Howden WRV, Руководство по обслуживанию

Страница: 21 / 64

20
7.1 GENERAL COMMENTS
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.
When the compressor is being inspected or overhauled it must be dismantled in a clean area.
The inspection overhaul procedure is different between the WRV163 & WRV204 compressors and
the, WRVi255, WRVi321 & WRVi365 compressors due to construction variations. Please ensure
that the correct procedure is used for the size of compressor involved.
Always refer to the sectional and external arrangement drawings.
All fasteners should be torqued to the value specified as stated under Torque Specifications in
Section 9.1 using appropriate torque wrenches.
All lockwashers, tabwashers, ‘O’ rings and PTFE seals must be renewed on assembly. Section 9.2
describes lockwasher assembly procedure.
Special tools to ease dismantling and re-assembly can be provided, as listed in Section 9.3. Details
of these can be obtained from the Compressor Business Unit, Howden Compressors. Section 10
details all Part Numbers of normally replaceable components.