This part of BS 5911 specifies requirements and describes test methods for prestressed concrete non-pressure circular pipes and fittings with flexible joints (with seals either integrated in the units or supplied separately) and nominal sizes not exceeding DN 3200, for which the main intended use is the conveyance of sewage, rainwater and surface water under gravity or occasionally at low head of pressure, in pipelines that are generally buried.

BS EN 752 ,BS EN 1295‑1 and BS EN 1610 deal with the planning, design, installation and testing of drains and sewers.