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


  Quick Pipe Stress Analysis and Optimal Sizing


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.

PASS/START-PROF was created to be easy to use by “regular” designers without special knowledge in pipe stress analysis and/or detailed knowledge of standards.

PASS/START-PROF® – Renowned, one of the first world commercial piping stress analysis software.

While enabling “regular” designers, PASS/START-PROF is also an excellent tool for professional piping stress engineers. There are no obscure options, settings and questions. Just draw the piping system and run the analysis and smart algorithms will do the rest of the job for you!

Enabling new users to perform piping/equipment analysis in days rather than months.

PASS/START-PROF has a smart, easy and friendly user interface and user's manual in English, Chinese, and Russian languages. Even the beginner can perform pipe stress analysis without any special training. PASS/START-PROF enables faster piping modeling than other software.

Process and piping engineers of more than 2,000 companies in many countries already use the software every day for stress analysis and design of different types of pipelines.

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 offers many functions that make piping model creation very quick including: group editing, quick loop addition, node point renumbering, and spring data application. PASS/START-PROF can import piping models ready for analysis from AVEVA PDMS and E3D, Caesar II, and PCF formats. Data can also be exchanged within the PASS suite and with a large spectrum of general and special purpose CAD and CAE software tools.

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

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
  • 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 axial, gimbal, lateral flexible joints by different manufacturers

See Knowledge Base

Contains insulation weights

See Knowledge Base
Contains tee properties that are needed for stress analysis

Contains bend properties that are needed for stress analysis

Contains reducer properties that are needed for stress analysis

Contains pipe properties that are needed for stress analysis

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
  • 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
  • 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 7/8/10+
IA-32 or AMD64 / EM64T architecture processor
1GB of RAM
Video card with OpenGL 2.0+ support and 1GB+ of RAM
Display resolution at least 1024x768, recommended 1280x1024


The following codes are implemented into Start-Prof software:

    • 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)
    • 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)
    • 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)
    • ASME B31.4-2016 + Ch. IX & XI Liquid Transportation (USA)
    • ASME B31.8-2018 + Ch. VIII Gas Transmission (USA)
    • 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)
    • ISO 14692-3:2002/Cor 1:2005 (International)
    • GOST 32388-2013 (Russia)
    • ASME B31.5-2016 Refrigeration piping and heat transfer (USA)
    • ASME B31.9-2014 Building Services Piping (USA)
    • ASME B31J-2017 Stress Intensification and Flexibility Factors
    • API 610 11th Edition, Centrifugal Pumps (USA)
    • GOST 32601-2013, Centrifugal Pumps (Russia)
    • WRC-297

    • GB 50011-2010 (China)
    • SNiP II-7-81* (Russia)
    • SP 14.13330.2018 (Russia)
    • NP-031-01 (Russia)

    • 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

    • 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)

    • ASCE 7-16 (USA)
    • GB 50135-2006 (China)
    • SP 20.13330.2016 (Russia)


Start-Prof has interfaces with following design and analysis software:

Software Import into Start-Prof Export from Start-Prof

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.


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

Global Standards
configuration includes only worldwide popular standarts.


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

Global Standards
configuration includes only worldwide popular standarts.


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

Global Standards
configuration includes only worldwide popular standarts.


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

Configurations Comparison

CodeComplete Process Power Complete Global Standards (40% discount) Process Global Standards (40% discount) Power Global Standards (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
EN 13480
GB 50316
GB/T 20801
GB 50251
GB 50253
DL/T 5366
CJJ/T 81
RD 10-249-98
GOST R 55596
GOST 32388
SNiP 2.05.06-85
SP 36.13330

Download Software

SoftwareLinkUpload Date
PASS/START-Prof 4.83 R6 (English)
PASS/START-Prof 4.83 R6 (Chinese)
PASS/START-Prof Viewer 4.83 (Chinese)
PASS/START-Prof Viewer 4.83 (English)