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Offshore Structural Analysis and Design (API 4F 5th edition)

Petroleum Structural Engineering® (PSE) Software Suite

Offshore Structural Analysis Software

API Specification 4F, 5th Edition, Drilling and Well Servicing Structures

The Petroleum Structural Engineering® (PSE) software specializes in Offshore Structural Analysis and Design for oil & gas drilling structures, including platforms, rigs, masts, and substructures in compliance to the API 4F 5th edition requirements.

3D Offshore Structural Analysis Software

Petroleum Structural Engineering® (PSE) Software Suite

The Petroleum Structural Engineering® (PSE) software specializes in Offshore Structural Analysis and Design for oil & gas drilling structures, including platforms, rigs, masts, and substructures in compliance to the API 4F 5th edition requirements.

This 3D frame analysis software offers intuitive modeling features, comprehensive structural analysis capabilities and powerful design tools. The PSE software is user-friendly, easy-to-use and built on a ribbon-based interface, offering a streamlined design element where tools, commands, and options are conveniently organized into tabs and groups for effortless access and navigation.

Offshore Structural Analysis and Design (API 4F 5th edition)
39 years of innovation

Delivering cutting-edge solutions to industry leaders since 1986.

Offshore Structural Analysis Software

Explore the extensive features and functionalities of PSE Software – Offshore Structural Analysis and Design software.

Fill out the following form to access the PSE Technical Brochure.

Core features of PSE Offshore Structural Analysis software

A structural analysis software for Oil&Gas professional engineers.

Compliance with the API 5th Edition

PSE Petroleum Structural Engineering® software is based on the API 4F (5th edition) Specification for Drilling and Well Servicing Structures.

Wind loads, based on the velocity component approach, and vessel dynamic motions are defined according to API 4F Specification for Drilling and Well Servicing Structures. The PSE software systematically incorporates the latest requirements and recommendations for suitable steel structures for drilling and well servicing operations for the Oil&Gas industry.

The PSE software is an innovative solution aiming to increase productivity of international companies helping them to achieve the most complex structural engineering projects.
Offshore Structural Analysis and Design (API 4F 5th edition)
Telecom Towers Structural Analysis and Design (ANSI/TIA-222-I and CSA S37-24)

Automatic wind wall calculation

Wind loads, calculated using the velocity component approach, are defined according to the API 4F Specification for Drilling and Well Servicing Structures (5th edition).

The Petroleum Structural Engineering® (PSE) software includes a specialized tool for generating wind and ice loads on open structures, such as drilling rigs. This feature enables automated calculation of wind and ice loads on each structural element.

PSE software streamlines wind load application by computing loads based on projected area, projected pressures, or velocity components. It offers a range of wind profiles and automatically determines shape coefficients (drag factors) for accurate load estimation.

Automated Calculation of Member Unbraced Lengths

The Petroleum Structural Engineering® software automatically determines unbraced lengths for structural members, ensuring accurate stability analysis. This feature optimizes design efficiency by eliminating manual calculations and improving reliability in load-bearing assessments.

Offshore Structural Analysis and Design (API 4F 5th edition)
Offshore Structural Analysis and Design (API 4F 5th edition)

Robust and comprehensive structural analysis

PSE software features comprehensive state-of-the-art structural analysis methods, including:

• Finite Elements Analysis (FEA) including plates and shell elements

• P-Delta Analysis, Linear and Nonlinear Analysis, Buckling Analysis

• Static Equivalent Seismic Analysis, Seismic and Dynamic Time-History Analysis

• Non-linear analysis using load control and displacement control strategy

• Linear and exact non-linear cable elements

• Direct Analysis Method (DAM) and the Effective Length Method (kL) for AISC 360

• Possibility to add non-structural components using Spatial Objects and Spatial Loads to automatically calculate dead, ice, and wind loads

Structural insights animation

PSE software allows users to animate analysis results, including static, P-Delta, buckling, seismic, and dynamic analyses. This visualization highlights displacements, internal forces, stresses, reactions, mode shapes, and time-history data, offering clear insights into structural behavior.

Animating envelopes focuses on critical regions, simplifying complex data for better decision-making during dynamic events.

SAFI Structural Analysis software Results Animation
Offshore Structural Analysis and Design (API 4F 5th edition)

Vessel Dynamic Motions

The Petroleum Structural Engineering® (PSE) software integrates advanced vessel dynamic motion analysis, adhering to the API 4F (5th edition) Specification for Drilling and Well Servicing Structures.
• Accurate inertial force calculation: Accounts for vessel dynamic motions and the impact of radial, tangential, and translational forces from mass acceleration.
• Comprehensive motion simulation: Models roll, pitch, and yaw rotations along with heave, sway, and surge translations, ensuring precise structural response analysis.
• Optimized for offshore environments: Designed for offshore drilling structures on vessels, semisubmersibles, and floating hulls, enhancing design reliability and safety.

Wave and Current Loads

The Petroleum Structural Engineering® software provides advanced analysis of wave and current loads on submerged structural members in platforms and floating hulls, following API RP 2A specifications.

•  Comprehensive load analysis: Accurately computes wave and current forces acting on structural members.
•  Linear & nonlinear kinematics: Supports Airy’s linear theory and Fenton’s nonlinear theory for precise wave kinematics modeling.
•  Optimized for offshore structures: Ensures stability and performance of submerged components in dynamic marine environments.

Offshore Structural Analysis and Design (API 4F 5th edition)
SAFI Structural Analysis software Custom Reports

Advanced custom reporting

PSE software offers advanced custom reporting tools, enabling users to create tailored, professional reports with ease. With options to select relevant data, add individual or multiple tables, and customize settings, users can design layouts that meet specific project needs.

Editable titles, table reordering, and predefined templates enhance efficiency, while saved custom layouts streamline future reporting. Reports can be customized and exported to Microsoft Word and Excel, streamlining workflows.

Comprehensive results visualization

Results and input data can be visualized, printed, and exported with flexible options for customization, reporting formats, and graphics sharing.

• Visualize results graphically or numerically.
• Print input data and results for the entire structure or specific parts using graphical selection or element ranges.
• Customize lists of input data and results for printing.
• Reports available in multiple formats: SAFI™ reports, Excel, Access, and ASCII text files.
• Graphics can be printed or copied to the clipboard for use in other programs.
SAFI Structural Analysis software Custom Reports
Offshore Structural Analysis and Design (API 4F 5th edition)

Intuitive graphical interface

PSE software features an intuitive, ribbon-based graphical user interface powered by DirectX 11 and OpenGL 2.0 for enhanced performance. Users can efficiently create, analyze, and design complex models, visualized as lines, wireframes, or 3D solids.

Users benefit from key functionalities such as detailed element creation, and transparency options for components like members, plates, surfaces, spatial objects and panels.

Additionally, powerful edition features allow to model very complex and non-standards towers. The software supports metric, imperial, and mixed unit systems, which can be modified at any time. 

PSE Software Reviews

Trusted to empower productivity since 1986

5/5
''The SAFI PSE software was built with the engineer and designer in mind. The SAFI team has thought of every feature an engineer needs to design and optimize a structure. The program is very intuitive and easy to pick up. The support team is very responsive and knowledgeable. They can troubleshoot any modeling issue that comes up. ''
CHARLES VORA, PE
Veristic Technologies, Inc. - Houston, USA
5/5
''The SAFI PSE software is one of the most suitable structural analysis and design tool for onshore and offshore rigs. I was fortunate to work in both environments and I find that it is closely tailored to the industry's compliance. What can I say about customer support? Imagine that customer support is just a call away, always available and knows exactly what I need. ''
Sugrim Sagar
M.Sc. P.Eng. - Texas, USA

PSE Software

3D Offshore Structural Analysis Software

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Offshore Structural Analysis and Design (API 4F 5th edition)

API Specification for Drilling and Well Servicing Structures (5th edition)

Wind loads

Wind loads, based on the velocity component approach, are defined according to API 4F Specification for Drilling and Well Servicing Structures (5th edition).


The API 4F specifications for wind loads based on the velocity component approach is integrated into the PSE Petroleum Structural Engineering software. Accordingly, drilling structures are classified based on their Structural Safety Level (SSL) and their offshore or onshore location.


The design reference wind velocity Vref value chosen should be a 3-second gust wind measured at an elevation of 10 m (33 ft) in open terrain or water, with an associated return period of 50 or 100 years.

The Petroleum Structural Engineering® software has a tool to generate wind and ice loads on open structures such as drilling structures. It allows generating automated ice loads or wind loads on each element of the structure.

The PSE software automates wind loads applied to members. These loads are calculated based on the projected area, projected pressures or velocity components approaches. The program offers a variety of wind profiles and automates the determination of the shape coefficients (drag factors).

The PSE software allows different configurations of the drilling structure models according to a given wind environment. The program requires the input of the rated design wind velocity, Vdes, and accounts for the design reference wind velocity and wind velocity multiplier. The program computes the local wind velocity, Vz, by scaling the rated design wind velocity by the appropriate elevation factor, ß, in order to obtain the velocity for estimating the wind forces.


The API 4F specifications are applicable to the following wind environments:

  • Operational wind
  • Erection wind
  • Transportation wind
  • Unexpected wind
  • Expected wind

A wind profile in a selected direction provides the wind intensity that generates the wind loads to structural members and surface areas. As many as required wind directions can be defined through different basic loads.

Member selection procedures allow the application of the wind profile to the entire structure or to specific zones and excluding members behind or in front of wind walls. It is possible to apply the API 4F wind loads directly to elements such as equipment, wind walls and other objects attached to the drilling structures.

The shape coefficient (Cs) is automated in the PSE software for various section shapes. The program accounts for the gust factor (Gf) and the reduction factor for shielding (Ksh) for members and appurtenances.

Vessel motions

In the PSE Petroleum Structural Engineering® software, vessel dynamic motions are defined according to API 4F (5th edition) Specification for Drilling and Well Servicing Structures.


The inertial forces due to the vessel dynamic motion as well as radial, tangential and translational forces due to the acceleration of masses attached to the drilling structures have a significant influence on design and reliability.


In various production wells, the offshore drilling structures are located on top decks of vessels, semisubmersible or floating hulls. Vessel motion includes roll, pitch and yaw rotations and heave, sway and surge translations.

The PSE software computes the inertial forces due to the vessel dynamic motion as well as radial, tangential and translational forces due to the acceleration of masses attached to the drilling structures. These forces have a significant influence on the structural design and reliability of offshore structures.

The PSE software accepts three types of user input in order to estimate the inertial forces induced by the vessel dynamic motions:
– Linear displacements, angular rotations and time periods
– Linear and angular velocities and accelerations
– Linear accelerations at two points in the vessel which are converted to linear and angular accelerations by the program.

High pressure mud piping, electrical cable trays, junction boxes, racking boards, tong counterweights, turning sheaves, deadline anchors, crown accessories, casing stabbing baskets and other outfitting items add weight to the derrick. Weight data is converted to masses applied at the correct locations on the derrick.

Wave and current loads

Wave and current loads generated forces applied to submerged structural members in platforms and floating hulls are analyzed through linear and nonlinear kinematics in accordance with the API RP 2A specifications.

The PSE software computes wave and current forces applied on the structural members. The wave kinematics can be established using either Airy’s linear theory or Fenton’s nonlinear theory.

The linear kinematic theory is valid where the wave height is small compared to the water depth. On the other hand, the nonlinear kinematic theory, proposed by J.D. Fenton, solves the motion equations by representing the velocity potential and surface elevation with a Fourier series.

 

The later method minimizes the error of each parameter governing the wave motion equations and is valid over the entire spectrum.

The PSE software accounts for the following wave profiles and kinematic parameters:

  • Wave period
  • Incidence angle
  • Elevation of the sea bed
  • Elevation of the still water line (SWL)
  • Kinematic reduction factor
  • Crest position criterion

Preview of the wave surface profiles, velocities and accelerations at any point is readily available.

According to commentary C.3.2.1 of the design code API RP-2A-2003, the Doppler effect is accounted for by calculating an apparent period defined as the wave period as seen by an observer moving with the current.

Marine growth increases the cross section diameter and surface roughness of the members and it is defined by a set of elevation-thickness pairs.

In the PSE software, the current profile is described with respect to the sea bed. The current speed is defined by a set of elevation-velocity-angle triplets and the reduction of the current speed in the vicinity of the structure or the blockage factor is accounted for.

 

In order to combine the current with the wave profile, the current needs to be stretched, or compressed, to the local wave surface. Two stretching methods are available:

 

  • The linear stretching method, also known as the Wheeler stretching
  • The nonlinear method, or hyperbolic stretching

The input for the member wave loads consists of the following six parameters:

 

  • Current profile
  • Wave profile
  • Marine growth profile
  • Drag coefficient
  • Inertia coefficient
  • Shielding factor

The member forces, calculated using Morison equation, vary according to the position of the waves with respect to the structure. In order to obtain the maximum forces in the members, the critical position of the wave crest is determined by the program.

Specifications

Perform Advanced Structural Analysis

The PSE software has comprehensive structural analysis methods such as FEA Finite Elements Analysis, Static Analysis, Linear and Nonlinear Analysis, P-Delta Analysis, Natural Frequency Analysis, Static Equivalent Seismic Analysis, Dynamic Time-History Analysis, Seismic Time-History Analysis, Modal Analysis, Spatial Objects and Spatial Loads, Buckling Analysis, Response Spectrum Analysis, Advanced Section Stress Analysis, Torsion and Warping, Built Up Sections, Catenary Cables, Nonlinear springs, Diaphragm Analysis, Horizontal Notional Loads, Loads and Load Combinations.

State-of-the-art analysis tools
FEA including plates and shell elements
Torsion including restrained warping of open sections
Linear and exact non-linear cable elements (catenary cables)

Non-linear analysis using load control and displacement control strategy for better convergence
Possibility to add non-structural components using spatial objects

Complying with seismic requirements
Automated static equivalent method of the building codes (NBCC and IBC)
Seismic response spectrum, seismic time-history, and dynamic time-history analysis
Customized response spectrums and accelerograms
Fully customizable analysis parameters
Maximal response using CQC and SRSS methods
Automated or user defined damping
Graphical display of response spectrums and accelerograms
User defined incidence angle of seismic loads and vertical components
Customized analysis and output time steps
Time-history results can be provided for selected parts of the models

Benefit from result animation

The PSE software allows users to animate results from different types of analysis such as:
Static linear analysis
Static P-Delta analysis
Buckling analysis
Natural frequencies analysis
Seismic and dynamic analysis

Users can animate various static linear and P-Delta analysis results such as:
Structure displacements
Internal forces
Stresses
Support reactions

Frequency and Buckling
The frequency and buckling analysis provide multiple mode shapes describing multiple behaviors of the structure. With large models, the animation is helpful to discern and understand the mode shapes. It is easier to determine if the buckling mode is a local or global phenomenon. It also provides a very accurate interpretation of the participating mass of each mode in a seismic spectral analysis.

Time-History
The animation function displays every saved time-step to provide an accurate representation of the displacements, velocities, accelerations and internal forces acting on the structure.

This will provide users a better understanding of the structure behavior during the dynamic event, such as finding the critical time of the dynamic loading.

Animating the envelopes helps minimizing the amount of information on the screen. Users can focus on the most critical regions of the model.

Learn more about the Animation Feature

Design and Verification in Compliance with American Standards

Design and verification are carried out in accordance with American standards AISC 360-16 (LRFD and ASD), AISC-LRFD-99, and AISC-ASD-89. The PSE software accounts for axial compression, bending, tension, axial flexion, shear, as well as torsion and warping design.

Software Capabilities

Petroleum Structural Engineering® software incorporates reduced section properties for structural steel sections from the AISC standard section library in the 14th Edition of the AISC Steel Construction Manual (T_eff = 0.93 T_nominal). It includes the Direct Analysis Method (DAM) and the Effective Length Method (kL) as outlined in AISC 360-16. The DAM considers initial imperfections using theoretical loads and reduces stiffness according to AISC 360-16. It also provides a semi-automated command to calculate buckling factors (K).

Features and Standards

  • Standard profiles: CISC, AISC, or European sections, or parametric profiles (various shapes available).
  • Customizable calculation parameters: Resistance calculations (unsupported lengths, buckling lengths, buckling factors, etc.) can be customized graphically or through spreadsheets.
  • Compliance with the latest revisions of standards: CAN/CSA S16, AISC ASD and LRFD, and Eurocode 3 and 4.
  • Latest revisions of CSA S136 and AISI S100 standards.
  • Symmetric, asymmetric, and built-up sections covered for all design standards.
  • Limit state design results represented with color-coded outputs.

Steel Verification

Steel verification includes classification, strength, and stability checks as per the design standards. The software calculates the strength of steel elements under bending, compression, tension, shear, and combined forces based on linear analysis, P-Delta, non-linear, seismic, and dynamic analysis results.

Intuitive modeling features

Users can model structures using an intuitive graphical user interface powered by DirectX 11 and OpenGL 2.0 for increased speed and capabilities and generate executive and customizable formatted reports in Microsoft Word and Excel worksheets.

Manipulate models graphically with extreme flexibility.
The unmatched graphical user interface of the PSE software allows to create, analyze and design large and complex bridge models quickly and easily. Bridge models can be shown as lines, wire frames, or can be rendered as 3D solids. Functionalities of the PSE program allow to generate automatically detail elements in an automatically generated mesh perimeter. An object transparency option is available for various components such as current selection, solid members, plates, surfaces, spatial objects, panels.

Versatile modelling tools
The PSE software includes powerful and productive features to generate any type of models:
Local coordinate systems
Linear or circular lines of constructions for model creations
Automated commands for model creation such as move, rotate, extrude, copy, attach, subdivide and others
Models can be edited either graphically or by means of spreadsheets
Elements can be created in batch or one by one
Elements of the models can be selected either graphically or according to a set of criterions
Persistent groups of selected objects can be created and edited graphically or by means of spreadsheets
Powerful edition and automatic generation tools
Similar connected members can be merged together
Elements of the structure can be renumbered according to several criterions
Element attributes can be set graphically or by means of spreadsheets (sections, analysis parameters, rotation angles, etc.)
Surfaces can be used for load transfer and self-weight calculation.

Unit systems
Metric, imperial, and mixed unit systems are allowed and can be modified at any time.
Reports are printed according to any unit system.

Display features

The program manages to scale the size of the various pictures including toolbar buttons in order to make the user interface easy to use on every monitor, even on very high-resolution monitors.
3D solid display of all section shapes.
Ultra-fast 3D visualization in wire frame or solid modes.
Customized display of all graphical objects.
Partial model visualization.
Results can be displayed on screen for the whole or a part of the structure.
Results can be displayed for each element separately by means of graphics and numerical results spreadsheets.
Results can be displayed for a set of elements by means of numerical results spreadsheets.
Graphical display of seismic and dynamic analysis results.
Model size limited only to the physical capacity of the computer.
Objects transparency for various components such as current selection, solid members, plates, surfaces, spatial objects, panels.
The level of transparency may be customized for each type of object from the Display Options command.
Functionalities of the PSE program allow to generate automatically detail elements in an automatically generated mesh perimeter.
These functionalities are specifically related to the refinement area, the opening, the linear constraint and the punctual constraint.
All detail elements added to the PSE model will be automatically connected to the finite element mesh.
The mesh perimeter will also connect any elements already in the model to the mesh perimeter automatically if they are in the plane of the mesh contour.

Comprehensive reports

The PSE software provides an exhaustive set of result features that include graphical views, diagrams, numerical tables, and text reports.

Results can be visualized either graphically or numerically.
Customized list of input data and results to be printed.
All graphics can be printed or copied to the clipboard for use in external programs.
Reports can be generated in:
-Microsoft Word
-Microsoft Excel
-Unformatted text (.txt)
Generate the report for the whole model or a selection of elements.
Printing limit states results for the critical results only for each member or for physical member for the critical combination.

File import and data exchange

IFC (INDUSTRY FOUNDATION CLASSES)
The integration of the IFC in the PSE program enables importation of models from a large number of architectural and structural software. IFC-Architecture interface for importing models from Revit or other IFC compliant programs.
IFC (Industry Foundation Classes) is an open and neutral data format allowing the definition of related classes to all construction objects. It is dedicated to the building sector and aims to software interoperability (all editors, all applications).
IFC is the most widely used protocol for information exchange and sharing between different platforms of BIM (Building Information Modeling).

AutoCAD interface to import and export models by way of a DXF file.
The solid view of the structure may also be exported when exporting to AutoCAD.

The SDNF (Steel Detailing Neutral File) interface exports beams, columns and braces to SDNF compatible detailing software.
The KISS (Keep It Simple Steel) interface exports beams, columns and braces to KISS compatible estimation software.
If required, members subdivision and account for physical elements will be carried out automatically.