ISO 556-2020 pdf free.Coke (greater than 20 mm in size)—Determination of mechanical strength.
1.This document specifies a method for the determination of the mechanical strength of coke having aparticle size greater than 20 mm.
2.Normative references:The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document(including any amendments) applies.
ISO 728,Coke (nominal top size greater than 20 mm) —Size analysis by sieving
ISO 18283,Hard coal and coke —Manual sampling
ISO 13909-6,Hard coal and coke —Mechanical sampling —Part 6:Coke —Preparation of test samples
3.Terms and definitions:No terms and definitions are listed in this document.
4.Principle:A sample of coke greater than 20 mm in size (Micum and lrsid tests) and of known size distribution issubjected to mechanical stresses in a rotating drum. If desired, a sample of coke may also be analysedwith a bottom size greater than 20 mm (e.g.40 mm or 60 mm).Should the starting bottom size of cokeused be different from 20 mm, it shall be stated in the test report.
The degree of breakdown of the coke is evaluated by a process of sieving and size analysis after 100drum revolutions(Micum test) and, if desired, after a total of 500 drum revolutions (Irsid test). Micumand Irsid tests may be performed on the same coke sample.
Table 1 lists sample and test conditions as well as results in conducting Micum, Irsid and half Micum /half Irsid tests.
5.The drum shall have an opening on the cylindrical surface through which the coke is charged anddischarged.The opening shall be fitted with a cover, the inner portion of which shall be of 10 mm steelplate of the same curvature as the drum, and which shall be of the same size as the opening so thatwhen the cover is secured, the inside face is substantially level with the internal surface of the drum.Arubber gasket should be fitted around the cover to minimize loss of dust.
Inside the drum, parallel to its axis and dividing the wall into four equal areas, four angle sections(or lifting flights) shall be fixed.Each lifting flight (for dimensions see Table 2), equal in length to thelength of the drum, shall be fixed rigidly to the full length of the internal curved surface of the drum.The position of the lifting flights is parallel to the axis of the drum in such a way that the flange ofwidth 100 mm points towards the axis of the drum, and the narrower flange, in contact with the curvedsurface of the drum, points in the direction opposite to that of rotation of the drum.
Drum wall thickness and lifting flight thickness should be measured after every 500 tests to ensureconformity to specifications. The drum shall be replaced if the wall thickness fals below 5 mm due towear. The angle sections (or lifting flights) shall be replaced when they wear to 95 mm.ISO 556 pdf download.