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putkien seinämäpaksuuden on oltava huomattava, vähintään 11 mm, ja putkien on oltava hitsattuja lukuun ottamatta laipoitettua liitosta merivedenottoventtiiliin.
the pipes shall have substantial wall thickness, but in no case less than 11 mm and shall be welded except for the flanged connection to the sea inlet valve.