# Input variables

## Generic variables

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

Design Pressure – Pd
Pressure assumed to be present in the component according to the design terms
Design Temperature – Td
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 – De
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.
Extrados is the outer radius of the bend. Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Nominal Thickness neutral line – d2n
The neutral line is along the neutral axis of the bend. Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Intrados is the inner radius of the bend. 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
Radius of the bend from the origin to the neutral axis of the bend. The origin lies in on the intersection of the lines perpendicular to neutral axis, through the points where the bend ends turn straight
Bend

# 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 – ft
Stress in the component at which it is still allowed (without failure) to use the component at 20 °C ambient temperature
Bend correction factor at the outer radius of the bend (bend radius + half the outside diameter)
Neutral line factor – C2 (equals 1)
Bend correction factor, considered unity at the neutral axis
Bend correction factor at the inner radius of the bend (bend radius − half the outside diameter)
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
The maximum pressure at which the component can be used in operation. This value should be larger than the design pressure.
Design margin – Pd / MAWP
Ratio of the design pressure to MAWP
Maximum Allowable Test Pressure – MATP
The maximum pressure at which the component should be tested and survive.

# Scope errors

Design temperature material is out of scope.
The material properties are not available at the design temperature.
Wall thickness neutral line is out of scope: required d ≤ 0.19 De
This code determines for bends a maximum thickness.
Bend radius is out of scope: required r ≥ 0.5 De
This code determines for bends a minimum 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.