A model page is an index record. It is useful when the fields mean the same thing from one factory to the next. It is harmful when a scraped brochure number is presented as a witnessed test. The methodology below is the rule set we use to keep those two states apart.
- Units
- Flow in m³/h, head in m, power in kW unless a record states otherwise.
- Dates
- Source-checked-at is the last time the cited material was reviewed.
- Conflicts
- When catalogs disagree, the field is flagged rather than averaged.
Record lifecycle
A record starts when a source can be named: a manufacturer page, a dated catalog PDF, a dimensional standard, or a factory application with supporting files. Fields are copied into a consistent schema. Ranges are stored as minima and maxima, not as a single “typical” number that hides impeller trims.
Publication requires a family, a slug, and a caveat the buyer can act on. A published record without a source URL stays labelled accordingly. Material changes — a renamed legal entity, a withdrawn series, a contradicted material list — send the record back through review.
- Source identified and archived.
- Fields normalized to consistent units and family names.
- Conflicts and missing values flagged for editorial review.
- Source check date published with the record.
- Material changes trigger re-review or unpublish.
What we do not invent
We do not interpolate a missing NPSHr. We do not convert a model code into a drop-in replacement for another OEM. We do not upgrade an evidence label because the factory bought placement. We do not delete a caveat because it makes the page look unfinished.
Where a Chinese series name is widely used in export quotes — ISW, ISG, IH, CDL, WQ, CQB — we keep the series visible and warn that geometry and hydraulics still vary by plant and impeller diameter.
Buyer verification still sits on the order
Use the index to shortlist. Use the RFQ to force a complete duty description. Then require the offered manufacturer curve with the duty point marked, a line-item material and seal schedule, named test standard and tolerance, and voltage / frequency / enclosure / efficiency class for the motor.
Questions buyers actually ask
Where do the numbers come from?
From named manufacturer or catalog sources when available, then normalized into KanBeng fields. Draft records exist when a series is commonly quoted but a dated source has not been attached.
Why can two factories show the same model code with different envelopes?
Chinese series names are often shared across plants. Impeller trims, materials and test grades differ. That is why comparison is a shortlist tool, not interchangeability.
How often are records updated?
When a source is re-checked, when a factory submits a correction, or when a conflict is reported. The source-checked date on the record is the public signal.
Can I send a catalog for indexing?
Yes. Use the Contact page and include the URL, document date and the pages that support the claimed duty range.