Stainless tank / Surface-finish acceptance
A finish name can identify a mill or fabrication appearance, while Ra is one profile parameter measured under stated conditions. Neither one, by itself, defines weld dressing, pits, scratches, directionality, passive condition, residues, cleanability or the complete product-contact surface that will be delivered.
Separate the evidence
The RFQ must state which surfaces are in scope and which evidence owns appearance, roughness, fabrication defects, treatment and cleaning release. Do not translate a grit number, No. 4 label or nominal sheet finish into an invented Ra result.
Map product-contact shell, heads, nozzles, agitator, internals, removable parts, welds and heat-affected zones. Distinguish incoming flat product, formed surfaces, shop-fabricated areas, field welds and repaired areas.
Record finish designation, abrasive or polishing sequence and direction separately from the requested roughness parameter and acceptance value. A process label cannot substitute for an as-built measurement record.
Name the parameter and standard edition, instrument and stylus, filter and cutoff settings, evaluation length, direction, location, repeats, calibration or verification and treatment state. One isolated average does not describe every surface feature.
Combine the approved drawing and finish schedule with material traceability, fabrication and weld records, treatment record, location-based measurements, visual inspection, cleaning evidence where required, deviations and change control.
Finish evidence map
These rows allocate evidence rather than prescribe a finish or acceptance value. The responsible buyer and technical parties must define the actual service, hygiene, corrosion, cleaning and regulatory requirements.
Swipe or scroll horizontally to review every evidence column.
| Quoted field | What it may describe | What it does not establish | Controlled acceptance record |
|---|---|---|---|
| Mill / sheet finish designation | The supplied flat-product finish or a referenced product-form convention. | The final formed, welded, ground, polished and treated tank surface. | Material standard, product form, original finish, fabrication changes and final finish schedule. |
| Grit or abrasive number | One abrasive or process description within a controlled polishing route. | A unique Ra value, complete topography, defect-free surface or hygienic release. | Abrasive system, sequence, direction, tool condition, area, operator or procedure revision and final inspection. |
| No. 4 or sanitary-finish wording | A commercial appearance or project-specific finish convention when its governing document is named. | A universal roughness value, a certification or the absence of pits, folds, crevices and fabrication defects. | Exact governing specification, surface locations, exclusions, measured fields and defect criteria. |
| Ra result | One arithmetic profile-height parameter from a defined trace and evaluation setup. | Equivalent topography, lay, peak shape, isolated defects, corrosion resistance or cleanability. | Standard edition, parameter, instrument settings, trace direction, location map, repeats and raw results. |
| Weld and heat-affected zone | A fabricated region whose geometry, discoloration, dressing and treatment can differ from parent material. | Acceptance from a parent-sheet finish certificate or a remote base-metal reading. | Weld map, procedure and dressing scope, visual criteria, local measurement plan, treatment and repair evidence. |
| Pickling / passivation / electropolishing | Different chemical or electrochemical treatment routes with project-specific purposes and controls. | Interchangeability, an automatic Ra result, corrosion immunity, cleanability validation or certification. | Named procedure, chemistry and controls, precondition, coverage, rinse and residue controls, verification and exclusions. |
| Visual inspection | Defined appearance and visible-defect checks under agreed viewing conditions. | A substitute for profile measurement, material verification, residue testing or cleaning validation. | Lighting, distance, angle, reference panel or photographs, areas, defect definitions and disposition owner. |
| Cleanability or hygienic requirement | A system-level requirement involving geometry, joints, drainage, materials, surface condition, cleaning method and evidence. | A conclusion from Ra, grit, polish or stainless grade alone. | Applicable project or hygienic-design standard, complete boundary, cleaning method, test or inspection plan and approval evidence. |
Acceptance route
The sequence does not select a universal finish, Ra threshold, abrasive, treatment or cleaning method. Those choices depend on the actual product, corrosion, contamination, cleaning, hygiene and destination requirements.
Identify every in-scope product-contact and non-product-contact area, component, joint, weld, formed surface, removable part and field-fabricated interface.
State governing specification, finish and treatment route, measured parameter, numerical acceptance owner, defect criteria, visual condition and cleaning evidence without converting one into another.
Freeze instrument and settings, orientation, sampling locations and density, weld coverage, repeats, calibration or verification, raw-data retention and nonconformance handling before fabrication release.
Review the as-built finish schedule, treatment and inspection records, deviations, repairs and any project-specific cleaning or hygienic evidence before bounded acceptance.
Stainless-tank surface-finish RFQ checklist
Unknown values remain open and assigned. Do not infer JINPIONEER materials, fabrication, polishing, passivation, electropolishing, metrology, hygienic design, certification or achieved results from this framework or its sources.
Open the process briefProduct identity and state, concentration, solids, abrasiveness, corrosion concerns, contamination sensitivity and process owner.
Cleaning agents, temperature, time, flow, manual or automated route, sterilization if applicable, inspection and release method.
Buyer, destination, industry or project standard, exact edition, contractual precedence and responsible interpretation owner.
Shell, heads, nozzles, agitator, internals, baffles, fasteners, removable parts, welds, heat-affected zones and external areas.
Material grade and product form evidence, sheet or plate finish designation, heat or lot traceability and starting condition.
Formed surfaces, shop welds, site welds, grinding, blending, repairs, attachments and responsibility split.
Exact term such as a project finish code or product finish and the document that defines what it means for each location.
If prescribed, abrasive system, sequence, tool, direction, coverage, procedure revision and prohibited substitutions.
Named parameter rather than ‘roughness’ alone, units, required limit or range supplied by the responsible buyer and disposition owner.
Applicable profile standard and edition, responsible metrology party, qualification and controlled procedure.
Instrument identity, stylus or sensor, filter, cutoff or nesting index, evaluation length, range, speed and software or calculation revision.
Trace direction relative to lay, exact points or zones, parent material and weld coverage, repeats and inaccessible-area disposition.
Reference standard, calibration or verification status, pre/post checks, individual traces, raw values, summary and record retention.
Weld class and map, profile and dressing requirement, discoloration and heat-tint criteria, crevices, penetrations, attachments and local checks.
Pits, folds, laps, scratches, gouges, embedded contamination, directional appearance, lighting and approved reference panels or photographs.
Pickling, passivation, electropolishing or other treatment procedure, precondition, chemistry and control, coverage, rinse, residue and verification.
Separate geometry, slope, drainability, joints, dead-leg or crevice review, cleaning coverage and project-specific acceptance evidence.
Which records can be closed at the factory, which require installed-site evidence and whether water or another medium can support the intended conclusion.
Permitted repair route, affected-area re-treatment and remeasurement, nonconformance disposition, concession authority and traceability.
Required fabrication, treatment, measurement and inspection records, open gaps, buyer and supplier reviewers, bounded release and revalidation triggers.
Draft source record / Pending technical review
These sources support vocabulary and evidence boundaries only. They do not select a project finish, transfer a certification or establish any supplier capability or delivered result.
Buyer decision FAQ
No universal conversion follows. Abrasive system, sequence, pressure, tool condition, material, starting surface, direction, operator or automation, forming, welds and treatment can change the result. Specify the process only where needed and verify the agreed parameter on the as-built surface.
No. A finish designation needs its governing product or project specification. Do not treat the label as a universal numerical result or transfer a flat-sheet finish directly to a fabricated vessel and welds.
No. Ra is one profile parameter and does not by itself describe every peak, valley, pit, scratch, crevice, joint, weld, lay, residue, drainage condition or cleaning route. Cleanability requires its own complete design and evidence review.
No. Forming, welding, heat tint, dressing, repairs and treatment can change the local condition. Map weld and heat-affected zones and state their own fabrication, visual, measurement, treatment and repair evidence.
No. They are different treatment routes with different controlled purposes and conditions. Name the required procedure, surface precondition, scope, verification and exclusions instead of substituting one label for another.
No. It is an RFQ and evidence-allocation framework only. Materials, fabrication, finishes, welds, treatments, measurements, values, cleanability, hygienic design, services, compliance, certification and results remain unconfirmed until project-specific evidence is reviewed and approved.