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 (header/branch): 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 branch and header – D_ob, D_oh: Outside diameter of the 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 – t_hn: Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Corrosion – A, A_h: Amount of thickness that accounts for the possible effects of corrosion.
Tolerance header – tol_h: Tolerance in thickness for production.
Joint Efficiency header – E_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

Minimum yield strength weldolet and header at 20 °C – S_ymin, S_yminh: Stress in the component at which the component starts to plastically deform at 20 °C ambient temperature.
Allowable Operating Stress weldolet and header – S, S_h: Stress in the branch and the header at which it is still allowed (without failure) to use the component.
Allowable stress weldolet and header at 20 °C – S_t, S_ht: Stress in the branch and the header at which it is still allowed (without failure) to use the component at 20 °C ambient temperature.
Weld joint strength reduction header – W_h: Factor by which the allowable strength is reduced in order to accommodate the reduction in strength in the welded joint.
Stress ratio – S/S_h, S_t/S_ht: Ratio of the allowable stresses in the branch and the header.
Header reinforcement zone length – d₂: Length from the branch centerline to the end of the header reinforcement zone.
Reinforcement thickness – t_e: Equivalent reinforcement thickness in weldolet cross-sectional area.
Branch reinforcement zone length – L₄: Length from the header outside diameter to the end of the branch reinforcement zone.
Required Area – A₇: Required cross-sectional area of the reinforcement in order to accommodate the weldolet.
Reinforcement area header – A₁: Cross-sectional area of excess thickness header.
Reinforcement area branch – A₂: Cross-sectional area of excess thickness branch.
Reinforcement area of extra added area – A₄: Cross-sectional area of extra reinforcement excess material.
Reinforcement area of extra weld areas – A₅: Cross-sectional area of weld material.
Total available reinforcement area – A_r: The total available cross-sectional area from reinforcement and excess thickness. Sum of areas is corrected for stress ratio.
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 – P_t: Required hydrostatic pressure for testing at any point in the piping system (paragraph 137.4.5)

Scope errors

Pressure for steam/vapor is out of scope: minimum pressure = 0.1 MPa: This code determines for steam/vapor a minimum pressure.
Pressure for water is out of scope: minimum pressure = 1.103 MPa: This code determines for water a minimum pressure.
Temperature for water is out of scope: minimum temperature = 100 °C: This code determines for water a minimum 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 reinforcement area.: Reinforcement area is too small. Increase the reinforcement area or thickness.

Calculation errors

No header pipe dimensions specified.: A header pipe is needed for the calculations.