ADCP FSB-158 Teledyne RD Instruments Field Service Bulletin.pdf

TELEDYNE

RD INSTRUMENTS

A Teledyne Technologies Company

Field Service Bulletin FSB-158

Ocean Surveyor Orientation Advisement

Date: October 6, 2006

Abstract Recent testing has confirmed that the “Beam 3 forty-five degrees to Starboard” orientation improves ADCP performance further than originally believed. This orientation is recommended over the historical “Beam 3 forward” orientation because all four beams will measure radial velocities of the same magnitude. For high speed vessels a forty-five degree installation allows the overall vessel and sea current speeds to be greater.

Instrument/Program Affected Ocean Surveyor Product line (150 kHz, 75 kHz, and 38 kHz).

Description The Ocean Surveyor phased array ADCP has always had two acceptable orientations to installation.

First is the historical “Beam 3 forward” orientation similar to BroadBand Vessel Mount systems. While this orientation is acceptable, it is no longer recommended due to the significant performance enhancements of the alternate orientation. This second orientation is the strongly recommended “Beam 3 forty-five degrees to Starboard” orientation where the beam 3 mark on the OS is rotated to face forty-five degrees to the starboard side of vessel forward.

Recent testing has determined that the forty-five degree orientation is actually much more beneficial than previously believed. This testing is mainly due to the wide variety of individual installation factors on customer vessels. Despite the differences in vessel design, the Beam 3 forty-five degrees to starboard orientation should be considered the paramount orientation for configuration.

Solution/Action

New Installations New customers of Ocean Surveyor ADCPs are now highly recommended to install their ADCPs in the “Beam 3 forty-five degrees to Starboard” orientation.

Existing Installations Existing customers should make an effort to re-orient the alignment of their transducers at the next scheduled dry-dock when other maintenance or work is to occur.

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