Calculate the pressure response from test delta volume and delta pressure data (DNVGL-RP-F115 Appendix C).
The initial pressure volume response is affected by air trapped in the pipeline. Select the number of data points so that only the linear section of the curve is used (data points are selected from last data point). The volume of air is calculated from the slope and Z intercept (see figure 4-1). The air fraction should not exceed 0.2%. Use the unrestrained option for risers, spools, and piping. The restrained option should be used for pipelines.
Enter data as comma or tab separated pairs (ΔVi, ΔPi), with each data pair on a new line. Use the data plot option to display the data points, and the best fit line.
Tool Input
- schdtype : Pipe Schedule Type
- diamtype : Pipe Diameter Type
- ODu : User Defined Outside Diameter
- IDu : User Defined Inside Diameter
- wtntype : Wall Thickness Type
- tnu : User Defined Wall Thickness
- numtype : Number Of Data Points To Use (From The End)
- Nu : User Defined Number Of Points
- Vdata : Delta Volume Data Values
- Pdata : Delta Pressure Data Values
- ΔV : Delta Volume
- L : Pipe Length
Tool Output
- ΔP : Delta Pressure
- ID : Inside Diameter
- OD : Outside Diameter
- Va : Volume Of Air
- Va/Vo : Air Fraction
- Vo : Unpressurised Fluid Volume
- tn : Nominal Wall Thickness