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Technical Information

SECTION 1
GENERAL OVERVIEW

1.1 SIZE, LENGTH, AND WALL THICKNESS
Technical Industries Inc., VisonArray Ultrasonic Inspection Systems are designed to inspect oilfield tubulars, ASTM, and other tubulars ranging in sizes from 1.99 inch to 30 inch OD, with couplings. Length capabilities range from 5 feet through 60 feet. Wall thickness minimums and maximums are a function of transducer frequency, shear wave angle, and pipe outside diameter. With the VisonArray inspection head design, transducers are easily interchanged with few limitations on pipe size, shear wave angle, and transducer frequency. This design allows quick changeovers to accommodate a variety of wall thickness.



1.2 COVERAGE
In the recommended standard "Full Scan" configuration, the transducers are oriented to provide 360° flaw detectability within 14 (fourteen) inches from the ends and wall thickness measurements within 2 (two) inches of the pipe ends. Variable speed controls for pipe rotation and gantry travel allow for easy and accurate control of the inspection helix.



1.3.DETECTABILITY
Transducers can be selected to produce various degrees of detectability and sensitivity. With proper transducer selection, all VisonArray systems are capable of repeatedly detecting small reflectors on both the I.D. and O.D. surfaces. These small reflectors include 1/8" diameter 5% round bottom pits and 1/2" x 0.010" x 5 % EDM notches at any orientation.



1.4 PRODUCTION SPEEDS
Production speeds are a function of numerous variables, some of which are: transducer size and frequency, material size, material length, material condition, system sensitivity settings, number and severity of flaws exceeding threshold, pipe straightness, etc. Under normal condition, using the recommended "full scan", non-stop scanning speeds average approximately 30 (thirty) seconds per inch of outside diameter.

EXAMPLE: 30 sec. x 7"=Approx. 3.5 minutes per 40 foot length.

Using the "mill scan", non-stop scanning speeds average approximately 10 (ten) seconds per inch of outside diameter.

EXAMPLE: 10 sec. x 7" =Approx. 70 seconds per 40 foot length.

For complete cycle time, using the standard loading and unloading procedures, approximately 1 (one) minute is added for loading and unloading.



1.5 ULTRASONIC TEST INSTRUMENTS
The VisonArray test systems have twenty channel flaw/thickness capability. Each channel has a maximum repetition rate of 2,000 pulses per second. This system provides a "True Systems Approach" to ultrasonic testing of oilfield tubular goods.



1.6 TRANSDUCERS
The VisonArray test systems utilize specially designed, custom built transducers. The crystal is set in a cylindrical housing and pre-set to a fixed, specified angle at manufacturing. Many different sizes, frequencies and angles can be utilized to accommodate most any need.



1.7 TRANSDUCER HEAD ASSEMBLY
The transducer head assemblies are uniquely designed and field-proven for ruggedness and continuous production service. Construction is of corrosion-resistant material. High-density plastic wear-shoes protect the transducers and contain the couplant to provide the desired water gap between the transducer and the pipe surface. Orientation and vertical position of the transducers are adjustable. With the unique VisonArray head design, transducers are easily interchanged with few limitations on size, angle and frequency. This design allows for quick set-ups and/or changeovers to accommodate a variety of needs.