A number of methods, ranging from visual inspection to detection by complex instruments, are available to check the tightness of joint and the soundness of welds in location where even very small leaks might be dangerous or undesirable. The more sensitive leak testing methods measure leaks as small as 1* 10-12 atm cc/sec.,
At present we offer some techniques of leak testing for vessels and chemical installation:
- halogen detection - sensitivity - 1* 10-7 atm cc/sec
- pressure decay - sensitivity 1* 10-4 atm cc/sec
- fluorescent tracer liquid 1* 10-4 atm cc/sec
- bubble testing - sensitivity 1* 10-3 atm cc/sec
Bond Testing of Composites Materials
BTW Institute Gamma also offers special NDT techniques which support the Zetec tester MIZ-21SR for detecting impact damages, disbonds, delaminations and other anomalies in honeycomb and composite materials.
Sondicator technology uses a dual element piezoelectric transducer to transmite and receive sound waves into composite materials. Any disbond or delamination within the inspection zone attenuate the sound waves and an experienced technician can interpret and determine the location and relative size of the disbond condition.
Resonance technology is a closely related ultrasonic inspection but in a lower frequency. Variable frequency monitors the impedance changes of the contact transducer's piezoelectric element. Small variations in the tested structure like disbonds affect the phase and amplitude of the signal on an LCD screen.