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Case Study Cation Water Vessel

Shell Nederland Chemie, location Moerdijk

Exterior of vessel V-402B

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Date or period: October 19 – 30, 2016

Site & Location: Shell Nederland Chemie, location Moerdijk, The Netherlands

Key Persons Present:

William Lobban/RPR-OperatorScott Bradshaw/RPR-OperatorDag Rune Wiksten/RPR-Supervisor Stian Johnsen/RPR-Supervisor Arnold Schep/Business Unit Manager/Bilfinger Brabant Mobiel Jeroen van den Oever/Team manager/Bilfinger Brabant Mobiel Ruud Hidding/First Line Supervisoir/Shell Nederland Chemie Gwen v.d. Bilt/First Line Supervisor/Shell Nederland Chemie Joost Verkouter/Electric Engineer/Shell Nederland Chemie

Object treated: Cation Water Vessel V-402B, H 6,4 m x Ø 3,5m

Surface Description: Tank shell presented a 2 layer coating of approx. 2,5 - 3mm, believed to be 2 – 2,5 mm ebonite and 0,5 mm of glass flake on the top. The lower dome had asoft rubber coating of approx. 6 mm glued to the steel. The interface between the shell and the lower dome had a 4 layer coating of approx. 12 mm thickness starting with 2,5 mm of ebonite, 3,5 mm of two unknown mid layers and a 6 mm soft rubber layer.

Requirement: Remove all the interior coating

Result: Very satisfactory removal of the thick and difficult coating. Only a sweep blast required to get the specified cleanliness and profile for new coating.

Comparison:

Removal of coating:

Quantity of grit:

Old method (sandblasting)

Extremely time –consuming 90.000 – 150.000 kg

RPR induction disbonding

3 m2/h ideal, incl evac. 1.5 m²/h real, incl evac. 4.800 kg (sweep blast)

Savings

Considerable Considerable 95 - 97 %

Conclusion/Prospects: As a first time trial job on Shell Nedeland Chemie there were many issues to overcome, such as electrical safety, personal safety and permissions to enter the site and to enter the vessel itself, before the work actually could commence. This was time consuming. However, the client’s intention is to make a standard procedure for this kind of job, for a smooth and effective execution in the future.

The coating was supposed to be a 300 µ glass flake coating. Given that a 10 times thicker coating was found inside the vessel, the job had to be extended from 1 week to 2 weeks.

The RPR Induction Disbonder proved to be efficient on this coating. All in all, and given the adverse circumstances of the coating, the conclusion is that the coating was removed to the client’s satisfaction. So much that Shell Nederland Chemie wants to make a standard working procedure for this application.

Bilfinger Brabant Mobiel states that it is no option to remove this coating with grit blasting.

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2 layer shell coating. Ebonite 2,5- 3 mm + glass flake 0,3 mm

2 layer bottom dome coating. Adhesive + soft rubber 6 mm

4 layer interface coating. Ebonite + unknown intermediate + unknown intermediate + soft rubber, total 12mm

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Complete system setup: Induction Disbonder, water deposit, diesel generator and water cooler on trailer. Additional utilities: Exhaust fan and isolation transformer

Many obstructions in the bottom of the vessel

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Lower mid section

Finished job

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Proper PPE. Safe and happy operator

The only waste.