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Brick and Refractory BasicsBrick Materials--In an EAF, the term ''brick'' can apply to a silica brick, a high alumina firebrick, or a basic brick:* Silica brick is an acid resistant brick usually made from ganister, bonded with a small amount of time. Silica brick has high resistance to thermal shock.* High alumina bricks are standard firebricks made with a high percentage of alumina ranging from 50 to 90 percent. A high alumina brick has high resistance to spalling due to rapid temperature changes.

Mark/B-LOC: The most challenging applications are those in which components are subjected to continuous shock, vibration, or reversing loads, in these cases, keyless locking devices generate sufficient preload to ensure backlash-free connection.Jeff/KTR: Applications that include large reversing loads provide the greatest challenges.Vic/Rimtec: If the goal is accurate positioning, high-duty cycle, reversing loads are the most difficult, especially if they require high acceleration and deceleration.Jeff/Tollok: The most challenging applications almost always involve extremely high torques or heavy shock loads. Operational environment and other external influences can also be challenging.PitfallsWhat are the most common pitfalls and how can they be prevented?Jeff/Tollok: Selecting the wrong type of locking assembly is a big issue. Erroneous sizing calculations and improper installation and mounting are other pitfalls. My advice is to carefully review your application parameters with your locking assembly supplier.

Rating the riskIn Dane County, Wisconsin, the double-walled tanks are the containment system of choice, according to Bob Williams, marketing manager for the DanCo ES Co-op. "With this system, you don''t get a buildup of water in the containment dike," he says. While he has installed five of the fuel tank systems in the past year, Williams admits many producers are hesitant to make the investment. "We try to get them to go with some type of containment because long-term we think they will need it. We provide financing to ease the cost," he says.