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JB/T 8872-2016 PDF in English


JB/T 8872-2016 (JB/T8872-2016, JBT 8872-2016, JBT8872-2016)
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
JB/T 8872-2016English125 Add to Cart 0-9 seconds. Auto-delivery. Specification for carbon-graphite sealing ring for mechanical seals  
JB/T 8872-2002English140 Add to Cart 0-9 seconds. Auto-delivery. Specification for carbon-graphite sealing ring for mechanical seals Obsolete
JB/T 8872-1999English359 Add to Cart 3 days (Mechanical seal carbon graphite seal ring technical conditions) Obsolete
Standards related to (historical): JB/T 8872-2016
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JB/T 8872-2016: PDF in English (JBT 8872-2016)

JB/T 8872-2016 MACHINERY INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.140 J 22 Record number: 53591-2016 Replacing JB/T 8872-2002 Specification for carbon-graphite sealing ring for mechanical seals ISSUED ON: JANUARY 15, 2016 IMPLEMENTED ON: JUNE 01, 2016 Issued by: Ministry of Industry and Information Technology of the PRC Table of Contents Foreword ... 4  1 Scope ... 5  2 Normative references ... 5  3 Product classification ... 6  4 Requirements ... 6  5 Inspection methods ... 8  6 Inspection provisions ... 9  6.1 Inspection classification ... 9  6.2 Exit-factory inspection ... 9  6.3 Appraisal inspection ... 9  7 Marking, packaging, transportation, and storage ... 10  Appendix A (Informative) Chemical corrosion resistance of carbon-graphite sealing ring materials ... 11  Appendix B (Informative) Friction coefficient and recommended pairing materials of carbon-graphite sealing ring ... 12  Appendix C (Informative) Thermal performance parameter values of carbon- graphite sealing ring (normal temperature ~ 200°C) ... 13  Table 1 -- Material classification of carbon-graphite sealing ring ... 6  Table 2 -- Physical and mechanical properties of various carbon-graphite sealing ring materials ... 7  Table 3 -- Planeness error of seal face ... 7  Table A.1 -- Chemical corrosion resistance of carbon-graphite sealing ring materials ... 11  Table B.1 -- Friction coefficient and recommended pairing materials of carbon-graphite sealing ring ... 12  Table C.1 -- Thermal performance parameter values of carbon-graphite sealing ring ... 13  Foreword This Standard is drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces JB/T 8872-2002 “Specification for carbon-graphite sealing ring for mechanical seals”. As compared with JB/T 8872-2002, the main technical changes of this Standard are as follows: - Adjust the physical and mechanical property parameters of some carbon- graphite sealing ring materials; - Modify the hydraulic test method for the graphite ring; - Modify the inspection provisions. This Standard was proposed by China Machinery Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee 491 on Mechanical Seal of Standardization Administration of China (SAC/TC 491). Drafting organizations of this Standard: Wuxi Zhongqiang Electrical Carbon Co., Ltd., Hefei General Machinery Research Institute, Fujian Minxuan Technology Co., Ltd., Zhejiang Tianying Mechanical Seals Co., Ltd., Ningbo Vulcan Mechanical Seal Manufacturing Co., Ltd. Main drafters of this Standard: Wu Qiang, Tu Xianghua, Wu Guoping, Zhu Bin, Zhao Jiaqian, Li Kun. The previous editions of the standard replaced by this Standard were released as follows: - ZB J22 2017-1989; - JB/T 8872-2002. Specification for carbon-graphite sealing ring for mechanical seals 1 Scope This Standard specifies the product classification, requirements, inspection methods, inspection provisions, marking, packaging, transportation, and storage, etc. of carbon-graphite sealing ring for mechanical seals. This Standard applies to the material selection and design of carbon-graphite sealing ring for mechanical seals. 2 Normative references The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document. GB/T 1184-1996 Geometrical tolerancing - Geometrical tolerance for features without individual tolerance indications GB/T 1958 Geometrical Product Specifications (GPS) - Geometrical tolerance - Verification GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 3177 Geometrical product specifications (GPS) - Inspection of plain workpiece sizes JB/T 2934 Carbon material and carbon products for mechanical engineering JB/T 8133.4 Test Method for Physical-chemical Properties of Electrical Carbon Product - Part 4: Shore Hardness JB/T 8133.7 Test Method for Physical-chemical Properties of Electrical Carbon Product - Part 7: Transverse Strength JB/T 8133.8 Test Method for Physical-chemical Properties of Electrical Carbon Product - Part 8: Compressive Strength 4.5 The parallelism of the seal face of planar sealing ring to the end face which the auxiliary sealing ring contacts, in accordance with GB/T 1184-1996, has Grade 7 tolerance. 4.6 The surface roughness of the contact surface between the planar sealing ring and the auxiliary sealing ring is not more than Ra 3.2 μm. 4.7 The size tolerances of the static ring and rotating ring of planar sealing ring and of the outer circle and inner hole in contact with the auxiliary sealing ring are h8 or H8. 4.8 The perpendicularity of the seal face of static ring and rotating ring of planar sealing ring to the outer circle and inner hole in contact with the auxiliary sealing ring, in accordance with GB/T 1184-1996, has Grade 7 tolerance. 4.9 The carbon-graphite sealing ring shall be tested for hydraulic pressure (internal pressure). Sealing rings for non-balanced and balanced mechanical seals shall have a test pressure of 0.8 MPa and 1.6 MPa respectively for 10 min and shall not leak. If there are special requirements, it shall be carried out according to the drawings. 4.10 The carbon-graphite sealing ring is not allowed to have cracks, oxidation, delamination, penetrating pitting, pores, impervious impregnation. 4.11 The chemical corrosion resistance, friction coefficient, recommended pairing materials and thermal performance parameters of carbon-graphite sealing rings are given in informative Appendix A, B, and C, respectively. 5 Inspection methods 5.1 The test methods of Shore hardness, transverse strength, compressive strength, volume density, and open porosity of carbon-graphite sealing ring material shall be in accordance with JB/T 8133.4, JB/T 8133.7, JB/T 8133.8, JB/T 8133.14, and JB/T 8133.15. 5.2 The hydraulic inspection of carbon-graphite sealing ring material is carried out on a dedicated hydraulic test device. 5.3 The size deviation and geometrical tolerance of carbon-graphite sealing ring are respectively inspected according to the provisions of GB/T 3177 and GB/T 1958. 5.4 USE an intuitive method to inspect the surface defects of carbon-graphite sealing ring. 6 Inspection provisions 6.1 Inspection classification The inspection is classified into exit-factory inspection and appraisal inspection. 6.2 Exit-factory inspection 6.2.1 Inspection items The inspection items are carried out according to 4.2~4.10. 6.2.2 Sampling method The appearance quality is 100% inspected. The sampling schemes for the size deviation, geometrical tolerance, and hydraulic test of carbon-graphite sealing ring are all in accordance with the provisions of GB/T 2828.1. USE single normal sampling scheme. The special inspection level is S-4. The acceptance quality level AQL=4.0. 6.3 Appraisal inspection 6.3.1 Inspection timing In one of the following cases, it shall carry out an appraisal inspection: a) Before design is finalized and product is put into production; b) There are major changes in product structure, materials, and processes; c) Transfer plant production of products; d) Required by the user; e) Required by the national quality supervision department. 6.3.2 Inspection items In addition to the inspection according to 6.2, according to the specified requirements or when required by the client, the Shore hardness, transverse strength, compressive strength, density, and open porosity of the material shall also be tested. 6.3.3 Sampling method At least 1 sample is taken for each lot of products for inspection. ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.