1 year ago

MDA Technologies 5/2016

MDA Technologies 5/2016

01 Aker Solutions

01 Aker Solutions Engineering Project Manager Jarle Skjetne and the Siemens commissioning team SM120 CM converter can be injected back into the supply line. The energy recovery capability of the Sinamics SM120 CM means that Aker can operate the test stand with low associated losses. Tackling the most difficult challenges in the sector With its new Sinamics SM120 CM converter, Siemens has simultaneously addressed several challenges for one of the most innovative suppliers to the oil and gas industry. The converter has enjoyed considerable interest in the oil and gas industry as a result of its low weight when compared to other models and its compact dimensions. The transformer and control unit of the Sinamics SM120 CM are not integrated in the converter itself, which allows them to be separately mounted. This boosts the degree of flexibility for applications where space and weight represent critical factors. The transformer can be located outside engine rooms that tend to be narrow. Besides saving space, this has another advantage – expensive measures to cool the room are not required as the transformer is placed outside. The Sinamics SM120 CM has a modular design, employing multilevel converter technology (M2C) where several low-voltage cells are connected in series. The customer decides how many of these cells are connected in series. The concept is scalable and can be adapted to the power required. The modular design also facilitates a redundant configuration. If one of the cells develops a fault, then it is automatically bypassed and can be replaced the next time maintenance is carried out. This means that a sudden defective cell does not negatively impact converter functionality. Further, Sinamics S120 CM is equipped with modular multilevel technology. The voltages are superimposed on one another so that the output voltage waveform is similar to a sinusoidal waveform. This results in low-line harmonics and reduces the load and stress on the motors and cables. 03 Sinamics SM120 Cabinet Modules frequency converter 02 Sinamics SM120 CM showing the cell frame for uninterrupted operation Three weeks of testing in Tranby, Norway The commissioning of the Tranby Technology Manufacturing Center was scheduled for summer 2015 – and checking out the various systems was completed on time before the actual test was to commence. Jarle Skjetne, the project test manager at Aker Solutions, explained that preparations for the test represented a real challenge. It had to be ensured that everything functioned satisfactorily before the actual test could commence. “Commissioning was successful. We carried out an extensive test program for the motor: Vibration levels, torques, motor power and temperatures were measured to ensure that none of the limit values were violated”, explained Skjetne. The test lasted three weeks. Several customers, who were also involved in the development project itself, participated in the test. Based on this test, Aker was able to demonstrate to customers that the company can supply the solutions that it had committed to. “The positive feedback clearly indicated that with Sinamics SM120 CM, we are on the right track. The next development steps will mean that this drive will perfectly supplement our medium voltage portfolio”, explains, Stefan Obst, Product Manager for Sinamics SM120 CM in Germany. Photographs: lead Aker solutions About Siemens Siemens is a global powerhouse focusing on the areas of electrification, automation and digitalization. One of the world’s largest producers of energy-efficient, resource-saving technologies, Siemens is a leading supplier of systems for power generation and transmission as well as medical diagnosis. In infrastructure and industry solutions the company plays a pioneering role. As of September 30, 2015, Siemens had around 348,000 employees in more than 200 countries. In fiscal 2015, the company generated revenues more than € 75 billion. MDA Technologies 5/2016

Non return valves with advanced design and higher performance As Aristotle in his writing on metaphysics said “The whole is greater than the sum of its parts.” In the context of machine and their individual components, this is all the more true in today’s world of globalised competition and high cost pressures. Today components are no longer viewed as just individual parts of the system that only have to meet the technical requirements. Instead, their impact on the cost effectiveness, availability and energy efficiency of the entire system comes into play. To optimize the total cost of ownership, even the smallest elements of the system such as non-return valves need to work reliably over a long period with high performance. Non-return valves, also known as check valves, allow flow in only one direction and prevent return flow in the opposite direction. What looks quite simplistic – a “one-way flow principle” – is actually a sophisticated technology that has been refined over time. In developing the new series of these valves, the specialists at Bucher Hydraulics had clear objectives: to increase the performance without changing the pressure differential, and to optimize the cost. Bucher’s expertise was crucial for creating a new design of screw-in non-return valve. Focussing on customer requirements, the company undertook an in-depth exploration of the technical possibilities in the non-return valve technology for producing improved performance, increased availability of the complete machine and energy efficiency. Usually incorporated into hydraulic control blocks, check valves are used in both industrial and mobile applications. From excavators to injection moulding machines – all application requirements today are characterised by comparatives such as smaller, more economical, and more powerful. For this reason, it is a distinct advantage for system integrators and end-users if they can incorporate smaller valves with a higher performance. Small design modifications deliver big impact The developers at Bucher Hydraulics put the previous series of check valves on the test stand and questioned its cross-sections, its MACHINE ELEMENTS Tiny yet vital: Non-return valves which are tiny compared to large machines like mobile cranes and harvesters are vitally important for these giant machines to perform to their maximum ability MDA Technologies 5/2016


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