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Lantern Rings are metal rings with holes that distribute lubricant to the Packing, Shaft Sleeve, and Shaft. MOVING ON TO "THE POWER SIDE" OF THE CENTRIFUGAL PUMP. The smooth, brass Lantern Ring in the nearby photo is surrounded by the dark, braided fiber Packing Rings. This feature makes it an ideal design for fire departments in fire pump … The Shaft is attached to the Impeller and extends through the Stuffing Box in the middle and Bearing Box on the left. Packing will decrease leaking to a controlled minimum ...  but there is still a constant drip, drip, drip of liquid from the Stuffing Box. Because the PV Pressure of the discharged "pumped up process liquid" (aka lubricant) in the Stuffing Box is greater than the PV Pressure on "The Pumping Side" of the Pump, the lubricant/process fluid will naturally "leak back" into "The Pumping Side" of the pump! Just like Packing Rings, Lantern Rings rotate with the Shaft. The advantages of Mechanical Seals over Packing include: The basic parts of a Mechanical Seal are: Heat from friction is generated at the interface of the Stationary Seal with the Rotating Seal and Shaft. Explaining the form and function of Packing in a Stuffing Box is best done via You Tube! f) Pump and drive unit misaligned. PTOA Process Variable Pressure Focus Study Area Replace worn shaft sleeve if needed. In this photo it is easier to see how the Shaft is attached to the Impeller. The Chesterton video gets relevant to Process Operators around minute 3 and a half  ... so hang in there! It is used to prevent leakage of fluid, such as water or steam, between sliding or turning parts of machine elements. • Mechanical defects. Where it will go. The gray surfaces are stationary hardware components. Pump or suction pipe not completely filled with liquid 3. c) Stuffing box too tight d) Wear rings worn. A Lantern Ring is shown in the above left photo. When it comes to centrifugal slurry pump maintenance, a stuffing box is the best option for time-sensitive issues that may arise. For this reason, Seal Oil Pots are installed right next to every pump with a Mechanical Seal to insure their internal hardware components are always cooled with Seal/Lubrication Oil. But sometimes the chemical properties of the "pumped-up" process liquid are not sufficiently compatible with the Packing to perform the lubricating function. Note a small amount of oil drips out of the Stuffing Box of the Pump. The … Suction pipe lift too high 4. #New installation of mechanical seal for the centrifugal pump. And now all PTOA Readers and Students know the form and function of "the stuff" found in a Centrifugal Pump's Stuffing Box! The gray container installed on this Pump Frame contains Seal Oil for the Mechanical Seal. The pump suction may be under a vacuum so that outward leakage is impossible or the fluid may be too hot to provide adequate cooling of the packing. size of packing diam. The Stuffing Box is adjacent to the Pumping Side Casing. Heck! Excessive amount of air or gas in liquid 6. 832 centrifugal pump stuffing box products are offered for sale by suppliers on Alibaba.com, of which mining machinery parts accounts for 1%, seals accounts for 1%. The lubrication oil is distributed to the Shaft Sleeve, Shaft, and Packing via the holes in the spinning Lantern Ring. The Chesterton Video showed the "allowable leakage" from the Stuffing Box of a real, working industrial pump. There simply isn't sufficient space between the two flat surfaces to leak through! It is used to prevent leakage of fluid being pumped between rotating parts and stationary parts or machine elements. The gold Enclosed Impeller is on the right. The ring-shaped Rotating Seal does rotate with the Shaft and is fabricated from a hard material like silicon-carbide where it comes into very nearly direct contact with the Stationary Seal Ring. The term "Stuffing Box" refers to the cavity of space within the interior of the pump Casing where the Shaft pierces "the collar" ... or whatever physical barrier separates "The Pumping Side" of the pump from "The Power Side" of the pump. Greatly reduces pump leakage when the pump operates at extreme PV Pressure or PV Temperature. The Shaft extends from the Stuffing Box into the Bearing Housing. Hey! Mechanical Seals primarily prevent leakage around the Shaft of a pump by mating the flat face of a ring-shaped Rotating Seal to the flat face of a ring-shaped Stationary Seal. Chesterton Company for providing the below 8.5 minute video which features replacing Packing in a Stuffing Box. JAVASCRIPT IS DISABLED. The purpose of this bushing is to prevent packing from extruding through the bottom of the stuffing box. The form and function of common hardware components found in the, At the very end of the video, Chesterton shows how the pre-lubricated, Much less maintenance over the life of pump compared with. … A Lantern Ring is just a metal ring with holes in it that allow the lubricant flow onto the Shaft Sleeve, Shaft, and Packing. Pumps with Mechanical Seals are easily identifiable by Seal Pots that contain Seal Oil/Lubricant. 100, 33098 Paderborn, Germany. The hardware components within the Stuffing Box perform the important function of minimizing the leakage of "pumped up" process fluid out of the Stuffing Box; without Packing or a Mechanical Seal in the Stuffing Box, leakage would naturally occur since the rotating shaft pierces the Pump Casing. #use of mechanical seal. When that situation exists, an external source of lubricant is delivered into the Stuffing Box and distributed by a Lantern Ring. Without circulating cool Seal Oil/Lubricant through the Mechanical Seal, this interface would fuse and the pump would fail. The hardware components within the Stuffing Box perform the important function of minimizing the leakage of the pumped-up process fluid; without Packing or a Mechanical Seal in the Stuffing Box, leakage would naturally occur since the rotating shaft pierces the Pump Casing. Stuffing box seals are the original type of seal used in centrifugal pumps and were widely used until mechanical seals were developed in the 1930s. e) Bearings worn. Air pocket in suction line 7. The lantern ring provides a point to inject external fluid in order to cool and lubricate the packing and provide better sealing in vacuum services. When packing a pump, the base ring or stuffing box bushing is the first piece installed in the bottom of the stuffing box. Now that PTOA Readers and Students possess a fundamental understanding of "The Pumping Side" of a Centrifugal Pump as well the importance of a pump's auxiliary Lubrication Oil System ... PTOA Readers and Students are well prepared to focus on the form and function of the hardware components that are found on "The Power Side" of a Centrifugal Pumps! Coat each new packing ring with Pak-Lube®, Go-Jo or some type of liquid soap. Then the USA Environmental Protection Agency implemented regulations that advocated for clean water by requiring Mechanical Seals to be installed on new pumps and retrofit onto many pumps in service. Centrifugal pump Components vary in design and construction from simple pumps with relatively few parts to extremely complicated pumps with hundreds of individual parts.

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