A closed loop package is the whole chain, engineered as one thing: shakers, dryers, centrifuges, pumps, tanks and cuttings handling, sized to the well plan and the disposal route rather than assembled from whatever was in the yard.
Pit free operation is often a permit requirement now, but the reason to run it properly goes beyond compliance. A system designed around the fluid and the disposal plan keeps mud weight and rheology where the program wants them, reduces dilution volume, and drops what leaves location.
Tell us the mud system, the hole sizes, the anticipated circulating rates and the disposal plan, and we will lay out the combination that actually gets you there. If part of your existing spread already does the job, we will say so.