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JB/T 8872-2002 English PDF (JBT8872-2002)

JB/T 8872-2002 English PDF (JBT8872-2002)

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JB/T 8872-2002: Specification for carbon-graphite sealing ring for mechanical seals

This Standard specifies the product classification, requirements, test methods, inspection rules, marking, packaging, transportation, and storage, etc. of carbon-graphite sealing ring for mechanical seals. This Standard applies to carbon-graphite sealing ring for mechanical seals.
JB/T 8872-2002
MACHINERY INDUSTRY STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 21.140
J 22
Replacing JB/T 8872-1999
Specification for carbon-graphite sealing ring for
mechanical seals
ISSUED ON: JULY 16, 2002
IMPLEMENTED ON: DECEMBER 01, 2002
Issued by: State Economic and Trade Commission of the PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Product classification ... 5
4 Requirements ... 5
5 Test methods ... 7
6 Inspection rules ... 7
7 Marking, packaging, transportation, and storage ... 8
Appendix A (Informative) Chemical corrosion resistance of carbon-graphite sealing ring materials ... 9
Appendix B (Informative) Friction coefficient and recommended pairing
materials of carbon-graphite sealing ring ... 10
Appendix C (Informative) Thermal performance parameter values of carbon- graphite sealing ring (normal temperature ~ 200??C) ... 11
Table 1 -- Material classification of carbon-graphite sealing ring ... 5 Table 2 -- Physical and mechanical properties of various carbon-graphite sealing ring materials ... 6
Specification for carbon-graphite sealing ring for
mechanical seals
1 Scope
This Standard specifies the product classification, requirements, test methods, inspection rules, marking, packaging, transportation, and storage, etc. of carbon-graphite sealing ring for mechanical seals.
This Standard applies to carbon-graphite sealing ring for mechanical seals. 2 Normative references
The following documents contain the provisions which, through reference in this Standard, become the provisions of this Standard. For the dated references, their subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest editions of these documents are applicable. For undated reference documents, the latest
editions apply to this Standard.
GB/T 1184-1996 Geometrical tolerancing - Geometrical tolerance for
features without individual tolerance indications (eqv ISO 2768-2:1989) GB/T 1800.3-1998 Limits and fits - Bases - Part 3: Numerical values tables of STANDARD tolerances and fundamental deviations (eqv ISO 286-1:1988)
GB 1958-1980 Rules for inspection of form and position tolerances
GB/T 2828-1987 Sampling procedures and tables for lot-by-lot inspection by attributes (Apply to inspection of successive lots or batches)
GB/T 3177-1997 Inspection of plain workpiece sizes
JB/T 2934-1993 Mechanical carbon materials and products
JB/T 4127.1-1999 Specification for mechanical seals
JB/T 8133.1~17-1999 Test method for physical-chemical properties of
electrical carbon product
JB/T 9580-1999 Classification and type arrangement method of carbon-
4.8 The perpendicularity of the seal face of static ring and rotating ring of carbon-graphite 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. Sealing rings for non-balanced and balanced mechanical seals shall have a test pressure of 1MPa and 2.4MPa for 10min 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, 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 Test 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.
5.2 The hydraulic inspection of carbon-graphite sealing ring material is carried out on a dedicated hydraulic test device.
5.3 The size tolerances and form and position tolerances of carbon-graphite sealing ring are respectively carried out according to the provisions of GB/T 3177-1997 and GB 1958-1980.
5.4 USE an intuitive method to inspect the surface defects of carbon-graphite sealing ring.
6 Inspection rules
6.1 The carbon-graphite sealing ring, before leaving the factory, shall be inspected by the quality inspection department. The inspection items shall be carried out in accordance with 4.2~4.10.
6.2 The sampling scheme of Shore hardness, transverse strength, compressive strength, density, and open porosity of carbon-graphite sealing ring material is in accordance with GB/T 2828. USE double normal sampling scheme. The
special inspection level is S-3. The acceptance quality level AQL=6.5.
6.3 The sampling scheme of size tolerances, form and position tolerances, hydraulic test of carbon-graphite sealing ring material is in accordance with GB/T 2828. USE single normal sampling scheme. The special inspection level is S-3. The acceptance quality level AQL=6.5.
6.4 Surface defects of carbon-graphite sealing ring shall be 100% inspected. 7 Marking, packaging, transportation, and storage
7.1 The non-working surface of carbon-graphite sealing ring shall be indicated with marks such as the manufacturer?€?s trademark or code, type.
7.2 The packaging of carbon-graphite sealing ring shall ensure that it will not be damaged during transportation and storage.
7.3 The products, when leaving the factory, shall be packaged in a sturdy packaging box. The words such as ?€?Handle with care?€? and ?€?Keep dry?€? shall be marked on the outside of the box. A packing list shall be attached to the box with the following:
a) Manufacturer?€?s name and trademark;
b) Product name and type specifications;
c) Lot number;
d) Quantity and weight;
e) Standard number;
f) Exit-factory date.
7.4 The product, when leaving the factory, shall be accompanied by a product qualification certificate.
7.5 The product shall be stored in a clean and dry warehouse.

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