Tee Wall Thickness Calculation

Read about START-PROF pipe stress analysis software

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This analysis determines maximum allowable pressure on tees based on input header wall thickness; and vice versa, minimum wall thickness based on input pressure. In addition, stress intensification factors in and out of the tee plane and maximum allowance bending moment for tee branch are calculated. Allowable bending moment is calculated based on static and fatigue failure requirements.

Input data can be copied using the toolbar icon and inserted into any other Start-Elements analysis by using the toolbar icon in that file.

Tee properties can also be copied between START-PROF and Start-Elements. More...

Input data



External diameter, D

Tee header external diameter

Branch diameter, d

Tee branch external diameter

Branch wall thickness, Ss

Nominal branch wall thickness

Branch height, Hs

Length of the pipe welded to the tee (branch), which reinforces the opening

Mill tolerance

Mill tolerance at the time of production. More...

Corrosion and wear allowance

Corrosion and wear allowance (working mill tolerance) for wall thickness. More...

Weld pressure quality factor

Set based on standards. Can be calculated automatically by pressing . More...

Weld bending quality factor

Set based on standards. Can be calculated automatically by pressing . More...

Ambient temperature

Average wall (metal) temperature at the time when pipe segments become a single joined structure. More...

Operation temperature

Operation temperature in operation state. More...

Operation pressure, P

Operation pressure in operation state. Set for all standards except SNIP 2.05.06-85. More...

Working pressure, Pwork

Working pressure (based on standards). Set when analyzing with SNIP 2.05.06-85. More...

Service life

Piping service life from 1 to 30 years. Used for fatigue failure analysis.

Allowable fatigue safety factor

Used for fatigue failure analysis. Usually set as 1.0, but in cases of higher safety requirements can be set as 0.2, 0.15 or 0.1.

Steel grade

Pipe material from the materials database


If "pressure" is selected, allowable pressure can be calculated by setting nominal wall thickness. If "wall thickness" is selected, minimum allowable wall thickness can be calculated by setting the pressure.

In both cases, wall thickness is set as no lower than the minimum allowable based on:

For SNIP 2.05.06-85, an additional wall thickness check is performed using formula (66) section 13.16.

Wall thickness is rounded up to 0.1 mm.