(1) Pibellau cyflenwi dŵr dan do, pibellau dŵr poeth, a phibellau cyflenwi dŵr pur.
(2) Piblinell cludo bwyd hylif mewn bwyd.
(3) System wresogi plymio, system bibellau aerdymheru ganolog, system wresogi radiant daear, system gwresogydd dŵr solar, ac ati.
(4) Pibellau at ddibenion telathrebu a thrydanol.
(5) Y system biblinell o blanhigion electroplatio, petrolewm a chemegol.