ISO 18847:2016 pdf free

ISO 18847:2016 pdf free.Solid biofuels一Determination of particle density of pellets and briquettes
The rig consists of a bridge, which overstretches the weighing plate of the balance in order to prevent the balance from being loaded. The bridge is capable of carrying the glass beaker (6.2.2). Through a supporting frame with suspension rods, a weighing dish (“submergence dish”) is hung into the glass beaker (Figure 1), which is filled with liquid (5.1). The dish shall be able to accommodate at least four pellets at once. Both the supporting frame and the submergence dish are directly loaded on the balance plate. The submergence apparatus (the dish and the suspension) can be removed when loaded with pellets. Through the dish suspension, the submergence depth is always kept constant. The bottom of the submergence dish is perforated by openings, which are smaller in diameter than the diameter of the pellets. This perforation allows the liquid to fill the dish from underneath when it is submerged. If test portion material of low density is tested (below 1,0 g/cm3), a modified suspension having an inverted submergence dish is required; this is to force the pellets underneath the liquid surface and prevent them from floating on top of the liquid. For the determination of the mass in air, it is useful to use a combined test rig where an additional upper weighing dish is fixed to the suspension (Figure 1).
While the briquette is submerged in the liquid, read the total mass from the balance and record it to the nearest 0,01 g. If briquettes with a total mass each of more than 500 g are tested, record to the nearest 0,1 g. If a sample of a lower density than 1,0 g/cm3 is tested, an extra weight shall be fixed to the load to prevent it from floating on top of the liquid. In this case, the taring of the balance to zero (8.2.6) has to include the same extra weight. The load shall not be in contact with either the walls or the bottom of the container. The reading of the mass in liquid shall take place as soon as possible after submersion of the briquette in order to prevent it from taking up any liquid or from decay. The reading is usually conducted within three seconds to five seconds after submerging, when the displayed value on the balance is constant.ISO 18847 pdf free.