🔍 Key Concepts

• Crankcase explosion relief valves purpose and function on diesel engines • Typical safe overpressure range in crankcases before structural damage risk • Relevant guidance from SOLAS II-1 and engine manufacturer standards on low-pressure venting

💭 Think About

• Think about whether crankcases are designed to withstand high or low internal pressures in an explosion situation. • Consider what would happen to crankcase covers and engine structure if the relief set pressure were close to 1 bar or higher. • Compare the options and eliminate any pressures that seem clearly too high for a thin, large-surface engine crankcase door to safely contain.

✅ Before You Answer

• Verify that crankcase relief valves are designed to open at a very low overpressure to vent flames and gases safely. • Check which options are well below 1 bar, as crankcases are not pressure vessels. • Confirm that the chosen value matches typical exam references for diesel engine crankcase relief valve setting in marine engineering texts.