A wealth of experience in manufacturing at Nas Toa
The company Nas Toa Co. Ltd., a member of the Nippon Yakin Kogyo group, has considerable experience in the manufacture of welded stainless steel and high-performance alloyed pipes and tubes. Here they share some of the technical knowledge they have gained in perfecting these products.
Experience from the field…
Since 1998 leaks have repeatedly been detected in 304L stainless steel bellows in a ‘contaminated’ process steam system at one of the chemical plants on the Chemelot Site. Investigations revealed that while the outside of the bellows were corrosion-free the inside exhibited severe corrosion. The challenge: to determine whether the corrosion was due to design of the bellow or the operating conditions.
Metallurgical selection for piping in the process industry
Many industrial accepted standards for pressure design address all aspects of piping design for
chemical plants and refineries; none discuss all of the considerations for metallurgical selection. These code standards do list materials that are acceptable for use in chemical plants and refineries.This paper discusses some but not all of the resources that a designer can reference in properly selecting materials for an application.
Burgundian beer: Brasserie de Vézelay
The Burgundy in France is better known for its wine than for its beer. The slopes leading up to the medieval hilltop city of Vézelay are clad with vines, and the area provides many opportunities for wine-tasting. However, there is plenty of room for brewers offering pure organic beer, which is why Marc Neyret set up his Brasserie de Vézelay in the village of Saint Père, near Vézelay.
New ‘smart-metal’ for earthquake-resistant structures
Super-elastic alloys and bendable concrete composites have been used for a first-in-the-world application in downtown Seattle, USA.
Sea change: as costs subside, the world relies more on desalination to quench its...
In the last few years the world has been increasingly relying on desalination for its drinking and industrial water. The stick is the danger that any already critical water shortage caused by drought and global warming will get worse. The carrot is the provision of more water in parched areas thanks to significant progress towards making desalination more cost-effective and environmentally friendly.
Weld purging for tubes and pipes
High quality welds in pipes and tubes can only be assured if the weld underbead is protected from oxidation. The various techniques available through which protection can be given are referred to as purging.
Stainless icons: St Louis Arch
In 1947 Eero Saarinen, the Finnish-American architect, won $22,500 for submitting a design for a monument to honor Lewis and Clark. The famous explorers passed through St. Louis in 1806 after a three-year expedition that explored Thomas Jefferson’s purchase of Louisiana from Spain. Saarinen said he wanted to “build an arch that would stand for a thousand years”.
Stainless steels in high pressure synthesis sections of urea plants
In order to achieve an acceptable lifetime in High Pressure (HP) Urea Equipment, one must select materials – such as special stainless steel grades - to resist carbamate corrosion. The process conditions are highly corrosive and the corrosion mechanisms are complex. The development of suitable alloys has concentrated on refining existing grades by continuous improvement.
Who was Bill Krivsky?
You may not be familiar with the name of William A. Krivsky (1927-2006), however he should be among those emblazoned in the Stainless Steel Hall of Fame. The following story tells why.