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MGDuff Ballast Tank De-scaling Systems

MGDuff Ballast Tank De-scaling Systems

MGDuff Ballast Tank De-scaling Systems

Product catalog summary
Introduction
Descaling ballast tanks using magnesium ribbon is a cost-effective method that simplifies the traditionally labor-intensive process. This technique requires minimal equipment and can be installed by a small team.

Specifications
The magnesium ribbon is a high-purity, extruded material with a steel wire insert. Typically, one meter of ribbon is needed for every three square meters of tank surface. It acts as a sacrificial anode, effectively removing loose matter and corrosion products.

Installation Procedure
The ribbon is lightweight (0.3 kg per meter) and is cut to length for specific vessels. It is clamped at the deck head and allowed to curl against the steelwork, ensuring it is not pulled tight. Clamps must be attached to clean, bright metal surfaces and should not be affixed to non-structural elements. Runs over ten meters require additional support.

Ballast Time
For effective descaling, tanks must be fully filled. The duration depends on water salinity: at least ten days for seawater and fourteen days for less saline water. Avoid ballasting in brackish water.

Safety Considerations
Hydrogen gas is produced during descaling, necessitating good ventilation and spark-free environments. Proper tank entry procedures and safety gear are essential.

Final Treatment
Post-descaling, loose scale must be removed, and any white residue from the galvanic process should be washed away. The tank is then ready for coating and cathodic protection installation.

Technical Specifications
The magnesium ribbon has a potential of -1.7 volts against an Ag/AgCl reference cell and a seawater capacity of 1230 Amp/Hrs/Kg. It features a 20mm x 10mm cross-section with a 3mm diameter mild steel core.

Clamps
End clamps are made of mild steel, weighing 0.75 kg each, and can fit most structural elements. Support clamps are similar and allow for reuse, offering cost savings.
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Catalog excerpts

MGDuff Ballast Tank De-scaling Systems-1

BALLAST TANK DESCALING WITH MAGNESIUM RIBBON 1 Timberlaine Estate, Gravel Lane, Quarry Lane, Chichester, West Sussex. P019 8PP

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MGDuff Ballast Tank De-scaling Systems-2

MAGNESIUM RIBBON FOR RAPID DESCALING De-scaling ballast tanks with magnesium ribbon offers ship owners and managers a cost effective solution to what can otherwise be a very labour intensive process. This type of system can be installed very simply by two or three people and does not require staging or shot blasting equipment. The ribbon is light and flexible and is fixed with screw down The Process utilises magnesium ribbon, a continuous length of extruded high purity magnesium of rectangular section with a steel wire insert. As a rule of thumb about one metre of magnesium ribbon will be required...

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MGDuff Ballast Tank De-scaling Systems-3

Magnesium ribbon can be fitted easily and quickly, the ribbon weighs only 0.3 kg per meter and is cut and prepared into lengths for the contract or vessel. The ribbon is prepared with the wire insert exposed for fitting to the clamps at each end. Following the system plan, clamp the ribbon at or near the deck head and allow it to drop and curl against the steel work then clamp again at the bottom end. Magnesium ribbon should not be pulled tight, but allowed to lie curled against the steelwork. In double bottom tanks the ribbon can be pulled through lightening holes in longitudinal floors Where...

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MGDuff Ballast Tank De-scaling Systems-4

High Potential Magnesium Ribbon Potential against Ag/AgCI Reference Cell -1.7 Seawater Capacity - Cross Section - Mild Steel Core - MAGNESIUM RIBBON END CLAMPS Magnesium ribbon clamps are made of mild steel and weigh approximately 0.75 most longitudinal bulb angles and The ribbon wire insert is held in place with a locknut and stud arrangement on 4mm hole to accommodate the ribbon insert. The clamp is held in place with a MAGNESIUM RIBBON SUPPORT CLAMPS These are similar in construction to the end clamps. The ribbon is fed through the top slot and held in place with a sharpened tip bolt and locknut...

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.