The offshore supply vessel to which you are assigned has main engines fitted with intake and exhaust systems as shown in the illustration. What statement is true concerning the turbocharger charge air discharge arrangements? Illustration MO-0177
• Use the illustration legend to distinguish exhaust gas, inlet air, and compressed air flow paths. • Identify which components are the compressor outlets (charge air discharge) of each turbocharger and which pipes are the intake manifolds for each cylinder bank. • Notice whether the compressed air lines from each turbocharger connect only to one bank, cross over to the opposite bank, or join a common manifold feeding both banks.
• Starting at the compressor wheel of the right-side turbocharger, follow only the compressed air (not the exhaust) using the shading pattern. Which cylinder bank(s) does that piping clearly connect to? • Repeat the process for the left-side turbocharger. Does its compressed air discharge go to the same place as the right turbo, the opposite bank, or its own separate bank? • Look at the number of discharge connections from each turbocharger to the intake manifolds. Do you see one outlet per turbo going to a single bank, two outlets per turbo going to both banks, or lines crossing over to the opposite bank?
• Verify you are tracing the correct medium by checking the legend for the texture representing compressed air. • Confirm whether there is a common compressed-air manifold that both turbos feed, or clearly separate manifolds for each bank. • Before choosing, re-check that you are not confusing the exhaust gas manifolds (from the cylinders to the turbine) with the charge air manifolds (from the compressor to the cylinders).
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