It could take several rounds of investigation to identify the true root cause of a packing issue. As each ring is inserted, it should be seated firmly into the bottom of the stuffing box before the next ring is installed. Chapter 4 Fire Pumps 89 Program for Individual Systems Suction piping shall be fl ushed at a fl ow rate not less than indicated in Table 14.1.1.1(a) [Exhibit 4.1] and Table 14.1.1.1(b) [Exhibit 4.2] of NFPA … They are especially important to measure if the pump has a history of problems maintaining proper flush operation. Overtightening is the most common cause of packing … Some form of sealing method must be put in place to minimize the leakage. Pingback: Fire Pump Packing Failures | Steven Brown & Associates, Hubbell Launches a New Line of Metron Fire Pump Controllers, Fire Pump Packing Failures | Steven Brown & Associates, Future Safety Features in Fire Pump Controllers – Master Controls, Check out this Impressive Fire Pump System Installation, Get Comprehensive Fire Protection in a Packaged Pump House. This decision focuses on the safety or environmental issues associated with leakage. USING PACKING AS A SEAL. As the temperature rises, the material will expand and result in a tightening and further reduction of the leakage rate. Adjusted too tight, the packing dries out, heats up and usually causes a scored shaft, which then produces a rapid rate of packing wear. Start pump and tighten gland nuts allowing liberal leakage. A packing gland … Allow packing to leak freely at first and gradually tighten gland to an allowable leakage rate. Do not increase heat. ... After the break-in period, the leakage rate … This will give a rough measurement of depth at which the flush port enters the stuffing box (see Figure 1). 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. If a flush injection is used, measure the length of the lantern ring and the location of the flush port. A short length of wire can be used to measure the flush port location. Choosing the correct one can be intimidating and confusing. What are the best practices for sealing equipment with high thermal expansion? If adjustments are made carefully, with time allowed in between adjustments, the packing can reach an acceptable leakage rate without overheating. amount and cosmetic visibility of the leakage will vary from pump to pump. They typically require higher leakage rates so the frictional heat does not build up and result in burning of the packing. Many, if not most, pumps … USING PACKING AS A SEAL. PREPARE FOR PUMP START-UP AND LEAKAGE This will greatly increase the packing life. Signs that the packing has failed include increased leakage, smoke at the stuffing box or uncontrolled leakage at the gland. packing, pump housing and process fluid. Even when leakage … If adjustments are made too quickly, frictional heat may build to a point where it spirals out of control and causes the packing to fail. Packing … 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 … Mechanical seals are more durable than their predecessors and use multiple sealing points to nearly eliminate any leakage … Leakage control can be complicated at these pressures because small adjustments of the gland bolts can cause drastic changes in leak rate and, subsequently, the frictional heat and operating temperature of the packing set. This may indicate the following: 1. Why use a Mechanical Seal? 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. These last two measurements can be used to ensure proper alignment of the lantern ring with the flush port. All seals leak—they have to in order to maintain a fluid film over the entire mechanical seal face. Centrifugal Pump Packing Seal Leakage Treatment Method - Better Technology CO., LTD. In continuation with previous article it is a guide in the usage of gland packings. Centrifugal Pump Packing Seal Leakage Treatment Method - Better Technology CO., LTD. ... permit the pump to leak generously through the packing rings for 10 to 15 minutes. 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. If packing is not installed and seated properly, wear, heat increase, and … 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. Reduce leakage gradually by tightening gland nuts slowly until leakage reaches acceptable level. Adjust the followers one flat or ¾ of a turn every 30 minutes or until the leakage is controlled. Split case pumps typically have two seams that run axially along the length of the stuffing box. After leakage is reduced, further adjustments should be small. The initial cost of Gland (Pump) Packing is low when compared to the costs associated with mechanical seal. Proper Pump Packing Installation. The bore diameter surface is not a moving surface, but it still needs to be sealed. The selection of appropriate packing, the cutting methods like straight and angular, the means to extract the old … Axial scratches and pitting on the shaft or sleeve can quickly damage the sealing surface. When adjusting pump packing, the goal is to arrive at the lowest acceptable leak rate while maintaining thermal equilibrium. Materials such as carbon fiber and flexible graphite are effective heat conductors. PTFE fibers or coatings exhibit relatively high thermal expansion. completely self-contained unit (including seal faces, flexible elements, seal gland plate, sleeve, and … 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. Repacking equipment during a system outage is often performed under time constraints. Oftentimes, operators overtighten the packing gland in attempt to keep the packing from leaking. The opportunity to see inside the stuffing box does not happen often. All seals leak—they have to in order to maintain a fluid film over the entire mechanical seal face. During this process, the packing is seating and beginning to function. If packing is not installed and seated properly, wear, heat increase, and … Through advancements in materials, design and technology, Garlock is now able to seal the most difficult fugitive emissions and eliminate pump leakage entirely. Identifying common failure modes of pump packing. Check for signs of excess leakage or heat build-up. replace the packing … https://www.stevenbrownassociates.com/blog/fire-pump-packing-failures Insert the wire into the bore and slide it against the bore surface until the "L" section slips into the flush port. A detailed procedure for gland packing on a centrifugal pump. Poor pump packing procedure can lead to a range of negative impacts, such as pump sleeve damage. can vary considerably. Adjust the gland follower by turning the nuts 1/6 of a turn, one flat at a time, every fifteen minutes until you achieve an … The seam of each successive ring should be offset by 90 deg. leakage rate as shown in the table below. START-UP PUMP Tighten the gland nuts EQUALLY ½ “Flat” at a time. Often in these harsh applications, the packing … built-in lubricant or the packing itself is completely densified the effectiveness of the packing is lost and replacement is required. ... With a wrench, tighten each gland … Title: TECHNICAL INFORMATION BULLETIN No Author: Sterling Created Date: 5/8/2006 11:23:40 AM Check rings for the following: Embedded Solids See if the solids are embedded in all the rings. 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… Do not overtighten. External flush fluid leak rate from the stuffing box to ... 3. The red pump in the nearby cutaway does not have rows and rows of Packing in the Stuffing Box. China, U.S., Japan, Germany and India will have highest revenue share. Often in these harsh applications, the packing … 10. It could take several rounds of investigation to identify the true root cause of a packing issue. Garlock compression packing … Your extreme care is required to successfully reduce leakage below this amount. NSPL PUMP SEAL DESIGN ( API 682) Based on API 682, all mechanical seal shall be cartridge design. 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. 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… If leakage stops abruptly, back off the gland and readjust to prevent packing … We invite your questions on sealing issues and will provide best efforts answers based on FSA publications. Frictional heat will then increase, and the temperature will rise during the next several minutes. allow packing to leak freely starting up a newly packed pump. When frictional heat is generated, these materials tend to retain the heat and concentrate it near the shaft surface. Allow 24 hours break-in time. Through advancements in materials, design and technology, Garlock is now able to seal the most difficult fugitive emissions and eliminate pump leakage entirely. Packing that has a high  PTFE content should be monitored more closely at start-up. Take care to ensure they do not damage the shaft and bore surfaces as they are used. Resist the temptation to simply remove a few rings of packing that are near the top of the stuffing box. Several braid configurations, packing fibers and combinations of packing fiber materials are available. Several minutes should pass before the next adjustment is made. This will help maintain a more even compressive load throughout the depth of the packing set. Turn on the gland water for a few minutes, then run the pump for about 30 minutes. Two key material properties determine how a packing will respond to compressive adjustment: thermal conductivity and thermal expansion. Take up gradually on the gland as the packing seats, until leakage … © Copyright Cahaba Media Group, Inc. All Rights Reserved. Gland followers should be adjusted at regular intervals to maintain the recommended leakage flow rate. 9. 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… Under normal working conditions a slight drip from the gland under pressure assists in cooling and lubricating the packing. 9. As you remove the rings from the stuffing box, try to keep the rings in removal order to best determine the failure mode. A mechanical seal is a device that is used to control leakage between a rotating shaft and a liquid- or gas-filled vessel. … Install the proper flush set-up (see next page) and start flushing the stuffing box. 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. Tag the removal order of each ring and bag up each packing sample, noting the date and MTBF. yes, mechanical seals give 100% leak seal, not like gland packing seals. Title: TECHNICAL INFORMATION BULLETIN No Author: Sterling Created Date: 5/8/2006 11:23:40 AM 23. For more information, visit our website at: Chesterton.com Check rings for the following: Embedded Solids See if the solids are embedded in all the rings. Through the packing and shaft surface contact pressure, it prevents the medium leakage … Shaft Diameter Suggested Leakage Rates Replace packing when leakage can not be controlled by further take up of the gland. Install packing correctly. Its main responsibility is to control leakage. By keeping in mind the fine points of a few key principles, the chances of success are greatly increased. Install packing correctly. However, packing is designed to allow some leakage to keep the seal area properly lubricated. 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. Packing a pump is an acquired skill, like riding a bicycle. 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. The testing characteristics of ductile and brittle bolting materials. The amount of leakage is controlled by the packing gland (D). A packing gland … amount and cosmetic visibility of the leakage will vary from pump to pump. • After running the packing in for 15-30 minutes, begin tightening the gland nuts one flat at a time until the desired leakage … built-in lubricant or the packing itself is completely densified the effectiveness of the packing is lost and replacement is required. Packing should be cut into individual rings so that the cut ends come together without a gap when they are inserted in the stuffing box. Adjust packing (Pumps) Take up gland nuts until finger-tight. Gland Packing … If the pump uses a flush injection and lantern ring be sure to remove the lantern ring and the packing below it. Fluid loss will increase as gland packing material begins to wear down and may impair regular lubrication or reduce ease-of-replacement. After the break-in period, the leakage rate can be controlled to 10 to 12 drops per minute per inch of shaft sleeve diameter. 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. Leakage control can be complicated at these pressures because small adjustments of the gland bolts can cause drastic changes in leak rate and, subsequently, the frictional heat and operating temperature of the packing set. Figure 2. This cools the shaft … The shaft should be resurfaced or the sleeve should be replaced if significant wear is seen. On a 2.000”/50mm diameter … In this position, mark the length of wire where it meets the top of the stuffing box. This will appear as a concentrated jet of leakage on the outside of the gland follower in the area of the seam. A.It is imperative to slowly adjust the gland-fol-lower after start-up to achieve the desired minimal leakage rate. Protecting assets with real-time condition data. Built-in lubricants are gradually . Readjust to the minimum leak-rate for that pump. By following these two steps, you will help lengthen the service life of your pump. Shaft Diameter Suggested Leakage Rates Replace packing when leakage can not be controlled by further take up of the gland. Cost of Product. Leakage control can be complicated at these pressures because small adjustments of the gland bolts can cause drastic changes in leak rate and, subsequently, the frictional heat and operating temperature of the packing set. Axial scratches can create direct paths for leakage to the environment. A detailed procedure for gland packing on a centrifugal pump. Remove all old packing. Check to ensure the gasket is cut to create a smooth surface to the inside of the stuffing box. One-sixth of a turn on the gland nuts (one flat) can have a significant effect. Feel the packing gland (be careful of the rotating shaft) to see if the packing gland is too … 22. The existing worn sleeve was left in place. This month's Sealing Sense was contributed by FSA Member Chris Boss. Overtightening is the most common cause of packing failure. 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. ... install the gland follower and run the gland nuts up finger tight only. Attempts have been made by pump manufacturers to minimize this leakage through design, but the leakage won't be stopped entirely. Establishing the Proper Flush Set-Up In order to establish the proper flush set-up, you … Tamping tools: split tubing, metallic bushings, cardboard. • Start the pump allowing a high initial leakage rate. Safety-conscious operators service the pump and replace the packing at regular intervals. Missed your issue of Pumps & Systems because you are not at work? Please direct your questions to: sealingsensequestions@fluidsealing.com. Read more about this in our blog post that explains why your pump might be drawing too much power. The surface condition of the shaft or sleeve is critical since it is the moving surface that needs to be sealed. Garlock compression packing … 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 … This can be the most difficult step in the process of packing a pump. 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 … Thermal expansion determines how much the packing material will grow when it is heated. Compression Packing Products were once used to seal visible leakage in valves and control leakage in pumps. As cited in the Compression Packing Technical Manual published by the Fluid Sealing Association (FSA), the acronym STAMPS can be used to rememb… The gland nuts should be tightened excessively in case of pumps with gland packing. Some synthetic polymer materials, such as PTFE, are thermal insulators. Packing removal tools such as picks and corkscrew-type packing hooks typically have sharp ends. 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 … What Are the Fine Points of Pump Packing Installation and Adjustment? If you’re looking for information on how to properly make a packing gland adjustment, you’ve come to the right place! Overtightening packing is the most common cause of failure. How to calculate if the bolt material can handle gasket stress. 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. A.It is imperative to slowly adjust the gland-fol-lower after start-up to achieve the desired minimal leakage rate. The packing was injected until a drip rate of 10-15 drops per minute was achieved. When adjusting pump packing, the goal is to arrive at the lowest acceptable leak rate while maintaining thermal equilibrium. Some form of sealing method must be put in place to minimize the leakage. Allow 24 hours break-in time. There are two principal paths that leakage can take out of the stuffing box: Various packing materials respond differently to adjustment. Poor pump packing procedure can lead to a range of negative impacts, such as pump sleeve damage. Our blog today looks at the proper procedures for packing gland adjustments which will help extend the service life of your fire pump. This decision focuses on the safety or environmental issues associated with leakage. 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. After adjustment, the leakage rate will usually be reduced. 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. Take up gradually on the gland as the packing seats, until leakage … Leakage control can be complicated at these pressures because small adjustments of the gland bolts can cause drastic changes in leak rate and, subsequently, the frictional heat and operating temperature of the packing set. However no common criteria for determining the replacement frequency or relating it to the packing … completely self-contained unit (including seal faces, flexible elements, seal gland plate, sleeve, and … Results: After a week of installation, the pump was inspected for leakage, and the drip rate was below 10-15 drops per minute without pump … 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, Water@Work: 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. Do not overtighten. When making adjustments to a packed pump, remember the following principle: Make adjustments that are proportional to the leakage rate. Sealing Sense is produced by the Fluid Sealing Association as part of our commitment to industry consensus technical education for pump users, contractors, distributors OEMs, and reps. As a source of technical information on sealing systems and devices, and in cooperation with the European Sealing Association, the FSA also supports development of harmonized standards in all areas of fluid sealing technology.
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