Demobilisation with hydraulic power pack

1. Thoroughly clean the instrument, removing all surface dirt.

2. Strip off the lower end with the cutter assembly and dismantle (see Fitting the cutter). Clean each part.

3. Remove the top bearing adaptor and clean out all dirt, checking that the pair of bearings are free.

4. For the next part of these instructions refer to Dismantling a pressuremeter - SBP:-

   1. Calibrate the membrane for stiffness and modulus – see Carrying out a membrane correction test - SBP

   2. Derive the membrane compression factor – see Carrying out a membrane compression test - SBP

   3. Remove the Chinese lantern and clean.

   4. Calibrate the Pressure Cells – see Calibrating the pressure cells - SBP

   5. Roll back the membrane and calibrate the arms – see Calibrating an arm - SBP

5. Decide at this point whether any maintenance work is required on the internals of the equipment. Things to be considered are:-

   1. The zero settings of the arm springs and pressure cells.

   2. The performance of any of the transducers – do they need replacing?

   3. The cleanliness of the arms and internals.

   4. The quietness and stability of the electronics in general.

   5. The performance of the pore pressure cells – do the porosint filter discs need replacing? see Replacing a 'Porosint' disc

Such work may be prompted by odd behaviour seen in a test or a clear malfunction.

6. Replace the membrane. It is probably as well to leave the Chinese lantern off the instrument at the moment unless the instrument is almost immediately required on site again.

7. Fit the 'Over ADM' calibration cylinder and check that the machine is still working correctly and that it holds pressure correctly. Leave the cylinder in place as protection whilst in storage.

8. Check the desiccators on the SCU and EIU. Change if they show pink. See Drying out desiccators for observations on the drying out of desiccators.

9. Check the condition of the 12 volt batteries and recharge.

10. Check the state of the gas bottle and replace if necessary.

11. Clean, count and grease all lengths of rod and casing. Remove any that are bent and ensure that they are not blocked with soil.

12. Empty and clean the tool boxes, clean all tools.

13. Empty out and clean the water tank.

14. Clean and grease the Ball Foot Clamp.

15. Generally remove surface dirt from all parts, including hoses.

16. Take steps to repair damaged parts and replace materials that have been used or lost.

Pack all parts in a safe place.

Demobilisation when drilling under rotary rig

1. Thoroughly clean the instrument, removing all surface dirt.

2. Strip off the lower end with the cutter assembly and dismantle (see Fitting the cutter). Clean each part.

3. For the next part of these instructions refer to Dismantling a pressuremeter - SBP:-

   1. Calibrate the membrane for stiffness and modulus – see Carrying out a membrance correction test - SBP

   2. Derive the membrane compression factor – see Carrying out a membrane compression test - SBP

   3. Remove the Chinese lantern and clean.

   4. Calibrate the Pressure Cells – see Calibrating the pressure cells - SBP

   5. Roll back the membrane and calibrate the arms – see Calibrating an arm - SBP

4. Decide at this point whether any maintenance work is required on the internals of the equipment. Things to be considered are:-

   1. The zero settings of the arm springs and pressure cells.

   2. The performance of any of the transducers – do they need replacing?

   3. The cleanliness of the arms and internals.

   4. The quietness and stability of the electronics in general.

   5. The performance of the pore pressure cells – do the porosint filter discs need replacing? see Replacing a 'Porosint' disc

Such work may be prompted by odd behaviour seen in a test or a clear malfunction.

5. Replace the membrane. It is probably as well to leave the Chinese lantern off the instrument at the moment unless the instrument is almost immediately required on site again.

6. Fit the 'Over ADM' calibration cylinder and check that the machine is still working correctly and that it holds pressure correctly. Leave the cylinder in place as protection whilst in storage.

7. Check the desiccators on the SCU and EIU. Change if they show pink. See Drying out desiccators for observations on the drying out of desiccators.

8. Check the condition of the 12 volt batteries and recharge.

9. Check the state of the gas bottle and replace if necessary.

10. Clean, count and grease all lengths of rod and casing. Remove any that are bent and ensure that they are not blocked with soil.

11. Empty and clean the tool boxes, clean all tools.

12. Clean and grease the Ball Foot Clamp.

13. Generally remove surface dirt from all parts, including hoses.

14. Take steps to repair damaged parts and replace materials that have been used or lost.

Pack all parts in a safe place.