Plastics piping systems. Thermoplastics shafts or risers for inspection chambers and manholes. Determination of resistance against surface and traffic loading— 14 стр.
Plastics piping systems for non-pressure underground drainage and sewerage. Unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE). Specifications for manholes and inspection chambers in traffic areas and deep underground installations— 28 стр.
