JB/T 8872-2016 PDF English
US$125.00 · In stock · Download in 9 secondsJB/T 8872-2016: Specification for carbon-graphite sealing ring for mechanical seals Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureJB/T 8872: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| JB/T 8872-2016 | English | 125 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Specification for carbon-graphite sealing ring for mechanical seals
| |
| JB/T 8872-2002 | English | 140 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Specification for carbon-graphite sealing ring for mechanical seals
| Obsolete |
| JB/T 8872-1999 | English | 359 |
Add to Cart
|
3 days
|
(Mechanical seal carbon graphite seal ring technical conditions)
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: JB/T 8872-2016
JB/T 8872-2016: Specification for carbon-graphite sealing ring for mechanical seals---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/JBT8872-2016
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 full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of JB/T 8872-2016 be delivered?Answer: The full copy PDF of English version of JB/T 8872-2016 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 8872-2016_English with my colleagues?Answer: Yes. The purchased PDF of JB/T 8872-2016_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+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- JB/T 8872-2016 -- 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. Question 5: Should I purchase the latest version JB/T 8872-2016?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JB/T 8872-2016 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of JB/T 8872-2016?A step-by-step guide to download PDF of JB/T 8872-2016_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 8872-2016".
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
|