پشتیبانی و انجام سایر خدمات در زمینه کامپوزیت، اپوکسی و …

Engineering Services

Pishro Sazeh Peyvand Bartava Company, using its engineering knowledge in the field of composites, related standards and composite design and analysis software, has the ability to design and produce various types of composite parts. Experiences and activities of this company in the field of hydraulic design of composite pipelines and pipes, determining the thickness and type of fibers required in the construction of a composite piece, how the porcelain layer to achieve maximum strength, analysis and validation of the design performed using Abaqus software is. Among the company’s capabilities in the field of composite design can be mentioned the following:
  1. Perform hydraulic calculations of composite pipelines
  2. Aries impact calculations in composite pipelines
  3. Stiffness calculations for pipes and composites
  4. Buckling and Buckling Calculations
  5. Stress analysis and validation using reputable software such as abaqus
  6. Design and perform calculations related to determining the thickness of composite pipes and tanks and other complex parts
  7. Design of short-term and long-term tests to determine the properties of parts made according to valid standards
  8. Perform the necessary calculations and tests to determine the pipe design diagram of pipe envelop
  9. Calculations and designs for abutments used in composite pipelines
  10. Calculation and design of anchor blocks used in composite pipe lines
  11. Determining the production method of parts according to the expected mechanical properties of the product

Stress analysis of composite pipelines using Caesar II software

Pipeline stress analysis To design pipelines, it must be possible to properly consider all the loads on the piping system and design the system so that it is under the least stress to increase the life of the system and its efficiency. CEASAR II software helps engineers a lot when designing high temperature piping systems. CEASAR II software will make system analysis easier and more reliable by combining and considering many of the limitations contained in the standard codes, the limitations of the system itself and the limitations of the additional equipment installed in the system. In addition to modeling static loads, this software will also have the ability to model dynamic and expansion loads. Purpose of stress analysis Pipelines
  • Keep the amount of stress in the pipes and fittings in the system lower than the allowable values ​​provided in the standard codes.
  • Keep the load on the equipment nozzle, which is connected to the piping system, lower than the allowable values ​​provided by the manufacturers and standard codes.
  • Keeping the tension created in the tank nozzle at the connection to the piping system based on the allowable values ​​provided by the manufacturers and standard codes.
  • Calculate and design the load on the support in order to select the type and size of the supports.
  • Determining piping system displacements to check these values ​​at equipment connection points and other points.
  • Investigation of dynamic problems in the piping system.
  • Help improve system design.
Stress analysis in pipes FRP Based on 100 years of experience and growing technology, engineers can select, design and analyze metal and steel pipes with complete confidence and achieve acceptable results. The problem is different for FRP pipes and other pipes made of composite materials. In the case of FRP, not enough experience has been gained in stress analysis. Many manufacturers perform a variety of stress tests such as cyclic and hydrostatic pressure tests, uniaxial tensile and compressive stresses, bending as well as combined load tests and long-term tests on FRP components. Based on long-term and short-term tests performed by the manufacturers using BS 7159, UKOOA and BS14692, the stress analysis of composite pipe lines can be performed using Caesar II software. The analysis of FRP components is performed in different stages of Micro, Mini and Macro. The UKOOA code is in many ways similar to the BS 7159 code, and the difference is that it simplifies the computational requirements and, at the same time, places more restrictions on the working conditions of the piping system. Instead of explicitly calculating the combined stress, the UKOOA code combines axial environmental stresses to define a two-dimensional diagram of the package from which failure occurs. This chart is called Idealized Envelope and is based on this relationship:
Conservatively, the UKOOA code restricts the user to a range of curves below the intersection line (known as (0: 1)) at the intersection point on the curve, where it doubles (the normal condition for a pressurized pipe). he does. For a better understanding, pay attention to the following figure

Figure (5): Idealized Envelope diagram

Assigning a confidence interval (usually) to compressive stresses is an implicit change given in this range. This coefficient is not assigned to other times. The said change establishes the following conditions:

P des = Permitted design pressure
F 1 = Reliability is usually 0.85
F 2 = Reliability is usually 0.67
F 3 = Permissible residual stress ratio, after applying equal mechanical loads
σ b a = Axial flexural stress due to mechanical loads
r = σ_aa (0: 1) / σ_a (2: 1)
σ_a ^ b (0: 1) = Long-term axial tensile strength without compressive load
σ_a ^ b (0: 1) = Axial tensile strength in the long run only in the presence of compressive load
LTHS = Long-term hydrostatic resistance (allowable environmental stress)
LTHP = Long-term permissible hydrostatic pressure
Support for composite pipelines Support, in practice, refers to the process of determining, selecting the type and location of supports in the piping system to withstand the loads, control the stress and the load on the nozzles. An abutment analyst and designer, in fact, has the knowledge to place abutments and various constraints in the piping system. This work is one of the sensitive and important engineering design processes in the design of piping systems and requires a lot of knowledge and experience. The first goal of the support process is to withstand the force of gravity. Applying the first support in the system means binding it and creating tension in the system. The equipment in a system is perhaps the most important, expensive and vital part of any project. Maintaining their health, safety and longevity is very important. The piping system, as an intermediate system between equipments, should be designed in such a way as to avoid creating hazards for them in the face of this set. Reducing the forces and moments on the equipment by the piping system is another goal and support task. Increasing system security and maintenance is actually the most important issue in the system. Ensuring the safety of the piping system as part of a project in terms of forces and stresses in the system, is the responsibility of support. Types of supports Weight support ( Rest ) This type of support is used to withstand the force of gravity and its line of action is in the direction of gravity. The force exerted on this type of support is in both the left and right directions of the plane and is only equal to the force of friction.
Support for composite pipelines Support, in practice, refers to the process of determining, selecting the type and location of supports in the piping system to withstand the loads, control the stress and the load on the nozzles. An abutment analyst and designer, in fact, has the knowledge to place abutments and various constraints in the piping system. This work is one of the sensitive and important engineering design processes in the design of piping systems and requires a lot of knowledge and experience. The first goal of the support process is to withstand the force of gravity. Applying the first support in the system means binding it and creating tension in the system. The equipment in a system is perhaps the most important, expensive and vital part of any project. Maintaining their health, safety and longevity is very important. The piping system, as an intermediate system between equipments, should be designed in such a way as to avoid creating hazards for them in the face of this set. Reducing the forces and moments on the equipment by the piping system is another goal and support task. Increasing system security and maintenance is actually the most important issue in the system. Ensuring the safety of the piping system as part of a project in terms of forces and stresses in the system, is the responsibility of support. Types of supports Weight support ( Rest ) This type of support is used to withstand the force of gravity and its line of action is in the direction of gravity. The force exerted on this type of support is in both the left and right directions of the plane and is only equal to the force of friction.

support weight

Support engineers should first determine the location of the weight supports and, as a first point, consider that the location of some of the supports should be as close as possible to the concentrated loads. The maximum distance between two weight supports on horizontal pipes depends on the maximum deflection of the pipe. The allowable distance between the weight support for GRP pipes is based on the pipe size according to the table below

Permissible distance between weight supports for GRP pipes (UKOOA)

Vertical support of vertical pipes It should be noted that only one weight support is performed on vertical lines. But you can get the required number of support guides Used on vertical lines.

B) Execution of weight support under the vertical valve

A) Different applications of weight support on vertical pipes

Binder ( Guide ) This type of support is used to control lateral movements and displacements in the tube plate. The distance of the guide supports is selected by the analyzer according to the stress analysis. For initial support, a guide support can be used between both weight supports. The application of the support guide is mainly divided into the main part:
  1. Earthquake control.
  2. Expansion guidance.

Run the guide guide under the valve flange

Pipe length ( line Stop ) This type of support is used to prevent the pipe from moving in the axial direction and moving it. Note that one or more longitudinal constraints are not used in a row. If the line is long, it is possible to use several longitudinal constraints, of course, by embedding an expansion loop between each pair of longitudinal constraints.

Execution of Stopper support

Semi-Anchor If the restraining support is used in conjunction with a longitudinal restraint of the pipe at a point, the movement of the pipe in lateral and axial directions will be prevented. This type of support is called Semi Anchor. In fact, this support is a combination of weight, guide and stopper supports. Fully Anchor If we restrain all the degrees of freedom of the pipe at one point with the support (ie prevent movement and rotation in all three directions of space), this support and its corresponding point on the pipe is called Fully Anchor. For example, if we weld the shoe or false foot connected to the pipe to a metal structure or screw it to the foundation, this type of support is obtained.

Execution of anchor support under the valve flange

Hold Down

The support that does not allow the pipe to move in the opposite direction of the weight or in other words prevents the pipe from lifting is called Hold Down.

Hold Down Support