With merchant vessels the cofferdams are usually built up on the hatch coamings of the cargo holds.
Ngeenqanawa zorhwebo izithintelo zamanzi xa kusakhiwa idama okanye ibrorho zisoloko zisakhina kwisivalo semiphetho ephakamileyo yokunqanda amanzi angangeni emingxunjeni ekulayishwa ngayo inqanawa yezibambi mithwalo.