Fitting Instructions for Aluminium Hulls

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NOTE: When fitting and replacing Bolt-On Anodes always ensure that the serrated fan disc washers are replaced.

To provide protection to the stern gear the shaft should be fitted with an MGDUFF Electro Eliminator Brush and earthed to the hull. Additionally the gearbox should be bonded to the hull using 4mm2 multi strand cable and any flexible couplings in the shaft should be bridged with a copper strap or cable.

Anode Positioning

Position anodes around underwater hull as shown Below. Positions may be adapted slightly to suit individual vessels.
Prepare and paint the hull in accordance with a reputable paint manufacturers specification before anodes are fixed.
Fit anodes using galvanised mild steel set bolts with fan disc washer making sure that the anodes are pulled up tight against the hull.
No paint must be allowed to fall on the surface of the anode itself at any time.

Maintenance

To ensure correct level of protection anodes should be replaced when 80% consumed or if it is anticipated that they will be more than 80% consumed at the next scheduled docking.

Type ZD42 strip anodes

This is a low profile zinc anode with a non reactive aluminium insert, ideally suited for fitting to high speed aluminium hulled vessels. The anode is not recessed but prominent on hull surface and can be attached after construction.

Each anode requires 3 or more fixing positions:-

ZD42/36" and ZD42/54" -3 fixing positions
ZD42/72" -5 fixing positions (7 on fast craft).

The ZD42 anode is supplied in 6ft (1830mm) lengths and may be cut to length. It can be supplied un-drilled or drilled and counter bored to standard centres, Fixing holes are drilled to suit 10mm studs and it is imperative that the fixing hole is counter bored down to the aluminium core.

This shows a typical installation (suitable for attachment after construction).

This shows a typical installation (showing fitting arrangement for new buildings.)

Hull mounted ZD55 Recessed Disc Anodes

This 9" (225mm) diameter anode is generally utilised for flush mounting when minimum drag is required and is therefore normally incorporated on new construction where the circular recess can be arranged more easily

Type ZD72B(M) Zinc Hull Anode

This low profile cast anode is suitable for lower speed craft, where the surface mounting will not result in excessive drag. It can be attached after construction.