IHF Series PTFE-Lined Chemical Pump

The IHF series is a single-stage, single-suction centrifugal pump whose wetted surfaces are lined with fluoroplastic so that aggressive media only contact plastic rather than bare metal. The published working envelope is 3.5–300 m³/h of flow, 4.5–87 m of head and a medium temperature of −20 °C to 100 °C.

The pump body is a metal casing lined with PTFE, while the pump cover, impeller and liner plate are made by sintering and pressing fluoroplastic onto metal inserts. The shaft seal is an externally mounted bellows mechanical seal: the stationary ring is 99.9 % alumina ceramic or silicon nitride and the rotating ring uses a PTFE filling material, with SSIC industrial ceramics also published for the seal faces.

Because the wetted path is a plastic lining rather than a solid plastic moulding, the pump keeps metal-casing strength while handling any concentration of sulphuric, nitric, hydrochloric, hydrofluoric and acetic acid, strong alkalis, strong oxidising agents and organic solvents. It is applied in chemical, metallurgical, pesticide, pharmaceutical, printing-and-dyeing and paper-making plants, in non-ferrous metal smelting, in acid baths in automotive manufacturing and in waste-water treatment.

• Acid transfer in chemical plants: Moves strong acids and acid mixtures where a fluoroplastic lining is required.
• Non-ferrous metal smelting: Handles corrosive media and electrolytes in smelting and refining lines.
• Automotive manufacturing: Serves acid-bath and surface-treatment circuits in vehicle production.
• Pesticide manufacturing: Transfers aggressive intermediates and formulations in pesticide plants.
• Waste-water treatment: Pumps corrosive chemical waste streams in treatment works.
• Printing and dyeing: Circulates corrosive dye liquors and treatment chemicals in textile plants.
• Pharmaceutical and paper: Moves corrosive process liquids where metal contact must be avoided.

1. Confirm the medium against the published lining coverage before selecting the size, since the lining protects the hydraulic path but not the seal faces.
2. Keep the working temperature inside the published −20 °C to 100 °C window; the bellows seal and the lining are both temperature-limited.
3. Check the seal-face material against the medium: alumina ceramic is the standard published option, with silicon nitride and SSIC ceramics offered where abrasion or chemical attack requires them.
4. Work from the duty point in the 3.5–300 m³/h and 4.5–87 m range, and prefer a trimmed impeller over throttling when the head is lower.
5. State whether the medium contains abrasive particles, because that decides the seal-face and liner-plate material rather than the pump size.
6. Verify the inlet and outlet sizes against the existing pipework using the published port table before ordering.