DETAILED DECISION WORKFLOW
Put the principle into a project decision.
A process duty table is the foundation
Create one table with normal, minimum and maximum operating cases. For each case record feed flow with units, slurry density, dry-solids concentration, temperature, viscosity and relevant particle data. Identify which values are measured and which are preliminary. Explain the actual operating hours and whether feed arrives in batches or continuously. Attach the product targets with their analytical method and concentration basis. A supplier can then identify the limiting case rather than assuming that every maximum occurs at once or choosing a favourable nominal condition.
Separate mandatory requirements from preferences
Mark a requirement as mandatory only when the project has a defined reason for it. Examples can include a specific product-contact material, site electrical supply, equipment interface or documentation standard selected by the responsible team. Preferences such as a preferred control platform should be identified separately so alternative proposals remain visible. Allow the supplier to explain equivalent approaches where appropriate. This prevents an unnecessarily narrow specification from excluding a technically suitable route while still protecting requirements that are genuinely important to the process and installation.
Define what a complete package means
Draw a boundary around the supplier scope. List the feed pump, buffer vessel, chemical preparation, dosing, centrifuge, liquid discharge, cake handling, local controls and connections separately. For each item state whether it is supplied, existing, excluded or undecided. Identify responsibility for the civil foundation, lifting provisions, power distribution, ventilation and connection to the plant control system. If the package includes drying, define a separate inlet and outlet basis for the dryer. A single phrase such as “turnkey centrifuge system” cannot replace an interface matrix.
Ask for evidence at the right project stage
At enquiry stage, request the proposed separation principle, model family, major assumptions and required tests. After representative trials, ask for the operating envelope and supporting measurements. Before manufacture, agree the configuration, drawings and inspection plan. Before shipment, complete the agreed factory checks; after installation, complete the site and process acceptance activities defined for the project. These stages do not need identical evidence. For example, a no-load factory mechanical test cannot prove product recovery on a feed that was never introduced into the machine.
Make quotations comparable
Require a structured response against your duty and scope tables. Suppliers should identify deviations, optional items and unresolved questions explicitly. Keep guaranteed performance separate from catalogue data and preliminary estimates. State the basis for any quoted energy or chemical consumption. Compare service and spare-parts scope on the same intended operating schedule. Give each bidder the same answers to material technical clarifications so the final comparison is fair. Preserve a controlled revision of the RFQ rather than relying on a chain of inconsistent email attachments.
A concise first enquiry is still useful
If you do not yet have a full specification, send a short process description, the material, approximate feed range and required product result. Identify the missing data instead of inventing values. A competent first discussion should turn those gaps into a sampling plan and a list of measurements. Use the process brief on this site to organize the known inputs, then expand it as evidence becomes available. The aim is a clear engineering conversation; it is not necessary to fill every field before asking a useful question.
