Fansteel Automatic TemperaturePressure Relief Valves A new series of self-closing com bination temperature and pressure relief valves for automatic storagetype water heaters, storage tanks, and booster heaters has been an nounced. Dept. IEC, Cash-Acme, P. 0. Box 191, Decatur, III. 41 Large Scale Ultrasonic Cleaner A 150-gallon capacity ultrasonic cleaner has been added to line of cleaning equipment. Equipment features a cleaning tank, measuring 3 feet square by 21/2 feet deep, which is fitted with an array of 20 bottom-mounted transducers. These are driven by a simplified pulsed electronic generator deliver ing 8000 watts peak power. Dept. IEC, Acoustica Associates, Inc., Dept. 125, 26 Windsor Ave., Mineola, L. Ι., Ν. Υ. 42 Renewable Disk Y Valves Complete line of stainless steel renewable disk Y valves provided with an extra lift to remove the disk from theflowarea is now avail able. Valves are made in 0.5 to 3 inches screwed and socket weld and 0.5 to 8 inches flanged. Dept. IEC, Cooper Alloy Corp., Hillside, N. J. 43
Corrosionomics REGISTERED
U.S.
PATENT
OFFICE
A JOURNAL OF USEFUL INFORMATION FOR THE SOLUTION OF CORROSION PROBLEMS
TANTALUM HEAT EXCHANGER SOLVES HIGH TEMPERATURE HNO3 PROBLEM Commercial Solvent's plant at Sterlington, La., produces flake ammonium nitrate by neutralizing nitric acid with anhydrous ammonia. The reaction takes place at 400-460°F., driving off water introduced with the acid. A key piece of equipment in this operation is a Fansteel tantalum heat exchanger which has been giving outstanding service with no visible corrosion noted over a number of years. Handles HNO3 at 45 Gal/Min This Fansteel equipment handles up to 45 gal/min at elevated tempera tures with a heat transfer coefficient greater than 550 Btu/hr/sq ft/°F. It is made of three 8-ft. sections in series. If one unit must be removed the other two may be coupled and run at re duced flow. Each unit consists of a bundle of 19 straight tantalum tubes, V2" O.D. and with a 0.015" wall. This gives 20 square feet of heat transfer surface for each section.
Corrosion Rate Nil in HNO3 Montecatini, the huge Italian chem ical company in Milan, exposed tan talum to 98% HNO3 containing 0.1% H2SO4, 0.4% nitrogen oxides and 1.5% H2O at 132°C for 762 hours. The corrosion rate was 0.00002 inches per year and the metal was unchanged in appearance. Tests by other com panies confirm the low corrosion rates of HNO3 in all concentrations even at elevated temperatures—as high as 200°C. "U" Tube Bundles Also Available Fansteel heat exchangers are also available with " U " tube bundles where .processing or physical require ments call for a unit with input and output at the same end. No internal gaskets are used, which makes the leakage problem nonexistent. Teflon* grommets support each tube in the baffle holes and permit free move ment, thereby eliminating the differ ential expansion problem. Tantalum A l s o Resistant to Concentrated H2SO4 a n d H3PO4
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Free Tantalum Test Kit A corrosion test kit, available without charge to research technicians, if re quested on your letterhead; contains both tantalum sheet and wire. Free Technical Information
This valve features easy maintenance ore information is as near as your mailbox! Just write to the manufacturer of the item in which you are interested. Use of your company letterhead will ensure speedy reply · · · · · · · · · · · · · ·
Shown without lagging, three-section tantalum heat exchanger raises nitric acid temperature to 330° F. ^Registered trade mark, E. J. duPont deNemours& Co.. Inc.
The above condensation is typi cal of the articles which appear in CORROSIONOMICS. "~ a Fansteel publication. Mail us your name for ; inclusion on our fre< *\H§| mailing list.
For further data on the above, write:
G584A,
FANSTEEL METALLURGICAL C O R P O R A T I O N CHEMICAL
EQUIPMENT
DIVISION
NORTH CHICAGO, ILLINOIS, U.S.A. VOL. 50, NO. 5 • MAY 1958
117 A
