the air is so bad that it poses an increased risk of related illnesses for people if it is left unfiltered Air filtration systems can significantly improve the quality of urban life Retrofitting of filter systems in existing building services systems of schools or hotels is often difficult It is expensive and technically complicated the developer of urban air purification systems offers a clever solution to this issue: the Purevento Mono-Unit the management of Purevento GmbH has decided to offer smaller models in addition to the already existing urban air purifier ‘The high demand confirms that here is a considerable need for modular air purifiers for indoor applications,’ explains Robert Krüger ‘Our team has developed three models with very compact dimensions,’ says Krüger Diverse application range for the new purification class The application areas vary depending on the model: Based on the compact model M-20 which is designed for indoor use such as hotel lobbies or terraces the M-27 and M-30 air purifiers are designed to clean smaller public spaces such as schoolyards For larger rooms or areas multiple air purifiers can also be combined In order to ensure optimum air quality in every case Purevento provides simulations for every application to interested parties The compact dimensions of the air filtration systems allow them to be individually configured and adapted to the respective environment: for almost invisible use in hotels or corporate headquarters or the deluxe model for integration into residential living spaces ‘This is how we make good air in living spaces possible with a device that is hardly noticeable visually or acoustically,’ says Andreas Hildebrandt urban air purifier project manager at Purevento GmbH.   The functional principle: simple and highly effective The system sucks in the polluted air right in front of the unit and moves it through the first purification level where it gets rid of approximately 80-90% of the fine particles This pre-purified air is passed through a second filtration level where up to 85% of the gaseous pollutants (including nitrogen oxides and ozone) are filtered out and then returned into the environment The intake system has a specially designed engine which is very powerful despite low energy consumption As soon as the saturation limit of the filter media has been reached they are replaced on site and then incinerated together with the pollutants in an environmentally friendly manner at high temperatures (at specific disposal companies) without leaving any residue The urban air purifiers are also designed to monitor themselves: A sensor system constantly monitors the air quality at various points so that the integrated control software can adjust the cleaning performance of the units accordingly The new compact cleaners in three performance level models Three models of the Mono-Unit are planned for series production The most powerful model reaches air purification rates of up to 30,000 m3/h All compact cleaners operate with an external power supply The configuration of the filter media inside the unit enables the particularly compact external dimensions of this model which means that they can be easily moved around at any time For more information and technical specifications please go to https://www.purevento.com/purevento-stadtluftreiniger/#technologie https://www.purevento.com/purevento-stadtluftreiniger/ Purevento is a self-financed sister company of trittec AG from Trittau in Southern Schleswig-Holstein The urban air purifier is designed to remove highly problematic particulate matter contamination ozone and nitrogen oxides from urban air near traffic It can also be used for air purification in heavily polluted sensitive outdoor areas The first series products will be delivered this year The inventions and designs for the air purifier have been patented worldwide Robert Krüger is the CEO of Purevento GmbH For more information about the products please go to www.purevento.com. Agency for public relationsDederichs Reinecke & PartnerManuel KriegTel.: +49 40 20 91 98 278E-Mail: Manuel.Krieg@dr-p.de The two Terex tower cranes spent about twelve months in view of the world-famous St Pauli Landungsbrücken Piers in Hamburg while working under unique conditions.The challenge: Building a seven-story office building in an urban downtown setting with unique challenges such as space and electricity concerns On behalf of Köster AG, Trittau-based Proschwitz GmbH used its Terex CTT 91-5 and CTT 161A-8 flat top tower cranes while helping build the new seven-story BOA VISTA office building in Hamburg, Germany. The two Terex tower cranes spent about 12 months in view of the world-famous St. Pauli Landungsbrücken Piers in Hamburg while working under unique conditions. “Projects in urban downtown settings are always associated with special challenges, and that’s especially the case when it comes to a big, lively city like Hamburg,” explains Proschwitz GmbH General Manager Detlev Proschwitz. The first challenge was the lack of space around the areas where the two Terex tower cranes would be erected. In fact, just getting the cranes from Proschwitz’s headquarters in Trittau to the worksite with 13 trucks was already a small logistical challenge despite the short distance of 22 miles – after all, cramped downtown areas are hardly the natural habitat of heavy goods vehicles. Despite this and the limited space conditions at the actual worksites, however, the Proschwitz team was able to erect the two cranes on time, with each one taking only one day and three assembly technicians. “We didn’t have any more time available anyway, as we had to keep the necessary road closures to a minimum. That’s where the CTT cranes’ ease of erecting really came through for us,” Proschwitz emphasizes.  In addition, the two Terex tower cranes had another feature that made it seem as though the units were simply destined to work on the project at the Hamburg site — their variable frequency drives, which guaranteed low inrush currents, protecting the city grid from unmanageable voltage fluctuations. “If there was one thing we really didn’t want to do, it was to leave the Landungsbrücken Piers without electricity,” as Detlev Proschwitz succinctly puts it. For the project at the St. Pauli Landungsbrücken Piers, the Proschwitz team erected the CTT 91-5 flat top tower crane free-standing on a C38 cruciform base, and the CTT 161A-8 flat top tower crane on cast-in-place anchors. With a jib length of 131 feet and a hook height of 162 feet, the CTT 161A-8 was perfectly set up to lift construction materials weighing up to 9,149 pounds from the jib tip. Its maximum lifting capacity was 17,637 pounds. The CTT 91-5 was set up with a jib length of 98 feet and a hook height of 134 feet. With this setup, it was able to pick up loads of up to 7,275 pounds. With these configurations, the two Terex tower cranes performed their work smoothly and reliably for a total of 12 months, even when exposed to wind and inclement weather. As a result, Construction Manager Robert Friske from Köster AG, the primary contractor on the project, was also completely satisfied with the Terex machines. “The high-pressure deadlines normally involved in this type of construction projects mean that we can’t afford any equipment downtimes. This means that dependable machinery, such as these two tower cranes, is crucial to a successful project completed on time,” Friske said. After the CTT 91 was dismantled, the CTT 161 was disassembled in six hours with the help of a mobile crane. Vision and Automation Solutions for Engineers and Integrators Worldwide At the SPIE Defense & Security Symposium (Orlando USA; www.movimed.com) presented an infrared (IR) system for nondestructive testing of aircraft fuselages Developed by Automation Technology (Trittau the JetCheck system uses a variant of IR thermography known as “lock-in” thermography to analyze samples under test the sample to be tested is heated at its surface by an intensity-modulated source This heat penetrates into the interior of the sample as a thermal wave and any change in the properties of the sample material such as cracks cause a change in the propagation characteristics of the wave After the thermal wave is reflected to the surface of the sample it becomes superimposed (or locked in) onto the initial wave such that any defect is revealed by a local change in the phase angle By recording the surface temperature of the sample with an IR camera the temperature-time function of the image can be analyzed on a host computer the internal structure of the component and its interior defects are revealed Depending on the modulation parameters of the heat source during the measurement different depth ranges within the image can be displayed “Aircraft hulls are manufactured using a variety of different materials and fasteners such as aluminum and rivets and other composite materials,” says Tarin Other factors such as condensate and water inclusion can also cause cracks at high altitudes.” the JetCheck system inspects several square meters of an aircraft within minutes (see figure) the exterior is heated to no higher than 40oC using an array of high-power halogen lights so as not to cause damage or deformation to the fuselage The halogen-lamp array is modulated with a sinusoidal waveform The system measures and evaluates differences in the temporal behavior of the heat at the object surface and defects appear with excellent contrast “The advantage of using lock-in thermography with phase-angle image evaluation is that external effects such as emissivity of the material and sunlight do not affect the results of the measurements,” says Tarin thermal images are captured by a ThermoVision SC 6000-HS cooled focal-plane-array (FPA) IR camera from FLIR Systems (N 14-bit digital images to a PCI-based Camera Link frame-grabber board resident in a host PC running Windows XP the IR FlashLink frame-grabber board also contains the circuitry for generating the sinusoidal stimulus signal to the halogen-lamp array and performs the synchronized IR-image recording running on the PC allows for test setup and phase and amplitude thermal-image analysis The software also stores live images from the camera in real time and calculates the phase image from the IR data “The increasing number of air travelers combined with a greater number of aging commercial jetliners has led to more stringent inspection and maintenance procedures Inspection methods that can detect minute defects that could lead to catastrophic failure are required to keep air travel safe,” says Tarin After official approval by the US Federal Aviation Administration (FAA; Washington lock-in thermography is now being used by companies such as Lufthansa Technik (Hamburg Germany; www.lufthansa.com) to perform aircraft fuselage inspection “Research in lock-in thermography was first studied by Lufthansa Technik in 2001,” says Peter Feddern Since gaining acceptance by Boeing and the FAA it has been used for inspecting the bonds between the skin panels and the inner structures of the fuselage on the Boeing 737 This ensures that no cracks will appear that affect the safety of the airplane One complete inspection takes approximately 100 hours This represents a time-saving of about 1000 hours.”