Mixing tank / Volume-definition acceptance
A quoted tank volume can refer to a commercial name, calculated vessel geometry, a liquid level at a named boundary or a usable batch condition after internals and freeboard are considered. Those meanings are not interchangeable, and no universal fill percentage resolves them.
Reconcile four boundaries
This route owns only the reconciliation from quoted volume fields to the controlled drawing, calculation and acceptance record. The complete process brief remains with the Mixing Tank RFQ Checklist; mixing results, thermal duty, pressure design, throughput, hygiene, classification and safety remain separate reviews.
Require the supplier to define total, nominal, nameplate, brimful, gross and working terms instead of treating them as synonyms. Record the unit, reference datum, liquid boundary, vessel orientation and controlled document revision beside every value.
Freeze shell and head geometry, nozzles, overflow or vent boundary, agitator, shaft, baffles, coil and every other installed item that can change available liquid volume. Keep the drawing revision and displacement register attached.
State the batch stage, additions, foam or gas allowance, stopped or agitated state, required freeboard, level limits, overflow path and excluded heel or hold-up. These project boundaries cannot be replaced by a generic fill percentage.
Link the approved calculation to batch mass and density records and, where contracted, to an approved FAT fill or weigh record with identified test medium, temperature, instrument or scale, reference level, raw observations, deviations and release authority.
Volume-definition map
The rows allocate definitions and evidence; they do not prescribe a fill fraction, capacity or operating level. Project documents and named approvers must define the actual boundary.
Swipe or scroll horizontally to review every evidence column.
| Quoted or calculated field | Possible physical meaning | What it does not establish | Controlled reconciliation record |
|---|---|---|---|
| Geometric total volume | Calculated internal vessel geometry for the explicitly named shell, heads and upper boundary in the stated orientation. | Nominal sales size, liquid volume at an operating level, net volume after internals or usable batch capacity. | Approved general-arrangement drawing, dimensional inputs, head and shell calculation, datum, units, revision and checker. |
| Nominal / nameplate / catalogue volume | A commercial or identification label whose governing definition must be stated by the quotation owner. | A unique geometric, brimful, overflow, gross-liquid or working-volume boundary. | Quotation definition, datasheet or nameplate field, linked drawing and calculation, exclusions and commercial approver. |
| Brimful / rim-full volume | Liquid volume to the precisely defined physical top boundary for an open geometry, if that term is applicable and controlled. | A safe operating level, required freeboard, closed-vessel capacity, overflow level or usable working batch. | Marked physical boundary, orientation, closure state, drawing revision, calculation and explicit operating exclusion. |
| Volume to overflow, vent or named nozzle boundary | Calculated or measured liquid volume to one identified elevation and hydraulic boundary. | The high operating level, alarm or trip setting, foam margin, freeboard or volume available under every process state. | Nozzle schedule, elevation datum, hydraulic path, level matrix, calculation and approved boundary owner. |
| Gross liquid volume at a defined level | Geometric liquid volume below one marked level before explicitly listed internal displacements or retained spaces are deducted. | Net batch inventory, product mass, drainable quantity, mixer effectiveness or allowable operating range. | Level-to-volume table or calculation with vessel geometry, datum, units, interpolation and revision control. |
| Internals displacement | The immersed volume of the exact installed agitator, shaft, baffles, coil, supports, probes and other listed items at a defined level. | A universal deduction or a value that remains valid after an internal, nozzle, level or drawing change. | Itemized displacement register, component drawings or models, immersion boundary, calculation method and change record. |
| Net working / usable batch volume | A project-defined liquid or batch inventory for a named operating state after declared geometry, internals and freeboard boundaries are applied. | Mixing time, homogeneity, suspension, heat-transfer performance, pressure rating, throughput or product suitability. | Controlled reconciliation sheet linking quote, drawing, displacement, batch, level and acceptance evidence with exclusions. |
| Minimum working quantity | A separately reviewed lower batch condition for the intended configuration and process stage. | Acceptable impeller coverage, circulation, thermal behavior, measurement reliability or process result without separate evidence. | Process requirement, level and configuration record, candidate-supplier review and separate representative evidence where required. |
| Freeboard / headspace allowance | The difference between the declared operating liquid boundary and a separately defined upper physical or control boundary for the named state. | One universal percentage, foam control, venting adequacy, pressure or vacuum suitability, spill prevention or safety release. | Batch-stage matrix, additions and foam basis, level boundaries, overflow or vent path, owner, exclusions and change trigger. |
Controlled project evidence
These project records are the primary evidence. No generic ASTM or ISO capacity rule is used to turn an undefined quotation label into an accepted working volume.
Swipe or scroll horizontally to review every evidence column.
| Evidence item | Controlled source | Boundary to preserve | Result or discrepancy record | Owner and release |
|---|---|---|---|---|
| Approved general-arrangement drawing and nozzle schedule | Controlled vessel GA, sections, dimensions, nozzle and overflow schedule, orientation, datum and revision. | Exact shell, heads, upper boundary, openings, supports and as-built differences included in the volume basis. | Revision match, marked elevations, unresolved dimensions, redlines and approved as-built update. | Named supplier drawing owner, buyer mechanical reviewer and document-control release. |
| Controlled volume calculation and level-to-volume record | Calculation inputs, geometry sections, equations or software revision, units, rounding and independent check. | Volume definition, reference datum, orientation, calculation limits and any interpolation kept explicit. | Raw calculation, check result, differences from quote fields and approved disposition. | Named preparer, checker, responsible technical reviewer and quotation owner. |
| Internals-displacement register | Itemized agitator, shaft, baffle, coil, support, probe and other immersed-component drawings or models. | Component identity, quantity, installed elevation, immersed portion, configuration revision and exclusions. | Calculated displacement by item, omitted or changed items and revised net-volume reconciliation. | Supplier mechanical owner, buyer reviewer and change-control authority. |
| Batch mass, volume, density and temperature record | Approved batch or formulation inventory, weighing records and density method at the declared material condition. | Mass-to-volume conversion, additions, temperature, entrained gas or foam, uncertainty and process stage separated. | Reconciled batch inventory, observed differences and limitations without treating density as a fixed universal value. | Buyer process, production, laboratory or quality owner and supplier reviewer where assigned. |
| Operating-level, freeboard and upper-boundary matrix | Approved minimum, normal and maximum batch-stage record plus level, overflow, vent, nozzle, alarm and trip boundaries. | Stopped or agitated state, additions, foam or gas allowance, freeboard purpose, heel or hold-up and excluded conditions. | Declared working boundary, open assumptions, conflict with drawings or quote and approved correction. | Buyer process and safety owners, controls owner and candidate-supplier technical approver. |
| Level instrument and physical-reference record | Instrument identity, sensing principle, mounting, calibration or verification, physical dip or sight reference and signal mapping. | Measurement datum, medium, temperature, vessel state, dead zones, alarm mapping and declared uncertainty. | Raw readings, physical cross-check, offsets, deviations and approved level-to-volume relationship. | Instrumentation owner, test performer, buyer witness and disposition authority. |
| FAT fill or weigh record | Contract-approved protocol, test medium, temperature, fill increments, calibrated scale or volume basis, witness and raw record. | As-tested vessel and internals, named reference level, temporary connections, substitutions and applicability to service. | Measured or derived observations, calculation comparison, deviations, retest and bounded acceptance statement. | Contract-defined supplier performer, buyer witness, deviation owner and factory-release authority. |
Reconciliation route
This is a document and evidence sequence, not a filling instruction or operating procedure. Site and supplier safety controls govern any inspection or test activity.
List every volume field exactly as quoted and require a written definition, reference datum, level boundary, vessel state, unit and governing document.
Approve the vessel drawing and itemized internals register before accepting a calculated gross or net liquid volume.
Map batch stages, additions, foam or gas, stopped or agitated state, freeboard, level controls, overflow or nozzle elevations and excluded heel or hold-up.
Compare intended batch mass and volume using the approved density and temperature record, keeping raw observations, uncertainty and unresolved differences visible.
Where required, execute only the approved fill or weigh protocol on the identified configuration and retain the test medium, instruments, reference level, raw results and deviations.
Approve one reconciliation sheet that states what each volume means, which conditions it covers, what it excludes and which changes reopen review.
Mixing-tank volume RFQ checklist
Unknown values remain open and assigned. Do not copy a competitor's fill fraction, infer a working volume from a model name or treat a substitute-medium test as product-process proof.
Open the process briefEvery total, geometric, nominal, nameplate, brimful, gross, net, working, usable, minimum and maximum term exactly as quoted, with its declared meaning and unit.
General-arrangement and section drawings, orientation, internal dimensions, heads, upper boundary, datum, revision and approval status.
Named physical boundaries, centreline or invert definition, hydraulic path, datum, drawing reference and owner.
Geometry sections, equations or controlled software, units, rounding, interpolation, preparer, checker and linked drawing revision.
Declared level points, orientation, gross or net basis, interpolation, physical reference and revision control.
Agitator, shaft, baffles, coil, supports, probes and other immersed items by identity, quantity, elevation, drawing and displacement method.
Configuration at each stage, redlines, changed components, changed elevations and the owner of the final reconciliation.
Required quantities by batch stage and whether each record is mass, gross liquid volume, net batch volume or another controlled basis.
Source of mass and density data, measurement or calculation method, material and temperature state, uncertainty and conversion owner.
Batch stage, addition quantity and rate basis, foam or entrained-gas observation, required headspace purpose and responsible process owner.
Vessel and material state attached to each operating level without inferring mixer performance or a safe operating instruction.
Instrument identity, sensing basis, calibrated or verified range, physical reference, alarms, trips, dead zones, bypass control and responsible owner.
Bottom geometry, outlet and dip-pipe boundaries, retained spaces, declared exclusions and separate recovery or drainability evidence.
Gross level volume, itemized deductions, freeboard boundary, batch cross-check, units, rounding, discrepancy and approved result field.
Whether a capacity check is contracted, exact as-tested vessel and internals, test medium and temperature, temporary items, exclusions and applicability limits.
Approved safe protocol, fill increments or weighing basis, instrument or scale identity, calibration status, uncertainty and raw-data format.
Required witnesses, notification, hold and release points, marked reference level, raw readings, photographs if approved and record custodian.
Difference from quote, drawing, calculation or test; numbered disposition, corrective evidence, retest trigger and revised controlled record.
Mixing time or effectiveness, heat transfer, pressure rating, throughput, hygienic design, reactor classification and safety suitability retained as separate, unproven decisions.
Buyer and supplier document, process, mechanical, instrumentation, quality and safety owners; bounded decision; open items; and changes that reopen review.
Buyer decision FAQ
Total volume must be defined against a named geometric boundary. Working volume is a project-defined batch condition after the relevant level, installed internals, freeboard and operating exclusions are applied. Neither term has a safe universal meaning without those records.
Not automatically. Nominal or nameplate volume can be a commercial identifier, while brimful refers to a precisely defined physical upper boundary when applicable. Require each quotation owner to state the definition and link it to the controlled drawing and calculation.
No. Vessel geometry, internals, batch stages, additions, foam or gas behavior, level boundaries, overflow or nozzle elevations and the purpose of freeboard differ. The project must define and approve its own operating boundary.
It can support only the approved as-tested geometry and reference level within the stated medium, temperature, instrument, uncertainty and configuration boundary. Product batch mass, density, foam, additions and operating state require their own reconciliation.
No. It also does not prove hygienic design, reactor classification or safety suitability. Those are separate engineering and acceptance decisions requiring their own project-specific evidence and responsible approval.
No. It is an RFQ and evidence-reconciliation framework only. Tank geometry, total or working volume, internals, freeboard, instruments, test scope, capacity, performance, suitability, service and results remain unconfirmed until project-specific supplier and buyer evidence is reviewed and approved.