Input variables
Generic variables
These variables can be found in virtually all reports as input variables.
Design Pressure – P
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
Weld fitting option – W
Is the fitting welded
Specific variables
These variables are component specific
Outside Diameter – D
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 – tn
Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Corrosion – c
Amount of thickness that accounts for the possible effects of corrosions.
Tolerance – tol
Tolerance in thickness for production
Joint Efficiency – E
Effectiveness of the strength, depending on whether joints are seamless, welded, or expected to perform worse than the base material properties
Length tangent to tangent – L
Length of the straight part of the pipe (equals the unsupported length of the pipe)
Calculated Values
Allowable Operating Stress – S
Stress in the component at which it is still allowed (without failure) to use the component
Allowable stress at 20 °C – Sa
Stress in the component at which it is still allowed (without failure) to use the component at 20 °C ambient temperature
Minimum yield strength at 20 °C – Symin
Stress in the component at which the component starts to plastically deform at 20 °C ambient temperature
Allowable stress test – St
Stress in the component at which it is still allowed (without failure) to use the component at testing condition.
Weld joint strength reduction – W
Factor by which the allowable strength is reduced in order to accommodate the reduction in strength in the welded joint.
Nominal Required Thickness – trn
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 – P/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.
Required Test Pressure – Pt
Required hydrostatic pressure for testing at any point in the piping system
Scope errors
Temperature is out of scope for material
The material properties are not available at the design temperature.
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
Requires special considerations according 304.1.2 (b), considering theory of failure, effects of fatigue and thermal stress.
For thick walled shells or when P > 0.385 S E
Calculation errors
Can't calculate required thickness. Please check input data.
An error occured in the calculation for the required thickness.