Input variables
Generic variables
These variables can be found in virtually all reports as input variables for reducers (concentric/eccentric).
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 cylindrical end
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 cylindrical end – De (Large/Small)
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 – dn (Large/Small)
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 (Large/Small)
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
Overall length – L
Length of the entire reducer
Length conical part – Lk
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.
Calculated Values
Allowable Stress cylindrical end at Temperature – f
Stress in the component at which it is still allowed (without failure) to use the component
Allowable stress cylindrical end 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
Nominal Required Thickness cylindrical end – drn (Large/Small)
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.
Cone angle is out of scope: required α ≤ 70° (paragraph 1).
This code determines a maximum cone angle.
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 thickness cone at large end.
Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
Insufficient thickness cone at small end.
Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.