Read about START-PROF pipe stress analysis software
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...
Property |
Description |
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 |
Weld bending quality factor |
Set based on standards. Can be calculated automatically
by pressing |
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:
SNIP 2.05.06-85 section 8.22,
RD 10-249-98 section 3.3.1.3. table 3.3,
GOST 32569-2013,
GOST 32388-2013 table 1.3).
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.
.