Wednesday, October 14, 2015

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