TECHNICAL SERVICES GROUP OPERATING PROCEDURE INTERNAL USE ONLY VACUUM

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GUIDANCE NOTE ON THE USE OF VACUUM DRYING TO DRY CORE SAMPLES FOR WA 733

Technical Services Group

Operating Procedure

Internal Use Only


Vacuum Drying of Core Samples and Fatigue Beams

OP475


Revision: 1.0 Date: July 2014 Page 5 of 5



  1. SCOPE


This procedure describes the method for the vacuum drying of core samples and fatigue beams


  1. REFERENCES


Nil


  1. DEFINITIONS


Nil


  1. APPARATUS AND MATERIALS




4.1 SET UP


As per diagram or similar:


TECHNICAL SERVICES GROUP OPERATING PROCEDURE INTERNAL USE ONLY VACUUM



    1. DESICCATOR



TECHNICAL SERVICES GROUP OPERATING PROCEDURE INTERNAL USE ONLY VACUUM TECHNICAL SERVICES GROUP OPERATING PROCEDURE INTERNAL USE ONLY VACUUM



TECHNICAL SERVICES GROUP OPERATING PROCEDURE INTERNAL USE ONLY VACUUM TECHNICAL SERVICES GROUP OPERATING PROCEDURE INTERNAL USE ONLY VACUUM


5.0 PROCEDURE


The following procedure shall be followed.


  1. Place dried silica gel inside the bottom of the desiccator


TECHNICAL SERVICES GROUP OPERATING PROCEDURE INTERNAL USE ONLY VACUUM



  1. Place a rack on top of the silica gel.


  1. Place the specimens in the Desiccator and place a cup with silica gel in with specimens.


TECHNICAL SERVICES GROUP OPERATING PROCEDURE INTERNAL USE ONLY VACUUM



  1. Place the lid on the desiccator (make sure that the rubber ring around the desiccator is not damaged. The top lid of the desiccator must be on square and centred and the front and back latches are securely fastened)


TECHNICAL SERVICES GROUP OPERATING PROCEDURE INTERNAL USE ONLY VACUUM



  1. Ensure that the air tap is open.


  1. Turn the pump on.


  1. Check that the pressure gauge is continuously increasing.


  1. Leave the samples in the vacuum for a 4 hour drying period.


  1. After 4 hours close the tap to the desiccator and turn the pump off.


RELEASING THE VACUUM SLOWLY AND SAFELY


  1. Remove the vacuum hose from the desiccator. Use the end of the hose to depress the valve and slowly allow the air to vent into the desiccator.


  1. Once the device has stopped venting remove the lid.


  1. Samples are ready to be weighed.


  1. After weighing the samples return them to the desiccator for another 2 hours to ensure that they are completely dry.



  1. Reweigh the samples. If the difference between the two weights is significant (>0.5g) then return the samples to the desiccator for another 60 minutes.


  1. If the samples have again lost a significant amount of weight return the samples to the desiccator for another hour and then reweigh. Repeat until the weight of the sample remains constant.



  1. CALCULATIONS


Nil


  1. REPORTING


Nil


  1. NOTES ON THE METHOD



  1. PRECISION


Nil


  1. DOCUMENTATION


Nil




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