Why Stainless Steel Rust / Corrosion? – Part 1 – Pitting Corrosion!
Although stainless steel is much more resistant to corrosion than ordinary carbon or alloy steels, sometime we see rust on Stainless steel. It is ‘stain-less’ not ‘stain impossible’. Sometime we see rust on Stainless steel. It means it can corrode. Why??? It has some common forms of corrosion in Stainless steel: Pitting corrosion: (pitting corrosion of stainless steel in a chloride-containing environment) Pitting corrosion is an electrochemical oxidation-reduction (redox) process, which occurs within localized holes (cells) on the surface of metals coated with a passive film. The passive layer on stainless steel can be attacked by certain chemical species. The chloride ion Cl- is the most … Continue reading Why Stainless Steel Rust / Corrosion? – Part 1 – Pitting Corrosion!
Stainless steel material: what difference between stainless steel and carbon steel?
Selecting an appropriate type of steel for a project is one of the most important decisions to make. However, before deciding between individual grades, you first have to decide what type of steel to use, such as carbon steel or stainless steel. In general, steel is an alloy with Iron being the main element. An alloy is a material made of a mixture of metals or a metal with other elements. These types of alloys are often cheaper and have improved properties. In the case of steel, iron is primarily mixed with carbon and few other elements. Mixing with carbon makes steel stronger, … Continue reading Stainless steel material: what difference between stainless steel and carbon steel?
Stainless Steel Material: How is stainless steel made?
Stainless steel is known for excellent corrosion resistance. It is an integral part of modern life and is used in a range of applications, including heavy industry, architecture, automotive manufacture, surgery and dentistry. Stainless steel is an iron alloy with added elements such as chromium, nickel, silicon, manganese, nitrogen and carbon. The properties of the final alloy can be fine-tuned by altering the amounts of the various elements. Now we will know How Stainless steel is made? Raw materials: Stainless steel is the most recycled material in the world and it is estimated that 82% of the stainless steel in use today will be recycled … Continue reading Stainless Steel Material: How is stainless steel made?
HULL SURVEY – GOOD BROUGHT IN
In the most rule requirements, the presence of the surveyor is required at times when materials or parts manufactured at places other than the shipyard are being installed aboard the ship concerned. The general conceptual flow of the acceptance inspection process is shown as below: Inspection Procedures Presentation of list Before the start of construction of the ship, a request should be made to the shipyard to submit a list of hull assembly units, equipment and materials which are brought-in or manufactured by a sub-contractor and intended to be used in the ship. These must be subjected to an acceptance … Continue reading HULL SURVEY – GOOD BROUGHT IN
HULL SURVEY – BUILDING PROCEDURE
There are two main types of building procedures. One is the frame erection system which was prevalent before 1950 and the other is the block assembling system adopted by almost all shipyards today. In this guidance, the building procedure employed is assumed to be the block assembling system. Frame erecting system This is an old practice adopted for wooden ships in many years ago and continuously adopted for iron and steel ships of riveted construction in the 19th Century. Even now, some small shipyards continue to use this method. Block assembling system During the World War II, the construction of … Continue reading HULL SURVEY – BUILDING PROCEDURE
Propeller System: Bolt Tightening for Propeller Blade!
We will talk about How to tight for bolts of blades after assembly! Have some method to do it. But in this topic we will say a simple way to do it & not need modern equipment or tools to do. We will use chain locker! We will take an example for easy understand! 1.Mounting propeller blades: Blades marked according to above figure , Aft view. Mounting sequence: 1-3-2-4. 2. Bolt tightening for blade: – Both pre-tighten and final tighten of the blade bolts with can be done by using socket adapter and ring spanner (a chain block suspended wrench) … Continue reading Propeller System: Bolt Tightening for Propeller Blade!
HULL SURVEY – GENERAL
The purpose of this article series are guidance describing the general instructions for classification surveys during construction relating to hull construction and does not include those survey items concerning SOLAS Convention matters such as life saving, fire-fighting, etc. In general of view, i’m giving you the first glance for scopes of a surveyor: Responsibility for Quality Assurance “ The workmanship is to be of the best quality. During construction, the builder is to supervise and inspect in detail every job performed in shed (workshop) and yard (field) as well. ” This means that the first responsibility for quality assurance of … Continue reading HULL SURVEY – GENERAL
Stainless Steel Material: what is stainless steel?
For this topic, we will have a seri about this material type: Stainless steel material. 1. What is Stainless Steel? 2. Corrosion Mechanisms 3. Environmental Factors That Influence Corrosion in Water 4. Construction and Fabrication Influences on Stainless Steel Corrosion 5. Material Handling After Fabrication and During Installation / Stock Materials and Fabrication of Stainless Steel Parts 6. CORROSION RESISTANCE TESTING METHODS 7. UTILITY AND FABRICATOR EXPERIENCES WITH STAINLESS STEEL CORROSION 8. GUIDELINES FOR STAINLESS STEEL USE 9. Other… Okay! Now we start. Are you ready? I. What is Stainless Steel? A metallic alloy (i.e., metal made of multiple elements such as chromium, … Continue reading Stainless Steel Material: what is stainless steel?
Pressure Vessel RBI – intro
RISK-BASED INSPECTION Risk-Based Inspection (RBI) ensures you are performing the right inspections (procedure), on the right assets, in the right areas, at the right frequency. With thousands of assets to monitor, it can be challenging to properly prioritize inspection investments in efforts to reduce loss of containment risks to acceptable levels. Whether dealing with pressure vessels, pressure relief devices, piping segments, pipelines, check valves, or pump casings, loss of containment risks should be identified and mitigated before they happen. Risk-Based Inspection (RBI) can help these risks be proactively mitigated. RBI is an approach used to assign risk to particular assets within … Continue reading Pressure Vessel RBI – intro
AMARINE 