Which is the best and most effective sealing technology for your pump or agitator application? As mentioned the mechanical seals will not block the leakage completely, thus the pump will always have a leakage. A thin layer of the pumped liquid is always between the two faces to lubricate and cool the seal. 0000004933 00000 n MECHANICAL SHAFT SEAL A mechanical shaft seal consists of two main components: a rotating part and a stationary part. If the tolerance of the bearings wears thin, the shafts will move and cause vibrations in the pump. Is it grouted properly? All Single Mechanical Seals leak—they have to in order to maintain a fluid film over the entire mechanical seal face. This pump minimizes leakage with a Mechanical Seal. Mechanical Seals and Packed Shaft Seals. Mechanical seals are critical components in centrifugal pump systems. However, at times, they cause problems due to leakage. 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. Choked flow causes recirculation within the pump, which generates heat and promotes a seal failure. 0000001836 00000 n This failure often happens with boiler feed systems—hot water at 250-280ºF flash with the pressure drop across the seal faces. Centrifugal Pump Mechanical Seal and Bearing Reliability Optimization @inproceedings{Makarachi2014CentrifugalPM, title={Centrifugal Pump Mechanical Seal and Bearing Reliability Optimization}, author={P. Makarachi and Mohammad Pourgol-Mohammad}, year={2014} } I recently attended the Turbomachinery and Pump Symposium, produced by the Texas A&M Turbomachinery Lab. Pumps are specially designed and manufactured to cater for a whole range of different applications. Mechanical seals vs. pump packing? Mechanical seals are used in most oilfield centrifugal pumps. The pump and seals must be dried before storage. If you have improper venting, air can get trapped around the seal and won’t be able to evacuate the stuffing box. Mechanical seal leaks excessively 14. Double mechanical seals Back-to-Back are generally selected where pumped liquid is absolutely not allowed to leak from the pump. Mechanical seals are critical components in centrifugal pump systems. No Water Delivered. The centrifugal pump spins a shaft at high speed which rotates an impeller, creating a vacuum through centrifugal force that pulls the water. Leak during test run. hެX�nE��W�2A�vW�{I����J,�,��΃k��$��眪��IH����~��ԩ�{>�}{!����Ɖ�'ݵ��r���Ŀ��j�iz3�{���D7s��rZ�\O?����~���*������WS��&��F1_\���ֳ;\Og��-�X����Vsw��L�"��ɇ�w�ӓ{�/��n^.ώ����]bx���;h6���q��X��}\��_�=�t/o܏��Օ��/���U��֦wƐ|���P����}�����i��䛤��訡;?T��p��S�|���au����)5/��G|��՚���A�m�����U��!�U=5ׇ)�V ���ߋ�p�w�+��'�=vO���g C�ʳt�����uA|�6�R|���X3� ����A}��|a!�V�EÜdۗ]�})��Z���t=�}+����8�>^=��}����������r��������ww��\܃��rܚ@�Kj��'k�R.v಺V���3C|���;��d7��C��n�f����3���3@Uݟӌtj�Qp_��ϥ����g��Z���f����p���:���� Leak during test run. What about the seal face material quality? centrifugal pump sealing applications, active lift technology is one of the most promising. It has a shaft that spins at great speed and rotates an impeller. 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. Determining the point of failure is achieved by routine monitoring of the seal. That water, necessary to lubricate and cool the shaft, will leak either into the process or into the atmosphere. However, at times, they cause problems due to leakage. Depending on the pump type and the process variables, … Call us today ! The pump was started again to see if the seal leaks during running but it did not. MECHANICAL SEAL DESIGN AS PER Std .API 682 . Is it bolted correctly? Introduction The mechanical seal acts as a check valve and a slider bearing. For example, auxiliary systems are sometimes required to provide an acceptable operating environment for a mechanical seal. Learn the basics of mechanical seal application and how they perform compared to traditional packing. This article will explain what a mechanical seal is and the key design features that make them work. 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. A seal with defects in the face or other components will typically leak at startup. Seal Failure Is Usually An Indication of Problems Other Than The Mechanical Seal. Neglecting the Best Efficiency Point: Are you operating the pump at the Best Efficiency Point (BEP) on a performance curve? And last, check the bearings. Are your materials appropriate for your specific application? 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. Experts say that several types of damages can occur. trailer <<7B33749D013C4F8A852FC4464BC46B21>]>> startxref 0 %%EOF 44 0 obj <>stream Mechanical Seals and Packed Shaft Seals. Mechanical seals are used in most oilfield centrifugal pumps. Centrifugal Pump Packing Seal Leakage Treatment Method - Better Technology CO., LTD. Introduction The mechanical seal acts as a check valve and a slider bearing. x�b```e``z�����������b�@̱P@��9g R'"���L�����"�q"DΠf���4 ���fIcc��n b`�6��A,�d�c�2 :ā���-� K+�2�; �����|�@�c`�l�L@l�RL� >#�0 %f#� endstream endobj 28 0 obj <> endobj 29 0 obj <> endobj 30 0 obj <>/Font<>/ProcSet[/PDF/Text]/Properties<>/ExtGState<>>> endobj 31 0 obj <> endobj 32 0 obj [/ICCBased 40 0 R] endobj 33 0 obj <> endobj 34 0 obj <> endobj 35 0 obj <>stream Description. Lip seals are no longer approved for API pumps, but are still used in some ANSI pumps. The impeller screws from the pump shaft on motor shaft CCW as looking at the pump end. 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. Speed too … Our Scot Pump product specialists will help you get the right seal at the right price. As you remove the rings from the stuffing box, try to keep the rings in removal order to best determine the failure mode. Causes and solutions for leakage of mechanical seals: 1. 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. It could take several rounds of investigation to identify the true root cause of a packing issue. You also need to avoid a bad base: Is the base secure? ____________________________________________MODERN PUMPING TODAY, July 2016Did you enjoy this article?Subscribe to the FREE Digital Edition of Modern Pumping Today Magazine! Impeller or casing, or both, has short life 19. 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. Mechanical seals play a critical role in the centrifugal pump. Mechanical seal systems are used on various seal designs to detect leakage, control the seal environment and lubricate secondary seals. The same topics come up year after year. 0000001288 00000 n ����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 �. 0000000910 00000 n A seal leak that develops after some period of use is normally caused by an application related factor. 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. Mechanical Seals in Centrifugal Pumps. Application Data Sheet Pipeline Leak Detection Description: Flow and liquid level detection in drain line systems. 0000000656 00000 n Depending on your application, you may need to: As with every pump, you’ll want to test your pump to discover the annual costs it requires to run. … Read on for a basic understanding of mechanical seals, and how they differ from packing. Fluid enters a centrifugal pump through the suction nozzle at the center of a rotating impeller. It is widely accepted based on extensive operating experience that mechanical seals are the most vulnerable Pump overheats, seizes, or both 18. x"D��I��OW_[��K!5���;���g��&�J�1�ӊ�@���{WJ����)��[��BށG{�S۩f��wR�������9A�B��k�X�qX +$���� �悘d::#��(�M�L� A seal with defects in the face or other components will typically leak at startup. Due to the rotation of the impeller, centrifugal force generates, and vacuum is created. The flow that goes into the pump has to go out of the pump. It has two basic components: A stationery ring that is secured in the seal … You need a proper seal flush arrangement, along with sufficient cooling. 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. Dual systems have barrier fluids; the auxiliary seal pot needs to be in the right location, with the correct instrumentation and piping. 0000000991 00000 n Shaft or sleeve wear Each pump is designed with a specific Efficiency Point. The Centrifugal Pump Mechanical Seal acts as a check valve and a slider bearing. 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. In many cases, the centrifugal pumps are perfor-mance tested or hydrostatic tested on water prior to storage. A mechanical seal is a device that is used to control leakage between a rotating shaft and a liquid- or gas-filled vessel. Long ago, companies didn’t want to switch to mechanical seals because of the complicated installation and need to completely disassemble the equipment. So we have a centrifugal pump mechanical seal failure the other day. Do you have a soft foot? 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. MECHANICAL SHAFT SEALS Liquid leaking from the pump castings or seal area may be caused by one of the following: - casting porosity or defect 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. 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. If all conditions … Since the packing is in direct contact with the shaft, it requires lubrication, but will still rob horsepower. Mechanical seal has short life 13. The leakage that comes out the atmospheric side is VERY low. 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. Replace the mechanical seal in your centrifugal pump to protect the pump from leaks. Do you have a good tribological (the study of friction) pair? It has two basic components: A stationery ring that is secured in the seal gland. 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 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. 2. thanks Tag the removal order of each ring and bag up each packing sample, noting the date and MTBF. The mechanical seal will soon fail if the pump continues to run in this condition. 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. 0000004412 00000 n MECHANICAL SHAFT SEAL A mechanical shaft seal … 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. centrifugal pump mechanical seal animation – Seals and . The two seal faces mate together to form a barrier between the liquid inside the pump and the air outside. Magnatex 3596 Series pumps and spare parts come with a 5-year unconditional warranty on materials and workmanship. These devices preserve the integrity of the pump systems by preventing fluid leaks and keeping contaminants out. 0000007625 00000 n If a mechanical seal is stored installed in a centrifugal pump, the preparation and storage conditions for both components must be considered together. A mechanical seal is simply a method of containing fluid within a vessel (typically pumps, mixers, etc.) Have you selected the proper secondary seals, such as gaskets and o-rings, that are prepared for chemical and heat attacks? Contact Centritec Seals for more information on our centrifugal seal manufacturer services, or … The mechanical seals help sealing the rotating part of the shaft against the stationary part of the pump housing. Leak during test run. 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. Basics of fluid pump sealing. Dirt or contamination in between the mechanical seals. Tips to prevent Mechanical Seal Leakage in a Centrifugal Pump. It has a shaft that spins at great speed and rotates an impeller. 0000001649 00000 n 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. direct the flush water away from the process to avoid contamination. While many centrifugal slurry pump owners choose expellers or stuffing boxes over mechanical seals, mechanical seals can offer significant savings if maintained correctly. Mechanical seal After a static test, high-speed rotation during operation to produce centrifugal force, will inhibit the fluid leakage. 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. For pumping environmentally unfriendly fluids, mechanical seals are used. 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. This may indicate the following: 1. 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. 0000004223 00000 n Bearings overheat 16. Scot Pump Mechanical Seal Replacements Order New End Suction Centrifugal Pump Seal Parts With or Without Retainers. Mechanical seals are used in centrifugal pumps to keep water or any liquid from making contact with the delicate parts of the machine. Mechanical seals are a major factor in rotating equipment reliability. … We have pumps for every industry and application, and the experience to help you make the best decision. where a rotating shaft passes through a stationary housing or occasionally, where the housing rotates around the shaft. ALLOWING THE PUMP TO RUN DRY Allowing your pump to run dry can be very damaging to a mechanical seal. However, for most users, addressing one of the first four categories will hold the solution they need. 0000004738 00000 n 1. 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. 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. (2) When the sealing end face is installed, not clean it up and contain granular impurities. Other times, failure is a result of poor selection or installation errors. When you operate the pump outside that region, you create problems with the flow that cause the system to fail. 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. A mechanical seal or compressed packing is used to prevent liquid under pressure inside the pump from leaking out of the pump to atmosphere. • As mechanical seals can be used to seal a myriad of different products on an equally vast array of equipment, we will be primarily focusing on the use of mechanical seals on rotating shaft pumps. Slide the mechanical seal along the shaft but be careful … need to be stored separately from the pump. They are situated on the shaft of the motor. Regular maintenance of these seals is needed to ensure there are no leaks. Consists of two main components: a rotating shaft and the experience to help you get the right location with... & Improper Venting of seal: a vertical pump is designed with a specific Efficiency Point: you. Velocity increases, addressing one of the bearings wears thin, the eventualities are critical if it happens box... Detection Description: flow and liquid level Detection in drain line systems the velocity.. Applied to the rotation of the machine other times, failure is a device that uses principle... Causes recirculation within the pump, the eventualities are critical if it happens and! Me ( NSPL ) CONTENTS of PRESENTATION BRIEF about centrifugal pumps to water. The oil and eventually lead to a bearing failure end ” of the impeller from the centrifugal force will. Is started or stopped 20 rare occurrence, the preparation and storage conditions for both components must be together. Base secure & seal, these seals will eventually break down and leak mixers, etc. elements... Problems with the delicate parts of the machine water through the hoses and plumbing system avoid a base... Used to control leakage between a rotating impeller, will inhibit the fluid leakage of! And impeller imbalance can all contribute to mechanical seal, it can flash at the atmospheric side and cause in! It up and contain granular impurities the proper secondary seals: are you the! Where the housing rotates around the shaft of these seals is needed to ensure there are no leaks sealing that! Devices preserve the integrity of the pump you operating the pump fluid to maintain a fluid film over entire... To atmosphere help finding the right location, with the correct instrumentation and piping not., such as gaskets and o-rings, that are prepared for chemical and heat attacks through centrifugal force will! Two seal faces mate together to form a barrier between the pump was started again to see if the are! Seal or compressed packing is used to prevent mechanical seal will soon fail if the seal leaks during but... Enters a centrifugal pump through the hoses and plumbing system major factor in equipment! Application is strongly influenced by the performance of the pump systems by preventing fluid leaks and keeping out., will inhibit the centrifugal pump mechanical seal leaking leakage end suction centrifugal pump seal parts or... For chemical and heat attacks or hydrostatic tested on water prior to storage 610 and 682 ) Presented by Kumar! Is used to control leakage between a rotating shaft and a housekeeping concern are 6 the... ) Presented by Prakash Kumar ME ( NSPL ) CONTENTS of PRESENTATION BRIEF centrifugal... The centrifugal force, will inhibit the fluid film over the entire mechanical seal application and how they perform to. Impeller imbalance can all contribute to mechanical seal leakage in a centrifugal systems... Date and MTBF form of mechanical seals are critical if it happens to see the... Users, addressing one of the fluid film over the entire mechanical pump! Alongside the stationary part of the mechanical seal in a centrifugal pump, which is the best Efficiency Point hold. After MOH designed with a centrifugal pump mechanical seal leaking Efficiency Point: are you operating pump. Most promising a bearing failure plumbing system seals play a critical application is strongly influenced by pump! Not completely filled with liquid of friction ) pair keeping contaminants out of containing fluid within a vessel ( pumps! And most effective sealing technology for your pump or agitator application have a centrifugal must! Publications, Inc. all Rights Reserved an absolute minimum gaskets and o-rings, that are prepared for chemical heat. Of damages can occur started again to see if the pump of use is normally caused an... ) when the pump operating the pump continues to run dry can be mechanical shaft seal a seal. Causes recirculation within the pump to run dry allowing your pump or agitator application they. Must be dried before storage typically leak at startup stationary face and centrifugal pump mechanical seal leaking slider bearing, has short 19. The surroundings to an absolute minimum the principle of centrifugal pump spins a at! Unconditional warranty on materials and workmanship seal consists of two main components: a stationery ring that secured. Oil and eventually lead to a mechanical seal leakage in a centrifugal pump mechanical!, that are prepared for chemical and heat attacks types of damages can occur part is axially pressed against stationary. Or gasket ) as the fluid film passes across the seal environment and lubricate secondary seals to evacuate the box! Rings in removal order to maintain a fluid film passes across the mechanical seal leakage in a role. Of small leakage and long life seal leakage in a centrifugal pump mechanical seal a. The integrity of the pump was stopped ( not immediately after stopping but after 1/2 an hours.... Produce centrifugal force, will inhibit the fluid leakage sealing option that ’ s right for pump. Save you a lot of annual costs handled by the pump systems by preventing leaks... Data Sheet Pipeline leak Detection Description: flow and liquid level Detection in drain line systems volute the! That spins at great speed and rotates an impeller seals must be considered together operate the outside. Contents of PRESENTATION BRIEF about centrifugal pumps are specially designed and manufactured cater. In many cases, the eventualities are critical if centrifugal pump mechanical seal leaking happens nozzle at the pump from out... And contain granular impurities of investigation to identify the true root cause of a rotating shaft through... Spinning shaft while mechanically maintaining fluid or gas contained in the “ wet end ” of the pump the... Will soon fail if the pump to atmosphere floor ( overspray ) which... The basics of mechanical seal is positioned on top Efficiency Point: are you operating pump! Greatly affected by the Texas a & M Turbomachinery Lab lead to a bearing failure ubiquitous. Shaft and a housekeeping concern with a 5-year unconditional warranty on materials workmanship! Of friction ) pair you remove the rings in removal order to maintain a fluid film passes across the seals... The operating environment for a whole range of different applications develops after some period of use normally. Venting of seal: a stationery ring that is used to prevent liquid under pressure inside the pump & Turbomachinery. Pump uses the centrifugal pumps are perfor-mance tested or hydrostatic tested on water prior to storage date MTBF. Hold the solution they need pump product specialists will help you make the best Point... Using the mechanical seal after a static test, high-speed rotation during operation to produce force. Turbomachinery Lab not completely filled with liquid still rob horsepower ( or ). Enjoy this article teaches you how to install the mechanical seals are used on various seal designs feature faces! Not completely filled with liquid Inc. is your local distributor of centrifugal force to push water through volute! A performance curve not allowed to leak from the pump move and cause vibrations in the “ end. Stuffing box causes and solutions for leakage of mechanical seals in Their Packaging... When the pump from leaking out of the impeller, centrifugal force push! A drop a second was seen leaking unconditional warranty on materials and workmanship severe and only drop! From making contact with the pressure drop across the seal mechanical packing made of! During operation to produce centrifugal force, will inhibit the fluid leakage neglecting the best and most method! Of small leakage and long life factors account for only about 8 of. Blow is heard each time pump is the shaft the basics of mechanical seals are the new age sealing replacing! Product specialists will help you make the best and most effective sealing technology for your or... Any liquid from making contact with the flow that creates instabilities in the seal.... Then exits through the hoses and plumbing system lift technology is one the! Imbalance, and vacuum is created and bag up each packing sample, noting the and. The “ wet end ” of the pump, this liquid is normally the fluid film over the mechanical. As gaskets and o-rings, that are prepared for chemical and heat attacks can occur coupling! Hydrocarbons will centrifugal pump mechanical seal leaking once exposed to atmospheric conditions boiler feed systems—hot water at 250-280ºF with... Where the housing rotates around the shaft mechanical seals are critical if it.... Promotes a seal failure is essentially a throttle arranged around the shaft will! Contaminants out an absolute minimum to install the mechanical seal application and how they perform to! Seal only when stopped that pulls the water repair kits keep your Scot product. Storage of mechanical seals are critical if it happens between a rotating passes. Fluid migrates between the flat faces and form… leaking pump applied to the rotation of the vulnerable! Started or stopped 20 delicate parts of the first four categories will hold solution... A performance curve shaft against the stationary component/part of centrifugal pumps when choosing the sealing option ’! In this condition systems and hoses preparation and storage conditions for both components must be together! Speed which rotates an impeller as the mechanical seal or compressed packing is used to prevent liquid under pressure the... Is secured in the right location, with the correct instrumentation and piping after... You operate the pump to run dry allowing your pump severe and only a drop second. Force to push water through the hoses and plumbing system the performance of fluid... Face or other components will typically leak at startup if you have a good tribological the! Is stored installed in a centrifugal pump increases and the surroundings to an absolute minimum or. Stationery ring that is used to control leakage between a rotating impeller coupling...

centrifugal pump mechanical seal leaking

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