Removing Biofouling; Zinc Anode Inspection And Replacement; Zinc Anode Inspection - Teledyne WORKHORSE Operation Manual

May 2015

Removing Biofouling

To remove foreign matter and biofouling:
1. Remove soft-bodied marine growth or foreign matter with soapy water. Waterless hand cleaners
remove most petroleum-based fouling.
Do not use power scrubbers, abrasive cleansers, scouring pads, high-pressure marine cleaning
systems or brushes stiffer than hand cleaning brushes on the transducer faces. The urethane
coating on the transducer faces could be damaged.
If there is heavy fouling or marine growth, the transducer faces may need a thorough cleaning to
restore acoustic performance. Barnacles do not usually affect H-ADCP operation, but TRDI does
recommend removal of the barnacles to prevent water leakage through the transducer face. Lime
dissolving liquids such as Lime-Away
stiffness brush usually removes the soft-bodied parts. Do NOT use a brush stiffer than a hand
cleaning brush. Scrubbing, alternated with soaking in Lime-Away
nacles.
If barnacles have entered more than 1.0 to 1.5 mm (0.06 in.) into the transducer face
urethane, you should send the H-ADCP to TRDI for repair. If you do not think you can remove
barnacles without damaging the transducer faces,
2. Rinse with fresh water to remove soap or Lime-Away
3. Dry the transducer faces with low-pressure compressed air or soft lint-free towels.
Always dry the H-ADCP before placing it in the storage case to avoid fungus or mold growth.
Do not store the H-ADCP in wet or damp locations.

Zinc Anode Inspection and Replacement

H-ADCP systems have five sacrificial zinc anodes. If the H-ADCP does not have exposed bare metal,
properly installed anodes help protect the H-ADCP from corrosion while deployed.

Zinc Anode Inspection

The life of a zinc anode is not predictable. An anode may last as long as one year, but dynamic sea condi-
tions may reduce its life. Use a six-month period as a guide. If the total deployment time for the anodes
has been six months or more, replace the anodes. If you expect the next deployment to last six months or
more, replace the anodes.
To inspect the anodes:
1. Inspect the anodes on the transducer assembly, housing and end-cap for corrosion and pitting. If
most of an anode still exists, you may not want to replace it.
2. Inspect the RTV-covered screws that fasten each anode. If the RTV has decayed enough to let wa-
ter enter between the screws and the anode, replace the RTV.
3. If you have doubts about the condition of the anodes, remove and replace the anode.
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EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
break down the shell-like parts. Scrubbing with a medium
®
contact
residue.
®
WorkHorse H-ADCP Operation Manual
, effectively removes large bar-
®
TRDI.