Skip to main content

NACE Standards

NACE International

NACE International formerly known as National Association of Corrosion Engineers, established in 1943 by eleven corrosion engineers from the pipeline industry.

The founding engineers were originally part of the regional group formed in 1930s when the study of cathodic protection was introduced.

Since then NACE International has become the global leader in developing corrosion prevention control standards, certification and education.

NACE has published standards since 1969 and has been accredited by the American National Standards Institute (ANSI), which is the U.S. member of International Standards Organisation (ISO) as a standards developer for many years.  

NACE Standards for Sour Gas Applications

Natural Gas and Crude Oil, as raw materials, contain greater or lesser high levels of Hydrogen Sulfur (H2S). 
If there is a minimum amount of H2S and a minimum amount total pressure, such a mixture is known as "Sour Gas" or "Sour Oil".
NACE Standards describe the corrosion properties of metals in the presence of H2S under different corrosion mechanisms.

NACE MR0175 Standard

The NACE MR0175 standard is represented in the ISO15156 standard (Part 1 - 3) internationally valid. This deals with technical issues regarding corrosion of materials during the extraction and processing of Natural Gas and Crude Oil.

These guidelines are determined from the collection of laboratory experimental data and the field experiences related to cracking resistance of metallic materials in a H2S or Sour environment. 
The MR0175 standard is meant for aggressive area of Oil production, the wellhead and extraction point equipment. This is for the areas where everything is untreated and highest concentration of H2S are found. It is also the highest risk area for corrosion and in particular Sulfide Stress Cracking.

NACE MR0103 Standard

The NACE MR0103 standard defines material requirements for resistance to Sulfide Stress Cracking (SSC) in Sour Refinery process environment i.e. environments that contain wet hydrogen sulfide (H2S).

The term "Wet H2S Cracking" as used in the refining industry covers a range of damage mechanisms that can occur due to effects of hydrogen charging in wet H2S refinery or gas plant process environments.

One of the types of material damages that can occur due to the effects of hydrogen charging is Sulfide Stress Cracking (SSC) of hard weldments and microstructures.

This Standard is intended to be utilized by refineries, equipment manufacturers and construction contractors.
It is intended for main piping, vessels and associated refinery equipment, welding and general refinery construction.

NACE  SP0472 Standard

Popular posts from this blog

The Intuitive Lowest Cost Method

The Intuitive Lowest Cost Method Or The Minimum Cell Cost Method

The Intuitive Lowest Cost Method is a cost based approach to finding an initial solution to a transportation problem.
It makes allocations starting with the lowest shipping costs and moving in ascending order to satisfy the demands and supplies of all sources and destinations.

This straightforward approach uses the following steps.
Identify the cell with the lowest cost.Allocate as many units as possible to that cell without exceeding the supply or demand.Then cross out the row or column or both that is exhausted by the above assignment.Move on to the next lowest cost cell and allocate the remaining units.Repeat the above steps as long as all the demands and supplies are not satisfied. 
When we use the Intuitive Approach to the Bengal Plumbing problem, we obtain the solution as below.

Transportation Matrix for Bengal Plumbing From \ To Warehouse E Warehouse F Warehouse G Factory Capacity Plant A Rs.50
Rs.40 100 Rs.30 100 Plant…

Vogel's Approximation Method (VAM)

The Vogel's Approximation Method

In addition to the North West Corner and Intuitive Lowest Cost Methods for setting an initial solution to transportation problems, we can use another important technique - Vogel's Approximation Method (VAM).
Though VAM is not quite as simple as Northwest Corner approach, but it facilitates a very good initial solution, one that is often the optimal solution.
Vogel's Approximation Method tackles the problem of finding a good initial solution by taking into account the costs associated with each alternative route, which is something that Northwest Corner Rule did not do.

To apply VAM, we must first compute for each row and column the penalty faced if the second best route is selected instead of the least cost route.

To illustrate the same, we will look at the Bengal Plumbing transportation problem.

Transportation Matrix for Bengal Plumbing From \ To Warehouse E Warehouse F Warehouse G Factory Capacity Plant A
Rs.30 100 Plant B


A market in any one of a variety of different systems, institutions, procedures, social relations or infrastructures whereby persons trade, and goods and services are exchanged, forming part of the economy. It is an arrangement that allows buyers and sellers to exchange things. Markets vary in size, range, geographical scale, locations, types and varieties of human communities, as well as in the types of goods and services traded. Some Examples include, local farmer's market held in town squares, Shopping Centres or shopping malls, Financial Markets such as International currencies or commodity markets or Equity stock markets, legally centred markets such as pollution permits, and illegal markets such as black markets for illicit drugs or weapons. In mainstream economics, the concept of market is any structure that allows buyers and sellers to exchange any type of goods, services and information. The exchange of goods or services for money is called a transaction. Thus a market ha…