# Input variables

## Generic variables

These variables can be found in virtually all reports as input variables

- Design Pressure –
`P`_{d} - Pressure assumed to be present in the component according to the design terms
- Design Temperature –
`T`_{d} - Temperature assumed to be present in the component according to the design terms
- Material
- Name of selected material used for the construction of the component

## Specific variables

These variables are component specific

- Outside Diameter –
`D`_{e} - Outside diameter of the attached part. The diameter runs from the outside of the wall to the opposite outside of the wall, through the center of the circle.
- Nominal Thickness –
`d`_{n} - Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
- Corrosion –
`Ca` - Amount of thickness that accounts for the possible effects of corrosions.
- Tolerance –
`tol` - Tolerance in thickness for production
- Strength reduction coefficient –
`z` - Effectiveness of the strength, depending on whether joints are seamless, welded, or expected to perform worse than the base material properties
- Infinite length –
`L′` - The unsupported lenght of the shell is infitely long, meaning the external pressure can not collapse the shell.
- Maximum unsupported length –
`L` - Maximum length of the straight part of the pipe that is unsupported.
- Out of roundness –
`u` - relative out of roundness regarding the shape of the shell.
- Margin –
`γ`

Pipe

# Calculated Values

- Allowable Stress at Temperature –
`f` - Stress in the component at which it is still allowed (without failure) to use the component
- Modulus of elasticity –
`E` - Tendency to deform (tensile strain) along an axis when opposing forces (tensile stress) are applied along that axis.
- Poisson's ratio –
`ν` - (Negative) ratio of transverse to axial strain. An extension (or contraction) in the direction of a load corresponds in a contraction (or extension) in a direction perpendicular to the applied load. The ratio between these two quantities is the Poisson's ratio.
- Unsupported length –
`L` - Actual length of the straight part of the pipe that is unsupported.
- Number of lobs –
`n` - Positive integer ≥ 2, to be determined such that the required thickness becomes maximum.
- Nominal Required Thickness –
`d`_{rn} - Based on the input, this is the calculated thickness that is required to sustain the loads. The nominal value should be smaller than the nominal design thickness.

# Scope errors

- Design temperature material is out of scope.
- The material properties are not available at the design temperature.
- Wall thickness is out of scope: required
`d`≤ 0.2`D`_{e} - This code determines for pipes a maximum thickness.

# Errors

- Can’t find material ‘MaterialName’ in database
- Material could not be found in database. Select an existing material name, or select another material via the material selection window.
- Insufficient wall thickness
- Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.

# Remarks

- Restricted unsupported length:
`L`= x mm - The unsupported length is restricted to a maximum:
`L`≤`L′`

# Calculation errors

- Can't calculate maximum unsupported length for external pressure.
- The shell has insufficient strength to determine the unsupported length.