Separate the two selection questions
A decanter can address a defined settleable-solids load; a disc machine can address a finer clarification or separately specified phase duty. Confirm the exact selected machine, bowl/outlet arrangement and feed conditions. A generic separator name does not establish three-phase capability.
Measure every configured outlet
Use paired feed and outlet samples, record flow and solids/phase observations, and weigh every collected stream. Include intermittent discharge, hold-up and samples. Document whether an oil-rich cream stream has a real dedicated outlet or remains with the product.
Review the installed operating boundary
Assess discharge handling, cleaning access, product carryover and operating stability over the agreed run. A clear bottle sample does not alone specify solids removal, oil recovery or full-line output.