Maintenance & Reliability
The slag pot, which transports slag produced during the steelmaking process, does not lay refractories on the inner surface in order to separate slag more easily. Therefore, since the temperature greatly differs between the part in contact with slag and other parts, the lifetime of the slag pot is limited by deformation and crack due to thermal stress. By optimizing stiffness structurally for temperature distribution, a slag pot was developed that can reduce thermal stress by 28%. More than two years of continuous evaluation confirmed that there was hardly any deformation.
Roll neck bearings are subject to high loads, high temperatures, as well as water ingress and other contaminates. Due to these challenging operating conditions, standard industrial greases typically will not provide suitable performance in these applications. Special lubricant properties are required to improve bearing performance under these conditions. This paper will cover the proper selection of lubricant properties, lubrication replenishment interval, as well as application features that aid in water and contaminate exclusion, such that roll neck bearing performance can be optimized.
Torch-cutting equipment is a bottleneck in the continuous casting line and therefore requires high reliability, which can be aided by predictive maintenance systems. framag developed a new, sophisticated, retrofittable condition monitoring system based on a sensoric platform that was in evaluation at selected customer production sites. This paper lays out how the system detects process deviations, failures and the remaining lifetime of torch-cutting components. It shows the possible options for data distribution (programmable logic controllers, mobile devices, etc.) in the rather conservative steel plant environment. This new system improves the existing torch-cutting process in the steel manufacturing industry.
For a wide variety of applications where indirect heat is required, as opposed to direct firing, radiant tubes can provide a dependable answer. “W” and “U”-style radiant tubes dominate the current installed base of radiant tubes. But like any industrial heating technique, radiant tube applications require proper selection, calibration and tuning to maximize production rates, minimize maintenance, and optimize energy use and consumption. Realizing the operational ideal for radiant tube applications requires knowing the fundamentals, the ability to recognize common issues, and taking advantage of different methods and available technologies. This paper will explore techniques for making the most of radiant tube heating applications.
Cleaning water-based tanks and basins historically has required a great deal of inconvenience and cost. Tanks had to be drained and entered, completely shutting down any processes relating to their use. On-line robotics, however, eliminates all of that. Robots drive along the bottom of the tank, utilizing microdredging methods to pull material and water out of the tank. The mixture is separated and the water returned. This method keeps tanks functional, saves water, produces safer waste and keeps employees out of confined spaces. Therefore, on-line robotics should be the preferred method of all facilities for water-based tank/basin cleaning.