Material Recommendations (room‑temperature, sorted by cost‑performance)
- 304 Stainless Steel
Fully suitable for 20% dilute nitric acid at room temperature with the best cost‑performance. Use silicon carbide/silicone carbide mechanical seals.
- 316L Stainless Steel
Better corrosion resistance; preferred for higher‑temperature or long‑term continuous operation.
- Fluoroplastics (PVDF/PTFE/PP)
Fully corrosion‑resistant and more economical, ideal for small‑flow acid‑base transfer applications.
❌ Unsuitable materials: cast iron, carbon steel, aluminum, copper (rapid corrosion will occur).
Common Pump Types
1. Magnetic Drive Pump (Top Choice, Leak‑Free)
Materials: 304/316L magnetic drive pump, PVDF fluoroplastic magnetic drive pump
Advantages: no shaft seal, zero leakage, safe for 20% nitric acid transfer.
2. Self‑priming Pump (for self‑priming requirement)
Materials: 304 self‑priming pump, PP/PVDF self‑priming pump
Application: tank feeding, suction‑lift scenarios.
3. Vertical / Horizontal Centrifugal Pump (high flow rate)
304/316L horizontal centrifugal pump, widely used for industrial circulation and transfer.
Quick Selection Rule
- Room‑temperature 20% nitric acid: 304 magnetic drive pump or fluoroplastic magnetic drive pump
- Temperature above 50 °C: use 316L or PTFE‑lined pump
- High flow rate: 304 horizontal centrifugal pump
Seal Matching
- Shaft seal: Silicon carbide vs silicon carbide
- Gaskets/O‑rings: Fluoro‑rubber (FKM)