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Introduction
In the Danish DanDas standards, we have a calculated scoring value for the pipe called the Fysisk Indeks (Physical Index).
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The calculations are the same for both standards.
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The Lookup Table
These are the lookup values for the scores that are used to calculate the Fysisk Indeks. The values are the same for DanDas 2.5 and 2.6 Except for the two values at the bottom that are highlighted in red. These values are only used in DanDas 2.5 and are not used in DanDas 2.6.
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The class 4 S2 (finish) code at the end is disregarded because it is at the end of the inspection and has no length, so this should not be considered in the calculations, similar for S3 (abandon) because the inspection cannot carry after this point.
The result of this is that the VA (water level) is defined in the inspection from the beginning to the end.
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The Calculations
The calculations of S and F look like this:
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S = Structural Rate
L = Section Length
Ln = Length of the Observation - assume 1m if the observation is not continuous and S1 , S2 and VA codes are always continuous.
pn = Look Up value from the table above for the code group and class.
F = Fysisk Indeks = Service Rate or Physical Index.
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Codes IN4, OB4, OS4 and RB4 automatically give the inspection a F of 10, regardless of how many times they appear in the inspection.
If a continuous observation is recorded by the user as 1m long or less, then we do not use the L term in the equation, we assume that the observation is not continuous. Continuous observations must be more than 1m long, or else they are not continuous.
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