For the rehabilitation of a drinking water pipeline in the district of Aalen, 200 km north-east of Munich, Germany, the Denso Group Germany protects weld seams from corrosion very quickly and efficiently using a new laying method that floats in water.
For this method, the pipeline was first laid in the water: Just ten minutes after applying the Densolen-AS50 tape system to the weld seam, the pipe was pushed into a tunnel flooded with water. The pipeline was then drained four months later. This is impressive as pipelines are normally not immediately and permanently exposed to corrosive media. The test results provided by the “Verband der Fernwasserversorgung” (Remote Water Supply Association) prove: The standard requirements of DIN EN 12068 for a high-quality protection of the weld seams are satisfied.
Direct flooding and extended operation in water are major challenges for field joint applications. This unprecedented method shows: The three-ply Densolen tapes fuse together very rapidly. A diffusion-resistant protective hose is quickly generated, with reliable performance even when permanently exposed to fluids. The single-tape system was applied in at least a three-layer wrapping using the engine-driven Densomat-11 application device.
The drinking water pipeline is one of the region’s main arteries. One of the two steel pipelines, with a nominal diameter of DN 1200, was restored for long-term use. Water flows through two parallel tunnels over almost two kilometres at 1,800 litres per second. The construction measure is expected to be completed in the spring of 2019.
Measurement, Instrumentation, Control & Automation Plant Construction, Engineering & Components Valves, Pipes & Fittings Water & Waste Water
New product for monitoring emissions
The Gas 222.15-MA model by Bühler Technologies is a new, innovative product to improve emissions monitoring in shipping.
In the interest of protecting the environment, monitoring emissions in shipping is gaining importance. Here the initial focus is on large-scale emitters such as cruise ships, container ships and tankers.
Depending on the fuel quality, in addition to CO2 and H2O, these ships emit a mix of various pollutants. Similar to large combustion plants, gas analysis in maritime applications also serves monitoring pollutant emissions as well as controlling the combustion process.
Bühler Technologies is one of the worldwide leading suppliers of gas analysis components and systems. However, maritime applications pose additional requirements with respect to equipment and components compared to stationary applications. For example, although the hulls are certainly designed for the specific requirements with respect to strength, much like the element they travel, they are never at rest. Due to the water movement and particularly the running machines, the entire ship is always more or less vibrating. Sometimes even at the multiple of gravitational acceleration. There’s a good reason why the marine and off-shore sector require certified products.
Another requirement is based on the moisture in the ambient air. In addition to other extractive gas analysis components, Bühler Technologies has now developed a probe approved for this application. The 15-MA version of the GAS 222 series meets the broader requirements yet still offers the well-known benefits such as toolless filter change and very compact size. With the newly designed insulation and the convenient terminal box, the protection class was raised to IP 66.
One step ahead
Gas odorization for networks up to PN 16
According to the German Energy Agency (dena), biomethane production in Germany may increase as much as ten times over – from currently 9 terawatt hours to about 100 – by 2050. What is more, natural gas is the most important energy source for private households and accounts for 44 percent of the heating market. Before natural gas or biogas is fed into commercial supply networks, it must have an odorant added to it. Odorants serve as a warning in case of leakage. Since the last few years have been marked by a trend toward decentralized production, Lewa has added the MAH 4 size to its micro-metering pump portfolio as a proactive measure for meeting the expected increase in demand. The new unit can be used for odorizing with mercaptans or tetrahydrothiophene at a throughput rate of up to 12,500 Nm³/h. The pump covers the flow range from 200 to 250 ml and can be used as a cost-effective solution in accordance with DIN-EN 1333 for gas networks up to PM 16. At this year’s Gat/Wat trade fair, the company is presenting the new pump model for biogas, natural gas, and liquefied petroleum gas odorizing systems alongside many other products in hall 07 at booth C016.
“Back in early 2018, we started getting more requests for odorizing gas volumes of approximately 12,500 Nm³/h, to the point where it just made sense to design a pump specifically for that amount,” said Walter Richter, Sales Manager for Gas Odorization at Lewa. “The right way for us to respond to this trend was to add an intermediate size, the MAH 4, to our hydraulically actuated and solenoid driven micro-metering pumps from the MAH, MBH, and MLM series. The new size meets the requirements for this range exactly.” The new unit closes the gap between the MAH 3 and the MAH 5 – something that had previously been done using the larger MLM 15 series. However, the stronger stroke solenoid made that design over-dimensioned and less cost-efficient in some cases. Neither the MAH 3 nor the MAH 5 units from the same series were cut out for the job. There was always one of two problems: either they could not manage to pump at the required output of 16 bar, or they could manage a sufficient flow rate at 600 ml but were not designed for the necessary discharge pressure.
The MAH 4 micro-metering pump as a cost-efficient solution
The pump experts at Lewaclosed a gap in the series by developing this unit. The MAH 4 makes it possible to odorize gas volumes of up to 12,500 Nm³/h with precise metering and in a flow range of 200 to 250 ml. Like all solenoid-driven diaphragm metering pumps from Lewa, the MAH 4 also consists of an electromagnetic drive with stroke setting, a pump head with metal diaphragm and a control system contained in a separate housing. “The metering pump is actuated with pulses,” explained Richter. “The discharge stroke is executed by the armature of the magnet. The suction stroke takes place after switching off the electrical pulse using the force of the thrust spring.” The highly reliable, robust pump features a safety switch. An overload – due to a closed valve in the discharge line, for example – automatically leads to magnet standstill, as its force is limited. “In the worst case, a closed valve in the suction line would, cause cavitation,” Richter added. “After the faults are remedied, the pump simply continues pumping.”
Under the same basic conditions, the MAH 4 stands out for its metering accuracy of ± 1 percent and, thanks to the wide control range up to 1:1,000, outstandingly high metering flexibility. Further, its design is absolutely odor-tight and leakage-free, safe from dry runs and features high process reliability. The only difference between the new MAH 4 and the proven MAH 5 is that the new size has a different inner diameter for the plunger and bushing. Both dimensions were reduced from 5 to 4 mm. Thanks to the adjustments and optimizations made to those dimensions, the MAH 4 serves as a cost-efficient solution for the specific range of applications and is perfect for its requirements.
Lewa at Gat/Wat 2019: hall C, Stand C016
Process belt solutions
Integrated filtration expertise
Pioneering mesh designs presented byGKD – Gebr. Kufferath AG at Filtech. Whether for water processing in large industrial plants or continuous vacuum belt filter systems in the environmental and mining industry: At the leading international trade fair for filtration and separation technology, the company once again highlights its integrated solution competence for filter media and process belt solutions in Cologne. With its special mesh structure and seam technology, the Vacubelt filter belt range guarantees efficiency and safety in exacting dewatering processes. In process water filtration with particles larger than 500 μm, the relatively new spiral fabrics produced are also in high demand. Alongside large-format mesh samples, the knowledge of process requirements that the filtration and process belt specialists have gathered over many years makes them sought-after contacts for discussing specific issues and solution models.
In view of the growing global demand for phosphorous, potash, and lithium, expanding extraction capacities and improving production efficiency are critical to the success of the global mining industry. This is where the different belt types of the Vacubelt range, made of polyester monofilaments, are able to make a vital contribution. All Vacubelt filter belts share the core characteristics of robust transverse stability, low crease formation, smooth surface, good cake discharge, and excellent cleaning behavior. What’s more, their improved seam design contributes to greater process reliability. Its minimal opening at the seam means that the extremely flat PAD seam reduces particle penetration. The company further decreases this seam opening by inserting filling threads, thereby further lowering the risk of particle penetration. These filler threads are supplied with the belt and inserted before the clamps are closed. This means that there is no need for the flaps required by other manufacturers. The advantages of the firm seam design are clear: wipers are not stressed by partial raised sections and the seam itself is also subject to less wear.
For dewatering of phosphogypsum, the firm offers three thermally treated single-ply vacuum filter belts specifically designed for particular processes and applications in the form of the belt types Vacubelt 3354, 3356, and 1003. With air permeability of 200 to 350 cfm and mesh apertures of 150 to 340 μm adapted to the respective plants, they guarantee constant high dewatering performance. As such, these belts in widths of up to 4.35 meters and lengths of up to 70 meters fulfill the highest service life and dewatering requirements.
In potash fertilizer production, the Vacubelt 5060 filter belt has proven its worth many times over. With apertures of up to 470 μm and air permeability of 290 cfm, this belt type reliably withstands the high temperatures and corrosive conditions that are typical of this process.
The Vacubelt 2015 filter belt has been the globally established standard in the field of FGDP gypsum dewatering for many years. The small aperture of 50 μm – coupled with air permeability of 55 cfm – justifies its superiority over conventional belts for dewatering the gypsum suspension produced during flue gas desulphurization. Faster dewatering, greater pore density, less tendency to clog, thermal resistance, and very good cleaning properties make the Vacubelt 2015 belt type the vacuum filter belt of choice for both new systems and retrofitting existing power plants.
The same belt type is currently also setting new standards in lithium dewatering in vacuum drum filters.
In cooling lubricant filtration, the robust Vacubelt 3354 filter belt made of polyester wires is a proven alternative to the usual polypropylene products available on the market. This belt type reliably retains swarf and particles abraded from the grinding wheel without the addition of filtration aids, even with thin filter cakes.
In industrial laundries, the spiral fabrics that GKD produces entirely in house are becoming something of an insider tip for process water treatment with particles larger than 500 μm. Thanks to their unusually high performance, this product range, which made its debut at last year’s Filtech, is therefore also recommended for all other filtration processes requiring similar separation performance to washing water treatment in industrial laundries.
GKD at the Filtech 2019: Hall 11.1, Stand G3