1. Introduction

Different types of Inclinometer Casing have different degrees to which they can bend, this is dependent on the type of casing and the diameter and length of the casing.

2. Casing Deflection and What It Means

Please see the below infographic which shows the deflection values of various types of Inclinometer Casing. Let's look at the third one down for an example, we can see that it's orange (meaning it's Easy Connect casing) and it has an outer diameter of 70mm, this is the most common type of casing. We can see that it allows for around 46mm of deflection in a 1m length, any more than this and the Inclinometer will foul against the side of the casing. It's rare that 46mm of deflection is experienced in a metre only, if you were to see the deflection happening over 3m, you would be allowed a deflection of 138mm before running into trouble.

The deflection can be seen when looking at Inclinometer data in In-Site using the Incremental Deflection graph when comparing two reading sets, let's look at the graph below and work out the deflection between the two circled points. We can see that the deflection starts at -0.03mm, goes out to 0.20mm at the maximum and comes back to -0.03mm, this all happens over 2m. therefore we can say that 0.46mm of deflection has occurred over 2m, and thus 0.23mm of deflection has happened over 1m, so we're very much safe from the 46mm maximum deflection over a metre.

If you have any further queries regarding Inclinometer Casing Deflection, please submit a support ticket or call Soil Instruments on +44 01825 765044 for advice.

Checked MO'R v1.0 19/05/15