PTFE Lantern rings are usually in the center of every compression packing set in a centrifugal pump. They are simple components, but get something wrong when selecting, installing or operating them, and big problems may occur in the stuffing box. A lantern ring is placed between packing rings in each packing set and extends the life of the packing, stuffing box and shaft. Ultimately, lantern rings increase the life span of the pump system.
Lantern Ring
About Lantern Ring
Ensuring stuffing box reliability and controlling the environment mitigate many issues in the ‘space’ where it happens.
PTFE Lantern rings serve three purposes: protection, cooling and lubrication. They protect the stuffing box and the installed packing by providing an access point for flush water. If process fluids or other contaminants enter the stuffing box and are not removed by flush water, several problems occur, including: • damaged or destroyed packing • shaft or sleeve damage • stuffing box wear A lantern ring also gives the stuffing box an outlet to assist with cooling. It allows the system to avoid being completely closed off and assists in mitigating overheating. The final lantern ring purpose is lubrication. Compression packing causes friction along the shaft and stuffing box walls or casing. Fluid entering through the lantern ring lubricates the packing. The liquid reduces friction, limits the wear of the machine’s parts and decreases heat within the system.
Size of Lantern Ring / H * W (mm)
LENGTH 1200MM
Remark:
Considering the inch size, there may be some error between the actual delivery size and the data in this table, which will not affect installation and use.
| 7,6x11,4 | 9,0x 13,2 | 9,0x19 | 9,4x13,2 | 10,5x 14,3 |
| 10,5x22 | 11,1x15,6 | 12,1x17 | 12,1x25,4 | 12,6x17 |
| 13,5x19,2 | 14,2x19,2 | 15,2x20,6 | 15,2x31 | 17x22,1 |
| 18,1x22,1 | 18,1x38 | 19 x23,8 | 20,8x25,2 | 23,5x28,2 |
Lantern Ring Structural Style
Materials for Lantern Rings
Selecting the correct material for the application is critical. Lantern ring selection should be given equal consideration because they are equally as important as packing. PTFE and PEEK, general material for Lantern Ring.
PTFE & PEEK Strengths & Weaknesses
| PTFE Strengths | PTFE Weaknesses |
|---|---|
| Broad chemical resistance | Creep and cold flow |
| Nonflammable | Relatively soft |
| Low-temperature flexibility | Low thermal dissipation |
| Low coefficient of friction | Poor dimensional stability |
| High-temperature stability | High material shrinkage |
| Easy to process | Low rigidity |
| High-frequency resistance | Low electrical conductivity |
| PEEK Strengths | PEEK Weaknesses |
|---|---|
| Tensile strength, elongation and wear properties | Not suitable for applications involving nitric or sulfuric acid |
| Chemical resistance | More costly |
| Withstands long exposure to high pressure, water and steam | Difficult to process |
| Low flammability | |
| Resistant to gamma radiation | |
| Continuous use up to 500F |
How Is a Lantern Ring Installed?
Most packing sets have five packing rings. The lantern ring can be inserted after the second or third packing ring is installed. This all depends on where the flush port of the stuffing box is located. To ensure that the lantern ring is installed correctly, insert a small object through the flush port and feel the lantern ring. Once this is done and all the packing rings and packing follower are installed, end users should install the proper flush setup and start flushing the stuffing box. For many reasons, starting the flush before operating the pump is important. One reason is to ensure that flush water is moving through the lantern ring and into the stuffing box correctly. Care must be taken to ensure the lantern ring’s fit around the shaft is correct. Most lantern rings have a larger fit on the inside diameter and a tighter fit on the outside diameter, so frictional heat is not an issue.
Feedback from user
What They Are Saying
Super long service life, greatly reduce the replacement frequency. It must be made by very good PTFE raw material. I think the machining size is very uniform, which is also the reason for its extraordinary use.
James
- Maintenance of equipment
PTFE Lantern Rings
What are PTFE Lantern Rings?
PTFE lantern rings are a type of mechanical seal that is used to prevent leakage from rotating shafts or rods. They are made of polytetrafluoroethylene (PTFE), a material that is known for its excellent chemical resistance, low friction, and wide temperature range. PTFE lantern rings are typically used in applications where there is a need for a high level of sealing and where the seal must be able to withstand harsh conditions.
How do PTFE Lantern Rings Work?
PTFE lantern rings work by creating a seal between the shaft or rod and the housing. The seal is created by a series of lip seals that are made of PTFE. The lantern ring is also equipped with a small reservoir that can be filled with lubricant. The lubricant is then fed into the seal area to keep the seal lubricated and to prevent wear.
Benefits of PTFE Lantern Rings
There are many benefits to using PTFE lantern rings, including:
- Excellent chemical resistance
- Low friction
- Wide temperature range
- High level of sealing
- Durable
- Easy to install
Applications of PTFE Lantern Rings
PTFE lantern rings are used in a wide variety of applications, including:
- Pumps
- Compressors
- Agitators
- Mixers
- Valves
- Other rotating machinery
Choosing the Right PTFE Lantern Ring
When choosing a PTFE lantern ring, it is important to consider the following factors:
- The size of the shaft or rod
Where to Buy PTFE Lantern Rings
PTFE lantern rings can be purchased from a variety of industrial suppliers. You can also find them online from a number of different retailers.
PTFE Lantern Ring
What is a PTFE Lantern Ring?
A PTFE lantern ring is a type of seal that is used in mechanical pumps and other applications to prevent leakage of fluids. It is made of polytetrafluoroethylene (PTFE), a material that is known for its excellent chemical resistance, low friction, and wide temperature range. PTFE lantern rings are typically used in conjunction with other types of packing, such as braided or spiral packing.
How do PTFE Lantern Rings Work?
PTFE lantern rings work by creating a space between the packing and the shaft or sleeve. This space is filled with a lubricant, which helps to keep the packing lubricated and cool. The lantern ring also helps to prevent contaminants from entering the packing area.
Benefits of PTFE Lantern Rings
There are many benefits to using PTFE lantern rings, including:
- Excellent chemical resistance: PTFE is resistant to a wide range of chemicals, including acids, alkalis, and solvents. This makes it a good choice for applications where the packing will be exposed to harsh chemicals.
- Low friction: PTFE has a very low coefficient of friction, which means that it does not generate much heat when it rubs against other materials. This helps to keep the pump operating smoothly and efficiently.
- Wide temperature range: PTFE can be used in a wide range of temperatures, from -450°F to 500°F (-268°C to 260°C). This makes it a good choice for applications where the pump will be operating in extreme temperatures.
- Easy to install: PTFE lantern rings are relatively easy to install. They can be cut to size and fitted around the shaft or sleeve without the need for any special tools.
Applications of PTFE Lantern Rings
PTFE lantern rings are used in a wide variety of applications, including:
- Centrifugal pumps: PTFE lantern rings are commonly used in centrifugal pumps to seal the shaft or sleeve.
- Positive displacement pumps: PTFE lantern rings can also be used in positive displacement pumps, such as piston pumps and diaphragm pumps.
- Rotary compressors: PTFE lantern rings are used in rotary compressors to seal the shaft or sleeve.
- Agitators: PTFE lantern rings are used in agitators to seal the shaft or sleeve.
- Valve stems: PTFE lantern rings can be used to seal valve stems to prevent leakage.
Choosing the Right PTFE Lantern Ring
When choosing a PTFE lantern ring, it is important to consider the following factors:
- The type of fluid being sealed: PTFE lantern rings are available in a variety of materials to suit different types of fluids.
- The temperature of the application: PTFE lantern rings are available in a variety of grades to suit different temperature ranges.
- The pressure of the application: PTFE lantern rings are available in a variety of sizes to suit different pressure ratings.
- The size of the shaft or sleeve: PTFE lantern rings are available in a variety of sizes to fit different shaft or sleeve diameters.
Conclusion
PTFE lantern rings are a versatile and reliable type of seal that can be used in a wide variety of applications. They offer a number of benefits, including excellent chemical resistance, low friction, and a wide temperature range. When choosing a PTFE lantern ring, it is important to consider the factors listed above to ensure that you choose the right ring for your application.
Additional Resources
- John Crane PTFE Lantern Rings
- Garlock Lantern Rings for Flush Water
- Industrial Packing Inc. PTFE Lantern Ring
Disclaimer
The information provided in this webpage is for informational purposes only and should not be construed as professional advice. Please consult with a qualified engineer or other professional to ensure that you are using the correct PTFE lantern ring for your application.