Your ship-docking tug is fitted with an electric auxiliary steam boiler. What statement best represents the criteria for heating element removal, inspection, and servicing where the boiler is fitted with six elements consisting of upper and lower delta connected groups?

Question

Accepted Answer

The lower element group should be removed for inspection first. Only if cleaning is required to remove scale, should the upper element group be removed for inspection. If cleaning is not required, the lower element group can be replaced without any further inspection.

Answer

The upper element group should be removed for inspection first. Only if the elements are more than 50% deteriorated, should the lower element group be removed for inspection. If deterioration is less than 50%, the upper element group can be replaced without any further inspection.

Answer

The lower element group should be removed for inspection first. Only if the elements are more than 50% deteriorated, should the upper element group be removed for inspection. If deterioration is less than 50%, the lower element group can be replaced without any further inspection.

Answer

The upper element group should be removed for inspection first. Only if cleaning is required to remove scale, should the lower element group be removed for inspection. If cleaning is not required, the upper element group can be replaced without any further inspection.