Input variables

Generic variables

These variables can be found in virtually all reports as input variables

Design Pressure – P_d: Pressure assumed to be present in the component according to the design terms
Design Temperature – T_d: 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 – D₀, D_e: 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 – D₁: 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 – d_n: Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Corrosion – Ca, Ca_h: Amount of thickness that accounts for the possible effects of corrosion.
Tolerance header– tol_h: Tolerance in thickness for production
Strength reduction coefficient header – z_h: Effectiveness of the strength, depending on whether joints are seamless, welded, or expected to perform worse than the base material properties.

Weldolet dimensions

Calculated Values

Allowable Operating Stress – f₁, f: Stress in the component at which it is still allowed (without failure) to use the component. The additional h indicates the same variable but for the header.
Allowable stress at 20 °C – f_1t, f_t: Stress in the component at which it is still allowed (without failure) to use the component at 20 °C ambient temperature. The additional h indicates the same variable but for the header.
Stress ratio – f₁/f, f_1t/f_t: Ratio of the allowable stresses in the branch and the header
Reinforcement limit header direction – L₀: Length from the branch outside diameter to the end of the header reinforcement zone.
Reinforcement limit branch direction – L₁: Length from the header outside diameter to the end of the branch reinforcement zone.
Material area header – A₀: Cross-sectional area of header material between reinforcement limits.
Material area branch – A₁₂: Cross-sectional area of branch material between reinforcement limits.
Total material area – A: Total cross-sectional material area in header and branch between reinforcement limits.
Pressure area header – A_p0: Cross-sectional area with pressure in header between reinforcement limits.
Pressure area branch – A_p12: Cross-sectional area with pressure in branch between reinforcement limits.
Total pressure area – A_p: Total cross-sectional area with pressure in header and branch between reinforcement limits.
Minimum strength reduction coefficient at opening – z_min: Minimum required effectiveness of the strength in the opening.
Strength reduction coefficient at opening – z₃: Effectiveness of the strength in the opening.
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_d / 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.
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 strength reduction coefficient for header: required is z₃ ≥ z_min (D0201).: Strength reduction coefficient is too small. Increase the reinforcement area or thickness.