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Axial flow chemical circulation pumps like the RSU Series are intended for large capacities, and achieve favourable NPSH values by means of a specially designed feed screw. This makes them particularly suitable for the circulation of various concentrations of acids, and of old or weak contaminated acids.

Their areas of application are acid reconcentration plants and spent acid evaporation plants, as well as the regeneration of waste acids and reaction liquors.

Type RSU circulation pumps have proved to be excellent in evaporation plants for weak H2SO4 acid, which occurs, for example, in the production of TiO2. The circulation pumps used in these processes perform excellently, pumping acids at concentrations from 20 % to 95 %, at temperatures of up to 200 °C, and which contain up to 35% of solid matter.

The Silicon Iron castings used are more than a match for this type of complex corrosive and abrasive service at high temperatures. The material is a Silicon Iron alloy, containing 15% Si, which has a very high resistance to corrosion in H2SO4 at any concentration, even at high temperatures.

Specifications

• Q max: 8,800 gpm (2,000 m3/hr)
• H max: 16 ft (5 m)
• T max: 300 deg F (150 deg C)
• Materials: Silicon cast iron

Construction Features:

• All pump components coming into contact with the medium are manufactured from cast silicon iron.
• To protect it from external forces the pump casing is embedded in an S.G. Iron, GGG 40.3, armoured housing by means of a resistant sealing compound.
• The bearing bracket is also made of cast iron GGG 40.3.
• The hydrodynamic shaft sealing is achieved by means of two auxiliary impellers and an additional pneumatic stationary seal (Design B2P).

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