ΕΝ VER
I
THICKENERS
EQUIPMENT
Fight Corrosion With Clad Ti Chicago Bridge & Iron finds that its titanium-clad vessels can withstand stiff abuse • . . f o r a l l wetter a n d w a s t e t r e a t m e n t , w a s h i n g , thickening and clarification operations· #
New simplicity, new efficiency, long, trouble-free service. Simple, rugged, fully-enclosed gear mechanism. Gear sizes through 7 2 " dia. Spiral rakes or rakes to suit operation in tanks up to 150' d i a . Write for Bulletin No. T5-B6. Phone CHerry 4-4466
DENVER Adjustable Stroke DIAPHRAGM PUMPS
. . . f o r handling and metering thickened solids. Stroke can be adjusted while pump is oper ating. Capacity to 1000 g.p.m. Write for Bulletin P8-B12. See our catalog, pages 997-1004 i n CEC.
D Ε
V Ε
E Q U I P M E N T CO. BOX 5268, DENVER 17, COLORADO
MBQM WET-^frOUNP-AND-ŒN^TRIFUGALLY CLASSIFIED— TREATED A N D UNTREATED DRY GROUND A N D AIR FLOATED - BOTH R A Y M O N D A N D TUBE MILL PRODUCTS CRUSHED A N D SCREENED
92
C&EN
OCT.
12,
1959
I T ' S a complete success. That's the way Chicago Bridge & Iron, Chicago, 111., describes die titanium-clad vessel it built early this year for an undisclosed west coast petrochemical company. Calling it "the world's first titanium-clad pressure vessel of commercial size/' GB&I says the unit has stood up well after months of strenuous service. The vessel was designed for use at 150 p.s.i. at 500° R About 4 ft. in diameter by 12 ft. high, it is made from plates of 1 2 -in. mild steel clad with ·"· ,i4-in· and 7 , i4 -in. titanium, grade A40. The top and bottom hemispherical heads are welded from pressed segments, and the fittings and flanges are titanium lined. CB&I sees a promising future for titanium-clad equipment in the chemical, petroleum, paper, and other processing industries. With these units, the user gets the benefit of titanium's high corrosion resistance at much less cost than would be possible if they were made of solid titanium. Before building the large-scale titanium-clad vessel, CB&I constructed an, 18-ineh-high pilot unit which it tested for over a year. In particular, the company had to be sure that the welding technique used to join the individual clad plates would give good results. ί Problems Solved. CB&I says it has worked out methods to prevent the titanium from being contaminated by the steel backing during formation of the clad plate. Contamination could greatly reduce the corrosion resistance of the titanium. The company has also found ways to form the clad sheets in sizes comparable to those of conven tional corrosion-resistant metals. So far, the largest sheets formed have been δ ft. b y 7 ft. Declining to discuss details, CB&I says its cladding process involves use of a metallic powder that acts as a bonding agent. This powder is placed between the titanium sheet and the backing plate and is heated to a temI perature that will liquefy the powder.
Vacuum is applied betxveem the sheet and backing plate to make sure that a good seal is formed. CB&I's fabrication center for tita nium-clad equipment will b e in Birm ingham, Ala. The company says it is now set up to build titanium-clad equipment commercially.
More Analyzers Added Equipment makers a d d six more a n a l y t i c a l instruments to the growing list «ANALYTICAL, instruments continue to come thick a.nd fast from developers* labs. This w^ek, there are s i x more for users to choose from: • Process r-efractometer, from Mine Safety Appliances, Pittsburgh, Pa., for continuous m«asiiremeiit and control of organic and inorganic liqxiids. The unit compares the refractive index of a stream with a standard, is built in modules to f i t it for h i dust rial use. • Portable infrared analyzer, also from Mine Safety Appliances, is de signed for process streams or atmos phere control problems where you do not need extreme sensitivity or selec tivity. The Model 3O0 LI Β A weighs only 30 lb. a n d is more simply designed than MSA's other IR instruments. • Dissolvecd oxygen meter, from Hays Corp., Michigan City, Ind-, automati cally analyzes and continuously records dissolved oxygen in surface waters such as sewage a n d industrial plant effluents, rivers and sti-earns, and reservoirs. The unit is basec3 on Henry's Law—partial pressure of oxygen above a water sur face is proportional t o the amount of oxygen ir> trie water—and detects the oxygen by its paramagnetism. • Suppressed range oxygen analyzer, again from Hays Corp., also uses oxy gen's paramagnetism, gives concentra tion spans from 1 Vr t o 6'/£ when oxy gen content is 30% or less (20% to
