ISO 556:2020 pdf download

ISO 556:2020 pdf download.Coke (greater than 20 mm in size) — Determination of mechanical strength
1 Scope
This document specifies a method for the determination of the mechanical strength of coke having a particle 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 content constitutes requirements 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.
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.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Principle
A sample of coke greater than 20 mm in size (Micum and Irsid tests) and of known size distribution is subjected to mechanical stresses in a rotating drum. If desired, a sample of coke may also be analysed with a bottom size greater than 20 mm (e.g. 40 mm or 60 mm). Should the starting bottom size of coke used 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 100 drum revolutions (Micum test) and, if desired, after a total of 500 drum revolutions (Irsid test). Micum and 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 Apparatus
5.1 Cylindrical steel drum, having the following dimensions (see Table 2 and Figure 1):The drum shall have an opening on the cylindrical surface through which the coke is charged and discharged. The opening shall be fitted with a cover, the inner portion of which shall be of 10 mm steel plate of the same curvature as the drum, and which shall be of the same size as the opening so that when the cover is secured, the inside face is substantially level with the internal surface of the drum. A rubber 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 the length 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 of width 100 mm points towards the axis of the drum, and the narrower flange, in contact with the curved surface of the drum, points in the direction opposite to that of rotation of the drum.