An auxiliary plant on board a mobile offshore drilling unit that is invariably automated is the compressed air plant. Suppose the air compressors of such a plant are configured for lead-lag operation as shown in the illustration. If the sequence selector station is configured for #1 compressor to be the lead compressor and the #2 compressor to be the lag compressor, what statement is true? Illustration GS-0188

Question

Accepted Answer

#1 compressor would be the "duty" compressor, cycling off and on when the system demand for compressed air is light, and #2 compressor would be the "standby" compressor, cycling off and on only when the system demand for compressed air is heavy. As a consequence, #1 compressor will accumulate more running hours than #2 compressor.

Answer

#2 compressor would be the "duty" compressor, cycling off and on when the system demand for compressed air is light, and #1 compressor would be the "standby" compressor, cycling off and on only when the system demand for compressed air is heavy. As a consequence, #1 compressor will accumulate more running hours than #2 compressor.

Answer

#2 compressor would be the "duty" compressor, cycling off and on when the system demand for compressed air is light, and #1 compressor would be the "standby" compressor, cycling off and on only when the system demand for compressed air is heavy. As a consequence, #2 compressor will accumulate more running hours than #1 compressor.

Answer

#1 compressor would be the "duty" compressor, cycling off and on when the system demand for compressed air is light, and #2 compressor would be the "standby" compressor, cycling off and on only when the system demand for compressed air is heavy. As a consequence, #2 compressor will accumulate more running hours than #1 compressor.