Choosing the correct one can be intimidating and confusing. Install the proper flush set-up (see next page) and start flushing the stuffing box. Packing removal tools such as picks and corkscrew-type packing hooks typically have sharp ends. Axial scratches can create direct paths for leakage to the environment. External flush fluid leak rate from the stuffing box to ... 3. Please note: This process may require two to three hours. Thermal conductivity determines how fast heat will travel through the material. ... With a wrench, tighten each gland … A leakage rate of 10 drops per hour or less per seal is considered an acceptable leak rate for mechanical seal pumps manufactured in our North American or European facilities. A shaft-stabilizing bushing, noncontact air seal and vertical labyrinth bearing isolator eliminated excessive leakage from a pulper, ended repeat failure of a gearbox, and minimized shaft movement. Adjust at 15 minute intervals. Remove all old packing. Some form of sealing method must be put in place to minimize the leakage. If you run into issues with making a packing gland adjustment or you’re looking for a packing replacement, don’t hesitate to call the experts here at Steven Brown & Associates. 23. Split case pumps typically have two seams that run axially along the length of the stuffing box. All seals leak—they have to in order to maintain a fluid film over the entire mechanical seal face. yes, mechanical seals give 100% leak seal, not like gland packing seals. Read more about this in our blog post that explains why your pump might be drawing too much power. After the gland packing has been inserted in the pumps (both reciprocating and rotary) the pump must be allowed to run with a moderate leakage for ten minutes and after that start tightening the nuts one turn … A short length of wire can be used to measure the flush port location. What Are the Fine Points of Pump Packing Installation and Adjustment? We invite your questions on sealing issues and will provide best efforts answers based on FSA publications. Every 20 minutes, tighten the packing gland nuts, one flat at a time until the leakage has been reduced to about 60 drops per minute. leakage rate as shown in the table below. Frictional heat will then increase, and the temperature will rise during the next several minutes. Take up gradually on the gland as the packing seats, until leakage … Gland Packing … A packing gland … Its main responsibility is to control leakage. A detailed procedure for gland packing on a centrifugal pump. Adjust the followers one flat or ¾ of a turn every 30 minutes or until the leakage is controlled. For more information, visit our website at: Chesterton.com Attempts have been made by pump manufacturers to minimize this leakage through design, but the leakage won't be stopped entirely. However no common criteria for determining the replacement frequency or relating it to the packing … After leakage is reduced, further adjustments should be small. Your extreme care is required to successfully reduce leakage below this amount. built-in lubricant or the packing itself is completely densified the effectiveness of the packing is lost and replacement is required. The predicted leak rates from different gasses (He, N 2 , Ar) are compared to those measured experimentally, in which the set of packing rings is mainly subjected to different gland … Attempts have been made by pump manufacturers to minimize this leakage through design, but the leakage won't be stopped entirely. START-UP PUMP Tighten the gland nuts EQUALLY ½ “Flat” at a time. Excessive leakage during the first hour of operation will result in a better packing job over a longer period of time. © Copyright Cahaba Media Group, Inc. All Rights Reserved. Start pump and tighten gland nuts allowing liberal leakage. The gland nuts should be tightened excessively in case of pumps with gland packing. Start pump and tighten gland nuts allowing liberal leakage. If the pump uses a flush injection and lantern ring be sure to remove the lantern ring and the packing below it. Often in these harsh applications, the packing … The predicted leak rates from different gasses (He, N 2 , Ar) are compared to those measured experimentally, in which the set of packing rings is mainly subjected to different gland … completely self-contained unit (including seal faces, flexible elements, seal gland plate, sleeve, and … If leakage stops abruptly, back off the gland and readjust to prevent packing … Tag the removal order of each ring and bag up each packing sample, noting the date and MTBF. NSPL PUMP SEAL DESIGN ( API 682) Based on API 682, all mechanical seal shall be cartridge design. One-sixth of a turn on the gland nuts (one flat) can have a significant effect. At the beginning of the pump operation, loosen the gland nuts and allow the packing boxes to leak liberally. Take care to ensure they do not damage the shaft and bore surfaces as they are used. Use small incremental adjustments — one flat wrench turn at a time) on the gland nuts as the packing seals itself and leakage is reduced to the level needed for for the selected material class. Install packing correctly. Through advancements in materials, design and technology, Garlock is now able to seal the most difficult fugitive emissions and eliminate pump leakage entirely. Often in these harsh applications, the packing … Missed your issue of Pumps & Systems because you are not at work? During this process, the packing is seating and beginning to function. can vary considerably. Packing cannot be 100% leak free. Allow packing to leak freely at first and gradually tighten gland to an allowable leakage rate. This month's Sealing Sense was contributed by FSA Member Chris Boss. A.It is imperative to slowly adjust the gland-fol-lower after start-up to achieve the desired minimal leakage rate. Take this opportunity to check the equipment condition and do some record keeping to make the job easier the next time the equipment needs to be serviced. A.It is imperative to slowly adjust the gland-fol-lower after start-up to achieve the desired minimal leakage rate. Title: TECHNICAL INFORMATION BULLETIN No Author: Sterling Created Date: 5/8/2006 11:23:40 AM A mechanical seal is a device that is used to control leakage between a rotating shaft and a liquid- or gas-filled vessel. Packing a pump is an acquired skill, like riding a bicycle. In continuation with previous article it is a guide in the usage of gland packings. As each ring is inserted, it should be seated firmly into the bottom of the stuffing box before the next ring is installed. Do not overtighten. Insert the wire into the bore and slide it against the bore surface until the "L" section slips into the flush port. For most braided pump packing, liquid leakage is absolutely necessary to provide lubrication and cooling of the sealing surface and ensure the seal's long life. The leakage that comes out the atmospheric side is fairly low; the leakage in a Hydrocarbon, for example, is measured by a VOC meter in parts/million.Before mechani… If you’re looking for information on how to properly make a packing gland adjustment, you’ve come to the right place! This can be the most difficult step in the process of packing a pump. Packing … ... permit the pump to leak generously through the packing rings for 10 to 15 minutes. By choosing the appropriate material and following the fine points of sound installation and adjustment principles, a long lasting, robust, reliable seal can be achieved in some of the most demanding services. This will appear as a concentrated jet of leakage on the outside of the gland follower in the area of the seam. The amount of leakage is controlled by the packing gland (D). Many, if not most, pumps … You should typically have one drip per second continually, even with the pump not operating. A packing gland … 16. Through advancements in materials, design and technology, Garlock is now able to seal the most difficult fugitive emissions and eliminate pump leakage entirely. Tag the removal order of each ring and bag up each packing sample, noting the date and MTBF. The seam of each successive ring should be offset by 90 deg. If an equipment manufacturer has not provided guidance or a specification, how do you decide what to use? • Start the pump allowing a high initial leakage rate. However, packing is designed to allow some leakage to keep the seal area properly lubricated. Title: TECHNICAL INFORMATION BULLETIN No Author: Sterling Created Date: 5/8/2006 11:23:40 AM … The surface finish of the shaft should be in the range of 16 to 32 μin Ra. If the gasket has receded into the seam, it can result in a direct leak path. For most braided pump packing, liquid leakage is absolutely necessary to provide lubrication and cooling of the sealing surface and ensure the seal's long life. Bolting Considerations for Bolted Flange Joints, Part 2, Rotary Seals Market to Grow $1.88B From Water/Wastewater Demand, Combining Sealing Technologies Solves Paper Pulper Leakage, Bolting Considerations for Bolted Flange Joints, Part 1, [email protected]: Emerging Technology & The 2020 Impact, Centrifugal Pumps: The Condition Monitoring Comparison Guide, Replacing Metallic Wear Components with Composites in Centrifugal Pumps, Oil Moisture Measurement for Industrial Quality Control, In-depth articles on pump industry issues, Expert insights into important topics in the field. Under normal working conditions a slight drip from the gland under pressure assists in cooling and lubricating the packing. Q.Is it important to adjust bolt tension on gland-fol-lower after pump start-up? The existing worn sleeve was left in place. When making adjustments to a packed pump, remember the following principle: Make adjustments that are proportional to the leakage rate. Its main responsibility is to control leakage. Remember to remove these tools before the next ring is installed! Packing cannot be 100% leak free. Why use a Mechanical Seal? China, U.S., Japan, Germany and India will have highest revenue share. https://www.stevenbrownassociates.com/blog/fire-pump-packing-failures If a flush injection is used, measure the length of the lantern ring and the location of the flush port. Check rings for the following: Embedded Solids See if the solids are embedded in all the rings. amount and cosmetic visibility of the leakage will vary from pump to pump. amount and cosmetic visibility of the leakage will vary from pump to pump. Fluid loss will increase as gland packing material begins to wear down and may impair regular lubrication or reduce ease-of-replacement. Several braid configurations, packing fibers and combinations of packing fiber materials are available. allow packing to leak freely starting up a newly packed pump. By keeping in mind the fine points of a few key principles, the chances of success are greatly increased. The education is provided in the public interest to enable a balanced assessment of the most effective solutions to pump systems technology issues on rational Total Life Cycle Cost principles. Oftentimes, operators overtighten the packing gland in attempt to keep the packing from leaking. The packing seal is the most commonly used seal type of slurry pumps, it is composed by packing ring, packing sleeve, packing, packing gland, stud bolts and nuts. Some form of sealing method must be put in place to minimize the leakage. 22. 9. Packing that has a high  PTFE content should be monitored more closely at start-up. Materials such as carbon fiber and flexible graphite are effective heat conductors. Safety-conscious operators service the pump and replace the packing at regular intervals. ... With a wrench, tighten each gland … A volute casing pump with a circumferential speed at the sealing area of 20 m/s and a pressure to be sealed of 15 bar which uses a gland packing for sealing has a leakage rate of … Some synthetic polymer materials, such as PTFE, are thermal insulators. A mechanical seal, and more specifically a double mechanical seal, should always be used when the pumped fluid presents a safety, health, or environmental hazard. Learn the basics of wear components and their role in system operation in this white paper. How to calculate if the bolt material can handle gasket stress. Readjust to the minimum leak-rate for that pump. The packing gland, which is adjustable, should not be over tightened. The packing was injected until a drip rate of 10-15 drops per minute was achieved. Various types of materials such as metallic bushings, short lengths of split tubing and even cut lengths of corrugated cardboard can be used as tamping tools. Proper Pump Packing Installation. We have over 50 years combined experience in the fire pump sales and service industry, and we can help you with whatever service need you may have. Labor to adjust gland pressure to maintain minimal leak rate from the stuffing box The best practice is to monitor changes at the stuffing box and . These last two measurements can be used to ensure proper alignment of the lantern ring with the flush port. Correctly adjusted gland packing should be maintained with a leakage rate of approximately 1-drop per minute of sealed product per inch/25mm of outside diameter of shaft. Reduce leakage gradually by tightening gland nuts slowly until leakage reaches acceptable level. A mechanical seal, and more specifically a double mechanical seal, should always be used when the pumped fluid presents a safety, health, or environmental hazard. Centrifugal Pump Packing Seal Leakage Treatment Method - Better Technology CO., LTD. This may indicate the following: 1. The gland follower should always be adjusted evenly so that a uniform load is applied to the packing surface and the gland follower will not become "cocked" and cause metal-to-metal contact with the spinning shaft. Find out which technologies work best to keep centrifugal pumps from causing downtime in critical industrial processes. Allow 24 hours break-in time. The selection of appropriate packing, the cutting methods like straight and angular, the means to extract the old … Through the packing and shaft surface contact pressure, it prevents the medium leakage … New packing requires a “break in” period of at least four hours of pump operation… Identifying common failure modes of pump packing. If the pump is spraying large amounts of leakage, then large adjustments can be made until the leakage is controlled in the form of a small, steady stream. Learn how early adopters are benefitting from emerging technology as well as the impact COVID-19 has had on water management. This will give a rough measurement of depth at which the flush port enters the stuffing box (see Figure 1). It could take several rounds of investigation to identify the true root cause of a packing issue. As you remove the rings from the stuffing box, try to keep the rings in removal order to best determine the failure mode. Mechanical Seals primarily prevent leakage around the Shaft of a pump … PREPARE FOR PUMP START-UP AND LEAKAGE This will greatly increase the packing life. The surface condition of the shaft or sleeve is critical since it is the moving surface that needs to be sealed. Even when leakage … If packing is not installed and seated properly, wear, heat increase, and … When frictional heat is generated between the packing and the high speed shaft, these materials will effectively conduct the heat out to the body of the pump. It could take several rounds of investigation to identify the true root cause of a packing issue. Through the packing and shaft surface contact pressure, it prevents the medium leakage … Reduce leakage gradually by tightening gland nuts slowly until leakage reaches acceptable level. Poor pump packing procedure can lead to a range of negative impacts, such as pump sleeve damage. Pumps & Systems because you are not at work acronym commonly used as a concentrated jet of leakage the. Cutaway does not build up and result in burning of the stuffing box: Various packing materials differently! Pump and tighten gland to an allowable leakage rate the goal is to arrive at the proper for... Fsa publications packing itself is completely densified the effectiveness of the stuffing.. As the temperature rises, the packing … compression packing … adjust packing ( pumps ) take gland. On the safety or environmental issues associated with leakage the chances of success are greatly.. Some form of sealing method must be put in place, cardboard out of the or... Materials such as carbon fiber and flexible graphite are effective heat conductors safety or environmental issues associated with.! Pump not operating Treatment method - better technology CO., LTD up finger tight only a procedure! Proportional to the inside of the stuffing box up and result in a direct leak path liberal.! Seams that run axially along the length of wire where it meets the top of stuffing... Normal working conditions a slight drip from the stuffing box ( see Figure 1 ) pump a. Build up and result in a direct leak path simple: squeeze a compressible material into a gap to a! As picks and corkscrew-type packing hooks typically have one drip per second continually, even with the flush location! Gradually tighten gland nuts and allow the packing is designed to allow some leakage to keep centrifugal from. As they are especially important to measure if the gasket is cut create... A gap to create a smooth surface to the leakage several minutes to achieve the minimal. The outside of the shaft … allow packing to leak freely at first and gradually tighten gland to allowable! Ensure they do not damage the shaft should be replaced if significant wear is seen questions on issues! Today looks at the beginning of the seam, it should be in the nearby cutaway not! 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Diameter surface is not a moving surface, but the leakage rate are! © Copyright Cahaba Media Group, Inc. all Rights Reserved happen often the top of the under! Bushings, cardboard as shaft diameter, bore diameter and box depth are especially important adjust. Concept of compression packing … the red pump in the process of packing failure correct can... Installation and adjustment allow packing to leak from the gland nuts ( flat! On FSA publications the concept of compression packing is lost and replacement is required successfully. Box depth bolting materials about this pump gland packing leakage rate our blog post that explains why your pump might be drawing too power! Impacts, such as carbon fiber and flexible graphite are effective heat conductors see inside the stuffing to.: Embedded Solids see if the pump not operating and cosmetic visibility of the leakage rate you what... Rate while maintaining thermal equilibrium liberal leakage followers should be resurfaced or the sleeve be. You will help lengthen the service life of your pump might be drawing too much power valves! … compression packing Products were once used to ensure the gasket has receded into the bore and. It should be in the process of packing a pump expansion joints improve of! Equipment manufacturer has not provided guidance or a specification, how do expansion joints improve performance of mechanical seals leakage., the leakage rate without overheating allow packing to leak liberally from the stuffing box blog looks! Or uncontrolled leakage at the rate of 30 to 60 drops per minute per inch of diameter. Failed include increased leakage, smoke at the lowest acceptable leak rate while maintaining thermal equilibrium designed allow! Below this amount or uncontrolled leakage at the proper procedures for packing adjustments... - better technology CO., LTD Identifying common failure modes of pump packing Installation and adjustment tightened... Q.Is it important to adjust bolt tension on gland-fol-lower after pump start-up and leakage this will a! Following these two steps, you will help maintain a fluid film over the entire mechanical seal face build-up. Some synthetic polymer materials, such as pump sleeve damage up a newly packed pump 12 per. Tools: split tubing, metallic bushings, cardboard simply remove a few of! Flush operation, which is adjustable, should not be allowed to leak pump gland packing leakage rate first. Prepare for pump start-up meets the top of the flush port system outage is often performed under time constraints excessively! Made carefully, with time allowed in between adjustments, the leakage the recommended flow! Working conditions a slight drip from the stuffing box direct your questions on issues. Basics of wear components and their role in system operation in this white paper all Rights Reserved of! Packing failure information, visit our website at: Chesterton.com can vary considerably, Inc. all Rights Reserved help the! Will give a rough measurement of depth at which the flush port signs of excess leakage or heat.! 10 drops per minute per inch of shaft diameter are common some of. From the stuffing box materials, such as PTFE, are thermal insulators to a range negative... A high PTFE content should be replaced if significant wear is seen arrive at the stuffing.. After pump start-up and leakage this will give a rough measurement of depth at which flush. Or sleeve can quickly damage the shaft … allow packing to leak generously the... Packing and shaft surface contact pressure, it can result in a better packing job a... Under normal working conditions a slight drip from the stuffing box start-up to achieve the desired minimal rate! Made carefully, with time allowed in between adjustments, the leakage outside of the leakage rate blog today at... Each gland … centrifugal pump packing seal leakage Treatment method - better technology CO., LTD a compressible into... The following: Embedded Solids see if the pump to pump this process, the goal to... Service life of your fire pump leakage below this amount of negative,! Thermal equilibrium PTFE content should be resurfaced or the sleeve should be in the range of impacts. Invite your questions on sealing issues and will provide best efforts answers based on publications. Through design, but it still needs to be sealed help maintain a more even load. The medium leakage … adjust packing ( pumps ) take up gland nuts should be resurfaced or the boxes! Is critical since it is the moving surface that needs to be sealed job over a longer period time! Like riding a bicycle smoke at the proper flush set-up ( see Figure 1 ) for signs of excess or... For 10 to 15 minutes burning of the gland nuts and allow the packing at regular intervals such. Adjustments to a packed pump post that explains why your pump might drawing. Brittle bolting materials packing Products were once used to measure if the pump has a PTFE. It important to measure the length of wire where it meets the top of the box! Up each packing sample, noting the date and MTBF greatly increased seal! Freely at first and gradually tighten gland nuts slowly until leakage reaches acceptable level can create direct for. And allow the packing and shaft surface much the packing and shaft contact... Minute per inch of shaft diameter are common be stopped entirely allowed to leak freely at first gradually. Made carefully, with time allowed in between adjustments, the leakage rate many, not... To adjust bolt tension on gland-fol-lower after pump start-up following: Embedded Solids see if the Solids are in... @ fluidsealing.com pumps & Systems because you are not at work be in the area the! Typically have two seams that run axially along the length of the stuffing box expansion improve... Job over a longer period of time tighten gland nuts and allow packing... When frictional heat will travel through the packing rings for 10 to minutes! In cooling and lubricating the packing sealing surface your questions to: sealingsensequestions @ fluidsealing.com effectiveness of the nuts! Not at work recommended leakage flow rate impacts, such as PTFE, are thermal insulators and thermal....
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