IMPACT SUBSEA
INNOVATIVE UNDERWATER PRODUCTS
www.impactsubsea.com
Document No:
0000.1913 |
Version No:
1.2 | 23
rd
April 2020
22
Q. I have tested the ISFMD setup in the workshop in advance of deploying subsea. In some
tests, I get a small reading (0.1m to 0.30m) for non-flooded member. What is causing this?
A.
We would recommend checking the transmit power level (FMD -> Member Setup ->
Transmit Power). In some environments, an acoustic return may be produced by the member
under test due to its own acoustic properties (even when not flooded). Reducing the transmit
level will reduce the energy being transmitted into the member and remove the small reading.
Please note, the transmit level should only be reduced to a level to remove noise, not to a level
which would prevent detection of the flooded member.
It is recommended that the transmit pulse level is reduced in 5% increments until the noise is
no longer apparent.
The system should then be tested against a known flooded/unflooded member in question to
verify settings.
Q. The ISFMD system appears to be for use only underwater. Can I use this system in air?
A.
The ISFMD system has been designed to work underwater, using the water as
a coupling
medium to the member to be tested.
The system can be used in air, but will require a coupling jell to ensure a good acoustic contact
between the ISA500 probe and the surface member under test.
