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.
Nominal Thickness knuckle, dish – dkn, ddn
Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Nominal Inside Knuckle Radius – ri1n
Nominal inside radius of the knuckle (small radius). Custom defined size for torispherical and estimated size for elliptical.
Nominal Inside Dish Radius – ri2n
Nominal inside radius of the dish (large radius). Custom defined size for torispherical and estimated size for elliptical.
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
Calculated Values
Allowable Stress at temperature knuckle, dish – f, f2
Stress in the component at which it is still allowed (without failure) to use the component
Corrected allowable Stress at temperature knuckle – fe
Stress in the component at which it is still allowed (without failure) to use the component
Allowable stress at 20 °C knuckle, dish – ft, f2t
Stress in the component at which it is still allowed (without failure) to use the component at 20 °C ambient temperature
Corrected allowable stress at 20 °C knuckle – fet
Stress in the component at which it is still allowed (without failure) to use the component at 20 °C ambient temperature
Outside height – he
Outside height from tangent line to top of dish.
Nominal Required Thickness knuckle, dish – dkrn, ddrn
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.
Diameter dished zone – D1
Diameter at the inside defining the boundary of the dished zone and the knuckle zone.
Minimum distance isolated openings – l3
Minimum required distance between the edges of multiple openings.
Stability pressure knuckle – Pk
Critical pressure to maintain stability in the knuckle.
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.
Dish thickness is out of scope: required dd ≤ dmax.
This code determines for heads a maximum thickness.
Knuckle thickness is out of scope: required dk ≤ dmax.
This code determines for heads a maximum thickness.
Inside knuckle radius is out of scope: required ri1 ≥ ri1min.
This code determines for heads a minimum radius.
Inside knuckle radius is out of scope: required ri1 ≤ ri1max.
This code determines for heads a maximum radius.
Head height is out of scope: required 0.14 De + 0.72 dd ≤ he ≤ 0.3 De + 0.4 dd
This code determines for heads a minimum and maximum height.
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 dish thickness.
Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
Insufficient knuckle thickness.
Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.