Maintenance of triaxial cells
Contents
1. ed RAL DI GDS INSTRUMENTS LIMITED IIN H l h t World Leaders in Computer Controlled Testing e DS ee Systems for Geotechnical Engineers and Geologists Hardware Triaxial Testing Systems Maintenance of Triaxial Cells 1 Bishop amp Wesley B amp W Cell The B amp W Cell is virtually maintenance free It is necessary to keep the cell clean and dry when not in use It is also necessary to prevent soil particles from falling into the gap around the base pedestal ram as this gap leads to the Bellofram rolling diaphragm which can be punctured or worn by a build up of soil particles The cell friction should be checked using the procedures defined in the user manual on a regular basis monthly If it is excessive the Bellofram should be washed out with a water jet while the cell is inverted If this does not cure the friction problem then the cell must be dismantled and the Bellofram changed While the cell is dismantled it is a convenient time to grease the linear bearing guiding the ram The lower chamber needs to be checked on a regular basis monthly to ensure that it efficiently de aired However it is unlikely that air will enter the lower chamber because the lower chamber and the lower chamber pressure controller form a closed system 2 GDS 40 KN 38 50 70 100 Static Triaxial System The System is virtually maintenance free It is necessary to keep the cell clean and dry when not in use It is also2. necessary to keep soil particles from collecting in the area around the ram as this can lead to wear on the lip seal protecting the O ring on the ram On an annual basis the front panel should be removed and the ballscrew cleaned with a clean dry cloth and re greased 3 Maintenance for GDS 7 KN 38 50 Motorised Cell The System is virtually maintenance free It is necessary to keep the cell clean and dry when not in use It is also necessary to keep soil particles from collecting in the area around the ram as this can lead to wear on the lip seal protecting the O ring on the ram Inspect the cables suspending the cell top for wear monthly Replace any suspension cables with obvious wear fraying or cuts GDS Helpsheet 112 Page 1 If the pulleys supporting the cell raising and lowering mechanism should start to squeak then an application of light machine oil to the pulley hubs will be helpful8 channels of 16 bit data acquisition Each channel can be user defined with gain and range span settings 5 Volts supply voltage is available individually for each transducer GDS Helpsheet 112 Page 2
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