Applications check: in which of the following listed installations are silica refractories generally NOT used as the standard lining material?

Introduction / Context:Silica bricks exhibit excellent refractoriness and creep resistance at high temperature and have traditionally been used where structural rigidity and load-bearing at elevated temperature are required. However, lining selection also depends on thermal cycling, slag chemistry, and the evolution of furnace designs.

Given Data / Assumptions:

• Coke oven walls and beehive coke ovens historically employ silica bricks for dimensional stability at high temperature.
• Hot-blast stove domes and upper checkers commonly use silica due to high-temperature strength.
• Open-hearth technology has seen diverse roof linings over time; modern practice and alternatives complicate the historical picture.

Concept / Approach:Although classic literature lists silica for some open-hearth roofs, many designs moved toward basic or high-alumina roofs to accommodate different thermal and chemical demands, especially where thermal cycling and slag/atmosphere interactions favor alternatives. In contrast, the other listed installations are canonical, textbook applications for silica refractories. Therefore, within the scope of the options, “open-hearth furnace roof” is presented as the exception.

Step-by-Step Solution:Identify canonical silica applications: coke ovens and hot-blast stove domes.Evaluate open-hearth roof practice: varied and often non-silica in later practice.Select the exception among the list provided.

Verification / Alternative check:Historical and regional practices differ; many plants adopted high-alumina or basic roofs for open-hearths, whereas silica remained entrenched in coke oven batteries and stove crowns. The question expects the exception relative to the other, strongly silica-associated installations.

Why Other Options Are Wrong:Coke oven walls / beehive ovens: classic silica applications.Hot-blast stove domes: silica is widely employed for high-temperature strength.Glass tank crown (added distractor): also a typical silica use.

Common Pitfalls:Assuming open-hearth practice is uniform across eras and regions.Overlooking the strong, near-universal association of silica with coke ovens and stove domes.

Final Answer:Open-hearth furnace roof