7 DELIVERING THE FULL PACKAGE www.parker.com/fes Image 4– MIL-DTL-901E equipment shock testing It is the complete, holistic design of the air intake system which ultimately ensures operational efficiency, reliability and availability is maximized and the vessel is ready to immediately react when called upon. Another common feature for naval marine vessels is bypass (blow-in) doors. These allow unrestricted air flow to the turbine if the filter system is unexpectedly blocked somehow. In this case, the bypass doors open automatically when there’s a very high-pressure loss to allow unfiltered air flow to bypass the filter housing, while ensuring GT operation remains. Again, the performance of these elements and the wider system are dependent on appropriate package design, which in turn demands the highest levels of experience and a deep understanding of aerodynamics, acoustics, computational fluid dynamics and many other requirements in addition to filtration. A comprehensive laboratory and field testing regime is needed to calculate all these parameters precisely and provide optimum filtration performance in a compact footprint with reliability and availability of the asset always at the forefront of considerations. In conclusion, fears of conflict growing and a higher priority given to military security, it is clear that more investment in naval vessels is taking place. Choosing the right partner to ensure gas turbine reliability is therefore critical. However, intake filtration is much more than salt removal performance given the requirement for extremely high velocities and the aerodynamic demands this places on design. There is also the need for a compact footprint and the flexibility to meet GT performance and airflow requirements in a highly challenging and restricted space. There’s the paramount demand for absolute unfailing reliability and quality over decades of service that a vessel type requires. Ultimately, it’s this full package design that ensures naval marine vessels enable our armed forces to provide the military protection we need. For effective gas turbine intake filtration, the necessary design considerations must be included from an early stage of the ship design process. However, the filtration system is much more involved than simply the vane separators, filter and coalescing system. A lot more factors need to be considered and configured when designing an air intake system for a GT. Aerodynamics, acoustics, inlet heating (anti-icing) and enclosure ventilation system design, all play a huge part in optimizing overall system performance. Shock and vibration testing, and performance validation are also a standard requirement for naval applications.
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