Input variables
Generic variables
These variables can be found in virtually all reports as input variables
Design Pressure – Pc
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 (header/branch)
Name of selected material used for the construction of the component
Specific variables
These variables are component specific.
Outside Diameter branch and header – do, Do
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.
Inside Diameter – din
Inside diameter at the top.
Shoulder Diameter – D2
Largest outside diameter.
Diameter hole in header – D3
Internal diameter opening between header and branch. Equal to the inside diameter at the bottom.
Overall height branch – H0
Height from top to bottom.
Height at shoulder to branch – H1
Height from the top to the largest outside diameter
Height at inside beveled area – H2
Height from the bottom to the smallest inside diameter.
Height at welding area header – H3
Available height at bottom for welding
Gap between header and weldolet – Gap
Clearance distance at bottom for welding
Nominal Thickness Header – esn
Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Corrosion – c0, c0s
Amount of thickness that accounts for the possible effects of corrosion.
Tolerance header –c1s
Tolerance in thickness for production
Joint coefficient header – zs
Effectiveness of the strength, depending on whether joints are seamless, welded, or expected to perform worse than the base material properties.
Calculated Values
Allowable Operating Stress – f, fs
Stress in the branch and the header at which it is still allowed (without failure) to use the component.
Allowable stress at 20 °C – ft, fst
Stress in the branch and the header at which it is still allowed (without failure) to use the component at testing condition.
Stress ratio – f/fs, ft/fst
Ratio of the allowable stresses in the branch and the header
Reinforcement limit header direction – ls
Length from the branch outside diameter to the end of the header reinforcement zone.
Reinforcement limit branch direction – lb
Length from the header outside diameter to the end of the branch reinforcement zone.
Material area header – Afs
Cross-sectional area of header material between reinforcement limits.
Material area branch – Afb
Cross-sectional area of branch material between reinforcement limits.
Pressure area header – Aps
Cross-sectional area with pressure in header between reinforcement limits.
Pressure area branch – Apb
Cross-sectional area with pressure in branch between reinforcement limits.
Total pressure area – Ap
Total cross-sectional area with pressure in header and branch between reinforcement limits.
Pressure force – Fp
Total force of the design pressure on the total pressure area.
Maximum allowable pressure force – Fpmax
Maximum allwable force of the design pressure on the total pressure area.
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 – Pc/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
No header pipe dimensions specified.
A header pipe is needed for the calculations.
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 for header
Wall thickness is insufficient to bear the applied loads. Increase the wall thickness of the header.
Insufficient reinforcement area.
Reinforcement area is too small. Increase the reinforcement area or thickness.