BS ISO 556:2020 pdf download – Coke (greater than 20 mm in size) — Determination of mechanical strength.
5.2 Tray, >1 000 mm × >900 mm × 200 mm deep, constructed from a suitable abrasion-resistant and wear-resistant material for receiving the coke on discharge. One end wall of the tray shall be inclined outwards at 45° to facilitate emptying. NOTE 1 Trays of approximately 1 500 mm × 1 100 mm × 200 mm deep were found to be suitable. NOTE 2 1,22 mm galvanized sheet has been found suitable for the tray. 5.3 Weighing machine, preferably of the platform type, of maximum capacity 100 kg (50 kg for half Micum or half Irsid test) and such that the weighing error does not exceed 0,1 kg (0,05 kg for half Micum or half Irsid test). 5.4 Round-hole test sieves, comprising a series of perforated plates with circular apertures (ISO 3310-2) that will enable a complete size analysis of the coke under examination to be determined. Test sieves with apertures of diameter 10 mm, 20 mm and 40 mm shall be included. Others in the series may be, for example, 31,5 mm, 60 mm, 80 mm and 100 mm. It is important to check the sieves from time to time (e.g. after 500 sievings) using the methods described in ISO 3310-2, to ensure that the hole dimensions are within the specified tolerances. Worn or damaged sieves could give rise to serious errors in size analysis and shall be discarded. 5.5 Series of light containers, the largest of which shall be capable of holding 50 kg of coke (i.e. capacity of at least 0,12 m 3 ) for the handling and collection of all different sieve fractions. 6 Sample preparation A gross sample shall be taken consisting of approximately 100 kg of coke according to ISO 18283 or ISO 13909-6. The lower size limit shall be not less than 20 mm, but where the lower nominal size of the coke sample is greater than 20 mm, this lower nominal size may be used for the preparation of a Micum test portion (see 8.2). This sample shall be subjected to a size analysis according to ISO 728. In Table 3 a set of suitable sieves is given. Sieves of 10 mm, 20 mm, and 40 mm are mandatory for bottom sizes >40 mm, >20 mm and sievings after test.