Comparison of Advantages And Disadvantages of Three Sealing Types of Slurry Pumps
DU Shujie - Shanglishi Pump Group
Manufacturer of Double Suction Pumps, Slurry Pumps, Submersible Pumps, Industrial Centrifugal Pumps in Shijiazuhang, Hebei, China. Enquiry email: [email protected]
Slurry pumps are used to transport solid-liquid mixtures (slurry, mud) with higher concentrations during mineral processing. Such pumps include sludge pumps, mud pumps, impurity pumps, dredging pumps, dredging pumps, desulfurization pumps, submersible pumps, etc.
What are slurry pumps used for?
Slurry pumps are one of the indispensable equipment in various processes such as mineral processing, coal preparation, desulfurization, and filter press feeding. For example, our company's pumps are often supplied to internationally renowned mineral processing plants of gold, copper, zinc ore, etc. In a word, slurry pumps play an important role in transporting slurry in the mineral processing process.
Why does the slurry pump’s shalf need to be sealed?well?
The transportation of ore slurry has strict requirements on the sealing performance of the pumps. Since the slurry delivered by the slurry pump may be corrosive and can easily corrode operators and equipment, the slurry's inner shaft must be sealed well.
If the slurry pump seal is not good, it will cause the slurry to leak in the pump's shaft. Serious consequences include: after the fluid enters the pump's bearing, it will dilute and change the quality of the lubricating oil, aggravate bearing wear, cause vibration, and shorten the pump and accessories' lifetime. Therefore, the pump must maintain a good sealing state when we use it, said the engineer Mr. Wang.
Three Types of Shaft Sealing of Slurry Pumps
The shaft seals of slurry pumps generally include three types: Packing sealing, Empeller sealing and Mechanical sealing.
We will explain the comparison of the 3 different sealing types as follows.
(1). Packing Sealing
First of all, packing sealing is the most common sealing method among the three types. The Packings (generally made of materials PTFE) which are put in the Packing Box are in full contact with the pump's shaft, and by injecting Shaft Seal Water, a certain pressure of water is continuously injected into the filler to prevent the transmission from leaking, thereby to achieve the purpose of sealing. The pressure of the Shaft Seal Water must exceed the outlet pressure by 1.5 kg.
When transporting corrosive materials, the packing may be corroded, so the disadvantage of this sealing form is that it cannot transport toxic and corrosive liquids. The packing shaft seal has a simple structure, is easy to maintain, and comes with lower cost. This sealing method is widely used in mineral processing plants and coal washing plants. The advantages are its convenience, simplicity for maintenance and low cost.
(2). Empeller Sealing
The empeller sealing of the slurry pump relies on the empeller to generate a reverse centrifugal force to prevent the slurry from leaking, thus achieving a sealing effect.
The empeller seal requires that the backflow pressure of the slurry pump does not exceed 15% of the outlet pressure of the slurry pump. The empeller shaft seal has the advantages of no need for shaft seal water, no dilution of the slurry, and good sealing effect. Therefore, when the slurry does not allow dilution, or when there is no flushing water at operation site, this empeller sealing type can be considered.
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(3). Mechanical Sealing
The Mechanical Sealing includes a moving ring and a stationary ring that are in close contact with each other in the axial direction through springs to achieve the purpose of sealing. Mechanical seals are generally divided into single-end mechanical seals and double-end mechanical seals. The mechanical sealing is very reliable and almost does not leak even a tinny drip of slurry. However, care should be taken to protect the friction surface during its installation.
The mechanical sealing's requirements are high, the cost is higher than packing sealing and empeller sealing, and the maintenance work is relatively more difficult than the other two shaft seaing methods.
Below please see one table:
If you have further questions about the shaft sealing types of centrifugal slurry pumps for mineral processing plants, welcome to send us email to [email protected] or whatsapp +86 18133826597
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