Queensland Alumina (QAL) is one of the world´s largest aluminum oxide producers and meets around 10 percent of global need. Centrifugal slurry pumps of a reputable, international pump manufacturer are currently used in their production to pump aggressive media with a high solids content.
Medium: Caustic hydrate with solids content >40%
Relative Density SG = 1400 kg/m3 – 1500 kg/m3 (1.4 – 1.5 g/cm3)
Temperature: t = 158˚F (70˚C)
Pressure: p1 = 131 psi (9 bar)
Rotational speed: n = 1,450 rpm
Shaft diameter dN = 3.250” (82.5 mm)
Face materials (seal face and seat): Silicon carbide (Q1)
The EagleBurgmann Solution
The EagleBurgmann HR mechanical seal was utilized to solve for the customer’s seal life issue. A flushing connection and a throttle with self-cleaning profile integrated into the seal housing were provided to aid lubrication of the sliding surfaces and keep out solids. The very small throttle gap means that purging water consumption can be limited to no more than two liters per minute.
HR mechanical seal features:
- Single seal
- Independent of direction of rotation
- Multiple springs stationary
- Seat rotating
- Seat arranged directly behind the impeller
- Spring protection sleeve
The HR seal proved to be the optimal solution and achieved a service life of more than three years, exceeding customer expectations regarding service life. For more information about the HR mechanical seal, please contact us at firstname.lastname@example.org.