Measurand’s SAAV can be installed in casings with internal diameters (IDs) from 47 mm to 100 mm. For non-standard sized casings, the SAAV compression clamp must be used to finish the installation. To install SAAV with the compression clamp, the following steps should be followed.
NOTE: For installations in standard sized casings with outer diameters (ODs) 70 mm or 85 mm, the SAAV Casing Cap should be used to finish the installation. Detailed instructions for installing SAAV with the Casing Cap can be found in Installing SAAV Into Existing Inclinometer Casing.
The SAAV compression clamp kit includes the following items.
- #3 Phillips Drive bit
- Compression Clamp Assembly plus Anchor
- 1/2" Long 1/4-20 Cap Screw
- 2 x 0.734” Washer
- 4 x 1 and 1/4” Long 3/8”-24 Hex Bolt
- 4 x 3/8”-24 Nylon-Insert Locknut
- 1/4" Drive Ratchet
- 7/16" Deep Socket
Figure 1: Compression Clamp Kit
Step 1 - Insert SAAV into the Borehole
Place the SAAV reel approximately 1 m to 1.5 m (3' to 5') from the borehole. Insert the SAAV into the casing in the borehole. Unreel the SAAV from the reel into the borehole from the top of the reel. Ensure that segments from the reel enter the casing vertically and avoid touching the sides at the top of the casing. Do not detach the springbox assembly from the reel at this point.
Figure 2: Pace the reel 1 m to 1.5 m (3' to 5') from the borehole and unreel the SAAV from the top of the reel into the borehole
NOTE: For casings with a small ID, such as 47 mm ID casing, the SAAV must be inserted such that the Springbox attachment and the Extension Tube that will be connected to it are square to the casing’s circumference, avoiding any inclinometer grooves in the casing.
Figure 3: For casings with small IDs, ensure the springbox and fiberglass extension tube are square to the casing's circumference
Step 2 – Attach Extension Tubes to the Springbox Assembly
With the springbox assembly still attached to the SAAV reel, detach the Extension Tube from the reel and attach it to the Springbox assembly using the included hardware, as shown in the figure below.
WARNING: Ensure that the Extension Tube is attached to the Springbox assembly such that the X-mark on the tubing aligns with the X-mark on the Springbox.
Figure 4: Use the supplied hardware to attach the Extension Tube (green) to the Springbox assembly (grey)
If more than one Extension Tube is required, use the included couplers and hardware to attach them, as shown in the figure below.
Figure 5: Attaching additional extensions - (A) Extension Tubes (grey), (B) Coupler (green), (C) hardware for connecting tubes, and (D) Assembled Extension Tubes
Once your extension tubes have been attached, the springbox assembly can be detached from the SAAV reel and insertion into the borehole can be completed.
Step 3 - Settle the SAAV into the Inclinometer Casing
Once the Extension Tubes are attached and the SAAV is resting on the bottom of the borehole, mark the position of the SAAV inside the casing on the Extension Tubes. Raise the SAAV between 0.5 m and 1 m, then lower it into the casing again using a pumping action similar to churning butter. This will cause the SAAV to settle further into the casing. Continue to pump the SAAV up and down until you notice that the mark made on the Extension Tube is no longer settling down inside the casing. Use the SAAV Installation Verification tool from the Diagnostics menu in SAARecorder to confirm that the SAAV is properly settled. More information on using this tool is available in the Verifying your SAAV Installation guide.
Figure 6: The SAAV Installation Verification tool in SAARecorder
Step 4 - Measure Azimuth Offset with the X-Mark Protractor
Place the square protractor around the Extension Tube at the top of the ShapeArray. Rotate the square protractor until the arrows are pointed to one of the following:
- The expected direction of movement
- Other job site datum
Place the clear disk marker with the X-Line around the Extension Tube and on top of the square protractor so that the X-Line is aligned with X-Mark on the Extension Tube. The X-line, the X-Mark on the Springbox Assembly, and the X-mark on the Extension Tube should now all be aligned. Make note of the angle at the X-Line. This will be used in Measurand software when specifying the azimuth offset angle of the ShapeArray.
Figure 7: Align square protractor with desired direction (left) and then align clear plastic disk with X-mark to get azimuth offset (right)
Step 5 - Disassemble the Compression Clamp Assembly
Remove the bolt holding the Compression Clamp and the Extension Tube Anchor together.
Figure 8: Compression Clamp Assembly before (left) and after disassembly (right)
Step 6 – Mark and Drill Holes in Casing
Place the Compression Clamp on top of the casing with the metal side on the outside of the casing.
NOTE: Ensure the Compression Clamp is oriented along the outside circumference of the casing. You must avoid any inclinometer grooves in the casing. Place the Compression Clamp such that it is centered between any inclinometer grooves.
Figure 9: Mark the casing by placing the compression clamp over it and marking through the hole
Mark the casing through the hole in the Compression Clamp with a thin marker or a screw. Remove the Compression Clamp and drill a hole in the casing where it was marked with a 6.5 mm (1/4") drill bit.
WARNING: Be very careful not to drop the Compression Clamp into the casing!
Step 7 – Attach the Compression Clamp to the Casing
Place the Compression Clamp onto the casing with the metal side on the inside of the casing. Using the included cap screw, secure the Compression Clamp into place. Depending on the thickness of the casing, the screw may be too long. In this case, the washers included in the kit should be used to ensure the screw does not protrude beyond the Compression Clamp body.
Figure 10: Attach compression clamp to the casing with supplied hardware
Step 8 - Cut the Fiberglass Extension Tube and Apply Final Compression
Set the Extension Tube Anchor on its short edge on top of the Compression Clamp. While applying a light amount of force on the Extension Tube (approximately 5 kg), mark a line along the anchor on the tube.
WARNING: Be very careful not to drop the Extension Tube Anchor into the casing!
Figure 11: Mark the Extension Tube by laying the anchor on the Compression Clamp along its short side
Cut the fibreglass Extension Tube along the marked line. Insert the Extension Tube Anchor into the top of the Extension Tube.
NOTE: When cutting fibreglass, be sure to use the proper personal protective equipment (PPE), including goggles and dust mask. Please refer to the SAAV Manual for a full description of PPE.
Compress the Extension Tube until you can screw the Extension Tube Anchor to the Compression Clamp with the bolt.
WARNING: Do not use power tools to secure the bolt. This can damage the threads and/or the plate. Use the supplied ratchet and deep socket to secure the Extension Tube Anchor to the Compression Clamp.
Figure 12: Apply final compression by screwing the extension tube anchor into the compression clamp
NOTE: For casing with a small ID, such as 47 mm ID casing, the Extension Tube Anchor will need to be modified. The washer will need to be removed, leaving only the bolt, spacer, and lock nut, before inserting it into the Extension Tube and applying final compression.
Figure 13: For casings with smaller IDs, the Extension Tube Anchor's washer (A) will need to be removed