This guide will walk you through installing SAAV in existing standard sized (70 mm or 85 mm outer diameter) inclinometer casing with the provided SAAV casing cap.
NOTE: For installation in non-standard sized casings from 47 mm to 100 mm internal diameter, please refer to the Installing SAAV with the Compression Clamp guide in our support web site.
Measurand's SAAV Casing Cap provides a simple, clean, and efficient way to complete an SAAV installation. The SAAV Casing Cap consists of a weather-resistant enclosure with two interchangeable collars to fit the two most common inclinometer casing sizes.
NOTE: More information about installing SAAV can be found in the SAAV Manual.
Figure 1: SAAV Casing Cap Install Kit: (goggles, dust mask, and documentation not pictured)
The SAAV Casing Cap Installation kit is packaged with the following items:
- (8) 3/4” Long 1/4-20 Self Tapping Cap Screw
- (1) Casing Cap Assembly
- (1) Compression Clamp Assembly
- (2) 0.734” Washer
- (4) 3/8”-24 Nylon-Insert Locknut
- (1) 70 mm Collar(1) #3 Phillips Drive
- (1) 1/2” Long 1/4”-20 Bronze Hex Bolt
- (4) 1 1/4” Long 3/8”- 24 Hex Bolt
- (1) Goggles
- (1) Dust Mask
- (1) Fibreglass Warning
- (1) Extension Coupler
- (1) 7/16” Deep Socket
- (1) Ratchet
The following video provides an overview of the installation process. Each step in the installation process is described in more detail below the video.
Step 1 - Place the Casing Cap on the Inclinometer Casing
Ensure you have the proper sized collar connected to the Casing Cap. Instructions for replacing the collar on the Casing Cap can be found in the "Changing the Collar on the SAAV Install Kit's Weather-Resistant Enclosure" guide. Remove the cover of the Casing Cap by removing the screws in the four corners.
Figure 2: Remove the four screws in the cover of the Casing Cap
Remove the Extension Tube Anchor from inside of the Casing Cap by removing the bolt holding it in place. Place the disassembled Casing Cap onto the inclinometer casing.
Step 2 - Insert SAAV Into the Borehole
Insert the SAAV into the borehole through the Casing Cap. Unreel the SAAV from the reel into the borehole from the top of the reel. Do not detach the springbox assembly from the reel at this point.
Figure 3: Insert the SAAV into the borehole by unreeling it from the top of the reel into the Casing Cap
Step 3 - Attach Extension Tubes to the Springbox Assembly
With the springbox assembly still attached to the SAAV reel, detach the Extension Tubes from the reel and attach an Extension Tube to the Springbox assembly using the supplied 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: Attach the Extension Tube (green) to the Springbox assembly (grey) with the supplied hardware while the Springbox assembly is still attached to the reel
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 4 - 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. Lift the SAAV between 0.5 m and 1 m and then force it down 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 lift the SAAV up and force it down until you notice that the mark made on the Extension Tube is no longer settling down inside the casing.
Figure 6: Pumping an SAAV installed in standard inclinometer 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 7: The SAAV Installation Verification tool in SAARecorder
Step 5 - Measure the Azimuth Offset
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 8: Align square protractor with desired direction (left) and then align clear plastic disk with X-mark to get azimuth offset angle (right)
Step 6 - Securing the Casing Cap to the Inclinometer Casing
Rotate the SAAV Casing Cap so that the Extension Tube Anchor will be directly above the Extension Tube when screwed into place with the Casing Cap assembly. The Extension Tube should be as level as possible when making the connection to the Casing Cap. Before securing the Casing Cap, make sure that the collar screws are not aligned with the grooves in the inclinometer casing. Hand-tighten three of the four self-tapping screws into the collar to hold the casing cap in place temporarily. Drill through the empty hole in the collar where the fourth screw and through the inclinometer casing.
NOTE: Any drill bit between 3/16” (4.80 mm) and 7/32” (5.50 mm) can be used. Measurand recommends 13/64” (5.10 mm).
Figure 9: Securing the casing cap to the casing with the four self-tapping screws into the collar
Screw the fourth self-tapping screw into place through the collar and into the inclinometer casing. Remove each of the remaining self-tapping screws in turn and repeat this process until all four holes have been drilled and all self-tapping screws are in place.
Step 7 - Cut the Extension Tube and Apply Final Compression
Set the Extension Tube Anchor on its short edge inside the Casing Cap. While applying a light amount of force on the Extension Tube (approximately 5 kg), mark a line along the anchor on the tube, as shown in the figure below.
Figure 10: Use the Extension Tube Anchor to mark the Extension Tube
Cut the fibreglass Extension Tube along the marked line. Insert the extension tube anchor into the top of the tube. Compress the Extension Tube until you can screw the bolt into place.
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.
Figure 11: Insert the Extension Tube Anchor into the Extension Tube and compress the tube until the bolt can be screwed into place
Tighten the bolt until the Extension Tube Anchor makes contact with the bottom plate or until the anchor can no longer be moved.
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.
Step 8 - Route Cabling and Secure the Casing Cap
Feed ShapeArray cable through the cable gland in the Casing Cap. Feed approximately 15 cm to 20 cm (6” to 8”) of slack ShapeArray cable through the Casing Cap and into the casing.
Figure 12: Feed some slack cable into the casing and the cable gland
Verify that the gasket is in place in the weather-resistant enclosure cover. Place cover on the top of the Casing Cap and secure it with screws in each of the four corners. Tighten the nut on the cable gland on the outside of the Casing Cap.
Figure 13: Once the nut on the cable gland is tightened, the installation is complete