Vertical long-shaft submerged pump for circulating sulphuric acid in the drying and absorption circuits of a sulphuric acid plant. The hydraulic end sits in the acid sump while the motor stays above the deck, so no shaft seal is exposed to the acid and no suction line has to be primed. The temperature limit follows the acid strength: below 110 °C for 98% H₂SO₄ and below 80 °C for 93% H₂SO₄ — above that the corrosion rate on the wetted alloy climbs steeply, so the concentration and temperature pair must be stated before the material is fixed. Flow 10–1,400 m³/h, head 15–50 m; model designation reads diameter + head, for example 250-38. Running characteristics are stable across the flow range with high efficiency and long service life.
General Specifications
Flow Rate10 – 1,400 m³/h
Head15 – 50 m
Medium Temperature< 110 °C for 98% H₂SO₄ · < 80 °C for 93% H₂SO₄
ConstructionVertical long-shaft, hydraulic end submerged in the sump
Model DesignationDiameter + head · e.g. 250-38
SelectionSeries ranges are for preliminary selection; the final model is selected against the duty point and the printed curve.
Max. Working Temperature< 110 °C at 98% H₂SO₄ · < 80 °C at 93% H₂SO₄
MediaSulphuric acid drying and absorption circuits
Materials & Coating
Wetted PartsAcid-resistant cast alloy — grade fixed against the acid concentration and temperature pair
InstallationMotor above the deck, no shaft seal in contact with the acid
DischargeVertical discharge column alongside the shaft
Typical Media98% and 93% sulphuric acid, drying and absorption circuits
BodyCast iron / cast steel, SS on request
Applications
Sulphuric acid drying circuit Sulphuric acid absorption circuit Acid circulation in fertiliser plants
The concentration-and-temperature pair decides the material
This pump circulates sulphuric acid in the drying and absorption circuits. The published limit follows the acid strength: below 110 °C for 98% H₂SO₄ and below 80 °C for 93% H₂SO₄. Above those pairs the corrosion rate on the wetted alloy climbs steeply, so the concentration and the temperature have to be stated together — a temperature alone does not define the duty.
The hydraulic end runs submerged with the motor above the deck: no shaft seal is exposed to the acid and no suction line has to be primed.
Range and the two circuits
Flow 10–1,400 m³/h, head 15–50 m. The drying circuit and the absorption circuit run at different acid strengths, so the same plant can need two different material selections on two pumps that look identical.
Model designation reads diameter and head, for example 250-38.
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