Input variables

Generic variables

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

Gas infrastructure

Location of the facility near which the gas infrastructure is situated.

Maximum Design Factor – f_o

Factor for restricting the allowable stress. The value can be chosen smaller, but not larger.

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

Name of selected material used for the construction of the component

These variables are component specific

Large/Small: Large and Small refer to the large pipe end and the smaller (reduced) pipe end respectively
Outside Diameter – D_o (Large/Small): 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 cylindrical end – e_n (Large/Small): Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Nominal Thickness knuckle on adjacent sides – e_1n, e_2n (Large/Small): Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Nominal inside or outside knuckle radius – r_n (Large/Small): Nominal inside radius (at large end) or outside radius (at small end) of the knuckle.
Corrosion – c₀: Amount of thickness that accounts for the possible effects of corrosions.
Tolerance – c₁ (Large/Small): Tolerance in thickness for production
Joint coefficient – z: Effectiveness of the strength, depending on whether joints are seamless, welded, or expected to perform worse than the base material properties
Overall length – L: Length of the entire reducer
Length conical part – L_c: Length of the part that reduces gradually in diameter and hence, forms a conical shape
Angle cone – α: The angle of the conical section, or the slope with which the diameter reduces.

Concentric reducer

Concentric reducer dimensions

Eccentric reducer

Eccentric reducer dimensions

Allowable Stress at Temperature – f: Stress in the component at which it is still allowed (without failure) to use the component.
Allowable stress at 20 °C – f_t: Stress in the component at which it is still allowed (without failure) to use the component at 20 °C ambient temperature
Nominal Required Thickness cylinder, cone, junction – e_cylrn, e_conrn, e_jrn (Large/Small): 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.
Nominal Required Thickness cylinder, cone and knuckle at junction – e_1,2rn (Large/Small): 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_c/MAWP (Large/Small): Ratio of the design pressure to MAWP
Maximum Allowable Test Pressure – MATP: The maximum pressure at which the component should be tested and survive.

Design pressure is out of scope: minimum operating pressure > 16 bar.: This code determines a minimum pressure.
Design temperature is out of scope: required -40 °C ≤ T ≤ 120 °C.: This code determines a minimum and maximum temperature.
Design factor is too large: required is fo ≤ fo_max (see 7.2).: This code determines a maximum design factor.
Wall thickness at large end is out of scope according paragraph 7.9.2 Table 1.: This code determines for reducers a minimum thickness.
Wall thickness at small end is out of scope according paragraph 7.9.2 Table 1.: This code determines for reducers a minimum thickness.
Reducer angle is out of scope: maximum angle is 75°: This code determines a maximum reducer angle.
Cylinder thickness at large end is out of scope: required is e_a cos(α) / D_c > 0.001: This code determines a minimum thickness.
Knuckle radius at large end is out of scope: required is r < 0.3 D_c: This code determines a maximum radius.

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 e_cyl at large end.: Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
Insufficient wall thickness e_1,2 at large end.: Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
Insufficient wall thickness e_con at large end.: Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
Insufficient wall thickness e_cyl at small end.: Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
Insufficient wall thickness e_1,2 at small end.: Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
Insufficient wall thickness e_con at small end.: Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.
Insufficient wall thickness ECCENTRIC reducer (see EN 13480 6.4.9).: Wall thickness is insufficient to bear the applied loads. Increase the wall thickness.

Can't calculate required junction thickness large end. Please check input data.: An error occured in the calculation for the required thickness.
Can't calculate required junction thickness small end. Please check input data.: An error occured in the calculation for the required thickness.
Error in calculations 6.4 for small end.: An error occured in the calculations for the small end.