## 3 Experimental Testing of Coating by Oil Dispersion
### Results of Experimental Measurements  
Measurement of the coating of a slender pipe made of \"Mirelon 15\" (inner tube diameter is 15 mm) with oil dispersion fraction was performed with a calibrated A & D scale, the parameters of which are given above. In total, four sets of weights were measured by weighing the weight of the tubes, weighing six sectors of 1 m long \"Mirelon 15\" and six sectors of 1 m long \"Mirelon 15\" wet tubes after application of the oil fraction dispersion with identical parameters. The result of the first measurement set is shown in Table 1.  
Figure 17 shows the results of the first set of measurements with data taken from Table 2. The oil filler limit value for guaranteed anti-corrosion protection according to the oil product card is 1.4 g/m\({}^{2}\). It follows that under the given conditions and with a pipe with the geometrical parameters of the \"Mirelon 15\" pipe, the sufficient oil film layer extends approximately to 4.6 m. However, it should be kept in mind that the inner surface of the pipe is not evenly coated with the oil film. The biggest differences will be between the highest and lowest points of the inner cross-section of the coated pipe. It can be said, therefore, that the method under the given conditions is not suitable for anticorrosive protection at the originally required length of 6 m.  
Figure 16: Details of how to apply the dispersion oil fraction to the inner surface of the tubes. (**A**) Photograph from experimental measurement shows the emerging fine oil mist; (**B**) The photograph shows the entry of a dispersion oil fraction into a pipe using a nozzle applicator.  
Figure 18 shows the results from the second set of measurements with data taken from Table 3. The limit value of enough oil film is identical to the first set of measurements, i.e., 1.4 g/m\({}^{2}\). Figure 4 shows that, under the given conditions and with the pipe geometrical parameters of the \"Mirelon 25\" pipe, sufficient oil film layer extends approximately to the required distance of 6 m. Thus, it appears that the greater fluorescence of the pipe is more suitable for the application of an anti-corrosion protection at the given oil dispersion application parameters.  
However, it should be remarked that these are only average values with unequal distribution of the thickness of the applied oil layer on the inner surface of the pipe. It is probable that at the top of the cross section, the anti-corrosion protection layer will still be inadequate.  
Figure 19 shows the results of the third set of measurements with data taken from Table 3. The limit value of the oil film sufficient for anticorrosive protection according to the oil product card is 1.4 g/m\({}^{2}\). It follows that under the given conditions and with a tube with the geometrical parameters of the \"Mirelon 35\", a sufficient oil film layer extends to approximately 4 m. As in the previous cases, the inner surface of the pipe is not evenly coated with the oil film. The biggest differences will be between the highest and lowest points of the inner cross-section of the coated pipe. It can be said, therefore, that the method under the given conditions is not suitable for anticorrosive protection at the originally required length of 6 m.  
Figure 17: Graphical representation of average oil film weights in individual sections of the Mirelon 15 coated pipe. Data is downloaded from Table 1. The graph contains a trend line with an estimated power function and a corresponding confidence equation R.