Situation
Passavant® Cable-Operated Bar Screens COB & Noggerath® Spiral Conveyor SF
Doha, Qatar
Replacement of 4 Multi-Rake Bar Screens with the Passavant® Cable-Operated Bar Screens in 32A PS in Doha, Qatar
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Four Multi-Rake bar screens of a competitor were in operation in the pumping station PS 32A in Doha, Qatar at different locations. However, the operator was experiencing more and more differences with these screens for prolonged use. The Multi-Rake bar screens were not able to carry and lift the heavy items and bulky screenings such as wood, stones and metal parts from the bottom of the channel. The rakes were bent and the chain and the lower sprocket wheels was broken several times. Due to the significant depth of the pumping stations (12 m & 15 m), the repair work was always associated with an enormous amount of personnel. The Aqseptence Group has been asked for advice and for a quotation to provide reliable and robust screen capable of handling this application at large channel depths. The proven Passavant® COB-C was proposed and finally commissioned by the customer.
Solution
Additionally the two Multi-Rake Bar screens supplied at the lower pumpstation (LLPS) were replaced by two Passavant® COB-C screens using the existing conveyor and wash compactor. The other two Multi-Rake Bar competitor screens at the HLPS Multi-Rake Bar screen were replaced as well by two Passavant® COB-C screens and screw conveyor –SF 360. The whole equipment has been connected to the existing wash compactor. All level sensors and control panels were provided to ensure a fully automatically operation of the whole system. The new screens are running.
Advantage
- Intelligent PLC control enables COB screen to remove even extremely bulky screenings or screenings deposits in front of the screen by repeating the cleaning cycle from every position as often as necessary
- No sprocket wheels within the submerged area
- Slack-rope control for easy operation
- All maintenance from above the water level
Technical Data
| Passavant® COB-C 1500 x 4500 x 50 @ LLPS-PS | Passavant® COB-C 1500 x 4600 x 50 @ HLPS-PS | |
|---|---|---|
| Quantity | 2 | 2 |
| Max. flow rate | 7,560 m³/h per screen | 9,720 m³/h per screen |
| Channel width | 1,500 mm | 1,500 mm |
| Channel depth | 15,200 mm | 11,800 mm |
| Gap width | 50 mm | 50 mm |
| Bar rack height | 4,500 mm | 4,600 mm |
| Installation Angle | 80° | 80° |
| Noggerath® Spiral Conveyor SF-360 | |
|---|---|
| Throughput capacity | 5 m³/h |
| Trough width | 360 mm |
| Length | 6,800 mm |
