The document discusses preservation and prevention of corrosion. It provides information on different types of corrosion including uniform corrosion, pitting corrosion, crevice corrosion, and intergranular corrosion. It also discusses factors that affect the deterioration of pipe coatings during long-term storage and measures that can be taken to mitigate coating damage and end disbondment. These include selecting coatings that absorb less moisture and are more resistant to UV/heat, improving coating application processes, and developing effective temporary preservation methods for coated pipes in storage.
Performance Characteristics of various Corrugated Roofing Sheets in Nigeriaijceronline
This Paper is based on an experiment carried out on different roofing sheets namely aluminum, galvanized steel, plastic and asbestos of various grades. The aluminum samples were obtained from two different companies in Nigeria namely First Aluminum and Tower Aluminum; the Asbestos was obtained from Emenite while the Steel and Plastic samples were bought from the market. The samples were cut into a particular size (8cm by 5cm) and immersed in various media namely acidic (H2SO4), alkaline (NaOH), Sea water and Rain water in 2litres plastic beakers. The Rain water was used as the control medium for the experiment. The experiment was carried out for 70days and each grade was cut into 14 pieces of the same dimension. The samples were washed, weighed and tagged before immersion in the media. Each sample was removed every 5 days, washed thoroughly, dried and re-weighed. Some of the samples corroded while some resisted corrosion. The differences in the weights of the samples, and hence their respective rates of corrosion were obtained depending on the reacting media. The values that were obtained, the weight loss and weight gain were used to determine the corrosion rates per unit area per unit time. Graphs of specific weight loss/gain against time were plotted for each medium and each sample. Based on our graphs and observations, we can say that the coated samples are more resistant to corrosion, and therefore more durable.
Design, Management and Key Success Factors of an Offshore Cathodic Protection...Dr. Amarjeet Singh
Corrosion is a very prevalent issue for offshore
operations in the oil and gas industry. If the corrosion issues
are not addressed adequately, these may lead to quality
failures, safety incidents, compromise to asset integrity and
high inspection costs. This research paper discusses and
analyzes corrosion types, corrosion threats, mechanisms to
protect against corrosion, design and management of cathodic
protection system, and key success factors for a cathodic
protection system for an offshore oil and gas production
system.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Performance Characteristics of various Corrugated Roofing Sheets in Nigeriaijceronline
This Paper is based on an experiment carried out on different roofing sheets namely aluminum, galvanized steel, plastic and asbestos of various grades. The aluminum samples were obtained from two different companies in Nigeria namely First Aluminum and Tower Aluminum; the Asbestos was obtained from Emenite while the Steel and Plastic samples were bought from the market. The samples were cut into a particular size (8cm by 5cm) and immersed in various media namely acidic (H2SO4), alkaline (NaOH), Sea water and Rain water in 2litres plastic beakers. The Rain water was used as the control medium for the experiment. The experiment was carried out for 70days and each grade was cut into 14 pieces of the same dimension. The samples were washed, weighed and tagged before immersion in the media. Each sample was removed every 5 days, washed thoroughly, dried and re-weighed. Some of the samples corroded while some resisted corrosion. The differences in the weights of the samples, and hence their respective rates of corrosion were obtained depending on the reacting media. The values that were obtained, the weight loss and weight gain were used to determine the corrosion rates per unit area per unit time. Graphs of specific weight loss/gain against time were plotted for each medium and each sample. Based on our graphs and observations, we can say that the coated samples are more resistant to corrosion, and therefore more durable.
Design, Management and Key Success Factors of an Offshore Cathodic Protection...Dr. Amarjeet Singh
Corrosion is a very prevalent issue for offshore
operations in the oil and gas industry. If the corrosion issues
are not addressed adequately, these may lead to quality
failures, safety incidents, compromise to asset integrity and
high inspection costs. This research paper discusses and
analyzes corrosion types, corrosion threats, mechanisms to
protect against corrosion, design and management of cathodic
protection system, and key success factors for a cathodic
protection system for an offshore oil and gas production
system.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
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About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
CW RADAR, FMCW RADAR, FMCW ALTIMETER, AND THEIR PARAMETERSveerababupersonal22
It consists of cw radar and fmcw radar ,range measurement,if amplifier and fmcw altimeterThe CW radar operates using continuous wave transmission, while the FMCW radar employs frequency-modulated continuous wave technology. Range measurement is a crucial aspect of radar systems, providing information about the distance to a target. The IF amplifier plays a key role in signal processing, amplifying intermediate frequency signals for further analysis. The FMCW altimeter utilizes frequency-modulated continuous wave technology to accurately measure altitude above a reference point.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
2. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 2
The act, process, or result of preserving something: such as the activity or process of keeping something valued alive,
intact, or free from damage or decay.
Preservation is the act of maintaining, protecting or keeping something in existence.
Preservation assists in keeping information accessible and useful over time. Conservation treatments help to ensure the
longevity of objects that have value for their content, so information can be learned from them as artifacts. [1]
Any thing which is affected by its environment and surrounding must be protected to extend its lifetime such as, food
products, chemicals, metals , machines etc.
3. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 3
As more and more new oil and gas reserves are developed in more challenging and remote locations, increased
transportation difficulties and thus increased long-distance pipeline constructions have been seen. Large pipe volumes
are often required on a single pipeline project, and thus pipe coating activities may take place several months or even
years before the coated pipes are loaded out for installation. Storage of coated pipes for an extended period, especially in
the tropical environment, can lead to deterioration of pipe ends and coatings, undercutting (or corrosion creep) of
external anticorrosion and/or flow assurance coatings, and rust formation of pipe ends due to accumulation of moisture,
dust and debris on external and internal surfaces. Moisture and rust weakens the bonding of the anti-corrosion base layer,
often being fusion bonded epoxy (FBE), to the steel substrate. Over time, disbandment can occur, particularly at the
cutback of thick three layer and multi-layer polyolefin coating or insulation systems due to high residual stress [2]
4. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 4
Several factors will affect the deterioration of pipe ends and end disbandment of pipe coatings during long term storage:
Type of coating and adhesive: Properties of different types of coating components affect their ability to withstand deterioration and end
disbandment, including moisture absorption, density, hardness and elasticity, tensile strength, coefficient of thermal expansion, stress relaxation,
thermos oxidation/UV and heat ageing resistance, etc.
Thickness and cutback configuration of the mainline coating: At pipe coating cutbacks, stress concentration is related to coating thickness
and cutback angle. The higher the pipe coating thickness and more acute cutback angle, the higher the residual stress concentration2 . As moisture and
rust weakens the bonding strength of the base coating layer to the steel substrate, over time the coating will disbound at the cutback once the resultant
shrinking force from the stress concentration exceeds the adhesive force of the coating-steel interface.
5. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 5
Quality of the factory applied coating: End disbandment of a pipe coating can be a result of already poor adhesion due to
improper surface preparation or improper decontamination in the plant coating process, improper application resulting in too high
interface porosity, coating formulation with too easy to absorb moisture, too low application temperature for the FBE, etc. Aside
from selection of the coating material which may be specifically required by the client, the other factors are the applicator's
responsibility.
Storage conditions of coated pipes prior to pipeline installation: Water absorption and rust formation can occur with coated
pipes stored for several weeks or longer periods prior to construction, particularly at a hot, high humidity and salty environment (i.e.
tropical and marine).
6. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 6
Corrective and preventative measures can be taken in order to mitigate the deterioration of pipe ends and end disbandment of pipe coatings.
These measures include:
o Design and select a pipe coating system which can be thinner, less absorbent to moisture, more UV and thermal stable, and is less or not
constrained by the shrinkage-stress factor.
o Select pipe coaters who have better demonstrated process capability and track records to produce high quality pipe coatings and to deliver
an effective preservation program for long term pipe storage.
o Review and improve related coating application processes for the selected coating system: for examples, to tighten up surface preparation
and application temperature control in order to enhance the adhesive strength of the coating to the substrate, to apply multiple layers for
thick coating systems in order to reduce stress build-up, and to make correct cutback configuration and FBE toe in order to
reduce/minimize the stress concentration.
o Brushing back the disbanded coating until sound and tightly adhered coating, and then apply a suitable field joint coating or temporary
protective system prior to pipe installation.
o Develop and implement an effective temporary preservation method and program, in order to protect the pipe end cutback and the pipe
coating during long term storage.[2]
7. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 7
Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the
gradual destruction of materials by chemical or electrochemical reaction with their environment. Corrosion
engineering is the field dedicated to controlling and preventing corrosion.[3]
Corrosion is the deterioration of a material as a result of its interaction with its surroundings and can
occur at any point or at any time during petroleum and natural gas processing. Although this definition is
applicable to any type of material, it is typically reserved for metallic alloys.[4]
8. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 8
It is generally accepted that ten unique types of corrosion exist. Unfortunately, identification of a specific type
of corrosion mechanism often occurs only in forensic analysis after a component fails.
Design considerations must account for corrosion using corrosion resistant materials, or by increasing the bulk of a
material with a known corrosion characteristic to account for loss during its service life.
Actuarial science and economics govern this choice in the design phase, but corrosion failures often arise in service
operations not anticipated in the design phase.
There are numerous remedies in existence to counteract specific corrosion mechanisms and increase the service life
of specific components.[5]
Corrosion is primarily an electrochemical process. Michael Faraday established this principle in the early nineteenth
century, and it is still fundamental to an understanding of the problem and to corrosion prevention.
9. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 9
As corrosion most often occurs in aqueous environments, we now explore the different types of degradation a metal can experience in such conditions:
UNIFORM CORROSION
Uniform corrosion is considered an even attack across the surface of a material and is the most common type of corrosion. It is also the most benign as the extent of the attack is
relatively easily judged, and the resulting impact on material performance is fairly easily evaluated due to an ability to consistently reproduce and test the phenomenon. This
type of corrosion typically occurs over relatively large areas of a material’s surface.
PITTING CORROSION
Pitting is one of the most destructive types of corrosion, as it can be hard to predict, detect and characterize. Pitting is a localized form of corrosion, in which either a local
anodic point, or more commonly a cathodic point, forms a small corrosion cell with the surrounding normal surface. Once a pit has initiated, it grows into a “hole” or “cavity”
that takes on one of a variety of different shapes. Pits typically penetrate from the surface downward in a vertical direction. Pitting corrosion can be caused by a local break or
damage to the protective oxide film or a protective coating; it can also be caused by non-uniformities in the metal structure itself. Pitting is dangerous because it can lead to
failure of the structure with a relatively low overall loss of metal
10. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 10
CREVICE CORROSION
Crevice corrosion is also a localized form of corrosion and usually results from a stagnant microenvironment in which there is a difference in the concentration of ions between two
areas of a metal. Crevice corrosion occurs in shielded areas such as those under washers, bolt heads, gaskets, etc. where oxygen is restricted. These smaller areas allow for a corrosive
agent to enter but do not allow enough circulation within, depleting the oxygen content, which prevents re-passivation. As a stagnant solution builds, pH shifts away from neutral.
This growing imbalance between the crevice (microenvironment) and the external surface (bulk environment) contributes to higher rates of corrosion. Crevice corrosion can often
occur at lower temperatures than pitting. Proper joint design helps to minimize crevice corrosion.
INTERGRANULAR CORROSION
An examination of the microstructure of a metal reveals the grains that form during solidification of the alloy, as well as the grain boundaries between them. Intergranular corrosion
can be caused by impurities present at these grain boundaries or by the depletion or enrichment of an alloying element at the grain boundaries. Intergranular corrosion occurs along or
adjacent to these grains, seriously affecting the mechanical properties of the metal while the bulk of the metal remain intact.
An example of intergranular corrosion is carbide precipitation, a chemical reaction that can occur when a metal is subjected to very high temperatures (e.g., 800°F - 1650°F) and/or
localized hot work such as welding. In stainless steels, during these reactions, carbon “consumes” the chromium, forming carbides and causing the level of chromium remaining in
the alloy to drop below the 11% needed to sustain the spontaneously-forming passive oxide layer. 304L and 316L are enhanced chemistries of 304 and 316 stainless that contain
lower levels of carbon and would provide the best corrosion resistance to carbide precipitation.
11. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 11
STRESS CORROSION CRACKING (SCC)
Stress corrosion cracking (SCC) is a result of the combination of tensile stress and a corrosive environment, often at elevated temperatures. Stress corrosion may result from
external stress such as actual tensile loads on the metal or expansion/contraction due to rapid temperature changes. It may also result from residual stress imparted during
the manufacturing process such as from cold forming, welding, machining, grinding, etc. In stress corrosion, the majority of the surface usually remains intact; however,
fine cracks appear in the microstructure, making the corrosion hard to detect. The cracks typically have a brittle appearance and form and spread in a direction
perpendicular to the location of the stress. Selecting proper materials for a given environment (including temperature and management of external loads) can mitigate the
potential for catastrophic failure due to SCC.
GALVANIC CORROSION
Galvanic corrosion is the degradation of one metal near a joint or juncture that occurs when two electrochemically dissimilar metals are in electrical contact in an
electrolytic environment; for example, when copper is in contact with steel in a saltwater environment. However, even when these three conditions are satisfied, there are
many other factors that affect the potential for, and the amount of, corrosion, such as temperature and surface finish of the metals. Large engineered systems employing
many types of metal in their construction, including various fastener types and materials, are susceptible to galvanic corrosion if care is not exercised during the design
phase. Choosing metals that are as close together as practicable on the galvanic series helps reduce the risk of galvanic corrosion.
12. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 12
CONCLUSION
In aqueous environments, metals may be exposed to not only uniform corrosion, but also to various types of local corrosion
including pitting, crevice, intergranular, stress, and galvanic corrosion. In areas where corrosion is a concern, stainless steel
products offer value and protection against these threats. Stainless’ favorable chemical composition makes it resistant to
common corrosives while remaining significantly more affordable than specialty alloys such as titanium and Inconel® alloys.
Stainless steel is a highly alloyed, low-carbon steel with a high (at least 11%) chromium content. When exposed to an
oxygenated environment, the chromium reacts to form a passive oxide layer on the metal’s surface, slowing further
and providing a self-healing quality, which helps resist uniform and local corrosion. Nickel helps to stabilize the
increasing SCC resistance. Manganese, in moderate quantities and in association with nickel, will perform many functions
attributable to nickel and helps prevent pitting. The addition of molybdenum (the additional element in Type 316 SS that
increases its performance with respect to Type 304 SS), helps increase resistance to pitting and crevice corrosion. Reduced
levels of carbon, such as those found in 304L and 316L will help prevent intergranular corrosion. Lastly, nitrogen, although
a major element of stainless steel’s composition, increases pitting resistance. Choosing stainless steel can help greatly
the risk of corrosion and yield long-term savings by avoiding the costs associated with reinstallation of inferior products. [6]
13. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 13
What Causes Corrosion?
o The simplest cause of corrosion is contact. That can be when metal comes in contact with all kinds of things,
including water, oxygen, grime, or other metal. Any of these elements can set off the problem, but each kick-
starts corrosion for different reasons.
o Corrosion is a chemical reaction that plagues metals. The problem starts when a piece of metal loses electrons
and is weakened. Those electrons are encouraged to leave when the metal is in contact with an electrolyte, like
water, and electron-greedy materials.
o Suddenly, the metal is vulnerable to other destructive chemical reactions. The result can be things such as rust,
cracks, and holes.
o Unfortunately, there’s more bad news for pipes. Pipe corrosion is also self-perpetuating, which means corrosion
gets worse once it starts. However, there are ways to keep corrosion from creeping into piping or non-piping
surfaces.
14. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 14
Here are five ways to fight off corrosion: [7]
1. For Pipes, Watch Your Water
Water is a major corrosion causer. Especially in copper piping, too low of a pH level can hurt the pipe’s lining. The EPA recommends you make sure
your water’s pH hovers between 6.5 and 8.5.
You’ll also want to monitor the oxygen levels in your water. Oxygen leads to rust, and it can cause buildups and blockages.
Another good idea is to keep water temperatures low when possible. Hotter water tends to be more corrosive.
2. Keep Pipes Clean
Microbiologically induced corrosion (MIC) happens when metals are exposed to corrosive bacteria. It’s smart to clean pipes to prevent MIC, especially
when pipes are in contact with sulfides regularly.
You can use inhibitors or biocides to keep fluids clean. Another option is to consider chemical treatment for water or other liquids.
15. Prepared By: Engr. Syed Ali Raza Naqvi [STE] 15
3. Add Protection to All Metals
Protective linings or special coatings can prevent corrosion in pipes as well as other surfaces. That includes things such as beams, joints, and bolts.
For instance, galvanization works by adding a layer of zinc to metallic surfaces such as steel or iron.
It’s also wise to use a sealant to keep corrosive bacteria from settling into joints or crevices in the first place.
4. Keep Structures Stable
Friction, jiggling, and bouncing wear on metal. When openings start to form, corrosive material sets in, and it can lead to crevice corrosion.
A good way to prevent crevice corrosion is to use a restraint . Things such as U-bolts, straps, and clamps cut down vibrations that can lead to
corrosion.
5. Protect Against Metal-to-Metal Contact
Not all metals get along. Galvanic corrosion happens when one metal pulls electrons from another metal. The result is a weakened section and a
compromised structure.
The best way to protect against metal-to-metal corrosion is to insulate the metal. For piping, consider installing insulators, such as wear pads or Pipe
shoes. Insulators add a buffer between metals, so the metal stays durable longer.