HOME   Cart(0)   Quotation   About-Us Policy PDFs Standard-List
www.ChineseStandard.net Database: 189760 (18 Oct 2025)

JB/T 12843-2016 PDF English

US$660.00 · In stock · Download in 9 seconds
JB/T 12843-2016: Centrifugal refrigerant compressors
Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
Status: Valid
Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
JB/T 12843-2016English660 Add to Cart 0-9 seconds. Auto-delivery Centrifugal refrigerant compressors Valid

Excerpted PDFs (Download full copy in 9 seconds upon purchase)

PDF Preview: JB/T 12843-2016
      

Similar standards

GB/T 10870   SB/T 10794.2   JB/T 12840   

JB/T 12843-2016: Centrifugal refrigerant compressors

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JBT12843-2016
JB MECHANICAL INDUSTRY STANDARD 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 Appendix B (Informative) Technical requirements for rectifiers used in compressor (unit) performance test equipment... 21 B.1 Overview... 21 B.2 Structure... 21 B.3 Installation method... 22 Appendix C (Normative) Refrigeration (heating) capacity test method of compressor (unit)... 24 C.1 Overview... 24 C.2 Test methods D1 and D2.Refrigerant gas flow meter method... 26 C.3 Test method F. Refrigerant liquid flow meter method... 30 C.5 Test method J. Refrigerant gas cooling method... 34 C.6 Test method K. Calorimeter method for compressor exhaust pipe... 37 Appendix D (Informative) Symbols and definitions used in the formula... 40

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the China Machinery Industry Federation. This standard shall be under the jurisdiction of the National Technical Committee for Standardization of Refrigeration and Air-conditioning Equipment (SAC/TC 238). The responsible drafting organizations of this standard. Hefei General Machinery Research Institute, Zhuhai Gree Electric Appliances Co., Ltd., Trane Air Conditioning Systems (China) Co., Ltd., Shanghai Hanzhong Precision Machinery Co., Ltd., Hefei General Environmental Control Technology Co., Ltd., Hefei General Electromechanical Products Testing Institute Co., Ltd. The participating drafting organizations of this standard. Danfoss Automation Control Management (Shanghai) Co., Ltd., Zhejiang Dun'an Artificial Environment Co., Ltd. The main drafters of this standard. Zhang Xiuping, Zhang Zhiping, Zhang Weijia, Deng Zhuang, Wang Rujin, Liu Fulai, Liu Hongshao, Pan Zudong, Zan Shichao, Song Youqiang. This standard was published for the first time. 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

3 Terms and definitions

The terms and definitions as defined in JB/T 7249, as well as the following terms and definitions, apply to this document. 3.1 Centrifugal refrigerant compressor A compressor that relies on the impeller to do work on the refrigerant vapor to increase the pressure and velocity of the refrigerant vapor, then converts the kinetic energy into pressure energy in the diffuser, so that the refrigerant vapor flows radially through the impeller. 3.2 Centrifugal refrigerant compressor unit A unit assembled from a centrifugal refrigerant compressor, a prime mover and other accessories, used to compress refrigerant vapor. 3.3 Surging An instability phenomenon that occurs during the operation of a compressor (unit), characterized by large fluctuations in the refrigerant vapor flow rate over time, accompanied by strong vibrations and noise. 3.4 Choking An instability phenomenon that occurs during the operation of a compressor (unit), characterized by gas dynamic blockage, when the refrigerant vapor flow rate no longer increases with the action of the regulating mechanism.

4 Type and basic parameters

4.1 Type 4.1.1 According to the structure, it is divided into open type and semi-closed type. 4.1.2 According to the number of stages, it is divided into single stage, double stage, multi-stage. 4.3 Nominal operating conditions The nominal operating conditions of the compressor (unit) shall be as specified in Table 1.

5 Requirements

5.1 General requirements The compressor (unit) shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the 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 5.3.2 Air tightness When conducting air tightness test, the requirements are as follows. 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. 5.3.7 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 The compressor (unit) shall be subjected to partial load operation test; its refrigeration (heating) capacity and input power under partial load shall be measured; a partial load performance curve or performance table shall be drawn. 5.3.13 Winding temperature The measured motor winding temperature of the compressor (unit) shall not be higher than the winding temperature limit specified by the manufacturer.

6 Test

6.1 General requirements for the test 6.1.1 The compressor (unit) test device shall exclude non-condensable gases in the test system. Confirm that there is no refrigerant leakage. 6.1.2 The liquid pipeline and suction pipeline of the compressor (unit) test device shall be thermal-insulated. 6.1.8 The test cycle and data collection requirements, the allowable deviation of the test 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. 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. 6.2.7 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. 6.2.13 Winding temperature test After the compressor (unit) runs at the maximum value of the motor design power for 15 minutes, record the temperature data measured by the embedded temperature sensor in the motor winding; record it every 5 minutes, until the measured data is stable.

7 Inspection rules

7.1 Exit-factory inspection Each compressor (unit) shall be subject to the exit-factory inspection; the inspection items shall be in accordance with the provisions of Table 2.If the exit-factory inspection has been completed at the supplier, the corresponding inspection and test report can be provided instead. 7.2 Sampling inspection 7.3 Type inspection 7.3.1 If a new product or a finalized product undergoes major improvements, the first product shall undergo type inspection; the inspection items shall be in accordance with the provisions of Table 2. 7.3.2 If a compressor (unit) fails during test operation, it shall be re-inspected after the fault is eliminated.

8 Marking, packaging, transportation, storage

8.1 Marking 8.1.1 Each compressor (unit) shall have a permanent nameplate fixed in a conspicuous position; the nameplate shall comply with the provisions of GB/T 13306.The following information shall be marked on the nameplate. 8.1.2 The compressor (unit) shall be provided with signs indicating the operating status (such as the rotation direction of the compressor impeller, indicator instruments, control 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. 8.3 Transportation and storage 8.3.1 The compressor (unit) shall not collide, tilt, or be exposed to rain or snow during transportation and storage. 8.3.2 The packaged compressor (unit) shall be stored in a dry and well-ventilated warehouse. JB/T 12843-2016 JB MECHANICAL INDUSTRY STANDARD 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 Appendix B (Informative) Technical requirements for rectifiers used in compressor (unit) performance test equipment... 21 B.1 Overview... 21 B.2 Structure... 21 B.3 Installation method... 22 Appendix C (Normative) Refrigeration (heating) capacity test method of compressor (unit)... 24 C.1 Overview... 24 C.2 Test methods D1 and D2.Refrigerant gas flow meter method... 26 C.3 Test method F. Refrigerant liquid flow meter method... 30 C.5 Test method J. Refrigerant gas cooling method... 34 C.6 Test method K. Calorimeter method for compressor exhaust pipe... 37 Appendix D (Informative) Symbols and definitions used in the formula... 40

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the China Machinery Industry Federation. This standard shall be under the jurisdiction of the National Technical Committee for Standardization of Refrigeration and Air-conditioning Equipment (SAC/TC 238). The responsible drafting organizations of this standard. Hefei General Machinery Research Institute, Zhuhai Gree Electric Appliances Co., Ltd., Trane Air Conditioning Systems (China) Co., Ltd., Shanghai Hanzhong Precision Machinery Co., Ltd., Hefei General Environmental Control Technology Co., Ltd., Hefei General Electromechanical Products Testing Institute Co., Ltd. The participating drafting organizations of this standard. Danfoss Automation Control Management (Shanghai) Co., Ltd., Zhejiang Dun'an Artificial Environment Co., Ltd. The main drafters of this standard. Zhang Xiuping, Zhang Zhiping, Zhang Weijia, Deng Zhuang, Wang Rujin, Liu Fulai, Liu Hongshao, Pan Zudong, Zan Shichao, Song Youqiang. This standard was published for the first time. 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

3 Terms and definitions

The terms and definitions as defined in JB/T 7249, as well as the following terms and definitions, apply to this document. 3.1 Centrifugal refrigerant compressor A compressor that relies on the impeller to do work on the refrigerant vapor to increase the pressure and velocity of the refrigerant vapor, then converts the kinetic energy into pressure energy in the diffuser, so that the refrigerant vapor flows radially through the impeller. 3.2 Centrifugal refrigerant compressor unit A unit assembled from a centrifugal refrigerant compressor, a prime mover and other accessories, used to compress refrigerant vapor. 3.3 Surging An instability phenomenon that occurs during the operation of a compressor (unit), characterized by large fluctuations in the refrigerant vapor flow rate over time, accompanied by strong vibrations and noise. 3.4 Choking An instability phenomenon that occurs during the operation of a compressor (unit), characterized by gas dynamic blockage, when the refrigerant vapor flow rate no longer increases with the action of the regulating mechanism.

4 Type and basic parameters

4.1 Type 4.1.1 According to the structure, it is divided into open type and semi-closed type. 4.1.2 According to the number of stages, it is divided into single stage, double stage, multi-stage. 4.3 Nominal operating conditions The nominal operating conditions of the compressor (unit) shall be as specified in Table 1.

5 Requirements

5.1 General requirements The compressor (unit) shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the 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 5.3.2 Air tightness When conducting air tightness test, the requirements are as follows. 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. 5.3.7 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 The compressor (unit) shall be subjected to partial load operation test; its refrigeration (heating) capacity and input power under partial load shall be measured; a partial load performance curve or performance table shall be drawn. 5.3.13 Winding temperature The measured motor winding temperature of the compressor (unit) shall not be higher than the winding temperature limit specified by the manufacturer.

6 Test

6.1 General requirements for the test 6.1.1 The compressor (unit) test device shall exclude non-condensable gases in the test system. Confirm that there is no refrigerant leakage. 6.1.2 The liquid pipeline and suction pipeline of the compressor (unit) test device shall be thermal-insulated. 6.1.8 The test cycle and data collection requirements, the allowable deviation of the test 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. 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. 6.2.7 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. 6.2.13 Winding temperature test After the compressor (unit) runs at the maximum value of the motor design power for 15 minutes, record the temperature data measured by the embedded temperature sensor in the motor winding; record it every 5 minutes, until the measured data is stable.

7 Inspection rules

7.1 Exit-factory inspection Each compressor (unit) shall be subject to the exit-factory inspection; the inspection items shall be in accordance with the provisions of Table 2.If the exit-factory inspection has been completed at the supplier, the corresponding inspection and test report can be provided instead. 7.2 Sampling inspection 7.3 Type inspection 7.3.1 If a new product or a finalized product undergoes major improvements, the first product shall undergo type inspection; the inspection items shall be in accordance with the provisions of Table 2. 7.3.2 If a compressor (unit) fails during test operation, it shall be re-inspected after the fault is eliminated.

8 Marking, packaging, transportation, storage

8.1 Marking 8.1.1 Each compressor (unit) shall have a permanent nameplate fixed in a conspicuous position; the nameplate shall comply with the provisions of GB/T 13306.The following information shall be marked on the nameplate. 8.1.2 The compressor (unit) shall be provided with signs indicating the operating status (such as the rotation direction of the compressor impeller, indicator instruments, control 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. 8.3 Transportation and storage 8.3.1 The compressor (unit) shall not collide, tilt, or be exposed to rain or snow during transportation and storage. 8.3.2 The packaged compressor (unit) shall be stored in a dry and well-ventilated warehouse. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

Tips & Frequently Asked Questions

Question 1: How long will the true-PDF of English version of JB/T 12843-2016 be delivered?

Answer: The full copy PDF of English version of JB/T 12843-2016 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.

Question 2: Can I share the purchased PDF of JB/T 12843-2016_English with my colleagues?

Answer: Yes. The purchased PDF of JB/T 12843-2016_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. www.ChineseStandard.us -- JB/T 12843-2016 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.

How to buy and download a true PDF of English version of JB/T 12843-2016?

A step-by-step guide to download PDF of JB/T 12843-2016_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "JB/T 12843-2016".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3    Steps 4~6    Step 7    Step 8    Step 9