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 (tapered) header and (tapered) branch – Dh, Dh, Db, Db
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. Generally the branch is smaller in diameter than the header.
Nominal Thickness (tapered) header and (tapered) branch – thn, th, tbn, tb
Thickness ‘as is’, meaning it is the design thickness taking into account corrosion and tolerance.
Tapered section
Section in which the thickness of either the branch or header gradually changes to the thickness of the pipe.
Corrosion – c
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.
Half width header direction – W0
Distance from the centerline of the branch part to the end of the header part indicated by the direction.
Half height branch direction – H0
Distance from the centerline of the header part to the end of the branch part indicated by the direction.
Crotch outside radius factor – Rf
Tee transition outside radius factor. Default value is 0.67
Crotch thickness factor – CF
Tee crotch thickness factor. Default value is 1.25
Tee transition outside radius header to branch – rx
Tee crotch outside radius. Radius is calculated or user defined.
Nominal Crotch Thickness – tcn
Crotch thickness is calculated or user defined.
Tee dimensions
Tee dimensions

Calculated Values

Minimum yield strength at 20 °C – Symin
Stress in the component at which the component starts to plastically deform at 20 °C ambient temperature.
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 – St
Stress in the component at which it is still allowed (without failure) to use the component at 20 °C ambient temperature
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.
Ratio of outside diameters branch and header – Db/Dh
Ratio of the diameters must be ≤ 1.
Branch inside diameter at header outside diameter – dc
Inside diameter of the branch where the branch meets the outside diameter of the header.
Header reinforcement zone length – d2
Length from the branch centerline to the end of the header reinforcement zone.
Branch reinforcement zone length – L5
Length from the header outside diameter to the end of the branch reinforcement zone.
Reinforcement factor – K
Multiplication factor for the header opening.
Required area – A1
Required cross-sectional area of the reinforcement in order to accommodate the tee.
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
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 345.4.2)
Tapering header and branch
The tapering of the header and branch on connecting pipes is checked.

Scope errors

Temperature is out of scope for material
The material properties are not available at the design temperature.
Db/Dh is out of scope: required Db/Dh ≤ 1 for Dh/Th < 100
This code determines limits for the ratio.
Db/Dh is out of scope: required Db/Dh ≤ 0.5 for Dh/Th ≥ 100
This code determines limits for the ratio.
Crotch outside radius is out of scope: required is rxminrxrxmax.
This code determines limits for the ratio.

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 wall thickness for branch
Wall thickness is insufficient to bear the applied loads. Increase the wall thickness of the branch.
Insufficient reinforcement area or wall thickness.
Reinforcement area is too small. Increase the reinforcement area or thickness.

Warnings

Tapering header in reinforced zone.
Indicates tapering of header in reinforced zone.
Tapering branch in reinforced zone.
Indicates tapering of branch in reinforced zone.