PASS/START-PROF® –  world commercial piping stress analysis software.

PASS/START-PROF® – piping stress analysis software.


The following codes are implemented into Start-Prof software:

 Power Piping
  • ASME B31.1-2018 Power piping (USA) 
  • DLT 5366-2014 Steam/Water Piping in Power Plant (China) 
  • RD 10-249-98 Steam and hot water piping (Russia) 
 Central Heating
  • CJJ/T 81-2013 Buried hot-water heating pipelines (China) 
  • GOST R 55596-2013 District Heating Networks (Russia) 
  • RD 10-400-01 District Heating Networks (Russia) 
  • EN 13941-2019 District heating pipes (European Union) 
 Process Piping
  • ASME B31.3-2018 + Ch. IX Process Piping (USA) 
  • EN 13480-2017 Metallic Industrial Piping (European Union) 
  • GB/T 20801-2006 Process Piping (China) 
  • GB 50316-2008 Metallic Industrial Piping (China) 
  • GOST 32388-2013 Process Piping (Russia) 
  • RTM 38.001-94 Process Piping (Russia) 
 Gas & Oil
  • ASME B31.4-2019 + Ch. IX & XI Liquid Transportation (USA) 
  • ASME B31.8-2018 + Ch. VIII Gas Transmission (USA) 
  • ASME B31.12-2019 Hydrogen Piping and Pipelines (USA) 
  • BS PD 8010-1,2:2015 Pipeline systems (UK) 
  • CSA Z662 + Ch.11 Oil and gas pipeline systems (Canada) 
  • GB 50251-2015 Gas Pipelines (China) 
  • GB 50253-2014 Oil Pipelines (China) 
  • SNiP 2.05.06-85 Gas and Oil Pipelines (Russia) 
  • SP 36.13330.2012 Gas and Oil Pipelines (Russia) 
  • GOST R 55989-2014 Gas and Oil Transmission Pipelines for Pressure Greater 10 MPa (Russia) 
  • GOST R 55990-2014 Field pipelines (Russia) 
  • SP 284.1325800.2016 Field pipelines (Russia) 
 Fiberglass Piping
  • ISO 14692-3:2002/Cor 1:2005 (International) 
  • ISO 14692-2017 (International) 
 Plastic Piping (PE, PE-RT, PP, PB, PVC, PVDF etc.)
  • GOST 32388-2013 (Russia)
 Other Piping
  • ASME B31.5-2019 Refrigeration piping and heat transfer (USA) 
  • ASME B31.9-2017 Building Services Piping (USA) 
  • SP 33.13330.2012 Steel Pipelines (Russia) 
 SIF and flexibility factors
  • ASME B31J-2017 Stress Intensification and Flexibility Factors 
 Equipment Loads Check
  • API 610 11th Edition, Centrifugal Pumps (USA) 
  • WRC 537 Local stresses in spherical and cylindrical shells due to external loadings 
  • API 617 8th Edition. Axial and Centrifugal Compressors and Expander-compressors 
  • API 560 5th Edition. Fired Heaters for General Refinery Service 
  • API 661 7th Edition. Petroleum, Petrochemical, and Natural Gas Industries—Air-cooled Heat Exchangers 
  • API 650 12th Edition. Welded Tanks for Oil Storage 
  • EN ISO 9905:1998+A1:2011 Technical specifications for centrifugal pumps — Class I 
  • EN ISO 5199:2002 Technical specifications for centrifugal pumps — Class II 
  • NEMA SM23 R2002 Steam Turbines for Mechanical Drive Service 
  • GOST 32601-2013, Centrifugal Pumps (Russia) 
 Nozzle Flexibility
  • WRC 297 Local Stresses in Cylindrical Shells Due to External Loadings on Nozzles 
  • PD 5500:2018 Specification for Unfired Fusion Welded Pressure Vessels 
 Seismic Loads
  • GB 50011-2010 (China) 
  • SNiP II-7-81* (Russia) 
  • SP 14.13330.2018 (Russia) 

NP-031-01 (Russia)

 Wind Loads

  • UBC 1997 
  • IBC 2012 
  • ASCE 7-16 (USA) 
  • BS 6399-2 (Britain) 
  • EN 1991-1-4 2005+A1-2010 (European Union) 
  • NBC 2010 (Canada) 
  • GB 50009-2012 (China) 
  • IS.875.3.1987 (India) 
  • AZ/NZS 1170.2:2011 (New Zeland) 
  • NBR 06123-1988 (Brazil) 
  • CNS (Taiwan) 
  • NSR-10 (Colombia) 
  • KBC 2016 (Korea) 
  • CFE 2008 (Mexico) 
  • SP 20.13330.2016 (Russia) 
  • Wind Pressure vs Elevation
  • Wind Velocity vs Elevation

  Snow Loads

  • ASCE 7-16 (USA) 
  • EN 1991-1-3-2003+A1-2015 (European Union) 
  • NBC 2010 (Canada) 
  • GB 50009-2012 (China) 
  • KBC 2016 (Korea) 
  • SP 20.13330.2016 (Russia) 

 Ice Loads

  • ASCE 7-16 (USA) 
  • GB 50135-2006 (China) 
  • SP 20.13330.2016 (Russia) 
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START-Elements - Express Analysis and Sizing

Along with the analysis of piping systems of any complexity, PASS/START-PROF performs a wide spectrum of calculations “on the fly” thereby helping piping designers to make the right decisions. PASS/START-PROF calculates pipe and fitting wall thicknesses, span lengths, as well as sizes of typical piping assemblies. It also checks flange leakage, pump and equipment loads, buried and above ground pipeline longitudinal stability, pipe wall stability under vacuum, and other loads.

Besides the analysis of arbitrary configuration pipelines, we have implemented a working tool along with a piping handbook for piping designer — a START-Elements option. PASS/START-PROF software is designed for rapid flexibility estimation of piping fittings, their strength and stability analysis.

START-Elements allows the user to do the following:

  • Analyze stress of L, Z and U-shaped piping loops (buried and above-ground)
  • Pipe and fitting wall thickness calculation or maximum pressure allowed according to the code selected
  • Calculate maximum allowable distances between supports via strength and stiffness analysis
  • Check general and local stability of straight and curved pipe elements under the thermal expansion, external pressure (vacuum) and soil pressure loads
  • Calculate minimum pipeline laying depth for underground pipeline stability analysis
  • Calculate maximum pipeline laying depth for buried pipeline by polyurethane insulation stress analysis
  • Calculate allowable load on saddle support for large-diameter pipes
  • Calculate allowable distances between single action (one time) compensators and their closing temperature
  • Calculate bellows stiffness if the manufacturer’s data are absent
  • Flange leak check
  • Centrifugal pump load check per API 610 (ISO 13709), GOST 32601-2013 and Kellogg method (L.C. Peng Pipe stress engineering)
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PASS/START-PROF Overview Webinar
PASS/START-PROF Capabilities for District Heating Stress Analysis
PASS START-PROF Capabilities for Pipe Stress Analysis of Power and Process Piping Systems
PASS/START-PROF Capabilities for Oil & Gas Gathering, Upstream and Midstream Pipelines
Buried Piping/Pipelines Stress Analysis with PASS/Start-Prof Tutorial


PASS/START-PROF provides comprehensive pipe stress, flexibility, stability, and fatigue strength analysis with related sizing calculations according to international and national codes and standards. First introduced in 1965, PASS/START-PROF combines a highly efficient solver, powerful analysis features, a user friendly GUI, an intuitive 3D graphical pre/post-processor, and a detailed help system with embedded intelligence from generations of piping design experts.

Due to modern object-oriented and intuitive user interface in PASS/START-PROF engineers can start working immediately, no need to spend a time for "how to push the buttons" training. Companies can put PASS/START-PROF into application immediately after purchase, significantly reducing costs in time saved without compromising on the quality of end results. Engineers can deliver a good quality pipe stress analysis using PASS/START-PROF with minimal training and guidance.

PASS/START-PROF® –  world commercial piping stress analysis software.

PASS/START-PROF is so smart that you need just draw the piping like in 3D modeling software and push the button "run analysis". PASS/START-PROF user should think about piping design, not about node numbering, model creation, etc. PASS/START-PROF will tell you if your model has any problems and show where exactly. All checks are made automatically: stresses, support loads, expansion joint deformations, flange leakage, buckling, loads on springs in all operating modes, stresses in insulation, and stresses in flaws. Table cells with a problem are marked with a red color. All results can be presented in any coordinate system: global, local. PASS/START-PROF offers detailed pipe stress report with all equations that was used; you can check all equations manually.

Enabling new users to perform piping systems analysis of any size or complexity in days rather than months.

Process and piping engineers of more than 3,000 companies in many countries already use the software every day for stress analysis and design of different types of pipelines.

PASS/START-PROF has a smart, intuitive and friendly user interface and user's manual in English, Chinese, and Russian languages.

In PASS/START-PROF everything is simple and straightforward, since you are working with modern object model. You can compose your piping using objects like pipe, bend, tee, reducer, cap, expansion joint, restraint, valve, flange, and other like in 3D modeling software. You don't have to bother with node numbering at all; you can modify your model at any moment using copying, rotating, mirroring, node renumbering, cut, copy, paste any part of the model, add nodes, delete nodes.

To use ASME B31J in PASS/START-PROF you can just turn on the option "ASME B31J". To model buried pipelines just select that pipe is buried. No need to convert whole model using other software.

Additional PASS/START-PROF Resources

Reduces Analysis Time, Effort, and Cost

PASS/START-PROF can import piping models ready for analysis from CADWorx, SmartPlant 3D, AVEVA PDMS, AVEVA E3D, Autodesk REVIT, Bentley Autopipe, HEXAGON CAESAR II, OpenPlant, Autoplant, Smart 3D, etc. You can modify your model without any problem after import.

PASS/START-PROF is an ideal component for integration into any piping design workflow with interfaces to multiple design and analysis software tools.

PASS/START-PROF offers quick 1st hand support from developers and from experienced piping engineers in UK, China, Mexico, Brazil, Australia, Egypt, Turkey and other countries. Support response speed and quality is guaranteed and can be offered on regional language. User feedback is accepted and used to improve development of PASS/START-PROF.

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Broad Applicability

Pipelines that can be analyzed include piping for: process and power, gas and oil transportation, district heating piping, hot water supply, and more. Stress, flexibility, stability, and fatigue strength analysis are performed for buried, above ground, vacuum, high pressure, high temperature, and cryogenic piping. Pipelines with various types of restraints, fittings, and expansion joints can be easily evaluated. PASS/STARTPROF also offers automatic selection of constant and variable spring supports.

PASS/START-PROF can analyze a wide range of materials used in pipelines including: steel, nonferrous materials, plastic pipes and fittings, orthotropic materials such as fiberglass, reinforced plastic, glass reinforced plastics, and glass reinforced epoxy.

The following piping types are covered:

User Interface

PASS/START-PROF has a smart, easy and friendly user interface with user manuals in English, Chinese, and Russian languages. Fast piping modeling allows even the beginner without any special training to be able to perform pipe stress analysis.

An intuitive object-oriented piping model is used for easy modeling of piping systems that consists of following objects:

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Start-Prof Chinese User Interface

System Requirements
Windows 7/8/10+
x86-64 architecture processor
1GB of RAM
Video card with OpenGL 2.0+ support and 1GB+ of RAM 
Display resolution at least 1024x768, recommended 1280x1024
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Start-Prof Chinese User Interface
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