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)
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 (paragraph 345.4.2)
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.