Lancashire boiler — classification check State whether the Lancashire boiler is correctly described as a stationary, fire-tube boiler.

Introduction / Context:
Boiler taxonomy—by tube arrangement, orientation, and installation—helps identify operating limits and typical duties. The Lancashire boiler is a historical mainstay of stationary steam generation in industry. This question checks accurate classification.

Given Data / Assumptions:

• Large cylindrical shell, two internal furnace tubes running longitudinally.
• Fixed (non-mobile) brickwork setting.
• Hot gases inside tubes, water around tubes (fire-tube construction).

Concept / Approach:
In fire-tube boilers, combustion gases flow through tubes surrounded by water. Lancashire boilers are horizontally mounted, internally fired via the twin furnace tubes, and are permanently installed on site. Hence, they are stationary fire-tube boilers.

Step-by-Step Solution:

Verification / Alternative check:
Standard references list Lancashire alongside Cornish as classic stationary, internally fired, horizontal, fire-tube types.

Why Other Options Are Wrong:

• Disagree: contradicts well-established classification.
• Vertical/mobile caveats: Lancashire is horizontal and fixed, not locomotive or marine by default.

Common Pitfalls:
Confusing Lancashire (two furnaces) with Cornish (single furnace) and with water-tube designs used for very high pressures.

Final Answer: