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The compressor is designed to give long periods of trouble free operation with the minimum of maintenance. A yearly inspection is recommended for all Howden Compressor installations. Some installations may require an annual statutory insurance survey. The purpose of the yearly inspection survey is to check if there is any significant wear of the thrust bearings, slide valve guide block or PTFE seals and, if any wear is found, for these components to be renewed. Where axial movement condition monitoring equipment is fitted to the compressor, a continuous indication of the thrust bearing condition is monitored and the bearing check can be extended to once every two years. It is not anticipated, however, that a major overhaul will be required until approximately after four years operation. After this time the thrust bearings must be renewed.