This standard lays down the specifications for the material, dimensions, weights, and manufacturing quality of cast iron gratings with frames used for surface drainage purposes.
Specifies requirements for cast iron gratings with frames used for drainage purposes, including floor traps and gully traps.
Quick Reference Values
material gradeConforming to Grade FG 150 of IS 210
weight tolerance± 5 percent
dimensional tolerance± 3 mm to ± 5 mm
coating materialBituminous or coal tar base paint
Practical Notes
Always check the weight of incoming cast iron gratings on site; an under-weight grating often indicates thin casting and structurally weak material.
Ensure the grating sits flush within its frame without rocking to prevent noise and point-loading failure under traffic.
Verify the bituminous coating is uniform and intact to protect the cast iron from accelerated corrosion in aggressive drainage environments.