While pump shaft sizes are standardized, mixer shafts are not. For this reason, MECO offers its custom shaft seals for slow-turning bulk processing equipment, including mixers, blenders, reactors, conveyors, dryers, bucket elevators, grinders, crushers and agitators. Recognizing that no standard seals will work properly in every application, MECO engineers specify the design and construction materials for each seal according to precise shaft diameter, speed, clearance, process chemistry, temperature, pressure, etc. Seal materials are chosen from a variety of specialty and hardened alloys, bearing-grade plastics and specialty elastomers. FDA materials are available. Engineers select the optimal, patented seal design to suit each application. Factors such as thermal growth of the shaft and process pressure variations are calculated in to the designs. A wide range of shaft diameters can be retrofitted. Seals use different gas barrier fluids, at very low flow rates (5 ±5 litres per hour).