Introduction     BS 416 Socket and Spigot Cast Iron Drainage Pipes has long been employed by the building industry as a reliable and inexpensive drainage system.  Comparing with plastic pipes, cast iron is more solid and durable.  Furthermore, because cast iron has excellent noise suppression and fire resistant characteristic, it is every architect's choice for drainage inside the building.  Chung Wing Iron Works' BS416 and other cast iron products were first used in Hong Kong in 1952 at the North Point Healthy Village.  Ever since then, our products have now been used in over hundreds of building and civil projects.  This long history is a testimony to the quality of our products and sign of trust from our satisfying customers. Manufacturing Process     Our pipes from DN75 to DN225 are centrifugally cast; molten iron is poured into a spinning metal mold.  DN50 and DN300 pipes are cast using continuous casting machine; molten iron into a metal mold section which moved vertically.   Our pipe fittings are cast using sand mold. Technical Specifications General Cast Iron: Tensile Strength > 150 N/mm2 BS1452 grade 150 Pipes & Fittings: Dimensions BS416 Hydrostatic Pressure (0.5 bar for 15 sec.) BS416 Coating Test BS3416 BS416 Dimensional Requirements Dimensions Nominal size (DN) 50 75 100 150 Pipe: mm mm mm mm   internal diameter, min. a 48 74 99 150   outside diameter, max. b 63 89 114 165   thickness, nominal c 5 5 5 5 Socket: mm mm mm mm   internal diameter, min. d 73 100 127 181   outside diameter, max. f 89 116 143 197   thickness, nominal g 6.5 6.5 6.5 6.5   internal depth, nominal h 64 70 76 89 PIPES (with caulk lead joint)   Product No. Size (DN) L (mm) 010102 50 1830 010103 75 1830 010104 100 1830 010106 150 1830 010109 225 1830 010112 300 1830

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