Measurand's SAAV is designed to take on a cyclical shape around the inside of the casing as it is installed. To ensure the SAAV is properly seated in the correct cyclical shape, Measurand recommends lifting and pumping it in the casing prior to applying final compression. Measurand also recommends verifying that the SAAV has taken the appropriate cyclical shape by using the SAAV Installation Verification tool in our SAARecorder application.
Step 1 - Launch SAARecorder and Connect to the SAAV
First you must connect your computer to the SAAV with an appropriate interface. More information on properly connecting your computer and the SAARecorder application to a Measurand ShapeArray is available in the following articles in our Support web site.
- Connecting a ShapeArray to a PC using the SAA232
- Connecting ShapeArrays to a PC using the SAA232-5
- Connecting to a PC using the SAAFPU
- Connecting to a PC using the SAAUSB
NOTE: A pre-recorded raw data sample from SAARecorder (.RSA) or a Campbell Scientific data logger raw data file (.DAT) can be loaded into verification tool for analysis instead of being directly connected to the instrument. This is described in more detail in Step 3 below.
Step 2 - Launch the SAAV Installation Verification Tool
Once your computer and SAARecorder are connected to the SAAV, you need to launch the SAAV Installation Verification tool from the Diagnostics menu in SAARecorder.
Figure 1: The SAAV Installation Verification tool is launched from the Diagnostics menu in SAARecorder
Step 3 - Input the Casing's Inner Diameter
In the SAAV Installation Verification window, if you are directly connected to the SAAV, ensure the Live Data option is selected. Alternatively, if you wish to analyze data saved in a raw data file (.RSA or .DAT), then select the Recorded Data option and click the Browse button to select the raw data file. Once your data source is selected, enter the inner diameter of the casing into which the SAAV is being installed in the Casing Inner Diameter field.
Figure 2: The casing's inner diameter must be entered into the Casing Inner Diameter field
NOTE: The Casing Inner Diameter value will need to be entered in millimetres or inches depending on SAARecorder's units setting. The units setting can be changed by selecting the SAA Setup | Units menu option.
Step 4 - Determine Whether the SAAV Has Achieved the Proper Cyclical Shape
As the SAAV takes on a cyclical shape within the casing, it will compress. The amount of compression in the instrument will determine how close the instrument is to the ideal cyclical shape within the casing. Pumping the SAAV to achieve an appropriate amount of compression will reduce the amount of settlement expected after installation.
The SAAV Installation Verification Tool calculates the compression associated with the ideal cyclical shape of the SAAV within the casing using a theoretical model consisting of perfectly rigid segments and joints and the Pythagorean theorem. Although the SAAV's joints are flexible, this is a good approximation for installation purposes.
Changing the Casing Inner Diameter value will calculate and display the following compression values for the SAAV.
- Calculated Compression: The compression associated with the theoretical ideal cyclical shape within the specified casing inner diameter.
- Actual Compression: The current amount of compression within the SAAV based on the live reading or the raw data file selected.
- Remaining Required: How much more compression is required to achieve the compression associated with the theoretical ideal cyclical shape.
- Calculated Potential Settlement: The amount of settlement expected after installation with the SAAV's existing compression.
The dot graph presents the angle in degrees of each segment in the SAAV relative to the calculated medial axis of the casing. The expected average tilt to achieve the Calculated Compression is displayed as a dotted blue line in the graph.
Figure 3: The dot graph provides a quick visualization of the segment's tilt relative to the medial axis
In the dot graph, green dots to the right of the dotted blue line indicate segments that have achieved a desirable tilt. Red dots to the left of the dotted blue line show segments whose tilts are below the expected average.
The Average Tilt Quality indicator in the bottom right corner of the window displays the average tilt value relative to the medial axis in degrees for all segments and a quality indicator showing a Poor (red light) or Good (green light) rating. This rating is determined by the number of segments that have not reached the expected average tilt and their proximity to the expected average tilt. The SAAV should be pumped until the average tilt rating indicates Good (green light).
Figure 4: The Average Tilt Quality indicator indicating that an acceptable cyclical shape has been achieved