KanBeng model records list material options as tags: cast iron, 304, 316L, PTFE, duplex. Those tags are a filter. They are not a corrosion analysis. A factory that can pour all five will still default to the cheapest unless the RFQ names parts.

Ask for a schedule, not a slogan

Require casing, impeller, wear rings, shaft, shaft sleeve, seal faces and elastomers as separate lines. “SS pump” often means a stainless impeller in a cast-iron body, or 304 where the drawing said 316L. For lined pumps, name the lining thickness, spark-test requirement and what happens at the impeller eye.

Chlorides punish 304

304 is a common catalog upgrade that still pits in warm chloride service. 316L is better, not immortal. Duplex grades and high-alloy irons exist because 316L has limits. If you do not know the chloride level, say you do not know; do not pick 304 because it is on the model page.

Acids, alkalis and solvents are not one family

Fluoroplastic-lined and magnetic-drive constructions exist for a reason. They introduce other failure modes: permeation, liner collapse, dry-run of a containment shell, torque limits. A metallic chemical pump and a lined pump are different machines even when the series letters look similar on a quote.

Seals fail first

Face materials and elastomers often die before the casing. Name the seal plan, faces and O-rings. If the factory answers with “mechanical seal, good quality”, they have not bid the seal.

Use the index, then leave it

Filter KanBeng records by material tag to drop obviously wrong families. Then put chemistry, temperature and the part-by-part schedule in the RFQ. If you need a corrosion allowance or a lined construction, say that in words; the tag list cannot infer it.

Match the chemical to a construction and a named selection

Start with the liquid specification: chemical name, concentration, normal and upset temperatures, density, viscosity, solids or crystals, and any entrained gas. Include tank levels and interruptions to the suction supply. These details decide whether a lined centrifugal pump, magnetic drive or slurry construction is worth discussing.

The Wofulong liquid-and-installation comparison sets out CQB for clean-liquid magnetic drive, IHF for a conventional centrifugal arrangement, FZB for suction lift and UHB-ZK for slurry service. They are alternatives for different service conditions, not four interchangeable answers to “corrosive”.

For a concrete catalogue row, the CQB50-32-160F record lists 12.5 m³/h at 32 m head with a 4 kW motor at 2,900 r/min, for the table's reference density of 1,000 kg/m³. This identifies one catalogue selection; a different density, viscosity or temperature needs a fresh hydraulic and motor assessment. The source excludes dry running and liquids with particles or crystals. A fluid-compatible lining does not remove those operating limits.

Make the material enquiry answerable

  • Wetted construction: request the exact lining or metal, containment shell, bearing, seal-face and elastomer materials against the stated chemistry and temperature.
  • Operating protection: describe loss of suction, gas, tank-emptying and restart conditions; identify what dry-run or temperature protection is included.
  • Acceptance: agree the marked duty curve, parts schedule, inspection documents and configuration-specific tests. Optional monitoring is not included merely because it appears in a family brochure.

Choose “Chemical / magnetic drive” as the equipment family, enter CQB50-32-160F in Model Reference, and put the chemical and construction questions in Requirements. Prepare a Wofulong chemical-pump RFQ. The desk reviews the request before any supplier introduction.