Ship cleaning
4Pages

3000 bar UHP water blasting systems for surface preparation in ship building and ship repair Hammelmann ultra high pressure water blasting systems operate at pressures up to 3000 bar without any abrasive additives. Using water eliminates the harmful and often damaging side effects produced by dry abrasive blasting such as airborne dust, chemical/ thermal pollution and surface ingrained residual blasting materials. It is the healthy, environmentally friendly method of surface preparation. The energy of the high velocity water jets blasts into the pores in the metal surface flushing out solid foreign matter and non water soluble pollutants such as oil and grease. Remaining chloride levels are at least 5 times lower than in a grit blasted surface and the substrate profile remains intact ensuring good adhesion of the new coating and greatly reducing the risk of future paint film defects. Substrates prepared by Hammelmann systems meet the quality requirements set by international paint manufacturers and standards authorities for the application of new coatings. Red epoxy shop primer The amount of waste produced is far less than that produced by dry blasting. It is only the waste water, old paint, marine growth and rust which is easily collected for separation and disposal. Water can be treated for disposal or recycling. Shrouding the work area is not necessary. Water will not harm nearby seaworthy equipment and machinery as is often the case with ingress of flying grit particles nor is there any unhealthy dust to distress yard personnel. Rust The water pressure necessary depends upon the condition of the existing surface layer(s), the type of coating to be applied and the substrate quality necessary for the successful application of that coating. These illustrations are extracts from HEMPEL’S reference handbook of NACE/ SSPC standards showing substrate grades with the original surface conditions at the top. Economic, ecological removal of TBT coatings

Semi automatic UHP systems Semi automatic UHP metal surface preparation systems are capable of producing a range of surface finishes from washed, swept, selectively removed coating(s) right through to blank metal. The traverse speed over the surface and the stand off distance between jetting nozzles and the surface are adjustable to enable optimum working efficiency. The self propelled vehicle has a turntable mounted telescopic jib with a work arm mounted at the tip carrying an Aquablast® surface blasting unit. The Dockmaster® is specifically designed for cleaning, rust removal and coating...

The remotely controlled SpiderJet® 3000 attaches to the work surface by vacuum force. It can blast while traversing both vertically and horizontally in either direction on flat and on curved surfaces and can also operate overhead. Two powerful pneumatic motors drive the wheels of this extremely manoeuvrable unit enabling surface blasting rates of up to 70 m2/h to be achieved from a working width of 375 mm. Waste water and waste materials are directly vacuumed away from the work surface. A twin cable arrester and permanent vacuum force monitoring coupled to automatic pump pressure shut down...

Manual UHP water blasting tools The efficiency of manual water blasting tools is very dependent upon the operator. They are normally employed for special small surface area blasting tasks. Hand held guns fitted with water driven Rotorjets or with pneumatically driven specialist nozzle carrier heads are particularly useful for working in restricted access areas or for intensive spot blasting. The hand held Aquablast® is the ideal tool for flat vertical surface treatment. It has a working width of 140 mm. Repair yard and on board applications Flexibility of deployment and ease of handling...