ANSWER FIRST
A corrosive-liquid pump is selected from the real duty, not a material name.
Chemical compatibility is conditional. The same chemical can require a different material or configuration when concentration, temperature, solids, vapour behaviour or installation conditions change. The hydraulic duty matters as well: a pump must meet the normal operating point after piping, elevation and process pressure are considered. Confirming the following details before quotation reduces the risk of selecting a pump that is unsuitable for the actual liquid or system.
Eight details to confirm before requesting a quote
1. Exact chemical name
Do not describe the liquid only as an acid, alkali, solvent, wastewater or “chemical liquid.” Provide the most exact name available. For a mixture, identify the main components and any cleaning or flushing liquids that will contact the pump. A pump supplier cannot make a reliable material review from a broad category alone.
2. Chemical concentration
Concentration can affect material compatibility. A material that may be considered for one concentration should not automatically be assumed suitable for every concentration of the same chemical. State the normal concentration and explain whether it can vary during startup, cleaning, batching or upset conditions.
3. Actual operating temperature
Material compatibility must be checked at the actual operating temperature, not only at ambient conditions. Temperature can also change viscosity, vapour behaviour, suction performance and the practical hydraulic duty. Include normal temperature as well as any expected minimum or maximum operating condition.
4. Required flow and total dynamic head
Provide normal required flow and total dynamic head, or the discharge pressure and the information needed to determine it. If the system has minimum, normal and maximum duties, state all three. Motor power or pipe diameter alone does not define the duty. Pump selection should be based on the actual operating point, not only the maximum value printed in a catalogue.
5. Specific gravity and viscosity
When a liquid is not water, specific gravity and viscosity can affect power requirement, hydraulic performance, suction condition and the pump principle that should be considered. A high-viscosity liquid should not be assessed as if it were clean water. Provide measured or process-design values where available, and note whether they change with temperature or concentration.
6. Solids, crystals or suspended particles
Confirm whether the liquid contains solids, suspended material, particles or a tendency to crystallize. Standard clean-liquid magnetic drive pumps should not automatically be selected for solids-containing or crystallizing service. These conditions can change the appropriate pump type and the review required for internal wetted components.
7. Suction conditions
State whether the pump has flooded suction or suction lift, and provide tank level, pipe diameter, pipe length, valves, filters and available inlet pressure. Correct flow and head do not compensate for poor inlet conditions. If the installation genuinely needs self-priming service, review the actual suction arrangement rather than choosing only from a product name.
8. Wetted materials and pump principle
Do not decide first that the answer must be stainless steel or fluoroplastic and then try to fit the process around that decision. Chemical, concentration, temperature, solids, viscosity, leakage risk and suction conditions together determine the pump principle, wetted materials and configuration that should be reviewed.
Information to provide in a chemical-pump RFQ
| Information | Why it matters | Example of what to provide |
|---|---|---|
| Chemical | Defines the starting point for compatibility review. | Exact liquid name and mixture components. |
| Concentration | Can change material suitability. | Normal value and expected range. |
| Temperature | Affects compatibility and liquid behaviour. | Normal, minimum and maximum operating temperature. |
| Flow and head | Define the hydraulic operating point. | Minimum, normal and maximum duty if applicable. |
| Specific gravity / viscosity | Affects power, hydraulic performance and inlet conditions. | Process-design values at operating temperature. |
| Solids | May change the pump principle and internal review. | Presence, size and crystallization tendency. |
| Suction condition | Determines whether the inlet route can supply the pump. | Tank level, lift, pipework, filters and valves. |
| Material requirement | Must match every wetted component, not a label alone. | Preferred material only if a process requirement exists. |
Which pump type should be considered?
The pump principle follows the process requirements. A magnetic drive pump can be considered for clean liquid applications where avoidance of a conventional rotating shaft seal is important and material compatibility has been confirmed. For corrosive clean liquids, a CQB-F fluoroplastic magnetic drive pump can be a candidate configuration, subject to review of the exact chemical, concentration, temperature and every wetted material.
An air operated diaphragm pump can be considered where liquid characteristics, pneumatic drive requirements or a different transfer principle call for it. Where an installation genuinely requires suction-lift service, a ZCQ self-priming magnetic drive pump may be relevant, but its practical suction condition must still be reviewed. These are selection directions, not universal recommendations.
Why “stainless steel” or “fluoroplastic” is not enough
A material name does not replace a chemical compatibility review. “Fluoroplastic” does not mean universal resistance, and “stainless steel” does not describe suitability for every corrosive duty. Confirm the exact chemical, concentration, temperature and all wetted components before a material is accepted. The pump configuration must also suit the liquid condition, including solids risk, viscosity and suction arrangement.
Shanghai Shangcheng Pump & Valve Manufacturing Co., Ltd. uses the same practical approach: selection should begin with the liquid and operating conditions, then move to configuration and material review.
Chemical Pump RFQ Checklist
Before sending an inquiry, prepare the following information:
- Liquid name and mixture details
- Concentration
- Operating temperature
- Required flow
- Required total dynamic head or discharge pressure
- Specific gravity and viscosity
- Solids, particle size or crystallization tendency
- Suction condition and piping arrangement
- Preferred wetted material, if specified by the process
- Power supply
- Continuous or intermittent operation
- Destination country
The existing project inquiry page is structured around these same operating details, so a complete request can be reviewed without relying on assumptions.
Frequently asked questions
Can I select a chemical pump by chemical name alone?
No. Concentration, operating temperature, liquid properties, solids and the hydraulic duty can materially change the selection review.
Why is total dynamic head needed if I know the pipe size?
Pipe size is only one part of system resistance. Elevation, pipe length, fittings, valves, filters and process pressure also affect the total duty.
Is fluoroplastic suitable for every corrosive chemical?
No. Compatibility must be checked against the exact chemical, concentration, temperature and all wetted components.
When should self-priming service be discussed?
Discuss it when the actual installation has suction lift or a similar inlet arrangement. The practical tank level and suction piping still need review.
Send the process details before requesting a pump quotation.
Provide the liquid, concentration, temperature, flow, head, suction conditions and installation information so the requested configuration can be reviewed against the real duty.
Send project requirements →