HOFFMAN DEFENDER™ Screw positive displacement blower packages for municipal wastewater treatment have flexible configurations and enhanced technical features. Our Screw PD blower packages are the perfect solution for a broad range of environmental applications including municipal wastewater treatment.
Globally, the HOFFMAN DEFENDER Screw packages mean reliability, extreme sturdiness, and compactness. In a competitive global market, our long history of supplying blower solutions to suit our customers' unique requirements sets us apart from the rest.
Our team of highly skilled and experienced engineers is focused on developing blowers that offer maximum benefits to our customers.
In wastewater treatment plants, energy consumption accounts for over 50% of annual costs. The HOFFMAN DEFENDER Screw blower range meets all cost reduction requirements, allowing customers to save between 15% and 30% on energy consumption when compared with other technologies.
Innovative Components & Design
Premium Efficiency Air Ends - The air ends used here are from a state-of-the-art, patented screw blower with 3x5 profile rotors designed with wide-diameter shafts to reduce the deformation caused by internal and external loads, thereby ensuring the blower can work efficiently in even the harshest conditions.
One Package, Two Technologies - Take advantage of the one solution for both lobe and screw blower technologies. Whether revamping plants, or your processes, you can review and compare each technology's benefits for your operation before you commit to buy. Either way, the DEFENDER Lobe and Screw will fit your requirements.
Low Noise - Low noise emissions are ensured by our new discharge and suction silencer design. In addition, cabin enhancements grant noise reduction thanks to the special sound proofing material, upgrade panel thickness, and enclosure air inlet and outlet ducts muzzled with a lined single-chamber plenum and lined bends.
Easy Installation & Maintenance - As it can be transported with a forklift and/or pallet truck, the DEFENDER Screw blower offers easy installation. The electrical system connection is also simple, using the rear auxiliaries cabinet for configuration with a controller. Furthermore, maintenance costs are reduced as every component of the DEFENDER Screw blower has a simple robust construction, thereby guaranteeing a long working life. Thanks to the simple layout of the unit components, all routine maintenance tasks can be carried out from the front of the blower, ensuring easy:
Oil filter replacement
Oil pressure adjustment and air filter replacement
Drive belt replacement
Features & Benefits
Low Life Cycle Costs - The expense of blower ownership is comprised of equipment, installation, energy, and maintenance costs. Equipment and installation are a one-time expense, while energy and maintenance are continuous costs of ownership. DEFENDER Screw ensures a high level of efficiency (>75%) within a wide compressor rotation speed range reducing energy consumption. In addition to its robust construction and use of minimum parts contribute to high reliability and long intervals between maintenance.
Flexible - The DEFENDER Screw blower offers a turndown capability in flow to meet the needs of the customer. It is also suitable for intermittent use with frequent stops and restarts to best satisfy the specific process requirements. The belt drive ensures the right capacity for the application and also allows the installation of the motor most suitable for the power absorbed by the unit (therefore operating at optimum efficiency).
Quiet Operation - The optimum efficiency of the internal compression, guaranteed by an innovative rotor profile, means less noise during the compression phase. The low rotor rotation speed (max. 6,000 rpm) and the absence of a step-up-gear, along with special silencers and noise-reducing enclosure (also available without sound hood - WL version), guarantee low noise levels from the compressor; thus, allowing installation in a variety of applications.
Reliable - The painstaking design and meticulous choice of each component of the blower, together with a low operating speed, make the DEFENDER Screw extremely reliable. At the same time, the controllers ensure optimum machine operation via the continuous monitoring of the operating parameters. The functions of remote diagnostics and predictive maintenance are proven to contribute to reducing downtime.