ISO 4778:2019 pdf free.Round steel short link chains for lifting purposes一Chain slings of welded construction一Grade 8.
For the calculation of a working load limit (WLL) for angles other than specified, the indicated formulae shall be used in a corresponding manner. For this purpose, the value of the maximum angle of a range or the fixed inclination angle is inserted into the corresponding formula.Chain slings according to this document shall comply with the mechanical requirements given in Table 2,3 and 4 for the appropriate test sections.
If the whole chain sling is heat treated, it shall be tested as an assembly by subjecting each test section to a value for the manufacturing proof force (MPF) at least equal to the value specified in Tables 2,3 and 4., calculated on the bases given in Annex A. Subsequently, the chain sling shall be examined by a competent person. The manufacturer shall also verify that all components remain in accordance with the appropriate requirements of the component standards.
If only the inserted links are heat treated, they shall be considered as a test section, as well as any parts of the chain sling affected by this heat treatment. These sections shall then be subjected to a value for the manufacturing proof force (MPF) at least equal to the value specified in Tables 2,3 and 4, calculated on the bases given in Annex A. Subsequently, the inserted links and any parts of the chain slings affected by heat treatment shall be examined by a competent person. The manufacturer shall also verify that all components remain in accordance with the appropriate requirements of the component standards.
The manufacturer shall have records concerning the breaking test and bend test for every type and size of sling chain and link built into the complete chain sling.
The manufacturer shall have records concerning the breaking test for every type and size of each other component built into the complete chain sling.
The manufacturer shall have records concerning the fatigue test for every type and size of each
component built into the complete chain sling.
The records may be done during the manufacturing of separate lots of these parts as long as their
manufacturing processes are similar to them for the complete chain sling.
If records concerning the above-mentioned individual tests are not available, the tests shall be
conducted using the latest chain slings to be manufactured.
5 Marking 5.1 General The following information shall be shown on a metal tag or on a label permanently attached to the master link or to a link immediately adjacent to it. Alternatively, all or a part of the information may be marked on the master link provided the mechanical properties of the master link are not impaired. 5.2 Single leg chain sling a) number of chain legs, “1”; b) nominal diameter; c) grade, “8”; d) working load limit (kg or t); e) manufacturer’s name or symbol;
f) if appropriate, an individual identification mark (related to the manufacturer’s certificate).
5.3 Double leg chain sling a) number of chain legs, “2”; b) nominal diameter; c) grade, “8”;d) working load limit at inclination angle0° < β≤45° (kg or t); e) working load limit at inclination angle 45° < β≤60° (kg or t); f) manufacturer’s name or symbol; g) if appropriate, an individual identification mark (related to the manufacturer’s certificate). 5.4 Three and four leg chain sling
a number of chain legs, “3” or “4”; b) nominal diameter; c grade,”8″; d) working load limit at inclination angle0°<β≤45° (kg or t); e) working load limit at inclination angle 45° < β≤60° (kg or t);
f] manufacturer’s name or symbol; g) if appropriate, an individual identification mark (related to the manufacturer’s certificate).ISO 4778 pdf download.