ONGStorage Command

PlantUnits.ONGStorage(tag, SiteTag=None, DikeTag=None, SubstanceTag=None, FragilityTagNumbers=None, Horizontal_localPosition=0, Vertical_localPosition=0, Surface_Roughness=None, Pressure=0, Temperature=0, SubstanceVolumeRatio=None, Diameter=None, Height=None, GroundTemperature=None, Ks_Soil_Thermal_conductivity=None, Alphas_Soil_thermal_diffusivity=None, boundary_points_Number=20, boundary_points_height_levels=10, pressure_probit_tag=None, radiation_probit_tag=None, RadiationDifferenceDose=1000)

ON Ground Storage tank object is defined by this command. Defined features also should be assigned by their tags to this/these object/s.

Argument	Type	Description
Tag	int	Unique integer value that will be used for referring to the defined elements or objects.
SiteTag	int	Tag of the site.
DikeTag	int	Tag of the dike that surrounded the tank. There is no need to define if the tank is not surrounded by any dike.
SubstanceTag	int	Tag of the tank content substance or material.
FragilityTagNumbers	list of int	List of the tank fragilities tag.
Horizontal_localPosition	float	Horizontal location of the tank respect to the local reference point (0,0).
Vertical_localPosition	float	Vertical location of the tank respect to the local reference point (0,0).
Surface_Roughness	float	Value of the surface roughness. This value will be used for liquid dispersion models.
Pressure	float	Internal pressure value of the tank.
Temperature	float	Internal temperature value of the tank.
SubstanceVolumeRatio	float	Ratio of the tank content to the total volume of the tank.
Diameter	float	Tank diameter.
Height	float	Tank height.
GroundTemperature	float	Temperature of the ground around the tank that will be used for liquids vaporization. If user do not enter any value, it will be considered equal to site temperature.
Ks_Soil_Thermal_conductivity	float	Soil thermal conductivity or Ks that will be used for liquid vaporization calculation. If user do not enter any value, it will be considered equal to 0.9.
Alphas_Soil_thermal_diffusivity	float	Soil thermal diffusivity that will be used for liquid dispersion and If user do not enter any value, it will be considered equal to 4.3×10^(-7).
boundary_points_Number	int	Number of the boundary points that program uses them to calculate the pressure and temperature at these points.
boundary_points_height_levels	int	Number of the levels that boundary points will be repeated in the height of the tank. If boundary points defined equal to 20 and heigh points level defined equal to 10, there will be 200 points on the tank body that temperatures and pressures will be calculated for.
pressure_probit_tag	int	Tag of the defined probit object to be use for vulnerability under pressure loads.
radiation_probit_tag	int	Tag of the defined probit object to be use for vulnerability under temperature loads.
RadiationDifferenceDose	float	A thermal radiation dose if the increase of radiation become more than this value, code will check the vulnerability of the object using the new thermal radiation dose and defined probit function. In any level it may new units suffer damage and create thermal radiation dose for all other not damaged units, but for far units these doses are less and program shouldn’t recheck the thermal vulnerability. So, if the increase of the radiation becomes more than RadiationDifferenceDose the code assume that a high new radiation happened and checks the vulnerability of unit under the new total dose.

Note

The default values are shown in the command structure.

Example:

As said, defining all above parameters while defining the wind rose object is tough and author suggests that define step by step as shown in the following. The below values are according to the example of chapter 7 of Casal book [Ref.1] :

Python Code

import opensrane as opr

opr.PlantUnits.ONGStorage(1,SiteTag=SiteTAg, DikeTag=2, Horizontal_localPosition=10, Vertical_localPosition=15, Pressure=2*10**5, Temperature=273+3, SubstanceTag=1, FragilityTagNumbers=[1,2,4,6], radiation_probit_tag=2, pressure_probit_tag=4, Diameter=10, Height=8, SubstanceVolumeRatio=0.85)

Code Developed by: Bijan Sayyafzadeh