Sewers for Adoption and Sewers for Scotland Guidelines call for an outfall safety grille to be fitted to any headwall with a pipe opening greater than 350mm. Sewers for Adoption Guidelines specify that an outfall safety grille must be a minimum of 270mm wider than the outside diameter of the pipe, have bars at 100mm spacing, be hinged and have a padlock facility.
All our outfall safety grilles, standard gratings and trash screens are hot dip galvanised to BS EN 1461 after fabrication but are all available in stainless steel if required.
Our outfall safety grille type 4 is hinged on both sides, has a padlock facility at the top and bottom and bars spaced at 100mm. Type 4 outfall safety grilles are particularly useful where space on the spillway of a headwall or outfall structure is restricted either due to length or if there is a requirement for stepped baffle blocks etc.
With a Type 4 outfall grille the grate finishes 150mm above the invert level of the incoming pipe allowing low flows to run uninterrupted without compromising safety.
The 600mm Sewers for Adoption Outfall Safety Grille Type 4 is designed for use with concrete pipework up to 600mm and twinwall plastic pipework up to 600mm