ASME A112.14.4 pdf download GREASE REMOVAL DEVICES 1.4 Definition automatic grease/oil removal device (GRD): a plumb- ing appliance that is installed in the sanitary drainage system in order to intercept free-floating fats, oils, and grease from waste water discharges. Such equipment operates on a time- or event-controlled basis and has the ability to remove the entire range of commonly available...