60t Vacuum Tank Degassing Station
This Tenova stationary-vessel Vacuum Degasser is a high-performance
ladle metallurgy unit designed for advanced secondary steel refining
downstream of the meltshop. Equipped with a hydraulic gantry transfer
car and a powerful four-stage dry mechanical roots pumping system, it
achieves rapid pump-down times and deep vacuum levels to ensure
exceptional steel purity.
Technical Details
Manufacturer: Tenova
Heat Size: 60t
Year of Manufacture: 2005/2008
Type / Scope: Stationary-vessel-type vacuum tank degassing (VD)
station for ladle metallurgy, for a 60t heat, serving the meltshop
downstream of the EAF/Ladle Furnace.
Key technical data:
Vacuum vessel: cylindrical, welded boiler-quality steel plate, open
top with machined flanged rim; internally refractory-lined (refractory
supplied by customer)
Vacuum vessel - overall top diameter: 6100mm; top diameter inside
refractory: 5700mm; internal depth inside refractory: 4330mm; total
vessel height: 4600mm
Vacuum vessel - free internal volume (closed): ~110 m³; weight
(refractory-lined): 23 (48)t
Vacuum off-take duct diameter: 914mm (36")
Vacuum vessel cooling water flow: 30m³/h (seal-ring housing
flooding)
Vessel safety features: aluminium rupture disk near vessel bottom
(emergency discharge on ladle breakout) and vacuum-tight inspection
hatch
Vacuum vessel cover: dished top closure, cylindrical flanged body,
diameter 6100mm, height 1450mm, weight (refractory-lined) 7 (11)t;
cooling water flow 3 m³/h
Vessel cover fittings: observation port with CCTV camera mount,
manual/motorised bath-boil control valves, DN 250 water-cooled port
for sampling/temperature lance and wire feeding
Heat shield (suspended inside cover): diameter 2900 mm, height 520mm,
sight-port hole diameter 360 mm, weight (refractory-lined) 1.7 (2.7)
t; height adjustable ~150 mm relative to ladle rim
Vacuum vessel cover gantry transfer car: lifting capacity 20t, lifting
height 800mm, opening/closing speed 1 m/min, traveling speed 0–15
m/min, track rail gauge 6600 mm, run-way distance ~8m, weight 6t
Gantry car drives: 2× hydraulic cylinders driven by 2× 15 kW
hydraulic pumps; 2× 10 kW transfer motors; piston-accumulator backup
for cover lift/travel on electrical power failure
Ladle freeboard requirement for VD treatment: 800-1000mm (achieved via
new ladle design, see Appendix 3)
Vacuum pumping system: dry mechanical ROOTS-type, 4-stage arrangement
(Stage 1: 4× high-vacuum ROOTS pumps, belt drive; Stages 2–3: 2×
high-vacuum ROOTS pumps each, direct coupling, frequency-controlled,
with tubular water/air heat exchangers; Stage 4: 2× dry primary ROOTS
pumps, belt drive)
Vacuum system performance: total volume to be evacuated ~200 m³;
pump-down time to 67 hPa: 4 min; to 0.67 hPa: 6 min; suction capacity
1600 kg/h DAE 13.3 hPa, 80 kg/h DAE 0.67 hPa; ultimate vacuum pressure
≤ 0.2 hPa
Vacuum system power: total installed motor power 600 kW; peak power
absorption ≤300 kW; average power absorption 150 kW
Germany
Trier 
