Pump Seal And The Pipe System Selection
With the requirements of environmental protection and improvement of human health
, the leakage of the machine are required to improve. As the Pump Seal leakage is small, reliable sealing. Therefore, since 1885, the United Kingdom has produced the first mechanical seals, mechanical seals are widely used
In the chemical, petrochemical and medical devices. 70 ~ 80% of the current industrial pumps with Pump Seal.
Although the technology has developed rapidly in recent years, mechanical seal, cartridge mechanical seal continuous improvement and constant application of new materials, so that seal life is greatly extended, leakage is also significantly reduced. But this one is still very difficult to meet.
According to statistics, the total seal failure due to mechanical failure more than 40%. The reasons for this phenomenon, one as a dynamic seal in the pump unit, in which the working conditions of its own, the role played by the decision. Second, many domestic design institutes and engineering companies that use a pump factory sealed and sealed plant matter, often the choice of parameters of mechanical seals, type, structure and principles as well as deep understanding of piping systems, hard work involved in the selection of Pump Seals, Selection caused by improperly sealed.
From the point of use to introduce Pump Seal selection parameters, type, structure, standards and testing, and through selected examples for further elaboration.
Mechanical seal selection parameters are as follows:
1. Physical and chemical properties of transmission medium, such as corrosion, solid particle content and size, density, viscosity, vaporization, the gas content of the medium, and the media is easy to crystallization.
2. Install sealed in a space efficient (D and L) and so on.
3. Parameters
Determine the mechanical seal type
1. Push-based and non-push-type seal
Push seal: refer to aid seal along the shaft or sleeve to compensate for mechanical push the sealing surface wear of the mechanical seal, usually refers to the spring compression seals.
Non-push Type Seal: auxiliary seal secured to the shaft of the Pump Seal, usually a bellows seal.
2. Balanced and unbalanced seal
The pressure in the sealed chamber in the ring to form a closed force, end of the film formed between the opening force.
Non-equilibrium liquid-type seal can not balance the role of the face, end with the fluid pressure than the pressure rise up.
Exterior seal force balance method except the opposite direction, the other with the same built-in seals. In this case, to increase the hydraulic closing force in the share to offset the film between the seal faces the opening force.
Balanced seal can be part of the balance between the role of liquid on the face, end with the fluid pressure than the pressure rise to rise slowly.
General non-equilibrium model can only be used for low pressure, but poor lubricating properties, low boiling point, easily vaporized medium and high speed conditions, even under low pressure, it should use balanced seal. Because for non-balanced seal, when the seal cavity pressure rises, will be sealed
Face between the film extrusion, to damage the sealing surface soon.
Balanced pressure seal can be used in a variety of occasions. API682 no pressure specified in addition to the outside of sealed double sealed to allow use of non-equilibrium-type seal, the other should be a balanced seal.
3. Single seal, non-pressure double-sealed and pressurized double seal
Single seal: only a pair of friction pairs, simple structure, manufacture, easy disassembly, cleaning, only to set the system does not require external hydraulic system for sealing.
Pressure Dual Seal: There are two pairs of friction pairs, complex structure, the needs of the system for the sealing liquid, sealed cavity access than medium high 0.5 ~ 1.5bar pressure isolation liquid from the sealing, lubrication effect, isolation liquid internal side of the seal play lubrication.
Non-pressure double seal (formerly known as tandem seal): There are two pairs of friction pairs, complex structure, the needs of the system for the sealing liquid, the buffer is not sealed cavity pressure, process medium sealed inside play lubrication.
by: selina00123
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