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Matveev Alexey , Ph.D. , senior research scientist Eugenii Shapiro , Ph.D. , chief specialist

Matveev Alexey , Ph.D. , senior research scientist Eugenii Shapiro , Ph.D. , chief specialist NTP « Truboprovod » , Moscow, Russian Federation start@truboprovod.ru http://www.truboprovod.ru. START Prof – THE PIPE FLEXIBILITY AND STRESS ANALYSIS.

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Matveev Alexey , Ph.D. , senior research scientist Eugenii Shapiro , Ph.D. , chief specialist

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  1. Matveev Alexey, Ph.D., senior research scientist Eugenii Shapiro, Ph.D., chief specialist NTP «Truboprovod», Moscow, Russian Federation start@truboprovod.ru http://www.truboprovod.ru

  2. START Prof – THE PIPE FLEXIBILITY AND STRESS ANALYSIS World’s first pipe stress analysis software First introduced in 1969 The Russian code pipe stress analysis de facto standard

  3. START implements Russian codes

  4. START is used by more than 1400 companies, more than 8300 licenses Russia, Ukraine, Belarus, Kazakhstan,Turkmenistan, Uzbekistan, Lithuania, Czech Republic, Serbia, Finland, Germany, United Kingdom Belarus Ukraine Russia Kazakhstan

  5. Some completed design projects from one of our 1400 users: OAO "Mosinjproject", Moscow, Russia. Buried district heating network with polyurethane foam insulation built in Moscow. Depth 1.4 m, soil: sand, diameter 1420 mm, wall thickness 14 mm, Pressure 1.6 MPa, Temperature 130°C, product: hot water.

  6. OAO "Mosinjproject", Moscow, Russia. Above ground district heating network with polyurethane foam insulation built in Moscow. Diameter 1420 mm, wall thickness 14 mm, Pressure 1.6 MPa, Temperature 150°C, product: hot water

  7. OAO "Mosinjproject", Moscow, Russia. Buried district heating network with polyurethane foam insulation at Moscow. Depth 2 m, soil: sand, diameter 820 mm, wall thickness 9 mm, Pressure 1.6 MPa, Temperature 130°C, product: hot water

  8. START buried pipeline modeling The pipe-soil interaction model is based on the experiment results by VNIIST Co., Moscow Interaction between pipeline and soil in buried pipelines, taking into account nonlinear soil flexibility, polyurethane insulation layer and expansion cushions.

  9. Buried pipeline soil interaction model Backfill trench soil • K1 – Polyurethane foam insulation flexibility • K2 – Expansion cushion flexibility • K3 – Horizontal soil flexibility • K4 – Vertical soil flexibility • K5 – Longitudinal soil flexibility Cushion Native soil

  10. Buried pipeline – soil interaction model The pipe-soil interaction model is based on the experimental results at VNIIST, Moscow Vertical soil flexibility Longitudinal soil flexibility Friction Horizontal soil flexibility Horizontal soil P-∆diagram Vertical soil P-∆diagram Longitudinal soil P-∆ diagram (friction)

  11. START automatically calculates the soil spring properties according to the soil type, depth at each point, slope angle of pipe and ground, insulation properties The spring properties is based on horizontal pipe experiment data. START use the special algorithm to recalculate the nonlinear spring properties for pipes for a different slope angle 0 to 90 degree.

  12. START also consider the buoyancy of water and changing of the soil properties located in water (soil liquefaction) Ground water level Ground water level

  13. START also checks the buried pipe crossection for • Bending and membrane stresses in pipe due to external soil pressure and internal product pressure • Ring buckling of pipe cross section • The stresses in polyurethane foam insulation It’s possible due to the internal nonlinear FEM model of buried pipe crosssection with polyurethane. This model consider: • Nonlinear soil springs around the pipe ring • Pressure swell effect (prevents ovality) • Detachment of soil at upper side of pipe(soil should work only for compression)

  14. Buried pipe with polyurethane insulation depth selection problem The maximum depth is limited by the polyurethane foam insulation strength analysis and ring buckling of the pipeThe minimum depth is limited by longitudinal stability (stability increases as the depth increases)

  15. Code strength conditions comparison for buried heating networks For carbon steel: * - Calculates automatically due to design of pipeline. For example ν=0.3 for fully restrained pipe, 0.5 for fully unrestrained and 0.3…0.5 for other intermediate design

  16. Weight + pressure + Temperature case is checked only for straight pipes to avoid the yield of pipe material. For bends, tees and reducers this condition is ignored “Fatigue fracture” check case =

  17. START consider the remaining friction forces at the cold condition of the pipeline. No analog in other software. It is important for pre-stretched buried pipelines Operation condition of above ground pipeline Cold condition of above ground pipeline (after cool down). There’s a big anchor force due to remaining friction Operation condition of buried pipeline Cold condition of buried pipeline (after cool down). There’s a big anchor force due to remaining friction

  18. START consider pressure thrust forces Bourdon effect in bends with initial ellipticity (ovality) Pipe contraction (shortening) due to internal pressure

  19. Since 2014 START perform stress analysis for fiberglass piping with polyurethane foam insulation according to standard STO 91579448-01.1-2013 (copy of ISO 14692) for district heating pipelines. START have the database with fiberglass pipe and fitting material properties at different temperatures. Therefore START provides fiberglass analysis as easy as for the steel pipelines.

  20. Unrestrained buried pipeline modeling Virtual Anchors Axial forces diagram

  21. Buried pipeline model with restrained zone Virtual anchor length(sliding friction zone) Restrained Zone (zero displacement) Axial forces diagram Lateral bearing length Bending moment diagram

  22. START consider nonlinear effects • Friction in sliding supports • Returning force due to hanger rod rotation • One-way restraints • Gaps • Nonlinear soil properties for buried pipes • Spring and constant force hanger selection

  23. Equipment and vessel nozzle flexibility modeling: • START-Nozzle option • Nozzle-FEM program

  24. START offers • Input data error checking and reports. The error checker analyzes the user input and checks for consistency from both engineering and geometrical point of view • Automatic on-the-fly pressure design checking of all pipes and fittings • Regular training by our specialists that can be provided at your site or in one of our training centers • Technical support from START developers • Exports input data and analysis results to Microsoft Word

  25. Pricing Options

  26. Sliding support span calculation (strength condition and limited sagging condition) • Wall thickness calculation of pipes, bends, tees, redusers, caps • Draft L-, Z-, U-shaped loop analysis • One-time compensator span length calculation • Restrained buried straight and curved pipe longitudinal stability analysis • Pipe ring buckling due to external pressure analysis • Pipe ring buckling and stress analysis due to soil weight • Polyurethane insulation stress analysis due to soil and vehicle weight • e.t.c.

  27. Thank you! Matveev Alexey, Ph.D., senior research scientist Eugenii Shapiro, Ph.D., chief specialist NTP «Truboprovod», Moscow, Russian Federation start@truboprovod.ru http://www.truboprovod.ru

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