A tandem seal increases on line reliability and is considered the safest environmental design. If a primary seal failure occurs on a critical piece of equipment, the outboard seal can take over and function until maintenance of the equipment can be scheduled. Alarm systems can be installed with censors to determine an increase in the pressure between the two sets of seal faces. This is easily established by adding a pressure gauge on the line coming from the seal pot to the double cartridge seal.
Tandem seal systems are used for products such as vinyl chloride, carbon monoxide, light hydro carbons, and a wide range of other volatile, toxic, carcinogenic, or hazardous fluids. Tandem seals eliminate icing and freezing of light hydrocarbons and other fluids which could fall below the atmospheric freezing point of water in air (32°F or 00C) because both seal faces are inside the stuffing box.. Typical buffer fluids (contained in the seal pots ) in these applications are ethylene glycol, methanol, and propanol.
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