1 Pipe Stresspdf Better | Fluor Piping Design Layout Training Lesson

Lesson 1: Pipe Stress Analysis in Fluor Piping Design Layout Training

Introduction

Pipe stress analysis is a critical aspect of piping design and layout. It ensures that the piping system can withstand various loads, including pressure, temperature, and external forces, without failing or causing damage to surrounding equipment or structures. In this lesson, we will discuss the fundamentals of pipe stress analysis and its importance in fluor piping design layout.

What is Pipe Stress?

Pipe stress refers to the internal forces that develop within a pipe due to various loads, such as:

1. Pressure: Internal pressure of the fluid flowing through the pipe.
2. Temperature: Changes in temperature that cause expansion or contraction of the pipe.
3. External forces: Forces applied to the pipe from external sources, such as supports, valves, or other equipment.
4. Weight: Weight of the pipe, fluid, and any attached equipment.

Types of Pipe Stress

There are several types of pipe stress, including:

1. Hoop stress: Stress that develops in the circumferential direction of the pipe due to internal pressure.
2. Longitudinal stress: Stress that develops in the longitudinal direction of the pipe due to internal pressure, temperature changes, and external forces.
3. Bending stress: Stress that develops in the pipe due to bending forces, such as those caused by supports or external loads.
4. Torsional stress: Stress that develops in the pipe due to twisting forces, such as those caused by eccentric loading.

Pipe Stress Analysis

Pipe stress analysis involves evaluating the stresses in a piping system to ensure that they are within acceptable limits. The analysis typically involves:

1. Identifying loads: Identifying all loads that act on the piping system, including pressure, temperature, external forces, and weight.
2. Calculating stresses: Calculating the stresses in the pipe using mathematical models and equations.
3. Evaluating stress limits: Evaluating the calculated stresses against allowable stress limits for the pipe material.
4. Optimizing design: Optimizing the piping design to minimize stresses and ensure safe operation.

Importance of Pipe Stress Analysis

Pipe stress analysis is crucial in fluor piping design layout because it:

1. Ensures safety: Helps prevent pipe failures, which can lead to accidents, injuries, and environmental damage.
2. Reduces maintenance: Helps minimize maintenance costs by identifying potential problems early in the design phase.
3. Optimizes design: Helps optimize the piping design to reduce costs, improve efficiency, and increase system reliability.

Best Practices for Pipe Stress Analysis

To perform effective pipe stress analysis, follow these best practices:

1. Use accurate data: Use accurate data, including pipe material properties, fluid properties, and load conditions.
2. Use suitable software: Use suitable software, such as pipe stress analysis software, to perform calculations and simulations.
3. Consider all loads: Consider all loads that act on the piping system, including pressure, temperature, external forces, and weight.
4. Evaluate stress limits: Evaluate calculated stresses against allowable stress limits for the pipe material.

By following these best practices and understanding the fundamentals of pipe stress analysis, you can ensure that your fluor piping design layout is safe, efficient, and reliable.

Conclusion

Pipe stress analysis is a critical aspect of fluor piping design layout. It ensures that the piping system can withstand various loads without failing or causing damage to surrounding equipment or structures. By understanding the types of pipe stress, performing pipe stress analysis, and following best practices, you can optimize your piping design and ensure safe and reliable operation. In the next lesson, we will discuss pipe support design and its importance in fluor piping design layout.

This draft report summarizes the core content of Fluor Daniel’s Piping Design Layout Training: Lesson 1 (Pipe Stress), a foundational module for designers with basic piping skills. Overview of Lesson 1: Pipe Stress

The primary objective of this lesson is to provide self-directed training on simple stress analysis procedures required during the layout study phase. It emphasizes the use of Fluor Corporation standards while acknowledging that client-specific requirements often take precedence. 1. Key Learning Objectives

Standards Adherence: Understanding the importance of Fluor Technical Practices and client-specific engineering guidelines.

Fundamental Concepts: Mastery of stress vs. strain, the yield point of materials, and allowable stress limits to ensure system integrity.

Design Responsibility: Training designers to manage piping systems effectively to prevent failures during operational lifespans. 2. Critical Stress Analysis Components

Primary Stresses: Analysis of hoop and axial stresses caused by internal/external pressure and applied forces.

Thermal Expansion: Managing the expansion and contraction of pipes due to temperature changes, which is a leading cause of cyclic stress.

Load Evaluation: Assessing sustained loads (weight), expansion loads (thermal), and occasional loads like wind, seismic activity, or water hammer.

Nozzle Loads: Ensuring forces exerted on connected equipment (pumps, vessels, exchangers) remain within manufacturer-specified limits. 3. Tools and References

Software: Fluor primarily utilizes AutoPipe (licensed) for complex stress calculations, though designers also use CAESAR II.

Standard Calculations: The lesson references specific Fluor Technical Practices: 000.250.2041: Plant Arrangement and Pipeway Layout. 000.250.2220: Stress Design Sketch Procedures. 000.250.9823: Coefficient of Expansion Tables. 4. Practical Training Requirements 1.0 Introduction to Pipe Stress Analysis

The Fluor Piping Design Layout Training (Lesson 1: Pipe Stress) is a foundational instructional module developed by Fluor Daniel to guide piping designers through simple stress analysis procedures during the layout study phase.  Core Lesson Objectives 

Lesson 1 is designed for self-directed learning for designers who already possess basic piping skills. It focuses on the following key areas: 

Simple Stress Analysis Procedures: Learning how to perform basic calculations and evaluations necessary for initial layout studies.

Adherence to Standards: Emphasizing the use of Fluor standards as a primary guide, while acknowledging that client-specific standards may take precedence on particular projects.

Terminology and Materials: Familiarizing designers with common terminology, stress requirements, and material specifications relevant to the layout process.

Error Prevention: Equipping designers with the knowledge to identify and avoid common mistakes during early layout planning.  Essential Concepts Covered 

The training underscores that piping systems must be treated as "alive" due to their movement and temperature changes. 

Thermal Expansion: Understanding how growth and movement must be incorporated into the overall design for both the specific line and neighboring lines.

Load Management: Evaluating how systems handle weight, internal pressure, and external forces like wind or seismic activity. Lesson 1: Pipe Stress Analysis in Fluor Piping

Frictional and Anchor Forces: Recognizing that expansion exerts forces on pipe supports, which must be accounted for in the layout.

Support and Flexibility: Controlling stress by strategically adding supports, loops, and restraints to ensure flexibility and prevent leaks or excessive nozzle loads.  Designer Responsibilities in Lesson 1 

A central theme of the training is the designer's responsibility to balance layout efficiency with structural integrity. 

Iterative Design: If stress requirements are not met, designers must iterate the layout—adjusting routing and support locations—until a satisfactory balance is achieved.

Standards Consistency: Designers are taught to utilize official training materials available through internal portals like Knowledge Online to ensure they are using the most up-to-date revisions. 

Piping Stress Analysis (ASME B31.3) Guide & Flexibility - NWE Group

Piping stress analysis is a foundational pillar of safe and efficient plant design, ensuring that piping systems can withstand the mechanical and thermal loads encountered during their service life.

Lesson 1 of the Fluor Piping Design Layout Training focuses on the procedures for simple stress analysis required during the layout study phase. Adherence to Fluor standards and client-specific guidelines is critical, as these provide the baseline for design adequacy and operational integrity. Core Objectives and Principles

The primary goal of the initial training is to equip designers with the skills to perform self-directed stress analysis, preventing premature failures and ensuring stresses remain within code-defined allowable limits.

Systemic Thinking: Designers must view piping as a complete system from equipment to equipment, including all branches and supports, rather than isolated components.

Standards Adherence: While general principles apply, specific projects often use unique client engineering standards that may differ from previous experiences.

Safety and Integrity: The layout must satisfy economic, process, and maintenance requirements while strictly managing thermal stress and mechanical safety. Essential Design Considerations

Effective layout planning requires a deep understanding of how various factors influence the mechanical behavior of the system.

Governing Codes: Most process piping design follows standards like ASME B31.3, which defines allowable stresses for materials at specific temperatures.

Load Types: Stresses are categorized into primary loads (e.g., pressure and weight) and occasional loads (e.g., wind, earthquakes, or water hammering).

Thermal Expansion: Changes in temperature cause physical growth or contraction. Layouts must incorporate flexibility, such as expansion loops, to handle these movements without overstressing connected equipment.

Nozzle Loads: Piping forces and moments must be kept within manufacturer limits for connected equipment like pumps and vessels to prevent mechanical failure or leakage at flanges. Key Piping Support Definitions

Correctly identifying and placing supports is vital for managing system movement and stress distribution. Support Type Movement Characteristics Guide Stops sideways movement. Allows movement parallel to the pipe's centerline. Support Prevents downward motion. Primarily handles the weight of the pipe and fluid. Anchor Restricts all degrees of freedom. Often equipment nozzles serve as full, rigid anchors. Practical Layout Guidelines

During the layout study, several "best practices" help minimize stress issues before they reach a formal CAESAR II analysis phase.

Elevation Changes: When piping changes direction, it should also change elevation to help manage flexibility, though designers must avoid creating "pockets" that trap fluids.

Pipe Racks: Lines should be arranged on horizontal racks with clear spacing for maintenance and inspection.

Accessibility: Layouts must provide headroom and clearances for removing equipment internals like exchanger bundles or pump shafts.

The Fluor Piping Design Layout Training (Lesson 1: Pipe Stress) enables designers to perform preliminary stress analysis during the layout phase, focusing on mechanical fundamentals and Fluor standards. It covers key concepts including load classification, piping restraints, and methods for ensuring layout flexibility to avoid excessive stress. Read the full document on Course Hero.

Fluor Daniel - Piping Design Layout Training.pdf - Course Hero

It sounds like you’re looking for Lesson 1 of a training series on Fluor piping design & layout, specifically covering pipe stress—and you want something better than a standard PDF.

While I cannot distribute Fluor’s proprietary internal training manuals (copyrighted), I can provide you with a structured, improved Lesson 1 that captures industry-best practices for pipe stress as taught in major EPCs (Fluor, Bechtel, Worley). This is designed to be clearer and more practical than a typical dense PDF.

Fluor’s Rule for Designers:

If the stress PDF shows an operating displacement > 1 inch at any support point, you specified the wrong support type. Change it to a variable spring, then re-route to eliminate the spring in Revision 2.

6. The "Rules of Thumb" for Layout Designers

Fluor’s training often concludes Lesson 1 with practical heuristics designers should apply before sending the model to the Stress Engineer:

1. Avoid "Trap" Configurations: A configuration where thermal expansion is locked in from multiple sides (a "square" box with connections on all sides).
2. Leg Lengths: Ensure legs running perpendicular to the main expansion are long enough. A short leg acts like a rigid member; a long leg acts like a flexible spring.
3. Proximity to Nozzles: Do not place an anchor or guide immediately next to a pump nozzle. This transmits thermal growth directly to the pump. Allow some "run" length for flexibility.
4. Friction is Real: Do not ignore friction. A pipe sliding on a Teflon slide plate has a friction coefficient of ~0.1; on steel, it is ~0.3. This friction force is transmitted to the support and equipment.
5. 3D Visualization: Always visualize thermal growth. Use your hands to simulate: "This line heats up and expands 2 inches. If I hold it here, where does that 2 inches go?"

7. Lesson 1 Assignment: Sketch a "Better Stress" Layout

Scenario:
Route a 6" carbon steel line from a reactor nozzle (Anchor 1, 600°F) to a distillation column nozzle (Anchor 2, 300°F). Distance = 80 ft straight line. Available space: 15 ft wide x 20 ft high corridor.

Poor layout (fails stress): Straight 80 ft pipe with two supports.
Why fails: Thermal expansion = 2.0 inches. No flexibility. Elbow loads > 15,000 psi.

Fluor-recommended layout (passes stress):

1. Exit reactor vertically 10 ft.
2. 90° long-radius elbow to horizontal.
3. Run 25 ft, then 90° up 8 ft, then 90° horizontal 30 ft, then 90° down 10 ft to column.
4. Resulting shape: Two expansion loops in series.
5. Predicted stress PDF result: Max stress ratio = 0.62. No spring hangers required.

Your turn: Sketch this on grid paper. Then open Caesar II (or your company’s tool) and verify. The "better" PDF will have zero red flags.

7. Common Mistakes to Avoid

Based on Fluor-level design standards, here are the "Rookie Mistakes" covered in Lesson 1:

1. The "Wind Tunnel" Effect: Using guides too close together, creating a rigid tunnel that cannot expand.
2. Ignoring Friction: Assuming a pipe slides effortlessly on a support. (Friction adds horizontal force).
3. Over-reliance on Loops: Installing a loop without checking if it actually helps the specific nozzle it is connected to.
4. Cold Spring: Applying

The Fluor Piping Design Layout Training (Lesson 1: Pipe Stress) acts as a foundational module for designers, focusing on integrating simple stress analysis into the piping layout phase to prevent costly revisions. Key takeaways include utilizing company-specific standards for flexibility checks, managing thermal expansion, and verifying that equipment nozzle loads remain within acceptable limits. For more details, visit Course Hero

Fluor Daniel - Piping Design Layout Training.pdf - Course Hero Pressure : Internal pressure of the fluid flowing

"Fluor Piping Design Layout Training: Lesson 1 Pipe Stress" is a foundational 2002 training module from Fluor Daniel widely utilized by professionals for teaching how layout choices directly impact pipe stress. It is highly regarded for its focus on practical, preventative design strategies, though contemporary, updated software training is recommended for modern application. Access the document on Scribd. Fluor Piping Design Layout Training (Lesson 1 Pipe Stress)

The document you are looking for, Fluor Piping Design Layout Training Lesson 1: Pipe Stress

, is a specialized technical training module originally developed for internal use by Fluor. It covers the fundamental procedures for conducting simple stress analysis during the layout phase of piping design. Course Hero Core Training Content

: The lesson is designed to equip piping designers with the skills to identify potential stress issues early in the layout phase to prevent failures and ensure system integrity. : It emphasizes using Fluor Daniel's

internal engineering standards while acknowledging that specific client guidelines may vary by project. Key Topics Covered

Procedures for simple stress analysis during layout studies. Terminology and common materials used in piping systems.

Responsibilities of the designer regarding stress and support.

Expansion loops and thermal force limitations, specifically for equipment like pumps. Course Hero Where to Find the PDF

Several educational and document-sharing platforms host versions of this training manual: Course Hero : Offers a detailed Fluor Daniel - Piping Design Layout Training document that includes Lesson 1 (Pipe Stress). : Contains a direct upload titled Fluor Piping Design Layout Training (Lesson 1 Pipe Stress) Academia.edu : Provides a PDF version under the title Lesson Nov-15 SOPORTES

which covers the same stress analysis and layout objectives. Academia.edu other lessons in this Fluor series, such as those focusing on heat exchangers

Fluor Daniel - Piping Design Layout Training.pdf - Course Hero

Ready to create a study guide? Use Canvas to save, edit, and share your guide Get started Fluor Piping Design Layout Training (Lesson 1: Pipe Stress)

is a foundational module designed to equip piping designers with the skills to conduct simple stress analysis during the layout study phase. This training emphasizes that designers are responsible for routing pipe for both flexibility and support, ensuring the mechanical integrity of the system before it reaches a dedicated stress engineer. Course Hero Core Objectives of Lesson 1

This lesson provides self-directed training for designers who already possess basic piping design skills. Its primary goals include: Course Hero Stress Requirement Awareness

: Familiarizing designers with necessary stress checks when developing a layout. Terminology Mastery

: Understanding key terms and materials used in analysis, such as nomographs and stress critical line lists. Error Prevention

: Identifying common pitfalls in pipeways, pump layouts, and vertical vessels to avoid costly late-stage design changes. Adherence to Standards

: Following Fluor-specific engineering standards while remaining adaptable to client-specific guidelines. Fundamental Concepts in Pipe Stress

The training covers the essential physics and mechanical constraints that dictate how a piping system must be arranged. Principal Stresses

: Designers must account for longitudinal (bending/pressure), radial (internal/vacuum pressure), and circumferential (hoop) stresses. Anchor Definitions Full Anchors

: Restraints that prevent all movement and twisting in any direction. Directional Anchors

: Restraints that stop movement parallel to the pipe centerline but allow sideways motion. Routing for Flexibility

: A key principle is avoiding straight-line runs from origin to terminus. Building flexibility into the routing is significantly more cost-effective than using expansion joints. Course Hero Key Considerations for Layout Studies Importance in Layout Thermal Expansion

Absorbing growth through loops and offsets to prevent equipment nozzle overstressing. Sustained Loads

Managing the combined effects of internal pressure and the dead weight of pipe, fluid, and insulation. Occasional Loads

Accounting for environmental factors like wind, seismic activity, and dynamic events like water hammer. Equipment Interaction

Limiting forces and moments acting on connected equipment (pumps, turbines, vessels) to manufacturer-allowable levels. Training Materials & Resources

For those looking to deepen their understanding, several resources and platforms host the original Fluor training documents: Fluor Training PDF

: The original Lesson 1 document is often accessible via the Fluor Knowledge Online portal or through educational repositories like Course Hero Supplemental Guides : Related training modules often include Pump Piping Stress Analysis Pipe Support Standards to provide a complete engineering picture. for thermal expansion or the critical line list criteria used in this training? Fluor Piping Design Layout Training (Lesson 1 Pipe Stress)

Fluor Piping Design Layout Training Lesson 1: Pipe Stress Analysis for Better Design

Piping design and layout are critical components of any industrial facility, including those in the oil and gas, chemical processing, and power generation sectors. A well-designed piping system ensures safe and efficient operation, while a poorly designed system can lead to equipment damage, safety hazards, and costly repairs. In this article, we will focus on the importance of pipe stress analysis in piping design and layout, and provide an overview of the key considerations and best practices for Fluor piping design layout training.

Introduction to Pipe Stress Analysis

Pipe stress analysis is a critical step in the design and layout of piping systems. It involves evaluating the stresses and loads imposed on pipes, fittings, and equipment due to various factors such as pressure, temperature, and external loads. The primary goal of pipe stress analysis is to ensure that the piping system can withstand these stresses and loads without causing damage to equipment, piping, or supporting structures.

Why is Pipe Stress Analysis Important?

Pipe stress analysis is essential for several reasons: Types of Pipe Stress There are several types

1. Safety: Pipe stress analysis helps identify potential safety hazards, such as excessive pipe movement, equipment damage, or pipe failure, which can lead to accidents and injuries.
2. Equipment Protection: Pipe stress analysis helps protect equipment, such as pumps, turbines, and heat exchangers, from damage caused by excessive pipe stress, vibration, or movement.
3. Piping System Reliability: Pipe stress analysis ensures that the piping system can operate reliably and efficiently, minimizing downtime and reducing maintenance costs.
4. Cost Savings: Pipe stress analysis can help reduce costs by identifying potential problems early in the design phase, avoiding costly repairs or replacements later on.

Key Considerations for Pipe Stress Analysis

When performing pipe stress analysis, several key considerations must be taken into account:

1. Pipe Material and Size: The type and size of pipe used can significantly impact pipe stress. Different materials have varying properties, such as modulus of elasticity, Poisson's ratio, and thermal expansion, which affect pipe stress.
2. Pressure and Temperature: Pressure and temperature fluctuations can cause significant stress in pipes. The analysis must consider both steady-state and transient conditions.
3. External Loads: External loads, such as wind, seismic activity, or equipment vibration, can also impact pipe stress.
4. Piping Configuration: The piping configuration, including bends, tees, and valves, can affect pipe stress and must be carefully evaluated.

Pipe Stress Analysis Methods

Several methods are available for pipe stress analysis, including:

1. Simplified Stress Analysis: This method uses simplified equations and assumptions to estimate pipe stress.
2. Detailed Stress Analysis: This method uses more complex equations and finite element analysis (FEA) to evaluate pipe stress in detail.
3. Dynamic Stress Analysis: This method evaluates pipe stress under dynamic conditions, such as during seismic activity or equipment startup.

Best Practices for Fluor Piping Design Layout Training

To ensure effective Fluor piping design layout training, the following best practices are recommended:

1. Understand Pipe Stress Fundamentals: Trainees should have a solid understanding of pipe stress fundamentals, including pipe material properties, pressure and temperature effects, and external loads.
2. Use Industry-Standard Software: Trainees should be familiar with industry-standard software, such as Caesar II, AutoPIPE, or Pipe-Flo, for pipe stress analysis.
3. Evaluate Piping Configurations: Trainees should learn to evaluate piping configurations, including bends, tees, and valves, to minimize pipe stress.
4. Consider Thermal Expansion: Trainees should understand the importance of thermal expansion and how to account for it in pipe stress analysis.

Lesson 1: Pipe Stress Analysis Basics

In this lesson, we will cover the basics of pipe stress analysis, including:

1. Pipe Stress Fundamentals: Pipe material properties, pressure and temperature effects, and external loads.
2. Pipe Stress Analysis Methods: Simplified stress analysis, detailed stress analysis, and dynamic stress analysis.
3. Pipe Stress Criteria: Allowable stress limits, stress intensification factors, and fatigue considerations.

Conclusion

Pipe stress analysis is a critical component of piping design and layout, ensuring safe and efficient operation of industrial facilities. By understanding pipe stress fundamentals, using industry-standard software, and evaluating piping configurations, Fluor piping design layout trainees can develop the skills needed to design and layout piping systems that meet industry standards and best practices. In Lesson 2, we will build on these fundamentals and explore more advanced topics in pipe stress analysis.

Downloadable Resources

For those interested in learning more about pipe stress analysis, we recommend the following downloadable resources:

• Pipe Stress Analysis Handbook: A comprehensive guide to pipe stress analysis, including theory, methods, and best practices.
• Pipe Stress Analysis Software: Industry-standard software, such as Caesar II or AutoPIPE, for evaluating pipe stress.

PDF Resources

For those who prefer to learn from PDF resources, we recommend the following:

• Pipe Stress Analysis Tutorial: A step-by-step guide to pipe stress analysis, including examples and case studies.
• Pipe Stress Analysis Guidelines: Industry guidelines and standards for pipe stress analysis, including ASME B31.1 and API 1104.

By following these resources and completing the Fluor piping design layout training lessons, you will be well on your way to becoming a proficient piping designer and layout specialist.

In the complex world of industrial engineering, the Fluor Piping Design Layout Training (Lesson 1: Pipe Stress) stands as a foundational guide for designers. This article explores the core principles of pipe stress analysis as taught in this curriculum, emphasizing how layout choices directly impact system safety and longevity. The Role of the Piping Designer in Stress Analysis

Lesson 1 clarifies that while "stress engineers" often handle complex simulations, piping designers are responsible for the initial layout that makes a system viable. A well-planned layout reduces the need for expensive modifications, such as additional expansion loops or specialized supports, later in the design phase.

According to the Fluor Daniel Training Manual , designers must use Fluor standards as their primary guide while adapting to specific client engineering requirements. Fundamental Stress Considerations in Layout

Effective piping design involves managing several types of loads that can lead to structural failure if not addressed during the initial layout:

Thermal Expansion: As temperatures fluctuate, pipes expand or contract. Layouts must include enough flexibility (offsets, bends, or loops) to absorb this movement without overstressing the pipe or connected equipment like pumps and turbines.

Weight (Dead Load): This includes the weight of the pipe itself, its contents, insulation, and fittings. Proper support spacing is critical to prevent sagging and bending stresses.

Pressure Stresses: Internal pressure causes both hoop stress (circumferential) and axial stress. While wall thickness is usually determined by P&IDs, the layout must handle the resulting forces on anchors and supports. Core Layout Principles for Better Stress Management

To optimize a layout for stress, the training emphasizes several practical strategies:

Elevation Changes: When piping changes direction from longitudinal to transverse, designers should also change elevation to avoid pockets and simplify support placement.

Grouping Strategy: Cold and hot piping should be grouped separately. Hot, uninsulated lines are typically placed at higher elevations, while uninsulated lines prone to ice build-up should never run above walkways.

Heaviest Lines Placement: To maintain structural stability in pipe racks, the heaviest lines should be located furthest from the center of the rack.

Avoiding Small Bore Interference: Small pipes should not be trapped between large, hot pipes, as the thermal movement of the larger lines can damage the smaller ones. Training Objectives and Testing

The Fluor Piping Design Layout Training is a self-directed program designed to enhance the skills of designers with basic piping knowledge. Key objectives include: Fundamentals of Pipe Stress Analysis in Piping Design

1. Lesson Objective

By the end of this lesson, the trainee will understand how piping layout decisions directly affect pipe stress, flexibility, and system integrity. The focus is not on performing stress calculations, but on designing layouts that avoid excessive stress.

Key Fluor Principle: “A good layout inherently solves 90% of stress problems before analysis begins.”

6. Fluor’s Stress Critical Line Criteria

Not all lines require formal stress analysis. Fluor typically screens lines using:

| Parameter | Stress Analysis Required? | |-----------|----------------------------| | Temperature > 300°F or < -50°F | Yes | | Large bore (>24”) and >200°F | Yes | | Connected to rotating equipment | Yes (nozzle load check) | | Lines with expansion joints | Yes | | Any line with visible layout constraints | Yes (judgment call) |

Trainee Note: If in doubt, add flexibility. Removing metal is cheaper than relocating supports after stress reports.

2.1 Stress Categories (per ASME B31.3)

| Stress Type | Cause | Failure Mode | Design Limit | |-------------|-------|---------------|----------------| | Primary | Pressure, weight, sustained loads | Plastic collapse / bursting | ( S_h ) (hot allowable) | | Secondary | Thermal displacement | Fatigue cracking | ( S_A ) (allowable expansion stress range) | | Peak | Local discontinuities (attachments, supports) | Low-cycle fatigue | Limited via fatigue rules |

Fluor Note: Layout designers focus on secondary stresses – the result of constrained thermal movement.