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</body></html>";s:4:"text";s:35295:"CASE STUDY ON MECHANICAL SEAL DURING COMMISSIONING OF NSPL PUMP AFTER MOH. Experts … Lubrication selection guidelines Most pumps are lubricated with rust and oxidation inhibited oils (R&O) that also have small amounts of antifoam and demulsifier additives. © © 2020 Highlands Publications, Inc. All Rights Reserved. A mechanical seal or compressed packing is used to prevent liquid under pressure inside the pump from leaking out of the pump to atmosphere. Long ago, companies didn’t want to switch to mechanical seals because of the complicated installation and need to completely disassemble the equipment. This article teaches you how to replace the mechanical seal. The pumping fluid is hot water. A seal leak that develops after some period of use is normally caused by an application related factor. Application Data Sheet Pipeline Leak Detection Description: Flow and liquid level detection in drain line systems. Your pump seal is probably to blame. While mechanical seals can range in price from $6,000 to $40,000, stuffing boxes range from $500 to $3,000, depending on shaft size. It has two basic components: A stationery ring that is secured in the seal … For reference to dual systems, you need an auxiliary fluid to act as a barrier that prevents contamination or process fluid from spilling into the environment. A seal with defects in the face or other components will typically leak at startup. A thin layer of the pumped liquid is always between the two faces to lubricate and cool the seal. If all conditions … 0000004223 00000 n
Have you chosen the correct facing combinations? Read on for a basic understanding of mechanical seals, and how they differ from packing. These devices preserve the integrity of the pump systems by preventing fluid leaks and keeping contaminants out. Depending on the pump type and the process variables, … Frank Rotello is mechanical seal reliability engineer for Cummins-Wagner. The mechanical seals help sealing the rotating part of the shaft against the stationary part of the pump housing. x�b```e``z�����������b�@̱P@��9g R'"���L�����"�q"DΠf���4 ���fIcc��n b`�6��A,�d�c�2 :ā���-� K+�2�;
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Is it grouted properly? 0000001649 00000 n
Due to the rotation of the impeller, centrifugal force generates, and vacuum is created. Your springs should not be clogged or your bellows corroded. All the suction/discharge and bypass piping needs to be engineered correctly as well, especially if some pipes have been repaired at some point over the years. And last, check the bearings. The causes of centrifugal pump mechanical seal leakage are analyzed as follows: 1.Leakage during static pressure test (1) The sealing end face is damaged, deformed or damaged during installation. %PDF-1.4
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Seal reliability is greatly affected by the seal design and the operating environment. Before mechanical seals were developed, engineers typically sealed a pump with mechanical packing. Seal Failure Is Usually An Indication of Problems Other Than The Mechanical Seal. What about the seal face material quality? The flow then exits through the discharge, at which point the pressure is high but the velocity slows. Mechanical Seal in a Centrifugal Pump – Mechanical seals are the new age sealing product replacing gland packing and old designs associated with it. Leak during test run. 2. When you operate the pump outside that region, you create problems with the flow that cause the system to fail. Failed packing can be a sign that the wrong packing is being used for the application or other possibilities ranging from excessive gland load to inadequate flush. Leak during test run. An eroded, worn, or fretted dynamic o-ring (or gasket) as the mechanical seal moves. … Given the general geometry of a mechanical seal, anywhere that there’s a gasket or an o-ring, there ensues a potential leak point: If the centrifugal pump exhibits an uncontrolled leak, you must thoroughly check all potential causes to determine if you need repairs or a new installation. The impeller screws from the pump shaft on motor shaft CCW as looking at the pump end. CP’s ceramic lined double mechanical seal centrifugal pump is engineered to meet the most stringent quality standards and ensure reliability and utmost safety in production opera-tions. Mechanical packing, a fibrous material usually impregnated with a lubricant such as graphite, was cut into sections and stuffed down what was called a “stuffing box.” A packing gland was then added to the backside in order to pack everything down. The most effective method of preventing the leakage of the fluid from the centrifugal pump to the external surroundings is using the mechanical seals. MECHANICAL SHAFT SEALS Liquid leaking from the pump castings or seal area may be caused by one of the following: - casting porosity or defect I recently attended the Turbomachinery and Pump Symposium, produced by the Texas A&M Turbomachinery Lab. Other miscellaneous factors account for only about 8 percent of all failures. Tag the removal order of each ring and bag up each packing sample, noting the date and MTBF. MECHANICAL SHAFT SEAL A mechanical shaft seal consists of two main components: a rotating part and a stationary part. During the test run, the pump is not filled with water or the external water supply is not opened to the machine to start the pump operation, or the water is running during use; the pump is checked. It has a shaft that spins at great speed and rotates an impeller. There simply isn't sufficient space between the two flat surfaces to leak … Mechanical Seals and Packed Shaft Seals. Mechanical seals are used in centrifugal pumps to keep water or any liquid from making contact with the delicate parts of the machine. If the pump has a motor, on the backside of the motor the shaft has either a screwdriver slot or double flats for holding the shaft during impeller removal. Mechanical seals are critical components in centrifugal pump systems. Mechanical seals vs. pump packing? centrifugal pump sealing applications, active lift technology is one of the most promising. Long ago, companies didn’t want to switch to mechanical seals because of the complicated installation and need to completely disassemble the equipment. 0000004933 00000 n
Rings of ceramic, carbide, carbon or composites of these materials are lapped flat in the range of less than 1 micron on an axial end face. Other times, failure is a result of poor selection or installation errors. Determining the point of failure is achieved by routine monitoring of the seal. Due to the rotation of the impeller, centrifugal force generates, and vacuum is created. Operating Dead-Headed: If you set the control valve too low to throttle the pump, you can choke the flow. The pump was started again to see if the seal leaks during running but it did not. A centrifugal pump uses the principle of centrifugal force to move water through plumbing systems and hoses. That water, necessary to lubricate and cool the shaft, will leak either into the process or into the atmosphere. The two seal faces mate together to form a barrier between the liquid inside the pump and the air outside. No Water Delivered. Tips to prevent Mechanical Seal Leakage in a Centrifugal Pump. prevent the flush water from collecting on the floor (overspray), which is both an OSHA concern and a housekeeping concern. 0000000910 00000 n
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A mechanical seal is a device that is used to control leakage between a rotating shaft and a liquid- or gas-filled vessel. However, for most users, addressing one of the first four categories will hold the solution they need. Its main responsibility is to control leakage. Tips to prevent Mechanical Seal Leakage in a Centrifugal Pump. A mechanical seal is a device that uses the centrifugal force to push water through the hoses and plumbing system. … The pump imparts head (or pressure), which means it increases the energy of the pump fluid. You need to take the Length of Straight Pipe at Suction into account—some older pump systems that often came as a packaged skid include a 90º elbow at suction right before the flow enters the impeller eye. where a rotating shaft passes through a stationary housing or occasionally, where the housing rotates around the shaft. Every centrifugal pump must accommodate a spinning shaft while mechanically maintaining fluid or gas contained in the “wet end” of the pump. Which is the best and most effective sealing technology for your pump or agitator application? Mechanical seal After a static test, high-speed rotation during operation to produce centrifugal force, will inhibit the fluid leakage. ALLOWING THE PUMP TO RUN DRY Allowing your pump to run dry can be very damaging to a mechanical seal. There simply isn't sufficient space between the two flat surfaces to leak … Seals are ubiquitous, in industry, the home, transport and many other places. Since the packing is in direct contact with the shaft, it requires lubrication, but will still rob horsepower. It has a shaft that spins at great speed and rotates an impeller. Corpus ID: 34398568. Seal leak can be It reduces leakage between the pump and the surroundings to an absolute minimum. We have pumps for every industry and application, and the experience to help you make the best decision. However, at times, they cause problems due to leakage. Mechanical seal has short life 13. 0000001684 00000 n
Experts say that several types of damages can occur. Therefore, the test machine mechanical seal leakage, in the exclusion of the shaft and the end of the seal after the entry into force, are basically due to moving and static ring friction caused by damage. Evaluating centrifugal pump packing that has failed or reached the end of its useful life offers vital clues to help you make improvements in your next round of sealing. In many cases, the centrifugal pumps are perfor-mance tested or hydrostatic tested on water prior to storage. 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… In order to understand centrifugal pump leakage, it’s important to first understand the basic operation of a centrifugal pump. The obvious function is that of a check valve to prevent liquid under pressure from leaking out of the pump, or from drawing air into the pump when under vacuum conditions. A mechanical seal is simply a method of containing fluid within a vessel (typically pumps, mixers, etc.) Remove the pump casing and the impeller from the pump. The mechanical seal is the shaft seal device of the centrifugal pump, which has the advantages of small leakage and long life. Double mechanical seals Back-to-Back are generally selected where pumped liquid is absolutely not allowed to leak from the pump. Have you selected the proper secondary seals, such as gaskets and o-rings, that are prepared for chemical and heat attacks? The pump and seals must be dried before storage. Suitable for many different fluids in a variety of in-dustries and processes, it is capable of handling low, medium and high flow volumes. centrifugal pump mechanical seal animation – Seals and . 0000001761 00000 n
Here are a few tips for How to install the mechanical seal in a centrifugal pump. So we have a centrifugal pump mechanical seal failure the other day. A mechanical seal is a device that uses the centrifugal force to push water through the hoses and plumbing system. Double mechanical seals in Series are chosen where the pumped liquid may escape the pump toward the pump exterior but it is controlled and contained in the closed seal loop but never to escape to the atmosphere. Replace the mechanical seal in your centrifugal pump to protect the pump from leaks. 0000007815 00000 n
Our Scot Pump product specialists will help you get the right seal at the right price. (2) When the sealing end face is installed, not clean it up and contain granular impurities. The mechanical seal leaked when the pump was stopped (Not immediately after stopping but after 1/2 an hours time. There are more complex designs with double, tandem or other arrangements which place a … You need a proper seal flush arrangement, along with sufficient cooling. 0000000656 00000 n
Are your materials appropriate for your specific application? Which is the best and most effective sealing technology for your pump or agitator application? WHY DO PUMPS NEED TO BE SEALED? This video will show you how to safely and properly replace a pump seal. Expellers can also be more cost-effective than mechanical seals and, since repairing mechanical seals can cost up to 60% of the installation, price is a factor for many. It is widely accepted based on extensive operating experience that mechanical seals are the most vulnerable 0000004738 00000 n
Mechanical seals are a major factor in rotating equipment reliability. CENTRIFUGAL PUMP AND SEAL (API Std. The pump has a pump casing, a rotatable drive shaft extending into the casing from the rear side, and an open impeller mounted on the drive shaft, this impeller having radially extending vanes with leading and trailing edges. 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. Pump overheats, seizes, or both 18. direct the flush water away from the process to avoid contamination. The mechanical seal will soon fail if the pump continues to run in this condition. A mechanical shaft seal is made up of a stationary face and a rotating face. The reliability of any centrifugal pump in a critical application is strongly influenced by the performance of the mechanical seals. A centrifugal pump with a mechanical seal cartridge is disclosed. Causes and solutions for leakage of mechanical seals: 1. Leaking Pump? For example, auxiliary systems are sometimes required to provide an acceptable operating environment for a mechanical seal. This may indicate the following: 1. Shaft or sleeve wear The mechanical seal leaked when the pump was stopped (Not immediately after stopping but after 1/2 an hours time. mechanical seal, this thin liquid film, of necessity, leaks to the low pressure side of the seal, usually outside the pump. Process Pump & Seal, Inc. is your local distributor of Centrifugal Pumps. Mechanical seals play a critical role in the centrifugal pump. ����JgUr�z+�d�ڷ�M7�1�����L��T�é�[`;%�O�Ґ�)Aя}�!�"Qk{�i`�.B����lޚ����K�*6X�P�H�E�)p(aC�����&1u�l�[�('��&,N �. Anyone who works with pump sales and engineering knows that when any kind of anomaly occurs anywhere in the system, it’s got to be the pumps fault. The centrifugal pump spins a shaft at high speed which rotates an impeller, creating a vacuum through centrifugal force that pulls the water. Its main responsibility is to control leakage. 0000001121 00000 n
In a single type mechanical seal pump, this liquid is normally the fluid being handled by the pump. In this case, the mechanical seals should be stored in accordance with Storage of Mechanical Seals in Their Original Packaging. As you remove the rings from the stuffing box, try to keep the rings in removal order to best determine the failure mode. Priming – Casing and suction line not completely filled with liquid. All seals leak—they have to in order to maintain a fluid film over the entire mechanical seal face. Regular maintenance of these seals is needed to ensure there are no leaks. A mechanical seal is a device that uses the centrifugal force to push water through the hoses and plumbing system. Dirt or contamination in between the mechanical seals. Here are a few tips for How to install the mechanical seal in a centrifugal pump. Mechanical seal After a static test, high-speed rotation during operation to produce centrifugal force, will inhibit the fluid leakage. As mentioned the mechanical seals will not block the leakage completely, thus the pump will always have a leakage. 0000000991 00000 n
A mechanical seal pump could potentially save you a lot of annual costs. Impeller or casing, or both, has short life 19. 1.Mechanical seal failure phenomenon and analysis Pump mechanical seals are available in a wide variety of models, there are five main leak points: (1) Seal between bushing and shaft. 0000004412 00000 n
A mechanical seal is a device that is used to control leakage between a rotating shaft and a liquid- or gas-filled vessel. Here are 6 of the most common reasons mechanical seals can fail. The atmospheric side must not enter into the seal chamber. Mechanical seals are used in most oilfield centrifugal pumps. The leak was not severe and only a drop a second was seen leaking. Do you have a soft foot? Call us today ! I was wondering what could be the reason behind the leakage in the seal only when stopped. 0000003871 00000 n
____________________________________________MODERN PUMPING TODAY, July 2016Did you enjoy this article?Subscribe to the FREE Digital Edition of Modern Pumping Today Magazine! A few basic components and principles in mechanical seal design contribute to a working seal at the interface of the rotating shaft and stationary pump/mixer/seal-chamber housing. Mechanical seal systems are used on various seal designs to detect leakage, control the seal environment and lubricate secondary seals. Since our subject is dealing with pumps, let’s first explore a basic understanding of the need to seal a process liquid in a centrifugal pump. A packing pump may be affordable to install and maintain, but if you calculate how many gallons of water it consumes per minute or per year, you may be surprised by the cost. Insufficient Net Positive Suction Head (NPSH): If you don’t have enough suction head to your pump, the rotating assembly can become unstable, cause cavitation, and result in a seal failure. protect the bearing box from flush water, which can contaminate the oil and eventually lead to a bearing failure. Scot Pump Mechanical Seal Replacements Order New End Suction Centrifugal Pump Seal Parts With or Without Retainers. Bearings operate with noise 17. Though it is a rare occurrence, the eventualities are critical if it happens. As the flow enters through the impeller eye of the pump and up the impeller vanes, the fluid is at a lower pressure and low velocity. Basics of fluid pump sealing. The rotating part is axially pressed against the stationary part. Fluid enters a centrifugal pump through the suction nozzle at the center of a rotating impeller. Do you have a good tribological (the study of friction) pair? Basics of fluid pump sealing. Leak during test run. need to be stored separately from the pump. Mechanical seals are used in most oilfield centrifugal pumps. Wherever machinery operates there will be seals of some kind ensuring that the machine remains lubricated, the fluid being pumped does not leak, or the gas does not enter the atmosphere. Though it is a rare occurrence, the eventualities are critical if it happens. trailer
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Seals and Sealing Handbook, Fifth Edition. Know about Mechanical Seal in a Centrifugal Pump. The Centrifugal Pump Mechanical Seal acts as a check valve and a slider bearing. Place a new mechanical seal onto the shaft. I’ve been attending this conference off and on for 25 years and always sit in on the discussion groups for pump users and mechanical seal users. As the fluid film passes across the mechanical seal, it can flash at the atmospheric side and cause a failure. Introduction The mechanical seal acts as a check valve and a slider bearing. Sulzer White Page: Reviving Pump Performance, Getting the Most from Your Bearings: Part 1 of 2, The Royal Discipline of TIG Welding: Part 2 of 2, The Royal Discipline of TIG Welding: Part 1 of 2, By Land and By Sea, Special Offshore Painting Prevents Corrosion. TIPS TO PREVENT MECHANICAL SEAL LEAKAGE IN A CENTRIFUGAL PUMP • Mechanical seals play a critical role in the centrifugal pump. If you have improper venting, air can get trapped around the seal and won’t be able to evacuate the stuffing box. Mechanical seals vs. pump packing? Shaft misalignment, coupling imbalance, and impeller imbalance can all contribute to mechanical seal failures. 0000007625 00000 n
Mechanical Seals and Packed Shaft Seals. The pump was started again to see if the seal leaks during running but it did not. Fluid enters a centrifugal pump through the suction nozzle at the center of a rotating impeller. 1.Mechanical seal failure phenomenon and analysis Pump mechanical seals are available in a wide variety of models, there are five main leak points: (1) Seal between bushing and shaft. It has a shaft that spins at great speed and rotates an impeller. The shaft seal is a sealing element which seals the rotating shaft of a centrifugal pump where it passes through the non-rotating pump casing, reducing fluidleakage to atmosphere or the entry of air from outside to a certain level, and keeps wear of the sealing faces as low as possible.. Bearings overheat 16. Magnatex expeller/repeller design pumps are used in applications where there is a possibility of dry run conditions, liquid slurries up to 40% or crystallizing liquids, all of which are damaging to mechanical seals or packing. 27 0 obj
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The flow that goes into the pump has to go out of the pump. Neglecting the Best Efficiency Point: Are you operating the pump at the Best Efficiency Point (BEP) on a performance curve? They eliminate the need for gland water that stuffing boxes require, minimizing water consumption and offering significant savings as some don’t require flush water. The obvious function of our Centrifugal Pump Mechanical Seals is that of a check valve to prevent liquid under pressure from leaking out of the pump, or from drawing air into the pump when under vacuum conditions. Packing seals are removed and replaced much more often than mechanical seals, which causes considerable wear and tear to the pumps as they are disassembled and reassembled. MECHANICAL SHAFT SEAL A mechanical shaft seal … If a mechanical seal is stored installed in a centrifugal pump, the preparation and storage conditions for both components must be considered together. This article will explain what a mechanical seal is and the key design features that make them work. Dry Running & Improper Venting of Seal: A vertical pump is the most susceptible since the mechanical seal is positioned on top. When choosing the sealing option that’s right for your applications, mechanical seal and gland packing seal offer both pros and cons. 610 and 682) Presented By Prakash Kumar ME(NSPL) CONTENTS OF PRESENTATION BRIEF ABOUT CENTRIFUGAL PUMPS AS PER Std .API 610 . This pump minimizes leakage with a Mechanical Seal. The elbow causes a turbulent flow that creates instabilities in the rotating assembly. Usually a “lantern ring” allows flush water to be applied to the packing. All Single Mechanical Seals leak—they have to in order to maintain a fluid film over the entire mechanical seal face. 1. If the tolerance of the bearings wears thin, the shafts will move and cause vibrations in the pump. While many centrifugal slurry pump owners choose expellers or stuffing boxes over mechanical seals, mechanical seals can offer significant savings if maintained correctly. This failure often happens with boiler feed systems—hot water at 250-280ºF flash with the pressure drop across the seal faces. MECHANICAL SEAL DESIGN AS PER Std .API 682 . It could take several rounds of investigation to identify the true root cause of a packing issue. The suction nozzle at the best Efficiency Point ( BEP ) on a performance curve drop. This condition at great centrifugal pump mechanical seal leaking and rotates an impeller 6 of the mechanical seal pump which! Period of use is normally the fluid being handled by the pump, the mechanical seal face in! From making contact with the shaft seal … the centrifugal pump in a pump! Or casing, or centrifugal pump mechanical seal leaking dynamic o-ring ( or gasket ) as the mechanical seal application how... 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