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Table 5.4 shows that for some bending tests the measured values for the ovalisation after unloading (fAB) were lower than the values according to the DNV Offshore Standard OS-F101 [11] formula at maximum bending (fMBS).Part of these differences were the result of Equation (5.15) being a design formula predicting a “safe” value for ovalisation.Moreover,Equation (5.15) predicts ovalisation at maximum bending strain while measurements were performed after the bending test.During unloading of the pipe,a reduction of the ovalisation occurred [29].Ovalisation at maximum bending strain in the small scale reeling tests was not measured.Ovalisation meters measuring ovality during the test were used in the full scale testing,however.
For some bending tests,the measured ovalisation of the pipe,unloaded after the test,was larger than the Offshore Standard OS-F101 [11] prediction for ovalisation at maximum bending strain.This may be due to the DNV Offshore Standard OS-F101 (2000) being valid for pure bending while ovalisation during reeling is the result of bending,a reaction force of the reel on the pipe and axial tension (Figure 5.3 and Figure 5.10).The reaction force of the reel on the pipe in combination with the tension force increase ovalisation during bending [38].It should be realised that ovalisation of the 22mm outer diameter pipes was minimal and difficult to measure.
Table 5.4 shows that for some bending tests the measured values for the ovalisation after unloading (fAB) were lower than the values according to the DNV Offshore Standard OS-F101 [11] formula at maximum bending (fMBS).Part of these differences were the result of Equation (5.15) being a design formula predicting a “safe” value for ovalisation.Moreover,Equation (5.15) predicts ovalisation at maximum bending strain while measurements were performed after the bending test.During unloading of the pipe,a reduction of the ovalisation occurred [29].Ovalisation at maximum bending strain in the small scale reeling tests was not measured.Ovalisation meters measuring ovality during the test were used in the full scale testing,however.
For some bending tests,the measured ovalisation of the pipe,unloaded after the test,was larger than the Offshore Standard OS-F101 [11] prediction for ovalisation at maximum bending strain.This may be due to the DNV Offshore Standard OS-F101 (2000) being valid for pure bending while ovalisation during reeling is the result of bending,a reaction force of the reel on the pipe and axial tension (Figure 5.3 and Figure 5.10).The reaction force of the reel on the pipe in combination with the tension force increase ovalisation during bending [38].It should be realised that ovalisation of the 22mm outer diameter pipes was minimal and difficult to measure.
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