# Input variables

## Generic variables

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

- Design Pressure –
`P`_{c} - Pressure assumed to be present in the component according to the design terms
- Design Temperature –
`T` - 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

- Large/Small
- Large and Small refer to the large pipe end and the smaller (reduced) pipe end respectively
- Outside Diameter –
`D`(Large/Small)_{o} - 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 cylindrical end –
`e`(Large/Small)_{n} - Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
- Nominal Thickness knuckle on adjacent sides –
`e`,_{1n}`e`(Large/Small)_{2n} - Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
- Nominal inside or outside knuckle radius –
`r`(Large/Small)_{n} - Nominal inside radius (at large end) or outside radius (at small end) of the knuckle.
- Corrosion –
`c`_{0} - Amount of thickness that accounts for the possible effects of corrosions.
- Tolerance –
`c`(Large/Small)_{1} - Tolerance in thickness for production
- Joint coefficient –
`z` - Effectiveness of the strength, depending on whether joints are seamless, welded, or expected to perform worse than the base material properties
- Overall length –
`L` - Length of the entire reducer
- Length conical part –
`L`_{c} - Length of the part that reduces gradually in diameter and hence, forms a conical shape
- Angle cone –
`α` - The angle of the conical section, or the slope with which the diameter reduces.

Concentric reducer

Concentric reducer dimensions

Eccentric reducer

Eccentric reducer dimensions

# Calculated Values

- Allowable Stress at Temperature –
`f` - Stress in the component at which it is still allowed (without failure) to use the component.
- Allowable stress at 20 °C –
`f`_{t} - Stress in the component at which it is still allowed (without failure) to use the component at testing condition.
- Nominal Required Thickness cylinder, cone, junction –
`e`,_{cylrn}`e`,_{conrn}`e`(Large/Small)_{jrn} - 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.
- Nominal Required Thickness cylinder, cone and knuckle at junction –
`e`(Large/Small)_{1,2rn} - 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.
- Maximum Allowable Working Pressure –
`MAWP`(Large/Small) - The maximum pressure at which the component can be used in operation. This value should be larger than the design pressure.
- Design margin –
`P`/_{c}`MAWP`(Large/Small) - Ratio of the design pressure to
`MAWP` - Maximum Allowable Test Pressure –
`MATP`(Large/Small) - The maximum pressure at which the component should be tested and survive.

# Scope errors

- Reducer angle is out of scope: maximum angle is 75°
- This code determines a maximum reducer angle.
- Cylinder thickness at large end is out of scope: required is
`e`_{a}`cos(α)`/`D`> 0.001_{c} - This code determines a minimum thickness.
- Knuckle radius at large end is out of scope: required is
`r`< 0.3`D`_{c} - This code determines a maximum radius.

# 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
`e`at large end._{cyl} - Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
- Insufficient wall thickness
`e`at large end._{1,2} - Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
- Insufficient wall thickness
`e`at large end._{con} - Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
- Insufficient wall thickness
`e`at small end._{cyl} - Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
- Insufficient wall thickness
`e`at small end._{1,2} - Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
- Insufficient wall thickness
`e`at small end._{con} - Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
- Insufficient wall thickness ECCENTRIC reducer (see EN 13480 6.4.9).
- Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.

# Calculation errors

- Can't calculate required junction thickness large end. Please check input data.
- An error occured in the calculation for the required thickness.
- Can't calculate required junction thickness small end. Please check input data.
- An error occured in the calculation for the required thickness.
- Error in calculations 6.4 for small end.
- An error occured in the calculations for the small end.