Although the high velocity Vane Coalesces Vane (VCV) demister system was originally thought to be singularly the correct application to offshore platform gas turbine installations, it is evident that in its original form it cannot comply with the operator requirements. The attempt by filter manufacturers to improve their V.C.V. systems with additions of filter banks is indicative of the failure of the V.C.V. system. One major contributing factor to the failure of the V.C.V. system has been the low 'moisture-in-air' content. Although pre-filtration has played a major role in the upgrading of existing installations, its application to future projects should be considered carefully. With the apparent advantages of the low velocity/high efficiency filter system over the V.C.V. system (or its adaptations), it should be considered why more existing units have not been re-fitted. Firstly, the application of the gas turbine has to be considered. The power generation sets are generally oversized to cover for the massive peak requirements of the drilling rig and other platform power requirements, and they are also installed with a standby facility. This 'safety in numbers' approach allows an operator to have regular maintenance shutdowns for filter servicing and compressor washing. Remembering that the sulphur in fuel content is generally low in the North Sea, and temperature control of the power turbine is possible with an oversized machine, the engines are not in danger of suffering hot gas corrosion and so pre-filtration of V.C.V. systems has been the most popular acceptable option as an interim stop-gap measure. Secondly, it must be remembered that as the gas turbine market is a very competitive one, manufacturers naturally wish to keep their installed package size and weight down to a minimum. To do this, they have in the past offered single lift modules which incorporated the high velocity system. In some cases it was not possible to provide the same facility with low velocity/high efficiency filters. It is the machine that is used on compression or water injection and is essentially base load, and where the minimum number of shutdowns is required, the low velocity/high efficiency filter system offers the full protection requirement. The emergence of high capacity high efficiency filters in conjunction with the weight savings from lighter stainless steel constructions, will bridge the gap in physical size and weight between the two types of system.


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    Title :

    Current trends of air filtration associated to offshore platform based gas turbine intake systems


    Additional title:

    Luftfilter im Ansaugtrakt von Gasturbinen auf Offshore-Plattformen


    Contributors:


    Publication date :

    1983


    Size :

    22 Seiten, 9 Bilder, 6 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English





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