When that situation exists, an external source of lubricant is delivered into the Stuffing Box and distributed by a Lantern Ring. Below is another photo of the same Shaft that is shown above. Pump Bearings. Explaining the form and function of Packing in a Stuffing Box is best done via You Tube! Pump Draws Too Much Power (current) • Speed too high. A stuffing box separates the non-rotating parts from those that rotate. When cutting gaskets for horizontal split pumps, cut bolt hole openings on head and split gasket lengthwise. Note a small amount of oil drips out of the Stuffing Box of the Pump. See how the black, braided fiber Packing Rings and the bronze Lantern Ring encircle the Shaft Sleeve? The Benefits of Mechanical Seals Over Packing. In the above photo the exterior Casing of both "The Pumping Side" of the pump and the Stuffing Box are both painted blue ... so its kind of hard to distinguish the difference. The red line in the Casing shows where the lube oil is allowed to flow into the Stuffing Box. Just like Packing Rings, Lantern Rings rotate with the Shaft. Install Mechanical Seal into Stuffing Box in Viking Pump Universal Seal Pump - Duration: 3:03. American Seal and Packing is a leading manufacturer & distributor of mechanical seals, Grafoil, gasket material, cut … The area between the stuffing box and bearing bracket is left open to allow for inspection and adjustment of packing. It is used to prevent leakage of fluid being pumped between rotating parts and stationary parts or machine elements. The … Air pocket in suction line 7. But gradually for maintaining 5-6 LPM I had to increase the supply pressure to 20 kg/cm2, means the stuffing box … Pumps with Mechanical Seals are easily identifiable by Seal Pots that contain Seal Oil/Lubricant. I have a between bearing two stage centrifugal pump with plan-32 and plan-52 mechanical seal plans. 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. They don't! 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. It is found on the outside of the back plate of the pump thru which the rotation pump shaft … While watching the video, be on the lookout for these features: PTOA Readers and Students who are reading the PTOA Segments in the intended sequential order expertly understand why the rotating/sliding parts in the above You Tube must be lubricated. The below pump is clearly exhibiting too much leakage! The contractor is responsible for ensuring all pumps meet applicable codes and must add packing for firewater pumps if this is required. ", So that must mean a "You Tube is worth a million words!". 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. How does the lubricant get into the Pump Casing? Lantern Rings are strategically located below an opening in the Casing through which lubrication oil flows into the Stuffing Box. PTOA PV Pressure Rotating Equipment Focus Study, The Process Technology and Operator Academy, red drops oozing out of the Stuffing Box in the nearby pump schematic, light blue coloring defines rotating hardware components, The gray surfaces are stationary hardware components, PTOA Process Variable Pressure Focus Study Area, PTOA PV Pressure Rotating Equipment Focus Study, Fundamentals of increasing Pressure and Energy in Liquids, Making Fluids move around, build pressure and gain energy, Making Things People Want While Also Keeping Air and Water Clean, The nearby graphic of a single stage Centrifugal Pump  ... and. The real world photograph below the graphic which could represent the same single stage Centrifugal Pump installed at a facility. of bore . The Chesterton video gets relevant to Process Operators around minute 3 and a half  ... so hang in there! 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! All packed pumps still leak. The Shaft is attached to the Impeller and extends through the Stuffing Box in the middle and Bearing Box on the left. … new end suction centrifugal pumps 2004-3 page 11 october 1975 general data type cng, cngk types cng cngk frame size shaft diameter , size of keyway at coupling impeller overhang bearing span skf bearing. I'm fixing a hole where the rain gets in Generally speaking, centrifugal pumps … The nearby cutaway graphic of a Centrifugal Pump shows: The Stuffing Box Housing in the nearby real life photograph is likewise situated in the same relative position as the cutaway schematic shown above. It consists of a stuffing box cavity with a restrictive “throat” bushing at the pumpage end, several rings of packing, a hollow spacer or lantern ring, several more rings of packing and a follower or gland. 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. A stuffing box of a pump houses a gland that compresses the packing used to seal the pumped fluid. When packing a pump, the base ring or stuffing box bushing is the first piece installed in the bottom of the stuffing box. Heck! Where it will go. TAKE HOME MESSAGES: The interior of the Stuffing Box is a cavity where the Shaft pierces the Pump Casing. Thoroughly clean and inspect the stuffing box. This drip, drip, drip of liquid is shown as the red drops oozing out of the Stuffing Box in the nearby pump schematic. The gray surfaces are stationary hardware components. Mechanical Seals are replacing Packing in Pumps. When centrifugal pumps were developed there was a need to prevent the pumpage from pouring out thru the open clearance between the pump … size of packing diam. Thanks again to API for providing an animated graphic that illustrates how the Seal Oil circulates through a Seal Pot ... and how the heat transferred into the Seal Oil is exchanged with cooling water so that cool lubricant/Seal Oil is returned to the Mechanical Seal. Sometimes, the Centrifugal Pump is designed to allow the "pumped up" process liquid to intentionally leak back into The Stuffing Box for the purpose of continuously lubricating the Packing. 100, 33098 Paderborn, Germany. The only service for which packing may be required is firewater pumps. Some pumps use the "pumped up" liquid as a lubricant and some use an external source of lubrication/seal oil that flows into the pump Casing and onto a Lantern Ring. The smooth, brass Lantern Ring in the nearby photo is surrounded by the dark, braided fiber Packing Rings. 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. 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. It is also easy to see The Stuffing Box ... the area behind the Impeller that includes all the important hardware that is needed to prevent leakage of the "pumped up" process liquid out of the Stuffing Box. Packing is made from braided fibers that: A Shaft Sleeve is a cylinder of metal that protects the Shaft so that the Shaft does not endure the friction caused by Packing. The ring-shaped Stationary Seal does not rotate with the Shaft and is made out of a non-galling material like carbon. Required fields are marked *, Address : Warburger Str. Different sealing methods are used to prevent the leakages at the point where the shaft penetrates in the pump … A slight continuous leakage is required between the packing and shaft for lubrication. A secondary line of defense against leaking is created by an O-Ring that rotates with the Rotating Seal Ring, thus making a tight seal between the Rotating Seal and the Shaft. The gold Enclosed Impeller is on the right. Stuffing Box: Centrifugal Pump must be designed properly to control the amount of liquid that leaks along the pump shaft at the point where the pump shaft penetrates the casing. Never use Anti-Seize or any metallic based compound on the pump … Leave stuffing box … Do NOT … Fewer unplanned pump shutdowns for maintenance. 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. Without circulating cool Seal Oil/Lubricant through the Mechanical Seal, this interface would fuse and the pump would fail. Normally I set plan-32 flushing fluid flow at 5-6 LPM, 12Kg/Cm2. Remove all of the used pump packing rings and the lantern ring. 6. Stuffing box pressure is almost always higher than the suction pressure of the pump. Compared to packing, mechanical seals offer the following benefits: Packing is no longer recommended for hydrocarbon services primarily due to the continuous leakage required. 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. It consists of a stuffing box cavity with a restrictive “throat” bushing at the pumpage end, several rings of packing, a hollow spacer or … #New installation of mechanical seal for the centrifugal pump. A stuffing box is an assembly which is used to house a gland seal. It prevents leakage along the shaft that passes through a hole in the pump. Chesterton Company for providing the below 8.5 minute video which features replacing Packing in a Stuffing Box. Despite its simplistic appearance, it plays a crucial role in the successful operation of a pump system. It is used to prevent leakage of fluid, such as water or steam, between sliding or turning parts of machine elements. The packed stuffing box is the simplest type of shaft seal, Figure 1D. A schematic of a single stage Centrifugal Pump that matches the picture of a single stage Centrifugal Pump below.. A picture of a Single Stage Centrifugal Pump that matches the schematic of a Single Stage Centrifugal Pump shown above. A Spring (or Metal Bellows) provides the tension that keeps the Rotating Seal in place so it can't move up and down the spinning Shaft. 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! Stuffing Boxes When you hear stuffing it usually means stuffing for turkeys, it may also suggest some misconceptions about stuffing boxes for pumps. Calculate Stuffing Box Pressure. Why doesn't the interface between the blue and gray hardware components that are touching each other fuse together? • The impeller is fastened to the shaft. When an outside source of lubrication is required to lubricate Packing, a Lantern Ring is installed within the Packing. Where does the spent lubricant/process fluid go in this type of pump design? Wearing Rings Centrifugal pumps contain rotating impellers within stationary pump … Please enable JavaScript on your browser to best view this site. The Chesterton Video showed the "allowable leakage" from the Stuffing Box of a real, working industrial pump. This regulation is yet another example of a regulation everybody lives better with! Some of the most common components found in centrifugal pumps are wearing rings, stuffing boxes, packing, and lantern rings. 5. Some Centrifugal Pump designs pipe a small stream of "pumped up" liquid from the Pump Discharge Line directly into the lubrication access hole in the Pump Casing. f) Pump and drive unit misaligned. 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. symbols t stuffing box ' -rings per box . All centrifugal pumps have a … When the pump is in good repair, the high pressure stuffing box is … 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. Hey! e) Bearings worn. MOVING ON TO "THE POWER SIDE" OF THE CENTRIFUGAL PUMP. The different options available are stuffing boxes to accommodate: • Shaft packing • Single mechanical seal • OlympiaTM Double mechanical seal with barrier fluid The packed box … As long as the seal faces stay clean, smooth, and lubricated they will eliminate virtually all leakage between the shaft and the wall of the stuffing box. That "open area" is where The Shaft is extending from the Stuffing Box Casing and into the Bearing Housing. 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 diagram shows the main parts of the centrifugal pump. Liquid from behind the impeller will be circulated through the stuffing box to the pump suction. Packing must be lubricated; the heat of created friction must be removed via lubrication. ©2018 PTOA Segment 0181 PTOA Process Variable Pressure Focus Study Area A Lantern Ring is just a metal ring with holes in it that allow the lubricant flow onto the Shaft Sleeve, Shaft, and Packing. Air leaks in suction line 8. In real life they are more complicated. • The shaft passes through the pump casing and out through the stuffing box (portion of the casing through … Replace worn shaft sleeve if needed. 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. • Wrong direction of rotation. Greatly reduces pump leakage when the pump operates at extreme PV Pressure or PV Temperature. Lantern Rings are metal rings with holes that distribute lubricant to the Packing, Shaft Sleeve, and Shaft. There simply isn't sufficient space between the two flat surfaces to leak through! The Centrifugal Pump with Stuffing Box Learning System (95-PM1-H) covers a pump design that, in spite of the modern mechanical seal, remains widely used in industry due to its cost-effectiveness and ability to avoid catastrophic failure. Packing will decrease leaking to a controlled minimum ...  but there is still a constant drip, drip, drip of liquid from the Stuffing Box. The purpose of this bushing is to prevent packing from extruding through the bottom of the stuffing box. The right side photo below is a cutaway of a pump with Packing that is lubricated by the "pumped-up" process liquid. Process Operators are not expected to replace the Packing in the Stuffing Box of a Centrifugal Pump; that's the job of the Mechanics and Mechanic Techs. And now all PTOA Readers and Students know the form and function of "the stuff" found in a Centrifugal Pump's Stuffing Box! The benefits of Mechanical Seals over fiber Packing also include: Basic Mechanical Seal Hardware Components. Proper Pump Packing Installation. The red pump in the nearby cutaway does not have rows and rows of Packing in the Stuffing Box. JAVASCRIPT IS DISABLED. Pump or suction pipe not completely filled with liquid 3. The interfaces between light blue and gray touching surfaces would most certainly heat up and fuse in a Mechanical Seal. Coat each new packing ring with Pak-Lube®, Go-Jo or some type of liquid soap. A "Stuffing Box" might be called a "Packing Box… The Shaft is attached to the backside of the Impeller. The final part of the mechanical end is the bearing arrangement. The Stuffing Box is adjacent to the Pumping Side Casing. Thanks to the A.W. Cut the rest of the gasket on the case with all the slack in the boltholes pulled to the outside edges. Access the Chesterton Video HERE ... or access the You Tube directly below. a) Shaft bent. • Head lower than rating, pumps too much water. Centrifugal pumps with stuffing boxes perform the same function as any centrifugal pump… Regardless of whichever pump lubrication design is used, the Outside Process Operator must constantly determine whether or not the leakage rate from the Stuffing Box of a Centrifugal Pump is as expected. . The basic components of a Mechanical Seal. Ropes of Packing are cut into rings made of two semi circles. Way back in PTOA Segment #163, PTOA Readers and Students were introduced to ... those same brilliant PTOA Readers and Students ... who have been reading the PTOA Segments in the intended sequential order ... have a far better understanding of the form and function of the hardware components found within "The Pumping Side" of a Centrifugal Pump compared to many, many currently working Process Operators! That's because all PTOA Readers and Students who are reading the PTOA Segments in the intentional sequential order expertly understand that the friction created by a rotating surface rolling by a stationary surface would generate mucho heat. A Lantern Ring is shown in the above left photo. And stops my mind from wandering The Shaft extends from the Stuffing Box into the Bearing Housing. And that area of the Pump adjacent to the pierced pump Casing is called the Stuffing Box.
2020 stuffing box centrifugal pump