sábado, 27 de octubre de 2012
Welcome to my new blog!!! =)
My idea is to chat about valves made of exotic alloys.
I'll try to keep my focus on duplex and super duplex valves, highly appropriate for marine and saline applcations. Corrosion resistance is obtained by using Alloy 20 and 904L, whilst monel is great for HF acid. Hastelloy and incoloy resist heat very well, as well as inconel to a lesser extent. On the other hand titanium valves-- which offers high tensile strength and very low density, as well as the more recent titanium substitue tantalum are suited for naval and aviation applications.
Rarer alloys include zirconium and uranus are exotic alloys that are rarely used, but might be useful in high temperature acids. One can expect a long lifetime in saline applications and heat exchangers, although the more sought-after saline application alloy valve is made of aluminium-bronze (NAB or alibronze) with monel K500 disc, shaft and pin. Even rarer alloys are 254 SMO and 6Moly (6 Mo), which combine nickel and copper for varying applications.
As an aside, I'm looking to broaden the discussion to how to source valves from stock, on to get them with really short manufactuing lead times. The range includes nickel-copper alloys and austenitic-ferritic steels.
Valve types and configurations will cover ANSI norms, DIN specifications, NORSOK requirements, JIS standards and GOST and certifications, in all sizes and pressure ratings for gate valves, globe valves, check valves, as well as ball valves. Though of lesser interest, we can talk about butterfly valves, together with plug valves, needle valves and valves that are custom made items too.
But the main issue is the application or medium running through the valves. These specifically include demanding services such as valves for HF Acid (hydrofluoric service) for both Phillips as well as UOP alkylation plants, as well as oxygen service valves that are cleaned, bagged and tagged accordingly. Of particular interest are valves that meet the requirements of other corrosive processes such as sulfuric acid, nitric acid and chlorine. Cryogenic service valves too are within the range of my blog, especially valves that cater to the argon, LPG, LNG and other liquified gas processes, as well as nitrogen and oxygen applications.
Those most interested in such nickel-copper valves are generally EPCs, end users and engineering firms, mainly chemical, plastics and polymers producers, fine chemical manufacturers, petrochemical and gas derivative generators, as well as the operators of nuclear facilities and manufacturers of naval, submarine and marine equipment.
There are quite a few premium suppliers of alloy valves, notably Velan and Kitz.
Please join me by commenting on my blog!