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>On Tue, 5 Sep 1995, Bernie Chowdhury wrote:
>
>> (snip) Note that OMS cylinders are the only cylinders on the market
>> that are ultra-sonically tested."
>>
>> Bernie Chowdhury
>
>Bernie,
> What does "ultrasonic testing" mean? I assume it is a method of
>detecting imperfections in the tank, but how?
HI !
Ultrasonic tests are used to check for internals brake lines in side the
object's
material. It uses high frequency sound waves that pass through the material
and received by a receiver on the other side of the object. On the
instrument's screen the operator can see any brake lines or cracks in side the
material.
In that way you can detect cracks that are not visible because they are too
small
or because they did not brake the object's surface, yet.
The ultrasonic system is also used to check under water pips, ships, bridges,
air planes wings AND babies (babies have a little different system but the same
idea).
Israeli dive industry, navy and recreational systems require equipment
ultrasonic and hyperbaric and sometimes x-ray tests every 3 to 5 years
depending on the working pressure and tank stile.
Regards.
Erez
Erez Boym o
CMas DM, Deep Air,MIX Gas * Welcome to the * oO
26 Pinsker St', Haifa, Israel * religion of diving * OOo
EMail - dp18382@el*.co*.il* _____ o
Tel - 972 4 316610 (_/-\_)
972 4 222044
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