Which risk increases when early steam engine boilers, operating near material limits, experience scale buildup?

💡 Explanation

When scale builds up, localized overheating occurs because the scale acts as an insulator, reducing heat transfer from the metal to the water, causing the metal to overheat and weaken, leading to creep rupture. Therefore, creep rupture results, rather than efficiency loss, corrosion, or water hammer, which require different mechanisms.

• Which risk increases when Roman siege ramp foundations experience differential soil settlement?
• Which structural effect necessitates specific orientation relative prevailing wind direction during ziggurat construction?
• Which advancement did Al-Khwarizmi's work on 'Hisab al-jabr w'al-muqabala' enable for land surveying in Baghdad's irrigation systems?
• Which effect accompanied the introduction of the Bessemer process during the 19th century?
• Which navigational error increases when using a deteriorated medieval astrolabe without accounting for precession?
• Which navigation error occurs when chronometer's spring weakens in 18th century maritime navigation?