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: 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 – 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.
Nominal Thickness – t_n: Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Corrosion – A: Amount of thickness that accounts for the possible effects of corrosions.
Tolerance – tol: Tolerance in thickness for production.
Joint Efficiency – E: Effectiveness of the strength, depending on whether joints are seamless, welded, or expected to perform worse than the base material properties.

Elliptical Cap

Calculated Values

Allowable Operating Stress – S: Stress in the component at which it is still allowed (without failure) to use the component.
Allowable stress at 20 °C – S_a: Stress in the component at which it is still allowed (without failure) to use the component at 20 °C ambient temperature.
Minimum yield strength at 20 °C – S_ymin: Stress in the component at which the component starts to plastically deform at 20 °C ambient temperature.
Allowable stress test – S_t: Stress in the component at which it is still allowed (without failure) to use the component at testing condition.
Weld joint strength reduction – W: Factor by which the allowable strength is reduced in order to accommodate the reduction in strength in the welded joint.
Inside Diameter – D_i: Outside Diameter − 2 × Thickness
Inside dish height – h_i: Inside Diameter / 4
Spherical radius factor – K: 1/6 (2 + (D_i / (2 h_i))²)
Nominal Required Thickness – t_rn: 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.
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.
Head thickness is out of scope: required is t ≥ 0.002 L: This code determines for heads a minimum thickness.

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 head thickness.: Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.