BS 8407 pdf free download

BS 8407-2002 pdf free download.Specification for mechanical and spliced joints in conveyor belting for use underground.
This British Standard specifies requirements for joints made in conveyor belting for use underground.
It specifies performance requirements for the following properties:
— joints made with mechanical fasteners (static strength);
— joints made with mechanical fasteners (dynamic strength);
— joints made by chemical splicing/vulcanization (static strength);
— joints made by chemical splicing/vulcanization (dynamic strength).
The methods of test to be used to validate the requirements are specified in the annexes. This standard is not applicable or valid for light conveyor belts as specified in BS EN 873.
NOTE Although this standard is intended to specify the requirements for conveyor belting, the test methods specified in 4.1.1 and 4.2.1 can also be used to assess the performance of mechanical fasteners when used with specific types of conveyor belting. For this reason, an alternative test configuration is specified in Annex A.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
BS EN ISO 1120, Conveyor belts — Determination of strength of mechanical fastenings — Static test method.
BS 3289, Specification for textile carcass conveyor belting for use in underground mines (including fire performance).
BS 1610, Methods for the load verification of testing machines.
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply:
3.1 fastener pitch
the nominal distance between a point on a fastener unit and the corresponding point on the next fastener
unit (see Figure A.1 and Figure A.2)
3.2 fastened width
the number of fastener units inserted in one end of a test piece multiplied by the pitch (see Figure A.1
and Figure A.2)
3.3 nominal tensile strength
the specified minimum value of the tensile strength of the conveyor belt, expressed in N/mm
3.4 joints the joining of individual lengths of conveyor belting to produce a longer length
NOTE This should not be confused with transverse (or longitudinal) fabric joints made during the production process for multi-ply belting.
4 Mechanical fastener holding (applicable only to textile belting)
4.1 Static tensile strength
4.1.1 Test method
Belts up to and including Type 15 (2 650 N/mm) shall be tested in accordance with BS EN ISO 1120.
4.1.2 Requirement
For new belting, the mean value obtained shall be not less than 60 % of the nominal tensile strength for
belts of tensile strength up to and including 1 400 N/mm (Type 8), and not less than 50 % of nominal tensile
strength for belts above 1 400 N/mm.
4.2 Dynamic life-test
4.2.1 Test method
Belts up to and including Type 15 (2 650 N/mm), as defined in BS 3289:1990, shall be tested in accordance
with Annex A.
4.2.2 Requirements
When tested in accordance with 4.2.1, belts of nominal tensile strength up to and including 2 650 N/mm
(Type 15 as defined in BS 3289:1990) shall conform to Table 1.
NOTE 1 The type of fastener specified in Table 1 is for test purposes only, and to allow a comparison of belt performance. The table
is not a list of approved or recommended fasteners.
NOTE 2 Solid mild steel pins should be used, of appropriate diameter, as recommended by the fastener supplier.
In line with good practice, belts of Type 12 and above would normally be vulcanized. Mechanical fasteners,if used, shall conform to the static tensile strength requirement specified in 4.1.2.
5 Spliced/vulcanized joints (applicable to textile and steel cord conveyor belts)
5.1 Static tensile strength
5.1.1 Test method
Belts up to and including those of tensile strength 3 150 N/mm shall be tested in accordance with Annex B.
5.1.2 Requirements
When tested in accordance with 4.1.1, the loop shall not break at less than 60 % of the belt’s nominal tensile strength for textile belting, and 70 % for steel cord belting. This shall apply to all belts up to and including 3 150 N/mm.
5.2 Dynamic life-test
5.2.1 Test method
Belts up to and including those of tensile strength 3 150 N/mm shall be tested in accordance with Annex C.
5.2.2 Requirements
When tested in accordance with 5.2.1, textile belts up to and including Type 18 shall conform to Table 2.
In addition to completing the required minimum number of cycles, the tested loop shall have a remaining tensile strength of not less than 50 % of nominal tensile strength.
Steel cord belts shall complete 1 000 000 cycles and have a residual tensile strength of not less than 60 % of the nominal tensile strength of the belt.BS 8407 pdf download.