Read about START-PROF pipe stress analysis software
Pipe wall thickness check for above-ground segments is done for internal pressure.
For buried segments, thickness is checked for external pressure and surrounding soil pressure based on PUR insulation analysis methods, checking stability and safety.
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.
Pipe strength against the surface load is calculated using the method described here.
Property |
Description |
External diameter, Da |
External pipe diameter, D |
Pipe wall thickness, S |
Nominal wall thickness |
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... |
External casing diameter, Dc |
External insulation casing diameter. If insulation is absent, set as 0 |
Casing thickness, SC |
Insulation casing thickness |
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... |
Depth, Z |
Depth (distance from soil surface to pipe axis) |
Insulation weight |
Insulation uniform weight. More... |
Product weight |
Product uniform weight. More... |
Backfill soil number |
Trench soil number, can be selected from the soil database (see appendix 1 below) |
Base soil number |
Base (undisturbed) soil number, can be selected from the soil database. |
Steel grade |
Pipe material from the materials database |
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... |
Insulation type |
Insulation type: armopenobeton, polymer, polyurethane, other |
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:
for above-ground segments, formula (12) is used,
for buried segments, formula (13) is used, while longitudinal stress analysis uses formula (18)
wall thickness analysis using formula (66) section 13.16 is not performed!
Wall thickness is rounded up to 0.1 mm.
Pipe. Above-ground > Wall Thickness Analysis
Pipe. Buried> Wall Thickness Analysis
.