Exam Question
(a) State why double walled fuel pipes are employed for high pressure fuel lines. (6)
(b) Sketch and describe such a double walled pipe arrangement and show how high pressure pipe failure is indicated. (10)
Class 4 (4th Engineer)
MEKM
📅 Sep 2024
Reference Answer
### (a) Reasons for Double-Walled Fuel Pipes for High-Pressure Fuel Lines
Double-walled fuel pipes are mandated for high-pressure fuel lines on marine engines primarily for safety and environmental protection, addressing the severe hazards associated with a potential single-wall pipe failure.
* **Fire and Explosion Risk Mitigation:**
* **High-Pressure Atomisation:** High-pressure fuel lines (e.g., fuel injection pipes, common rail systems) operate at pressures ranging from hundreds to over 2000 bar. A leak or fracture in a single-walled pipe at these pressures would result in the fuel being atomized into a fine, highly combustible mist or spray.
Double-walled fuel pipes are mandated for high-pressure fuel lines on marine engines primarily for safety and environmental protection, addressing the severe hazards associated with a potential single-wall pipe failure.
* **Fire and Explosion Risk Mitigation:**
* **High-Pressure Atomisation:** High-pressure fuel lines (e.g., fuel injection pipes, common rail systems) operate at pressures ranging from hundreds to over 2000 bar. A leak or fracture in a single-walled pipe at these pressures would result in the fuel being atomized into a fine, highly combustible mist or spray.
Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.
Prepare on Android — MeoMock on Google Play