Conley Floor Drains: A large-diameter drain with a deep sump connected to a large-diameter pipe will pass more water more rapidly than a smaller drain will. High-capacity drains are intended for use primarily in locations where the flow reaches high rates, such as in washdown areas and certain industrial applications. The open grate area of the drain should at least equal the pipe size area of the drain. For the sizing of floor drains for most indoor applications, the capacity of a drain is not extremely critical because the drain’s primary function is to handle minor spillage or fixture overflow. The exceptions are, of course, cases where equipment discharges to the drain, where automatic fire sprinklers may deluge an area with large amounts of water, and where flushing of the floor is required for sanitation.
Grates The selection of grates is based on use and the amount of flow. Light-traffic areas may have a fiberglass reinforced grate, while mechanical areas may have a large, heavy-duty, stainless steel grate. Where grates are not secured and are subject to vehicular traffic, it is recommended that non-tilting grates be installed. When a grate starts to follow a wheel or is hit on one edge and starts to tilt, the skirt catches the side of the drain body and the grate slides back into its original position. Flashing Ring This component makes an effective seal, when caulked, which prevents water from passing around the drain to the area below. Strainer Basket A “sediment bucket” is an additional internal strainer designed to collect debris that gets by the regular grate/strainer; it is required wherever the drain may receive solids, trash, or grit that could plug piping. Locations include mechanical equipment rooms, where pumps, boilers, water chillers, heat exchangers, and HVAC equipment regularly discharge and/or must be periodically drained for maintenance and repairs. Strategically located floor drains are also required in buildings with wet fire-protection sprinkler systems to drain water in case sprinkler heads are activated.