Technical Awareness Bulletins

Technical Awareness Bulletins deliver quick answers that save MTI member companies time and money. As a service to both MTI members and the industry, MTI continues to create informative technical bulletins on the industry’s hottest topics, from materials selection and welding to corrosion under insulation and failure analysis, and much more.

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Bulletin #1 REQUEST NOW	Focus on Stress Corrosion Cracking The subject of stress corrosion cracking (SCC) is extensive. The focus of this issue is to discuss, in simple terms, some of the pertinent information.
Bulletin #4 REQUEST NOW	Pickling and Passivation in Stainless Steel Pickling and passivation are chemical treatments applied to remove contaminants and assist in the formation of a continuous passive film.
Bulletin #7 REQUEST NOW	Corrosion Under Insulation Corrosion under insulation (CUI) is the corrosion or corrosion-related cracking that occurs under insulation and/or fireproofing. It is a major problem in all parts of the chemical processing industry.
Bulletin #9 REQUEST NOW	Coated Heat Exchanger Tubes Coated tube bundles could potentially provide considerable savings on maintenance and production.
Bulletin #10 REQUEST NOW	Water Treatment - Closed Cooling Systems A closed cooling water system is one in which there is no make-up after the initial charge and no blowdown. These systems are used primarily when precise control of temperature or water purity is necessary.
Bulletin #11 REQUEST NOW	Alloying Elements in Stainless Steel Stainless steel is iron alloyed to chromium with certain elements to give the finished metal required properties. Cost is minimized by controlling the percentages of alloying elements yet maintaining required properties.
Bulletin #14 REQUEST NOW	Metal Specifications In today’s chemical companies, emphasis on process safety management is crucial. It is necessary to avoid getting less than the desired material on a requirement. When there are 20 or more alloys associated with one trade name, getting material fully specified can prevent failures.
Bulletin #22 REQUEST NOW	Storage and Handling of Molten Sulfur Many chemical process plants produce elemental sulfur from the collection of waste gases containing sulfur. The sulfur is generally stored in its molten state so that it can be more readily shipped to buyers. This can come with its own corrosion problems, as explained in the bulletin.
Bulletin #23 REQUEST NOW	Positive Materials Identification PMI (Positive Materials Identification) is the identification or analysis of metal alloys through nondestructive methods. PMI programs are usually based on assessment of the consequences of failure from material mix-ups.
Bulletin #25 REQUEST NOW	Heat Transfer Fluids The heat transfer fluids discussed in this bulletin are organic compounds, typically aromatics, alkylated aromatics, and some high molecular weight glycols. The differences among these compounds account for the differences in their range of applicability and the potential problems that can take place when using these fluids.
Bulletin #27 REQUEST NOW	Polythionic Acid Stress Corrosion Cracking Polythionic acids are a concern for refineries and petrochemical plants due to the extremely rapid intergranular stress corrosion cracking that can occur in equipment during shutdowns, startups or during operation when air and moisture are present.
Bulletin #36 REQUEST NOW	PTFE Expansion Joint For most of the components in use in chemical plants, such as vessels, columns, piping, valves, seals, hoses, and expansion joints, industry Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) concerning life cycle and integrity issues exist. Expansion joints, also called compensators or bellows, normally compress rather than expand and provide the necessary stress relief from thermal and mechanical forces, such as movements and vibrations during normal operations.
Bulletin #37 REQUEST NOW	Venting of PTFE Lined Pipe and Equipment Studies have shown that PTFE vent coupling inserts help in channeling corrosive permeants away from the steel housing. They also help to avoid vent holes from plugging by corrosion products and by painting.