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One of the most critical parts of any rotary pump is the shaft seal. This is a the start of a 5 part series on seals beginning with the most basic: packing. To learn more, visit our website at vikingpump.com.

#VikingPump #Seals #Packing

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Hi, I’m Chad Wunderlich with Viking Pump. One of the most critical parts of any rotary pump is the shaft seal. While there are many different types of seals, they all serve the same role, to allow the shaft to rotate while keeping the liquid contained within the pump. This is a the start of a 5 part series on seals, you're watching the Pump Report. With all the seal options Viking has to offer it's probably best to start with the most basic: packing. Packing usually consists of braided or formed rings that are compressed in the stuffing box of the pump. As the packing is tightened, it squeezes up against the shaft and the stuffing box wall to create the seal. Packing is one of the oldest forms of shaft sealing and used to consist of leather, rope, or flax rings compressed around the shaft to limit leakage. Today packing is offered in a wide variety of inert materials such as expanded PTFE or compressed graphite. Viking Pump commonly offers 3 types of packing for our pump: standard, sanitary, and high temperature. Packing is economical and with no upper viscosity limit it works well for thick liquids which may be difficult to seal with other technologies. It also rarely catastrophically fails. If the rate of leakage increases, slight tightening usually fixes the problem. Packing does have some drawbacks, but the biggest one is that packing must be lubricated either externally or by the pumped liquid. This means that packing must leak or weep slightly. This can be messy and in the case of corrosive, flammable, or toxic liquids, is unacceptable. Packing is a very basic seal and it's a great place to start our seal discussion. Next time I'm going to be talking about Viking Pump OPro® seals which offer an upgrade for packing in many applications. To learn more about seals or to view other Pump Reports, please visit our website at VikingPump.com.