Input variables

Generic variables

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

Design Pressure – P_c: 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 – d_o, D_o: 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 – d_in: 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 – e_sn: Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Corrosion – c₀, c_0s: Amount of thickness that accounts for the possible effects of corrosion.
Tolerance header –c_1s: Tolerance in thickness for production
Joint coefficient header – z_s: 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 – f, f_s: Stress in the branch and the header at which it is still allowed (without failure) to use the component.
Allowable stress at 20 °C – f_t, f_st: 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/f_s, f_t/f_st: Ratio of the allowable stresses in the branch and the header
Reinforcement limit header direction – l_s: Length from the branch outside diameter to the end of the header reinforcement zone.
Reinforcement limit branch direction – l_b: Length from the header outside diameter to the end of the branch reinforcement zone.
Material area header – A_fs: Cross-sectional area of header material between reinforcement limits.
Material area branch – A_fb: Cross-sectional area of branch material between reinforcement limits.
Pressure area header – A_ps: Cross-sectional area with pressure in header between reinforcement limits.
Pressure area branch – A_pb: 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.
Pressure force – F_p: Total force of the design pressure on the total pressure area.
Maximum allowable pressure force – F_pmax: 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 – P_c/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.