Input variables

Generic variables

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

Location Class – Location Class
The physical location of the component marked with a classification.
Facility – Facility
The facility under or near which the component is located.
Test medium – Test medium
The medium used to test the component
Design Pressure – P
Pressure assumed to be present in the component according to the design terms
Design Temperature – Td
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 – Db, Dh
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. Generally the branch is smaller in diameter than the header.
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 – thn
Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Corrosion – Ca, Cah
Amount of thickness that accounts for the possible effects of corrosion.
Tolerance header – tolh
Tolerance in thickness for production.
Joint Efficiency – Eh
Effectiveness of the strength, depending on whether joints are seamless, welded, or expected to perform worse than the base material properties.
Weldolet dimensions
Weldolet dimensions

Calculated Values

Minimum yield strength weldolet and header at 20 °C – S, Sh
Stress in the component at which the component starts to plastically deform at 20 °C ambient temperature.
Design factor – F
Factor for the allowable stress when considering underthickness tolerance and maximum allowable depth of imperfections.
Temperature derating factor – T
Factor for the allowable stress when considering high design temperatures
Test design factor – Ft
Factor for the allowable stress when considering underthickness tolerance and maximum allowable depth of imperfections at 20 °C ambient temperature.
Header reinforcement zone length – d
Length from the branch centerline to the end of the header reinforcement zone.
Active branch height – Hbact
Equivalent height of the branch.
Reinforcement thickness – te
Equivalent reinforcement thickness in weldolet cross-sectional area.
Branch reinforcement zone length – L
Length from the header outside diameter to the end of the branch reinforcement zone.
Required reinforcement area – AR
The required cross-sectional area that reinforcement or excess thickness should provide.
Stress ratio – S/Sh, St/Sht
Ratio of the operating stresses in the branch and the header
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 including weld areas – A3
Cross-sectional area of extra reinforcement excess material.
Total available reinforcement area – A
The total available cross-sectional area from reinforcement and excess 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
Test pressure factor – FPt
Factor for maximum test pressure based on design pressure.
Maximum Allowable Test Pressure – MATP
The maximum pressure at which the component should be tested and survive.
Required Test Pressure – Pt
Required hydrostatic pressure for testing at any point in the piping system (paragraph 841.32)

Scope errors

Temperature is out of scope: minimum temperature = -29 °C
This code determines a minimum temperature.
Temperature is out of scope: maximum temperature = 232.22 °C
This code determines a maximum 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.