GVA Krefeld bundled the customers and transport requirements by GVA KnowHow to construct the individual customer Slagpot.
To slow down the kinetic energy of the pouring stream (slag and metal), the liquid level needs to rise quickly, so that the pouring stream can hit the so-called “swamp”. For this technique the slagpot bottom needs to be designed as a calotte. To reach the required slagpot volume the wall adjacent to the calotte has a bevel of 15°. Seen from the above, the slagpot can be oval or circular. An oval shape can be beneficiary for the emptying of the already cooled down slag scull if the slagpot is be tilted over the greater diameter axis.
Greater diameters are in general more favorable than smaller ones, as this simply reduces the risk of the slag stream hitting the slagpot-wall and also causes a bigger gap between the pot wall and the slag as it solidifies. This larger gap slows down the heat insertion into the slagpot wall and it also allows for easier emptying. Preferred slagpots are constructed with ratio of diameter to height of about 1:1.
If slagpots are to be transported by rail, they are typically designed to hang in a ring corset. However, most of the slagpots need to stand safely in an upright position in a work configuration. To allow both, GVA slagpots are equipped with “elephant feet”, which keep the body off the ground and assure the air cooling of the slagpot bottom. This choice of “feet” is also an advantage for the production of the casting, because slagpots are commonly casted upside down and the feeder head can therefore be easily applied at the feet.
The transport and handling with crane or a special road carrier system requires trunnions, which have to be above the center of gravity. The connection of the trunnion to the slagpot body with the optimized slagpot is designed so that the load of the weight is distributed into a large segment of the slagpot wall. The shrinking and expanding of the body should not be constrained, which averts premature deformation of the slagpot body. Similar connection designs exist for other essential elements like reaction pads, locking pockets or shackle eyes.
If a high level of “erosion” can be expected due significant portions of metal in the slag caused by the production process, the slagpot wall will be designed with different thickness.