Refrigerant liquid pressure and temperature before expansion entering the gas cooler; - Refrigerant gas pressure and temperature at the inlet of the gas cooler; - Surface temperature of the gas cooler; - Ambient temperature of the gas cooler; - Mass flow rate and temperature of the condensed refrigerant liquid entering the gas cooler; - Refrigerant mass flow rate of the injection branch of the suction line; ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.