Smart Simulation & Sizing Tools for Every Piping and Equipment Engineer/Designer



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® – Renowned, one of the first 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.

PASS/START-PROF is successfully used in many industries:

  • Power and District Heating
  • Oil and Gas
  • Process
  • Chemistry
  • Metallurgy
  • Other Industries

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.

Features and Advantages

PASS/START-PROF is the latest version the world-renowned Start-Prof software dating back to 1965.
PASS/START-PROF will save you time because modeling and analysis can be done very quickly and is priced considerably lower than most other piping analysis software. Fast modeling is achieved through an easy user interface and fast analysis is achieved through a fast-structural mechanics core using mixed force-displacement method, not just ordinary FEM. PASS/START-PROF can be used by every piping designer with a minimum knowledge about pipe stress analysis and very little training.
PASS/START-PROF is very easy to use and understand. Most new users can become effective with the software very fast (usually only 3 days of training is needed to get started).
An online help system is provided along with context-sensitive help that is embedded into PASS/START-PROF. In any dialog box the user can push F1 and see help for each option.

The Smart Operation Mode Editor allows users to just draw the piping, add general snow, wind, ice, as well as seismic load information and run the analysis. All appropriate load values and load cases will be created automatically according to selected codes. Time consuming manual creation of load cases is no longer needed. Smart Operation Mode Editor allow you to analyze several operation modes of piping in one project file. For each operation mode the special template load cases automatically generated.

The Smart Warning Message Window warns about e.g., pipe lifting off, overloading of supports and springs, or excess of deformations of expansion joints. Important problems in the model will not be missed.

See Knowledge Base

Analysis results are presented in smart reports including:

  • Code Stress Report
  • Support Loads Report
  • Displacements Report
  • Variable Springs Selection Report
  • Constant Springs Selection Report
  • Expansion Joints Report
  • Flanges Leakage Report
  • Pipes and Fittings Wall Stability Report
  • Internal Forces Report

All reports are interactive to make understanding of the analysis results quicker and easier. You can select operating mode, coordinate system, add filters, or sort data on-the-fly.

See Knowledge Base

Several disconnected and independent piping segments can be created in one file

See Knowledge Base

Analysis Results are presented in interactive tables of stress, loads, displacements, expansion joint deformations, wall stability analysis, or internal forces. You can select operating mode, coordinate system, filter data, or sort data on-the-fly.

See Knowledge Base

Units can be changed very quickly before or after analysis. Just select the required units and they will be converted immediately for input data and analysis results.

Automatic wall thickness checking is provided for all piping elements (pipes, bends, tees, reducers).
See Knowledge Base
PASS/START-PROF uses a very fast and effective solver enabling friction iterations to converge in over 99.9% of models.
See Knowledge Base
PASS/START-PROF can take into account the equipment nozzle flexibility.
See Knowledge Base

PASS/START-PROF can check stresses in PUR insulation.

See Knowledge Base

PASS/START-PROF checks allowable load in all operating modes, not just only during support selection.

See Knowledge Base
PASS/START-PROF can select suitable constant springs from different manufacturer's catalogues.
See Knowledge Base
PASS/START-PROF always take into account the Bourdon effect which involves pipe elongation under internal pressure and bend rotation under internal pressure.
See Knowledge Base
Also PASS/START-PROF calculates the cold state of piping after cooling down from hot state considering the reverse effect of friction forces.
The elastic moments are considered that try to straighten the bend.
See Knowledge Base

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:

There are 2 types of pipes: ordinary pipes and rigid elements
See Knowledge Base

PASS/START-PROF can model soil flexibility + PUR insulation layer flexibility + expansion cushion flexibility including soil settlement and swelling modeling, longitudinal stability analysis, buoyancy and flooded soil. The user can simply specify soil type from database, and define the pipe depth to run the analysis without having to specify restrained and unrestrained zones, calculate the virtual anchor length, nor run a soil modeler. PASS/START-PROF will automatically do what is required for the correct soil simulation. PSRE has several years of experience modeling buried piping for District Heating and other applications.

See Knowledge Base

PASS/START-PROF can check stresses in PUR-Insulation.

See Knowledge Base

Vacuum piping wall stability check considering stiffening rings reinforcement is performed.

See Knowledge Base
Jacketed piping is modeled using a special pipe inside pipe model.
See Knowledge Base
Analysis performed according to special section of GOST 32388-2013
Analysis performed according to special section of GOST 32388-2013
Creep Effect (stress relaxation and self cold-springing effect) is considered for high temperature piping according to GOST, ASME, DL/T and EN codes.

Easy to use plastic piping analysis for polyethylene (PE), polypropylene (PP), polybutene (PB), Polyvinylidene fluoride (PVDF), polyvinylchloride (PVC) etc. according to GOST 32388-2013 is provided. Above-ground and buried plastic piping can be analyzed, including PUR insulation layer.

See Knowledge Base

Easy to use analysis can be performed according to ISO 14692. As easy as for steel piping. Above-ground and buried fiberglass piping can be analyzed, including PUR insulation layer.

Analysis performed according to special section of GOST 32388-2013 and according to ASME codes


PASS/START-PROF include following databases:

Contains the physical properties of pipe and fitting materials. Each piping code has own database section. Due to this, plastic piping, fiberglass (FRP, GRP) piping can be calculated as easy as steel piping. You just select preferred material from database.

See Knowledge Base

Contains variable spring support and hanger properties used for spring selection by the following manufacturers and codes:

  • NB/T 47039-2013
  • China Power
  • Pipe Supports Ltd
  • Carpenter & Paterson
  • Gradior
  • Pihasa
  • Pipe Support Systems GmbH (PSSI)
  • Piping Technology and Products Inc. (PT&P)
  • Sarathi
  • OST 108.764.01-80
  • OST 24.125.109-01
  • MVN 049-63
See Knowledge Base

Contains constant load spring hangers and supports properties used for selection by the following manufacturers and codes:

  • Pipe Supports Ltd
  • Carpenter & Paterson
  • NB/T 47038-2013
See Knowledge Base

Contains soil properties that are used for buried pipeline modeling

See Knowledge Base

Contains properties of expansion joints by different manufacturers:

  • Axial
  • Gimbal
  • Lateral
  • Universal
  • Slip Joints
  • Ball Joint
See Knowledge Base

Contains insulation weights

See Knowledge Base
Contains tee properties that are needed for stress analysis according to ANSI, EN, GOST standards

Contains bend properties that are needed for stress analysis according to ANSI, EN, GOST standards

Contains reducer properties that are needed for stress analysis according to ANSI, EN, GOST standards

Contains pipe properties that are needed for stress analysis according to ANSI, EN, GOST standards

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:

  • Above-groud
  • Buried
  • Rigid Element
See Knowledge Base
  • Elbow
  • Pipe Bend
  • Miter Bend (closely-spaced)
  • Long-radius Pipe Bend
  • Prestressed Long-radius pipe bend
  • Miter Joint (used for widely-spaced miter bend)
  • Non-standard Bend with Manual SIF and Flexibility Factors
See Knowledge Base
  • Welding Tee
  • Reinforced Fabricated Tee
  • Unreinforced Fabricated Tee
  • Stub-in
  • Weldolet
  • Sweepolet
  • Extruded Outlet
  • Plastic and FRP tee
  • Non-standard tee with manual SIF and flexibility factors ii, io, it, ia for run and header
See Knowledge Base
  • Anchor
  • Hinged Anchor
  • Sliding Support
  • Spring Hanger with Rotation rod
  • Spring Support with Friction
  • Constant Effort Hanger with Rotation Rod
  • Constant Effort Support with Friction
  • Guide Support (Single-Direction, Double-Direction)
  • Rigid Hanger, Rigid Stand with Rotation Rod
  • Snubber
  • Non-standard Restraint (any combination of Single-Direction, Double-Direction, Elastic restraints)
See Knowledge Base
  • Axial (Bellows, Lens, Slip Joint, One-time Compensator)
  • Gimbal
  • Lateral
  • Untied
  • Trosion
  • Ball Joint
  • Non-standard Expansion Joint
See Knowledge Base
  • Different Types of Cold Spring (Cold Pull)
  • Restraint Movements
See Knowledge Base
Additional Uniform and Concentrated Loads
Restraint Movements
See Knowledge Base
Valve flanges leakage is checked
See Knowledge Base
Flanges leakage is checked
See Knowledge Base
Ballasting Weight used against surfacing for flooded linear pipelines
See Knowledge Base
Joints can contain manual SIF factors
See Knowledge Base

System Requirements

Windows 10+
x86-64 architecture processor
4GB+ of RAM
Video card with OpenGL 2.0+ support and 1GB+ of RAM
Display resolution at least 1280x1024


The following codes are implemented into Start-Prof software:

Power Piping
  • ASME B31.1-2020 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 B31.3-2020 + Ch. IX Process Piping (USA)
  • EN 13480-2017 Metallic Industrial Piping (European Union)
  • GB/T 20801-2020 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 Addenda #1 (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)
Fitness for Service
  • ASME B31G-2012 (USA)
  • GB/T 19624-2019 (China)

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)


PASS/START-PROF can be delivered in different configurations to evaluate the piping stresses, displacements, and support loads from thermal expansion, cold-spring, soil and support subsidence, and other loads according to applicable standards and codes.

PASS/Start-Prof Complete Advanced

Simulation and sizing for any piping network considering all applicable national codes.

PASS/Start-Prof Complete Standard

configuration includes only worldwide popular standarts.

PASS/Start-Prof Process Advanced

Simulation and sizing for piping networks based on applicable national codes for process plants as well as for gas and oil transportation systems.

PASS/Start-Prof Process Standard

configuration includes only worldwide popular standarts.

PASS/Start-Prof Power Advanced

Simulation and sizing for any piping networks based on applicable national codes for power generation piping as well as for central heating networks.

PASS/Start-Prof Power Standard

configuration includes only worldwide popular standarts.


Piping stress analysis of high density polyethylene and/or fiberglass reinforced plastic piping systems.

Configurations Comparison

CodeComplete Advanced Process Advanced Power Advanced Complete Standard (40% discount) Process Standard (40% discount) Power Standard (40% discount) HDPE+FRP (40% discount)
ISO 14692
HDPE Piping
ASME B31.1
ASME B31.3
ASME B31.4
ASME B31.5
ASME B31.8
ASME B31.9
ASME B31.12
EN 13480
EN 13941
BS PD 8010
CSA Z662
GB 50316
GB/T 20801
GB 50251
GB 50253
GB/T 19624-2019
DL/T 5366
CJJ/T 81
RD 10-249-98
GOST R 55596
GOST 32388
SNiP 2.05.06-85
GOST R 55989
GOST R 55990
SP 284.1325800.2016
SP 33.13330.2012
SP 36.13330

Download Software

SoftwareLinkUpload Date
PASS/START-PROF Free Trial 4.85 R6 (English) zip, 287.48 MiB 11.06.2022
PASS/START-PROF Free Trial 4.85 R6 (Chinese) zip, 287.28 MiB 11.06.2022
Free PASS/START-PROF Model and Result Viewer 4.85 R6 (English)
Free PASS/START-PROF Model and Result Viewer 4.85 R6 (Chinese)
PASS/START-PROF 4.85 R6 (English)
PASS/START-PROF 4.85 R6 (Chinese)
PASS/START-Prof Lite 4.85 R4 (English)
Dongle Update (KeySt) for PASS/START-PROF zip, 7.64 MiB 06.07.2021
Dongle Drivers (SafeNet Sentinel 7.6.9) exe, 7.37 MiB 13.09.2017



Supporting Materials

PASS START-PROF Capabilities for District Heating Industry

PASS START-PROF Capabilities for District Heating Industry (Spanish)

PASS START-PROF Capabilities for Oil & Gas Gathering, Upstream and Midstream Pipelines

PASS START-PROF Capabilities for Oil & Gas Gathering, Upstream and Midstream Pipelines (Spanish)

PASS START-PROF Capabilities for Pipe Stress Analysis of Power and Process Piping Systems

PASS START-PROF Capabilities for Pipe Stress Analysis of Power and Process Piping Systems (Spanish)

PASS START-PROF Datasheet 2020

PASS START-PROF Overview 4.84 version (Italian)

PASS START-PROF Webinar for SPED Egypt Chapter December 2020

PASS START-PROF Webinar. Lo nuevo en 4.85. Dinamico (Spanish)

PASS START-PROF Webinar. What's New in 4.85. Dynamic

PASS START-PROF What's New in 4.84 version

PASS START-PROF What's New in 4.84 version (Spanish)

START-PROF Training Agenda

Additional PASS/START-PROF Resources