Finite element program CPIPE is designed to perform stress and stability calculations, modal analysis of aboveground and underground pipelines, considering the nonlinear interaction with soil in a trench and/or pipeline supports.
CPIPE has a wide potential for modeling piping, supports and soil conditions. It allows to create a mathematical model of the pipeline that follows as closely as possible for the real construction. CPIPE have automatic stress-strain checks of the pipelines according to the main Codes for pipeline design.
CPIPE licenses are issued to end Users according to the Agreement between P2T Engineering LLC and CSoft. According to this agreement, CSoft is an exclusive distributor of CPIPE software package.
CPIPE is developed by the authoring team led by Yu. M. Temis
Certificate of state registration of computer programs No. 2016617164
CPIPE has the compliance certificate No. ROSS RU.SP15.N00927 (РОСС RU.СП15.Н00927)
Finite element program CPIPE is designed to fulfill static and dynamic calculations of stress and stability for aboveground (on supports) and underground (in soil) pipings and pipelines.
The development of the calculation units of the CPIPE started in the late 1980s. The CPIPE is based on more than 30 years professional experience of the authoring team in the field of pipeline design and calculation using highly effective and accurate methods for the calculations of the stress-strain state of constructions.
Key options of CPIPE include the following:● Calculation of underground and above-ground pipelines
● Creation of parametric mathematical models
● Built-in database of materials, pipes, and fittings
● Automated placement of pipes, tees, bends, gate valves, etc.
● Various kinds of loads and boundary conditions
● Non-linear models of pipe-soil friction and interaction
● Built-in soil model and database of basic types of soil
● Static and modal analysis of pipelines
● Visualization of deformed geometry and stresses
● Animation of modal vibrations
● Generation of hypertextual reports
● Checks of pipelines for requirements of major Codes
The particular advantage of CPIPE is the built-in libraries of pipeline elements (pipes, bends, tees, flanges, gate valves, etc.), materials, mechanical characteristics of basic types of soil (sand, sand-clay, sandy loam, loam).
The major users of CPIPE are design istitutes of Transneft, Gazprom, Rosneft, their subsidiaries and others.
CPIPE have three main modules:● Preprocessor, that is used to prepare source data for calculations. Preprocessor includes pipes, fittings and soils databases;
● Solver, that solves the system of equations, provided by the Preprocessor;
Preprocessor allows the following:● Creation of wireframe models of pipeline (it is possible to import the model from AutoCAD dxf-file);
● Creation of models of branched pipelines in any configuration (aboveground and underground);
● Creation of pipeline mathematical model (import of dimensions for pipes, bends, tees, reducers, flanges, back valves, gate valves and blank flanges from the databases provided by the software; ASME standard included);
● Creation of an expansion joints object model;
● Creation of road intersection by pipeline in casing pipe;
● Automated building of a pipeline object model based on a wireframe model;
● Creation of ground surface to automatically determine the position of underground pipeline sections and backfill height;
● Setting different soil characteristics for underground pipeline sections;
● Usage of different types of supports: anchor support, sliding base (Coulomb friction), saddle, guide support, spring support;
● Setting different boundary conditions for places of equipment tie-in’s;
● Setting preliminary displacements for supports;
● Setting loads and boundary conditions in pipeline mathematical model;
● Setting temperature drop, internal pressure, concentrated and distributed loads, filler characteristics;
● Setting snow load, ice load, and wind load;
● Setting seismic load;
● Generation of drawings of any projection for pipeline system construction and linear pipeline portion;
Solver produces the following actions:
● Automatically generates finite element model of pipeline system;
● Performs static analysis of the finite element model of a pipeline in elastic field with the usage of non-linear elements (soil, Coulomb friction);
● Performs modal analysis: calculations of eigenfrequencies and modes for aboveground pipelines;
● Optimizes FE nodes numbers to speed up of calculation process.
Postprocessor provides the following:● Visualization of initial and deformed geometry of pipeline system;
● Visualization of distributions for stress, displacements and other parameters in 3D model;
● Review of the calculation results in interactive mode;
● Display and animation of pipeline system natural modes;
● Providing calculation results in HTML-tables;
● Verification of compliance of the pipeline stress-strain state with the following Codes: SP 36.13330.2012 (SNiP 2.05.06-85*), SP 33.13330.2012 (SNiP 2.04.12-86), GOST 55990-2014, SP 34-116-97, STO Gazprom 2-2.1-249-2008, STO Gazprom 2-2.1-318-2009, RD-23.040.00-KTN-110-07;
● Providing anchor support force with load addition, according to SNiP 2.05.06-85* (p. 8.44);
● Setting parameters of seismic load for calculations of additional stresses in straight underground pipelines due to seismic forces directed along longitudinal axis, according to the following Codes: SP 36.13330.2012 (SNiP 2.05.06-85*), SP 33.13330.2012 (SNiP 2.04.12-86), GOST 55990-2014, SP 34-116-97, STO Gazprom 2-2.1-249-2008, STO Gazprom 2-2.1-318-2009, RD-23.040.00-KTN-110-07. These stresses might be used for stress output and Codes verification