Ultrasonic flaw detector suits production line
maximum installation depth of 1 0 0 m.
Another portable ultrasonic flaw detector has been introduced by Wells Krautkramer. Called the USL 42 ~t comes between the USL 4 8 and USK 7.
A prototype has been tested on the production platform Heather Alfa in the North Sea.
Apphcatlons of USL 4 2 are expected to include on-hne monJtor=ng of volume production components with the facihty for hard copy recording of test data. Special attention is said to have been given to the control layout to make handhng as convenient as possrble for laboratory, workshop or site use. F~ve selectable frequency bands, three narrow and two broad, mean that ~t is poss=ble to inspect anything from attenuat~ve compos=tes, requiring low frequencies, through to thin sectJon high strength alloys requmng good near-surface resolution. The USL 42 is also sa~d to be su=ted to the use of ~mmers~on ultrasonic techniques as ~t has an interface trigger. It is also fitted with a noise suppression facihty for th=ckness measurement Test range is 4 mm to 6 m with a gain of 1 1 0 dB ~n 2 0 dB or 2 dB
Kockums AB, Box 832, S-201 80 Malrno, Sweden
Thickness meter has automatic zeroing Wells Krautkramers USL 42 flaw detector steps, The instrument measures 133 x 2 5 4 x 3 0 5 mm and weighs 8.4 kg.
Wells Krautkramer, Blackhorse Road, Letchworth SG6 I HF, UK
Hydrophones detect AE of offshore structures Hydrophonlc detection of acoustic emissions from propagating cracks on offshore structures ~s the basis of a system developed by Kockums AB of Malmo, Sweden. A umt of four hydrophones w h i c h is free from the structure but can be moved into contact for closer inspection p~cks up the s~gnals and relays them wa a single cable to the control room S~gnal analysis then locates and characterizes the cracks. The system has a frequency range of 1 0 0 - 2 5 0 kHz and a
A digital ultrasomc th,ckness meter announced by Midland Somc Services Ltd of Derby, UK, features an automatic zero system w h i c h as sa=d to ehmmate the need for cahbrat~on and test pueces before apphcat=on. Once the sound velocity has been set no other adlustments are required. The hand-held instrument, known as the UTM 2 0 0 0 , can be used on a wide range of metals, the standard transducer supphed offering a measuring range from 1.3 to 3 0 0 mm m temperatures from - 1 0 ° C to 50°C. Other transducers are avadable for use Jn difficult to reach locations and hot surfaces` For futher information contact: Mr B. Darnels, Mtdland Somc Serwces Lira~ted, Chapel Street, Spondon, Derby DE2 7JP, UK
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