Author: Amarine Antonio

Shipbuilding and welding professional.
AWS CWI, WELDING, Welding Engineer, Welding InspectorLeave a comment

What is different between Partly mechanized and Fully mechanized welding process?

Amarine Antonio

Welding fabrication involves several operations which might have a significant ergonomic impact.This article aimed at providing an overview on these typical activities, and the most confusion on terminology of Partly Mechanized and Fully Mechanized processes during identify the welding personnel as a WELDER or WELDING OPERATOR? The role of welding personnel in welding processes: Based on the level of automation, processes are defined by applicable industrial standards as:– Manual processes, involving welders;– Partly mechanized (or semiautomatic) processes, involving welders;– Fully mechanized (or automatic) processes, involving welding operators;– Automatic and/or robotized processes, involving welding programmers, operators.Depending on the industrial needs, some … Continue reading What is different between Partly mechanized and Fully mechanized welding process?

API 510, API 570 - PI, API Inspector, CORROSION, OIL & GAS, PIPINGLeave a comment

What is water standards for hydrostatic testing?

Amarine Antonio

Selection and Treatment of Water and Conduct of the Test, to Maintain the integrity of the System is a priority concern in new-building or construction project. Specially on Stainless-steel which is very sensitive to corrosion. 1.0 Introduction Welded fabrications are frequently tested hydrotested for pressure tightness. Unless properly conducted, this procedure can induce problems. It is important to avoid initiating corrosion of the fabrication by subjecting it to critical conditions outside the initial design constraints. Where the vessel is to handle materials which are later ingested, contamination must be avoided. Damage may be caused by the induction of latent corrosion … Continue reading What is water standards for hydrostatic testing?

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What is Hot Induction Bends and Inspection guides.

Amarine Antonio

This article outlines the minimum requirements for manufacturing of induction pipe bending according to ASME B31.8, ASME 16.49 and ISO 15590-1. Induction Bending is formed by passing pipe through an induction bending machine. This machine uses an induction coil to heat a narrow band of the pipe material. As the pipe is pushed through the machine, a bend with the desired radius of curvature is produced. The heated material just beyond the induction coil is quenched with a water spray on the outside surface of the pipe. Thermal expansion of the narrowly heated section of pipe is restrained due to … Continue reading What is Hot Induction Bends and Inspection guides.

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Certification of Line-pipe for oil and gas service

Amarine Antonio

This article will guide you about the general specification for steel line pipe and pipeline from the requirements for manufacturing, testing, inspecting, marking, and shipping of steel line pipe for gas and liquid pipelines for offshore applications at purchasing stage or vendor document review process. The following documents are considered part of this specification. Use the edition of each referenced document in effect on the date of the publication of this specification. API SPEC 5L Specification of Line Pipe API RP 5L1 Recommended Practice for Railroad Transportation of Line Pipe API RP 5LW Recommended Practice for Transportation of Line Pipe … Continue reading Certification of Line-pipe for oil and gas service

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What is Shear Stress?

Amarine Antonio

Why are shear stress equations necessary? This article looks at some examples of shear stress equations: average shear stress, beam shear. What are the basics of shear stress? Whenever two materials rub against or slide over each other, there is shear. While normal stress results from the force applied perpendicular to the surface of a material, shear stress occurs when force is applied parallel to the surface of the material. A common example include the cutting of paper with scissors. Shear stress differs across materials and cross-sections, and is measured using a set of formulas called the shear stress equations. … Continue reading What is Shear Stress?

API Inspector, CORROSION, Metallurgy, WELDING2 Comments

Is Stainless Steel ferrous metal?

Amarine Antonio

This question has been made through every year when the engineer concerning about ferrous or non-ferrous metal during making of welding procedure, permanent joint qualification or corrosion calculation. This article gives an overview of ferrous metals, what they are and how they’re made. There are several common types of ferrous metals such as mild steel, stainless steel and cast iron. Ferrous metals are highly versatile. Read this article to learn about their applications and advantages and disadvantages of ferrous metals Did you know? Iron is the most abundant element on earth. The earth’s core consists of an iron-nickel alloy that makes … Continue reading Is Stainless Steel ferrous metal?

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What is Galvanic corrosion between two different materials?

Amarine Antonio

Ever wanted to know more about the Galvanic Series? Read on to find out about what it is and how to use it to analyze the compatibility of joining (fastening) metals. In this article, we’ll look at an example to illustrate the use of the galvanic table. You can also learn more about overcoming potentially compatibility issues between metals. What exactly is the Galvanic Series? The Galvanic Series, also called the electro-potential series, lists metals in the order of their nobility. (Noble metals are those that are resistant to corrosion and oxidation.) When two metals are immersed in an electrolyte, … Continue reading What is Galvanic corrosion between two different materials?