Introduction to Finite Element Analysis or FEA

Written by Anu Sharma in Caesar II,Mechanical,Piping Interface,Piping Stress Analysis,Piping Stress Basics,Start-Prof

In recent times, FEA or Finite Element analysis is the most widely used method for solving engineering and mathematical models. Using Finite Element Analysis or FEA, a physical phenomenon is simulated to find close to real behavior. FEA is developed using a numerical mathematic technique known as the Finite Element Method, or FEM. Finite Element Analysis is a computer-aided numerical analysis program that solves complex problems in many engineering fields. The complex problems might be

thermal analysis such as steady-state and transient,
structural analysis such as stress, vibration, and deflection, and
fluid dynamic analysis such as turbulent and laminar flow.

Basically, with the help of this method, one can find stress distribution in complex geometries. It provides solutions to problems that are anyway difficult to obtain. In other words, the finite element analysis method is a faster way to get solutions to problems that are difficult to solve.

**Fig. 1: Graphical Representation of an Equipment in an FEA Tool**

FEA Meaning

In simple language, finite element analysis or FEA is the right approach to problems like when a force is applied on a solid, what could be the values of the displacements, strains, and stresses at each material point? The most logical answer is that FEA tells us where a particular object can break or strain to make it unusable. The most common problems solved by FEA involve determining stress intensity factors of a load on an object. This can be in any form such as solid mechanic analysis, thermal analysis, structure analysis, dynamics, and electrical analysis.

How Does Finite Element Analysis Work?

Finite element analysis software creates a mesh of millions of smaller elements to create the complete structural shape. The effect of the parameter for example internal pressure force is assessed on each element and then combined to arrive at the final result for the full equipment or structure.

Importance of Finite Element Analysis or FEA

Finite Element Analysis is the basis of modern software simulation with the results shown on a computer-generated color scale. There are some theories that state that finite element analysis has its roots in the 16th-century work of Euler, which is the earliest mathematical paper describing the technique dating back to Shellback’s work of 1851. This method was then developed by engineers from various industries around the world thereby helping the user to solve a large number of structural mechanic problems, basically in civil engineering and aerospace. The very first development of finite element analysis for real applications began in the 1950s.

Finite element analysis is important as it plays a major role in the product design and development process. It has the capability to identify where a problem can occur in a product or an object. This method uses mathematical calculations to solve the problem areas of an object, thereby saving engineers the time and effort required to build a physical prototype. On the other hand, prototype tests as compared to FEA do not provide numerical calculations which makes the product development process quite long. Finite element analysis software saves both time and effort for the engineers. The importance of this software lies in its ability to take a complex design and highlight the efficiency and robustness of the design. With the help of FEA, engineers can quickly understand early information on system failures and their improper design techniques.

The finite element analysis method is used in almost all engineering disciplines. It is known to be the alternative to the experimental test method being set in many standards. It works in such a way that a user can reach an approximate solution to any complex problem by dividing the component into smaller or finite elements.

Advantages of FEA

There are numerous advantages of FEA:

It is used in many engineering disciplines for the estimation of structural behavior and strength, design optimization, modeling, and simulation.
It is used in piping design where rigidity is a governing factor instead of flexibility.
There are a few limitations of beam element software like CAESAR II that experienced engineers and designers are aware of. CAESAR II may indicate stress or sometimes loading issues that may not exist and sometimes fail to point out the issues.
The application of FEA software is created to address problems related to piping and pressure vessel that CAESAR II and code limitations cannot resolve.
It helps in solving problems related to buckling and plasticity.
Buckling is a concern where Piping and pressure vessel geometries have a large D/t ratio or external pressure. In this case, FEA analysis of pressure vessels helps to analyze buckling and elastic-plastic collapse study.
Thermal gradients through the wall often result in significant stresses. In this case, it also, FEA helps in analyzing steady-state transient thermal stresses.
Optimal use of a model.
It gives comprehensive result sets by generating a physical response of the system at any location which might have been neglected in the analytical approach.
It provides rapid calculation time and low investment for most applications.
It provides engineers with simultaneous calculation and visual representation of a number of physical parameters like stress, and temperature and helps the designer to quickly analyze performance and necessary modifications.
It helps to gain a thorough understanding of the behavior of the product and the nature of the application.
An FEA tool improves the quality of user analysis for critical service lines.
FEA tool automatically includes coverage of B31J2017 ASME B31 code in the analysis and hence gives more accurate flexibility and SIF factors for necessary components.

Finite Element Analysis software

There is numerous finite element analysis software available in the market and it’s really difficult to choose. Widely used engineering finite element analysis software are:

ANSYS: US-based full CAE software package.
AutoDesk CFD: Finite Element Analysis software of Autodesk.
Nozzle-Pro: By PRG
ROHR2fesu: Finite Element Analysis of substructures in ROHR2.
PASS/EQUIP Nozzle-FEM: By PASS
Abaqus: Advanced Franco-USA software from SIMULIA, owned by Dassault Systemes
MATLAB: MATLAB Toolbox for solving structural, thermal, electromagnetics, and other general PDEs
Solidworks FEA Simulation
RFEM: 3D finite element analysis software
Advance Design: BIM software for FEM structural analysis, including international design eurocodes.
OpenFOAM: By the OpenFOAM Foundation
Simscale: German 100% web-based CAE platform
VisualFEA: FEA software for structural, geotechnical, heat transfer, and seepage analysis.
RoboLogix: By Logic Design Inc.
COMSOL Multiphysics: COMSOL Multiphysics Finite Element Analysis Software (formerly FEMLAB)
IVRESS: By Advanced Science & Automation Corporation
Altair HyperWorks Suite: By Altair Engineering
Advanced Simulation Library: By Avtech Scientific
SU2: By Stanford University
PRO/II Process Engineering: By AVEVA
Ingrid Cloud: By Adaptive Simulations
Nastran: Originally developed for NASA, now available commercially from several software companies

Out of the above ANSYS is the most widely used FEA software. For Nozzle load checking Piping and Mechanical Engineers use the NozzlePRO or PASS/EQUIP Nozzle-FEM package.

When to use the CAESAR II FEA module

Caesar II FEA module can be used during the following circumstances:

To check nozzle loads where WRC 107/297 are often inaccurate and not comprehensive.
When the d/D ratio is greater than 0.5, that is, to examine large branch intersections.
For piping having D/t ratios of more than 100.
To calculate accurate operating bolt load while performing flange analysis.
To accurately estimate SIF and flexibility for piping analysis.
Piping systems that use thin-walled welding tees.
To determine external loads on saddle-supported vessels.
When a piping system requires a more accurate spring hanger design.
Piping systems that are connected to sensitive or rotating equipment.
Piping Systems are anticipated to have operating cycles of more than 7000.
When there is short or stiff piping in a system where k factors have a large impact.
When a piping system has questionably high calculated stresses.

**Fig. 2: Different Graphical Representation in Caesar II and Nozzle Pro**

Examples of Finite Element Analysis

We will explain the results by taking an example of a piping system as shown below in Fig. 3:

There are two pumps. Both of these pumps combined to a common header as shown in Fig.3 Here we have used FEATools to reduce the loads on the nozzles of pumps A and B at odes 120 and 570. The load on the nozzle having node no.120 is FX=1140lb and for node no. 570, FX= 3626lb. The question here is whether will FEA Tools help in Caesar II analysis.

SIF and flexibilities can be refined to new factors at the tee location with the help of FEA Tools, hence we will see if this results in reducing the loads at the pump nozzles.

Table 1 in Fig. 4 shows the global element forces for pumps A and B before using FEA Tools and Table 2 shows the global element forces after using FEA Tools respectively.

**Fig. 4: Tabular Comparison of Results with and without FEA**

Conclusion: SIF and Flexibility are updated based on ASME 07-02, with suitable changes to appendix D of the B31 codes. Also, it is quite clear that there is a lot of incorrect SIF from ASME B31J that has been shown and provide the user with incomplete guidance. Further to be noted, for branch connections, the omission of k-factors allows for ASME 07-02 to correct these errors. Basically, the use of FEA Tools does not really mean that it can reduce the nozzle loads until the stresses reach the allowable stress.

Fig.5 shows the added restraints and spring at the branch connection as per the guidelines in 07-02 of FEA Tools.

**Fig. 5: ASME 07-02 Tee Conversion Detail**

To the center point of the tee, each branch is connected by a series of connecting nodes with k factors as per the allowable in ASME 07-02. The purpose of the added spring would be to reduce the stress caused due to thermal strain in a piping system. Such types of piping systems are best applicable with expansion joints or expansion loops when no other solutions are successful or not ideal in Caesar II analysis. Hence an analyst can conclude that FEA Tools itself cannot reduce the loads significantly enough to create that much difference in the equipment’s overall loads. One must think of other options to reduce the loads in the pump nozzles.

ASME B31J the engineer should use stress intensification factor and flexibility factor data from the code in the absence of applicable data. In order to supply this applicable data to CAESAR II, FEA-Tools uses the results of the latest research, analysis, and testing.

FEA vs FEM

Are FEA and FEM the same or are there any differences!!

FEA (Finite Element Analysis)	FEM (Finite Element Method)
FEA is the application of FEM	FEM is the cause or reason. It is the background theory behind FEA software.
This is the same as FEM. Engineers involve FEM to predict the performance of their designs in different conditions.	A numerical technique that is used to get approximate solutions of the partial differential equations.
It is related to solids and can be used for anything.	Here the analysis could be solid, fluid, thermal, or electromagnetic.
It is most popular in industries.	It is popular in universities.
It covers a wide area of problems related to heat transfer, the strength of materials, vibrations, and acoustics.	It includes the Galerkin method, numerical integration methods, and weighted residual method to solve problems.
It is learning basic FEM concepts, and solid mechanics and using them in FEA software like ANSYS.	It is totally solid mechanics and finite elements and solving problems using coding or numerical methods.

Table: FEA vs FEM

Is Finite Element Analysis Difficult?

Knowing the full background theory and equations for performing the FEA analysis is really a difficult and time-consuming job. However, the application of FEA software is quite simple. All the required algorithms and equations are already fed into the software. So, FEA software is also similar to other stress analysis software.

Online Courses on Finite Element Analysis

To develop your strength in finite element analysis you can opt for the following online courses

Preventive Maintenance: Definition, Types, Philosophy, Advantages, and Disadvantages

Written by Anup Kumar Dey in Maintenance,Piping Interface

With constant wear and tear happening in every piece of equipment in its running condition, efficiency reduction or equipment breakdown is bound to occur. One popular and widely used solution against these is Preventive Maintenance or Preventative maintenance. Such practices help in increasing the useful life of the equipment and they postpone the failure point. Studies have revealed that 78% of manufacturing facilities use preventive maintenance philosophy to some extent. In this article, we will explore the definition of preventive maintenance, its types, maintenance strategy, advantages, and disadvantages.

What is Preventive Maintenance?

Preventive Maintenance is a proactive planned maintenance philosophy involving regular and routine maintenance of equipment at a predefined interval to increase the lifespan of assets, equipment, and infrastructure. It reduces the likelihood of failure which in turn reduces the unplanned downtime of the operating plant. Through scheduled cleaning, lubrication, repairs, adjustments, oil changes, and part replacements, a preventive maintenance approach improves the operational output of equipment and machinery in a plant.

Preventive maintenance is not only routine maintenance of equipment. Knowing the lifespan of the equipment and maintaining accurate records of each and every inspection and servicing is also part of preventive maintenance. Using these records maintenance professionals can diagnose problems when they occur and decide the appropriate time to change parts. Various kinds of preventive maintenance software can help maintain and organize such data.

Types of Preventive Maintenance

Three types of preventive maintenance are widely popular in industries. They are:

Time-Based Maintenance
Usage-Based Maintenance and
Failure-Finding Maintenance

Time-Based Maintenance:

Time-based maintenance is also known as Calendar-based maintenance. This approach is followed for essential equipment. This maintenance approach ensures the equipment in optimal working condition and can be triggered at fixed time intervals regardless of the condition or usage of the asset. The time interval for maintenance must be decided based on the equipment manufacturer’s guidelines.

Usage-Based Maintenance:

In the Usage-Based Predictive Maintenance type, maintenance is typically scheduled after a certain usage of the equipment. Using meter readings or records, such maintenance is triggered. For example, normal automobiles may require servicing or engine oil change after every 10,000 km of driving.

Failure-Finding Maintenance (FFM):

Failure-finding preventive maintenance is an inspection to find or discover defects or failures in equipment. For example, a fire alarm is triggered to find out if the alarm is working and to find any fault in an alarm system.

Preventive Maintenance Examples

Depending on the type of industry, the examples of preventive maintenance will vary. However, whatever the industry, preventive maintenance programs will always have the following three components:

It’s systematic
It’s performed routinely
Its purpose is to reduce or minimize failures

Typical examples of time-based predictive maintenance can be:

Replacement of filters after every six months.
Lubricate bearing after every three months.
Visual inspection of the conveyor belt each month.
Lubricating pumps every other week.
Replacing the RO filters each year.

Typical examples of usage-based predictive maintenance can be:

Maintaining equipment after producing 100 products.
Scheduling maintenance or servicing after every 60 working hours.

A typical example of failure-finding predictive maintenance is:

Starting the emergency sprinkler system periodically to find if the system is working smoothly to ascertain that it will work during an emergency situation.

A few other preventive maintenance examples could be

A thorough inspection of the vehicle before site visits.
Frequently maintain HVAC systems during summer.

Preventive Maintenance Plan or Philosophy

The preventive maintenance program is normally based on the following factors as listed below:

Impact of the worst-case scenario
lost production
Likelihood of failure
Cost involvement
Regulatory compliance
Workplace safety

Preventive maintenance is performed when the benefits of the maintenance outweigh the risks and costs. The optimum frequency of the preventive maintenance plan is developed by plotting the maintenance cost vs maintenance frequency curve and finding a balance as shown in Fig. 1

**Fig. 1: Preventive Maintenance Cost vs Frequency**

There are a few steps for an effective preventive maintenance plan:

Finding the end purpose (Reduce downtime or repair cost, Increase production rate or asset availability)
Identifying and Assessing the critical equipment and finding the cost and impact in case of failure.
Choosing the format for recording preventive maintenance goals (Manual, computerized, or advanced software-based)
Creating the preventive maintenance plan and schedules like assigning personnel, tasks, prioritization, and recording.
Tracking, reviewing, acting, and adjusting.

Advantages of Preventive Maintenance

A number of benefits are received through proper preventive maintenance planning:

Prolonged life of company equipment before failure.
Fewer errors in day-to-day operations
Less unplanned downtime.
Increasing productivity and efficiency
Less unnecessary maintenance and inspections
Reduced risk of injury
Stronger work execution
Improved reliability of equipment
Fewer expensive corrective and emergency repairs
Reduced health, injury, and safety risks
Improving audit and regulatory compliance with extensive documentation
Less Energy Consumption
Optimized maintenance planning and resource allocation
Better margins and profits

Disadvantages of Preventive Maintenance

A few potential disadvantages associated with a Preventive Maintenance schedule could be:

Budget Constraints (High start-up and implementation costs)
Time-Consuming
The requirement for Additional Resources (spare parts, staff, etc.)
Organizational Difficulties
Requires planning

Applications of Preventive Maintenance philosophy

Preventive maintenance programs can be applied in all types of industries including:

Oil/Gas/Utilities
Chemical/Petrochemical
Power Plants
Metal/Manufacturing Industries
Country Clubs
Restaurants
Fleet Management
Property Management
Facility Management
Schools
Governments
Hotels, Hospitality & Restaurant Industry

CMMS Software:

For complex assets, it’s nearly impossible to record data and perform preventive maintenance without using the software. They are great tools for efficiently creating and scheduling digital work orders for preventive maintenance. CMMS or computerized maintenance management system is such a widely popular software. This software will automatically assign and alert the scheduled tasks based on the given input.

The main advantages of using CMMS over other modes of preventive maintenance programs are:

CMMS quickly sets up preventive maintenance schedules for any asset based on time or usage.
Track and manage all preventive maintenance work with an easy-to-use maintenance calendar.
Create PM checklists and attach them to the work orders.
Automate the administrative part of maintenance by sharing electronic work orders and letting the CMMS automatically log performed work.
Get instant access to all maintenance data which technicians can access via mobile devices even when out in the field.
Improve control over the spare parts inventory through automatic parts usage tracking and low in-stock notifications.
Keep a close eye on the preventative maintenance program by tracking important metrics and KPIs.

Reactive Maintenance vs Preventive Maintenance

The main differences between Reactive maintenance and preventive maintenance are listed in the table below:

Reactive Maintenance	Preventive Maintenance
Reactive maintenance provides the maximum utilization and production value from the equipment or asset.	Preventive maintenance calls for Lower equipment utilization
In reactive maintenance, the maintenance cost is higher after failure.	The maintenance cost is comparatively lower in preventive maintenance.
More unplanned downtime	Less Unplanned downtime
Reactive maintenance is Crisis based approach	Preventive maintenance is a preparation-based approach
Chaotic execution of work responsibilities	Organized execution of work responsibilities
Frequent failures	Longer life expectancy
Heavily people-dependent due to increased labor costs	Utilizes facility management software (FMS)
Reduced efficiency of the equipment	Efficient productivity

Reactive Maintenance vs Preventive Maintenance

Plant Maintenance Online Courses

To upgrade your knowledge about the aspects of plant maintenance, the following online courses can be referred to:

What is a Project Manager? | Roles of a Project Manager

Written by Anup Kumar Dey in Piping Interface,Project Management

What is a Project Manager?

A project manager is a person who is responsible for the successful initiation, planning, design, execution, monitoring, controlling, and closure of a project. He is the overall leader and leads his team to ensure successful project completion within the scheduled time and budget. In every project, a project manager is a respected position and is held by key personnel of an organization. Depending on the type of industry, the role of a project manager may vary slightly but their main mission is to reduce project cost, maximize the efficiency of team members and increase company profits. From the start of the project till its completion, project managers are accountable for the success or failure of the project. The term “project manager” is widely used in information technology, construction, chemical, petrochemical, architecture, and oil & gas industries. Good project managers possess excellent entrepreneurial capabilities with various skill sets. In this article, we will explore the role of a project manager in detail.

Role of a Project Manager

A project manager runs the project on a day-to-day basis. He leads and manages the project team. They are persons with strong critical-thinking abilities and possess wonderful communication skills to solve problems as and when they arise. Project managers are well-informed about the project and always motivated. The role of a good project manager can be described as follows:

Proper Planning of Project Activities:

A project manager defines the project scope and strategically plans all project activities to prepare the project schedule. He must foresee the interdependency of each activity and prioritize accordingly. He must understand the resource allocation as per availability.

Organize the project team and encourage the members to perform their best:

A good project manager always keeps an eye on the project schedule and through his project team solves any major issues with disciplines in case of any deviation from the schedule. He encourages his team to solve any obstacle to meeting the commitments and brings the full potential of members. He never blames his teammates and establishes a perfect example of teamwork, understanding, and effectiveness.

Time Management:

A good project manager must be good at negotiating achievable deadlines and must interact the same with team members.

Deliverable Management:

Every project has a number of deliverables. Project managers must keep track that all deliverables are delivered within the agreed timeframe and budget.

Monitoring Project Progress:

In current times, money is normally related to progress. So, it is the project manager’s responsibility to monitor the progress through various tools and techniques and status reports. He must intervene in cases if progress is not as per planning.

Regular Meetings with Client, Project Team, and Discipline members:

Project managers must schedule regular meetings to understand what is going well and what is not. It will ensure the smooth working and progress of the project. Regular client meetings and meeting their expectations will build up good relationships with the client which will ensure more project wins from the same client in the future.

Managing Changes and Deviations:

A good project manager must track all the scope deviations and track those to discuss with the client regarding cost and schedule impact.

Execution:

The project manager should always be part of the successful execution of each project stage. He must understand each project phase through frequent, open communication with the project team members, discipline leads, and stakeholders.

Ensuring customer satisfaction:

Project managers must minimize uncertainty to avoid any unwanted surprises and involve stakeholders/clients as frequently as possible. Maintaining effective communication about project updates is always preferable.

Analyzing and managing project risk:

Good Project managers must meticulously identify the potential risks and evaluate those prior to the actual stage to reduce the impact.

Closing the project and ensuring Quality:

An ideal project manager must ensure all deliverables are following the quality system to ensure reduced rework at a later stage; It will increase the profitability of the company.

Skills of a Project Manager

A good project manager must have the following skills to work efficiently:

Proven Work Experience
Project Management
Developing and Tracking Budgets
Financial Analysis
Solid Organization Skills
Efficient Planning
Coaching
Supervision
Problem-Solving Skill
Staffing
Process Improvement
Decision making
Planning
Performance Management
Inventory Control
Excellent Communication Skill
Resource Management
Leadership Skill
Creative mindset
Analytical Skills

How to become a Project Manager?

If you are reading till this point means you are wondering about “How to become a project manager”. If you don’t have that huge experience and skills then you can follow the below-mentioned steps to fulfill your dream of becoming a project manager.

Decide to become a project manager
Find out the proper certification you wish to pursue. For example, you can opt for PMP certification by PMI. Click here to know more about PMP certification preparation steps.
Start your project management education
Prepare yourself for the certification
Maintain your certification through continuous learning, working, and improvement.

Wish to know more. Then click here and attend any of the online courses.

What is a Deluge Valve? | Types and Working of Deluge Valves

Written by Anup Kumar Dey in Engineering Materials,Health & Safety,Mechanical,Piping Design Basics,Piping Interface

A deluge valve is a critical component of the deluge system used in fire protection services. During fire events, deluge valves are activated quickly and deliver a large volume of water over the protected area to extinguish the fire for protecting life and property. Because of this, deluge valves are known as the heart of a deluge system. They are activated by a detection system and operate as a system control valve. A deluge valve consists of an inlet, outlet, and a priming chamber. They can work in both vertical and horizontal installations. Deluge valves are widely used in Oil & gas industries, power plants, tank farms, foam systems, paper industries, car industries, petrochemical onshore and offshore installations, etc. Viking and Tyco are the industry leaders in manufacturing deluge valves. Fig. 1 below shows an image of a typical deluge valve.

Working of a Deluge Valve

The deluge valve is a quick-acting, hydraulically operated diaphragm valve consisting of three chambers (Refer to Fig. 2), isolated from each other by the diaphragm-operated clapper and seat seal.
Pressurized water is supplied to the priming chamber through an external bypass check valve and restriction orifice system during set position. The pressure of the water trapped in the priming chamber holds the diaphragm on the valve seat, keeping the valve closed.

Upon detection of fire, the pressure from the control chamber is released by a manual or automatic release device. So, the top chamber pressure of the deluge valve falls below the supply pressure forcing the diaphragm of the seat. Water from the inlet side flows into the piping network and alarm devices.

Deluge Valve Types

Depending on the trim used in a deluge valve they are categorized as follows:

Basic Type
Dry Pilot Trim type
Wet Pilot Trim type
Electric Release Trim type
Test and Alarm Trim with Sprinkler

Basic Trim Type Deluge Valve:

Basic trim is required for all types of deluge valves regardless of the release system. Typical components of a basic trim-type deluge valve are the main drain valve, drip check valve, priming connection, emergency release valve, and pressure gauges.

Dry Pilot Trim Type Deluge Valve:

Dry pilot trim type deluge valves are known as pneumatic release type as it uses a pilot line containing dry air under pressure. The pilot line is connected directly to the top of the Positive Drain Actuator (PDA). The bottom of the PDA is connected to the top chamber of the deluge valve.

Due to the release of any of the release devices on detection of fire, the air pressure drops and the diaphragm of the PDA is lifted allowing the water to drain. This reduces the water pressure in the top chamber of the deluge valve and when the pressure in the top chamber reaches 50% of the supply pressure, the deluge valve opens.

Wet Trim Type Deluge valve:

A wet pilot trim type deluge valve uses a pilot line of closed sprinklers containing pressurized water for its operation. The water is supplied through the upstream side of the deluge valve, through a restricted orifice. All the release lines are connected to a common release line. When any of the release devices are released, the water pressure of the deluge valve top chamber falls to 50% of the supply pressure allowing the supply air to flow.

Electric Release Trim Type Deluge Valve:

As the name indicates, such type of deluge valve is actuated electrically. To activate an electric trim-type deluge valve, a solenoid valve is provided to drain the water from the valve top chamber. An electric alarm is activated by a pressure switch that shuts down the desired equipment or gives an indication for tripping to the control panel.

Test and Alarm Trim with Sprinkler:

Test and Alarm Trim with Sprinkler: Such trim is supplied along with the sprinkler alarm bell that bells on activation of the deluge valve. To test the normal operation of the sprinkler alarm bell, a test valve is provided.

Depending on the number of priming chambers two types of deluge valves are found.

Single chamber deluge valve and
Double chamber deluge valve

Single-chamber deluge valves are the traditional diaphragm-type valves with an inlet chamber connected to the deluge valve supply side and an outlet chamber connected to the fire suppression system side. Such deluge valves have only one prime chamber. These valves need low maintenance and provide an obstacle-free water path minimizing pressure loss.

Double chamber deluge valve design combines all the functions available on the traditional deluge valves with a fully redundant architecture and it provides higher reliability. Constituting two priming chambers, with their own diaphragm and actuation trim, such valves offer two independent waterways to the water spray system. Each priming chamber provides the nominal design waterway for the fire protection system. If one diaphragm fails, the other diaphragm opens allowing the hydraulic waterway for the correct operation of the water spray system.

Materials for Deluge Valve

A variety of different materials are used to produce a deluge valve depending on the requirement. Common deluge valve materials are

Cast Steel
Stainless Steel
Cast Iron
DSS
SDSS
Hastelloy
Titanium
Nickel-Aluminum-Bronze, etc.

Advantages and Disadvantages of a Deluge valve

The deluge valve provides the following advantages:

Quick response.
A large quantity of water is available in a shorter time period.
Low cost
Designed to be reset without opening the valve
Possibility of inline maintenance.
Obstacle-free, full bore

The main drawbacks of a deluge valve are:

It can damage sensitive or electronic equipment.
Longer cleaning time than dust and gas systems.
It requires a large water reservoir for its operation.

Click here to know about: Deluge System: Definition, Working, Applications, and Advantages

AutoPIPE vs CAESAR II: Differences between CAESAR II & AUTOPIPE

Written by Anu Sharma in Caesar II,Piping Stress Analysis,Piping Stress Basics

What is Autopipe?

Autopipe is a computer-based engineering program to determine pipe stresses, pipe support design, flange analysis, and equipment nozzle load analysis under dynamic and static load conditions. Autopipe incorporates piping codes such as ASME, British standard, European, NEMA, ASCE, API, and WRC guidelines that are useful in providing a comprehensive analysis of a piping system in addition to 30 piping codes. Autopipe has three editions namely Standard, Nuclear and Advanced. The advanced version provides advanced analysis which is not available in the standard version of Autopipe. Whereas on the other hand, the nuclear version includes all the advanced features, JSME PPC thermal and nuclear transient analysis, and nuclear ASME in classes 1, 2, and 3. Autopipe is well-established software commercially available since 1986. The owner of Autopipe software is Bentley.

What is Caesar II?

Caesar II introduced in 1984 by Intergraph Corporation is the most widely used software for pipe stress analysis. Caesar II allows accurate and quick analysis of piping systems that are subjected to thermal, weight, pressure, seismic, and wind. Caesar II can be used to analyze piping systems of any complexity or any pipe size. It is licensed by almost all the engineering firms of the world. Currently, the software is owned by Hexagon.

AutoPipe vs Caesar II

To find out the differences between AUTOPIPE and CAESAR II we will consider a sample model and study the features of both software. The model shown in Fig. 1 is a pump system where Pump A is Point 1 or Pump B is Point 90 and both Pump A and B are in the operation. Here point 170 is connected to a vessel that is oriented in the Z-axis and at the same point we have entered a flexible anchor defined by CAESAR under the option that shows WRC297 and by AUTOPIPE we have under the option that shows user flexibility.

**Fig. 1: Pump Model in Autopipe and Caesar II**

Preparing Load Cases

Both CAESAR and AUTOPIPE perform the same task by providing the user with the stress analysis results based on the load cases that are applied to a geometric model of a particular piping system. However, there is little fundamental difference between both applications on how to load combinations are combined.

One of the fundamental differences between CAESAR and AutoPIPE is the load sequence versus load vector superposition.

Consider the following example:

L1 W+P1+T1 (OPE) is equivalent to AutoPIPE load case as GRT1P1
L2 W+P1 (SUS) is equivalent to AutoPIPE load case as GR+Max P
L3 L1-L2 (EXP) is equivalent to the AutoPIPE T1 case

AutoPIPE load sequence approach does not require intermediate equations like L3 that is found in CAESAR II. This reduces the complexity of load combinations and the length of the output report. Also, AutoPIPE has more advanced non-linear analysis with load sequencing (without iteration problem) and therefore the users can expect more accurate non-linear results than other programs.

In Caesar II, there is an additional Hanger load Case variable H for using Spring hangers but Autopipe automatically takes care of the same in the calculation.

Changing Global Parameters

Global changes to various parameters like pressures, temperatures, materials, etc can be done in both applications. But there are a few differences between both of them as shown below:

In Caesar II, there is no multiple copy/paste and column sort option. One can modify one cell at a time.

Autopipe is bi-directionally synchronized with the plot, It can make global changes across multiple cells of like data. It can sort any column into logical data groups. Autopipe selects multiple ranges of components with graphical highlights. It has real-time graphical plot updates with multi-level undo and redo. It has customized printing. It behaves like Microsoft Excel, unlike Caesar Like spreadsheet.

**Fig. 2: Changing Global parameters in Autopipe vs Caesar II**

Changing Support Friction

In Caesar, we have to change friction values one by one or can be replaced by find and replace values similar to excel.

In Autopipe, in the support grid, one can double-click click column heading in order to save the data. One can select multiple cells to make changes or can select one complete column and then select one cell by holding the CTRL key. Then we can enter a new value in the first cell and press CTRL+Enter

**Fig. 3: Changing Support Friction in Autopipe vs Caesar II**

Changing Process Parameters in the Model

Caesar II uses a list spreadsheet as shown in Fig. 4

**Fig. 4: Changing Process Parameters in Caesar II**

Autopipe makes global changes to parameters like pressure and temperature.

Other Differences between Autopipe & Caesar II

Other differences between Caesar II and Autopipe are tabulated below:

AutoPIPE	Caesar II
AutoPIPE uses an Alpha-numeric node numbering system.	Caesar II uses only a numeric node numbering system.
In Autopipe, up to 99 levels of Undo and Redo option is available.	In Caesar II, undo and redo option is lost once the input module is exited.
AutoPipe allows users to input up to 100 sets of pressure and temperatures. So for complex systems, one can prepare as many load cases as he wants in a single file.	Caesar II allows only 9 sets of temperature and pressure inputs. So for complex systems where many temperature cases are required one needs to prepare two or more caesar files to simulate all operating load cases.
In Autopipe, within a single interface, all editions of codes are available and one can easily access any code edition with ease.	For Caesar II, the user has to purchase different software versions to work on different code editions.
Autopipe allows users to open more than one Autopipe window with the same license on the same PC.	Caesar II allows only one Caesar II working window.
Autopipe does not allow users to modify friction stiffness value to alter the results.	In Caesar II, modification of friction stiffness value is possible in the configuration setting.
AutoPIPE considers rigid bodies to be 100 times stiffer than the connecting pipe material.	CAESAR II multiplies the pipe wall thickness by 10 to make it rigid, keeping the pipe inside diameter, and the weight of the element unchanged.

Table: AutoPIPE vs Caesar II

Reference:

https://communities.bentley.com/

PMP Certification: Importance and Preparation Steps

Written by Subash Sandar Nagarajan in Project Management

What is PMP Certification?

PMP^® Certification is a Project Management Professional Certification issued by Project Management Institute. There is no doubt that PMP is one of the most valued Certifications in the entire world of Project Management. PMP-certified managers have a certain level of prestige and greater access to jobs with higher salaries. Research conducted on several firms has discovered that companies with PMP-certified project managers are more competitive, productive, and meet their goals within the scheduled time. Several salary survey reveals that “PMP certification holders draw 20-25 percent more salary than their non-certified counterparts”

How do I get inspired for PMP Certification?

When I decided to improve my skills I searched on the Internet and LinkedIn to get the relevant course. After weeks of searching, I came to know about PMP certification. Then I started a deep search about the Project Management and Project Manager’s increments in roles, Salaries, and the respect they get after having the 3 Letters (PMP) behind their names.

I was surprised to know that only 1 Million active PMP Certified Professionals are available in the entire world over the span of 4 decades. I was super shocked to know that only 40,000 and 150,000 active PMPs in India and China respectively. The ratio is 0.006 % which is an almost negligible number (190,000/2.8 Billion). For your Understanding – If you go for an Interview that has 100,000 Competitors from India and China, there is a possibility of having 7 PMPs appearing for the interview. Sounds Great… Right! This is the real scenario by the way. Continue reading this article in which I will share my success story in achieving the PMP global credentials. It looks like so many activities but it is simple indeed.

See the below Image (Fig. 1), It was the daily update of the newsfeed on my LinkedIn from September to December 2020. Several Engineers, Managers utilized the COVID-19 situation to prepare for the PMP Exam and successfully clear it.

I was inspired and motivated by the success of others and also I don’t want to be the guy who is standing in the middle of the below Image. I believe you will not be the one after reading this article. I’m not going to say the same as what all the articles about the PMP explain.

Fig. 1: LinkedIn newsfeed on PMP certification

Stepwise action plan for PMP Certification

Below are the step-by-step actions you have to plan and follow to fulfilling your dream to be PMP certified.

Believe in yourself that you will be PMP after passing the Exam. Explain this to your family members as well. Without their support, it is almost impossible to spend time on preparation. Dedication is the most important investment for this exam.
When you start preparing turn off your expert mode and change to learner mode. In other words, you should not compare what you learn with what you have experienced before. The examination will be from the PMI Point of View only. You should unlearn your experience to understand the concept as per the PMBOK (Project Management Body Of Knowledge) guide.
Make a plan for gaining 35 hours of Education (A mandatory Requirement for the PMP Exam) from PMI-approved trainers. [I took UDEMY COURSE BY JOSEPH PHILLIPS – Less than 10$ on offer- Highly Recommended] (You can Check the PMI Website to Learn about PMP Exam Requirements). There are many other courses on Udemy which can be accessed by clicking here.
Find a mentor who is ready to understand and support you by providing mock test questions, explanations, and doubt-clearing sessions. I was lucky to have a mentor with 100 % dedication. He played a major role in my success.
Prepare an MS Excel Spreadsheet consisting of below
- Study plan with Start and Finish Dates
- Mock Test score
- Weak Knowledge Area
- Expenses for the Course including exam Fees.
Purchase PMBOK Guide Hard Copy to study comfortably. Many persons suggested using Rita Mulcahy’s book as a guide for people having difficulty in reading PMBOK. Don’t go for more than 2 books to avoid misunderstanding.
Check Youtube Videos from PMPwithRay which are very useful for understanding ITTOs (Inputs, Tools & Techniques, Outputs of Processes on all the 10 Knowledge areas). No need to memorize ITTOs, very few or no questions will directly ask about the ITTO’s.
Try purchasing the membership together with the exam schedule. I suggest following to book the exam date as per the below steps.
- Gain 35 Hours of Education
- Submit the Exam application (Will be approved within 5 working days)
- Attend at least 8-10 Full Mock tests (Free Mocks Available Online)
- Analyze the results of the mock tests by categorizing the wrong answers by knowledge area. Carry out the 80/20 Pareto principle (i.e) 80% of your mistake will come from 20% of the knowledge area. If you are able to learn those topics with mock scores of about 75-80 % you are on the safer side.
- Once you gain confidence after attending the mocks, pay for the 1-year membership on PMI Website together with the exam fee (You will get a discount if you have a membership)
- You can fix the exam date and you can write the exam Online from home or through the Pearson Vue Test Center.
Experience on Exam Day:
- The PMP exam is really a difficult exam I ever attended. The exam will have 2 sessions with a break in between.
- PMP certification is designed by project professionals, for project professionals and validates that you are among the best—highly skilled in three major topics PEOPLE, PROCESS, and BUSINESS ENVIRONMENT. So, You cannot ignore some topics during preparation. To Pass the Exam You have to score more than Target on all three Topics.
- You have to be clear on 3 approaches AGILE, WATERFALL & HYBRID. It is to validate that you have the project leadership skills employers seek. So, you will prove yourself.
- The most common problem during the exam is there will be 2-3 choices that look like the right answer in the multiple-choice questions. The only solution is to have a lot of practice. (I answered 5800 Questions during preparation through mock tests)
- The next common problem during the exam is time management. I have heard many people told that they cannot answer all the questions so they failed the exam. I have a very good solution for this. From the beginning of mock tests consider 1 minute for 1 question, so you will finish the exam in 3 hrs’ time. Use the remaining time to review the answers. Hope this will help.
- If you feel you are not sure, mark the question for review and check later. Don’t read the question more than 2 times in the final exam.

That’s it!! It May look difficult but not impossible, you are reading this so you have the hunger to earn PMP certification. You are doing the right thing which many are not even thinking about.

I’m glad to share screenshots of the excel file and PMP Certificate for motivating the PMP Aspirants.

My LinkedIn Profile views were at their peak when I posted that I have passed PMP Exam. I thanked all my family members, my Mentor, and all the people who supported and guided me to get these global credentials.

I passed on Nov 30,2020 and made post on Dec 01,2020.

Finally, I would like to share the words of Mr. Joseph Phillips ” KEEP MOVING FORWARD”, “I BELIEVE YOU CAN DO THIS”.

Please post when you pass the exam after checking these articles.

I want to share a copy of the MS Excel file I prepared for my self-assessment. Who want to have the Full PDF file or Draft of the Original XLS Format, drop me an Email: subashmech2011@gmail.com.

Frequently asked questions about PMP Certification

1. Is PMP better than MBA?

Undoubtedly yes! Because MBA is mostly study-oriented whereas PMP is mostly experience-oriented. That’s why PMP Aspirants should have a minimum of 3 years of Work Experience.

2. If an engineer is not working in the project department, can he attain PMP certification?

Yes. Any Engineering Graduate with 3 years of Experience is eligible to get the PMP Global credentials. Whether you are from IT or from Non-IT (like Construction, Finance, Banking, FMCG, Engineering, or Real Estate) PMP knowledge can be applied. Whenever there are new projects then Project Management will come into play. So earning a PMP is always an added advantage and will enhance your skills.

3. I’m not an engineer, I want to earn PMP. Can I go for it?

Of course Yes. You can go for it. Qualification is to have a high school diploma or an associate’s degree (or global equivalent) with 5 Years of Experience or get a CAPM certification from PMI.

4. I saw advertising from some learning centers that mentioned “You get the PMP Certification within a week”. “You earn PMP without appearing for the exam” Is it possible?

These are the keywords used by frauds, and spammers who are looking for cheating people who want to cheat in the exam. If you come across this kind of advertisement, please don’t believe them, you will lose your money and hope to pass the exam. No Pain, No gain!

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