AT A GLANCE
Application
• Sewage sludge up to 25 % dry matter content
• 90 metre conveying distance ( 30m vertical , 60m horizontal )
• Flow rate up to 15 m ³/ h
After extensive consultation and a comprehensive review of the plant ’ s specific conditions , SEEPEX experts set about developing a solution that was perfectly tailored to the plant . In the end , SEEPEX was chosen as the general contractor to supply and install two redundant systems . The scope of supply included installation , piping and cabling . Delivery was completed within 6 months . The bespoke SAI system was supplied with a hopper pump ( BTHE 130- 12 ) with a moveable stuffing part for easy removal and access to the rotor side joint and screw conveyor ( Rotor Joint Access ), a dosing pump for lubricant supply , a compressed air system consisting of a compressor and air receiver , and a control cabinet with integrated control . In addition , SEEPEX installed two separate pipelines ( PN16 , DN250 in stainless steel ) over a length of 90 metres ( 60 metres horizontal , 30 metres vertical ), including the necessary sensors and isolation valves . The integrated automation technology - the SAI controller - allows the two outdoor silos to be fed as required .
By reducing the operating pressure , it was possible to use a PN16 stainless steel pipeline . Due to the low pressure level compared to conventional solutions with much higher operating pressures , it was possible to save costs in the purchase of piping .
In addition , the low operating pressure significantly increases the service life of all pump and pipework components . Overall , SAI saves around 20-25 % of energy per year compared to a piston pump . The Rotor Joint Access maintenance concept , with its moveable stuffing part , simplifies pump maintenance and saves costs . It allows quick and easy access to the rotor-side joint for easy maintenance without dismantling the pressure branch or stator . In this way , the innovative SAI system solution greatly simplifies maintenance .
Benefits
• Efficient transport of dewatered sludge with energy savings of 20-25 %
• Low operating pressure
• Minimal maintenance costs ( Maintain in place )
• Overcomes height differences and changes of direction with ease
SEEPEX-Products
• Smart Air Injection system incl . software ( SAI-controller )
• Open hopper pump BTHE 130-12
• PC pump for dosage of lubricants BN 05-12
With these new pumps up and running , the WWTP Hetlingen will have to intervene less frequently during operation and the entire operational side runs more smoothly . Significant energy savings during pump operation will reduce the plant ’ s carbon footprint , boosting their climate protection measures .
Pneumatic dense phase conveying with supporting lubricant minimised friction losses in the pipeline . The characteristic pressure behaviour of SAI is also evident in Hetlingen , where the pipeline pressure in operation is only 2-3 bar . In contrast , hydraulic operation using a piston pump was achieved at up to 70 bar .
For further information , please visit www . seepex . com
82 PECM Issue 69