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Definition: Pibell a gaiff ei chynnwys yn rhan o adeiladwaith adeilad uchel, o’r llawr daear i’r llawr uchaf, ac y gellir cysylltu pibell ddŵr diffodd tân iddi. Mae darpariaeth o’r fath yn golygu nad oes angen i ddiffoddwyr tân gludo pibellau dŵr hir i fyny grisiau mewnol yr adeilad mewn achos o dân.
