Read about START-PROF pipe stress analysis software
This analysis calculates maximum allowable pressure for tees based on header wall thickness, or determines minimum required thickness for specified pressure conditions.
The analysis also computes stress intensification factors (in-plane and out-of-plane) and maximum allowable branch bending moments based on static and fatigue failure criteria.
Input data can be copied using the 
toolbar icon and transferred to other START-Elements analyses using the
toolbar icon.
Tee properties can be exchanged 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 reinforcing pipe welded to tee branch |
Mill tolerance |
Manufacturing tolerance at production. More... |
Corrosion and wear allowance |
Wall thickness allowance for corrosion and wear. More... |
Weld pressure quality factor |
Set
according to applicable standards.
Calculate automatically using |
Weld bending quality factor |
Set
according to applicable standards.
Calculate automatically using |
Ambient temperature |
Average wall temperature during pipe assembly. More... |
Operation temperature |
Operating temperature in operating state. More... |
Operation pressure, P |
Operating pressure in operating state. Required for all standards except SNIP 2.05.06-85. More... |
Working pressure, Pwork |
Working pressure (standards-based). Required for SNIP 2.05.06-85 analysis. 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. Typically 1.0; for higher safety requirements use 0.2, 0.15, or 0.1. |
Steel grade |
Pipe material from the materials database |
Select "pressure" mode to calculate allowable pressure for specified wall thickness, or "wall thickness" mode to determine minimum thickness for given pressure.
Wall thickness calculations adhere to minimum requirements per:
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, additional wall thickness verification uses formula (66) section 13.16.
Wall thickness values round up to 0.1 mm.
.