Wet-grinding quotation / Media-charge basis
The same percentage can describe different physical charges when suppliers use different chamber references, exclude different internals, apply different settling procedures or convert volume to mass with a different bulk-density value. Preserve the percentage, then trace its denominator, media identity, calculation and measured loading record.
Stop the percentage comparison
This page audits the volume-to-mass basis of a grinding-media charge. It does not select bead size or material, publish a universal fill setting, calculate product residence time, set specific energy, predict throughput or prescribe an operating procedure.
Ask the candidate supplier to define the reference volume and revision, including whether shaft, rotor, discs, pegs, separator and other internals are included or excluded. A chamber label or nominal volume does not by itself identify the denominator used for media fill.
Attach media manufacturer, type, lot, nominal size, size-fraction record, new or used condition, bulk-density value, source and measurement method. Do not substitute true or specific density for the settled or poured bulk-density basis used in the charge calculation.
Record calculated target mass separately from scale-measured loaded mass, then reconcile removed, spilled and top-up quantities. Preserve the loading and verification reference state, approvals, wear rule and every trigger that requires revalidation.
Quote-to-quote audit
The table compares definitions and records. It supplies no universal fill percentage, chamber volume, bulk density, charge mass, wear limit or JINPIONEER operating value.
Swipe or scroll horizontally to review every evidence column.
| Audit row | Proposal A | Proposal B | Approval evidence |
|---|---|---|---|
| Reference-volume denominator | Copy the supplier's definition of 100% fill, reference-volume value, drawing or calculation revision and included or excluded internals. | Record the second definition independently; do not assume a nominal chamber label or working volume uses the same denominator. | Controlled drawing or supplier statement, reference state, volume basis, exclusions, revision, owner and unresolved difference. |
| Media identity and condition | Record manufacturer, product or type, lot, nominal size, size-fraction width and whether media is new, conditioned or used. | Keep the second media record separate; identical material names or nominal sizes do not prove identical packing or bulk-density behavior. | Supplier data, lot trace, incoming or recovered-media condition record and approved substitution rule. |
| Bulk-density basis | State value, unit, source, sample condition, container, filling, settling or leveling method and measurement date. | Use its own method record; do not replace bulk density with true or specific material density or an unrelated catalogue value. | Method, raw mass and volume observations, repeatability record, approver and controlled value used for calculation. |
| Target volume and mass | Preserve the supplier-approved fill envelope and show the selected fraction, reference volume, resulting bulk volume and calculated target mass as separate fields. | Rebuild the same chain using the second proposal's definitions; do not transfer a percentage or mass between mill revisions. | Calculation revision, units, inputs, rounding, author, checker, selected target and stated assumptions. |
| Measured loading and balance | Record scale ID, calibration status and resolution, loaded mass, removed mass, spill, recovery and top-up by event. | Apply the same mass-balance categories to the second proposal and keep calculated target separate from actual scale readings. | Time-stamped weighing record, operator, witnessed exceptions, unexplained difference and approved final charge state. |
| Verification and change control | State how the charge is verified, at which reference state, how wear or loss is inspected and what triggers replacement, top-up or revalidation. | Record its procedure independently; a matching percentage does not prove matching verification, wear history or operating condition. | Trial release, responsible approvers, inspection interval, acceptance rule, deviation path and revalidation triggers. |
Audit route
Preserve the supplier's original language first. Then define the reference volume, attach the actual media and bulk-density method, calculate a target mass, measure the charge and close the mass balance before trial release.
Freeze the candidate mill and grinding-system revision, then obtain the OEM definition of the 100% reference volume and approved fill envelope.
Identify the exact media, lot, size distribution and condition, and retain the source and method for the bulk-density value used.
Keep the calculated target mass separate from calibrated-scale observations and reconcile loading, removal, spill, recovery and top-up events.
Approve the verification reference state, wear and replacement rule, exceptions, responsible reviewers and every change that forces revalidation.
Media-fill-basis RFQ checklist
Unknown values remain open supplier questions. These fields do not prescribe a media fill, prove mill compatibility or authorize loading or operation.
Open the process briefManufacturer or candidate supplier, model or equipment ID, quotation, drawing and document revision; unknown items stay open.
Shaft, rotor, disc or peg system, chamber, separator and every internal affecting the declared reference volume, with revision control.
Exact supplier definition, reference state, named volume and source document; do not infer it from a chamber label.
Candidate-supplier approved range or selection basis, governing conditions, exclusions and engineering owner; no value is assumed here.
Value, unit, calculation or drawing basis, included and excluded shaft, rotor, discs, pegs, separator and other internal volume, plus revision.
Traceable manufacturer, product or composition designation, lot or batch, supplier record and approved substitution status.
Nominal size, stated size range or distribution, measurement source and lot-specific incoming or recovered-media record.
New, conditioned, recovered or used state; cleaning, contamination, wear history, moisture or retained product condition where relevant.
Value and unit, sample state, container volume, filling, settling or leveling method, repetitions, date, author and source; keep true density separate.
Reference volume, selected supplier-approved fraction, required bulk volume, bulk-density input, result, units, rounding, revision, author and checker.
Scale or load-cell identity, range, resolution, current calibration or verification status and any tare or container record.
Supplier-approved work reference, sequence owner and observed reference state; this page provides no operating instruction.
Time-stamped quantities, scale source, operator, recovery, transfer loss, unexplained difference and approved final measured state.
How the candidate supplier requires charge verification, equipment state, acceptance rule, evidence record and responsible witness.
Inspection evidence, loss or wear evaluation, contamination limit, disposition, replacement or top-up decision and owner; no universal threshold is supplied.
Supplier engineering, process, safety and production approvals, deviations, release state and changes to mill, internals, media, method or calculation that reopen review.
Draft source record / Pending technical review
These first-party sources were reviewed on 31 July 2026 for terminology, measurement and traceability structure. Their named machines, test methods, grinding media, values and recommendations remain specific to the source organizations and are not transferred.
Buyer decision FAQ
It must be defined by the candidate mill supplier. The reference may depend on a controlled chamber or grinding-system volume and on which internals and reference state are included. Preserve the exact OEM definition and revision instead of inferring it from a nominal chamber label.
No. True or specific density describes the material itself, while bulk density includes the voids created by how discrete media pack in a measured volume. Record the value, sample condition, container, filling, settling or leveling method and source used in the calculation.
Only after the reference-volume denominator, selected supplier-approved fraction, media identity and condition, and method-specific bulk-density value are controlled. The resulting target mass still has to remain separate from the actual calibrated-scale loading record.
No. Grinding media occupy part of the grinding system, while product hold-up and residence-time behavior depend on the product-accessible flow path and operating state. Keep those records separate and use the dedicated residence-time guide for the product-side question.
Not without supplier review. Different chamber and grinding-system revisions, internals, reference-volume definitions, media, packing condition and verification methods can produce different physical charges from the same percentage label.
No. It publishes an RFQ and evidence structure only. Any JINPIONEER mill definition, approved envelope, media compatibility, target charge, measured mass, procedure or performance remains unconfirmed until supported by supplier engineering and project-specific review.