Dry gas seals are in used in compressor stations, processing plants, refineries, chemical plants, and more. Dry gas seal testing and repair now available locally dec 02, 2004 although john crane has always provided customer support and service on a genuinely global scale, an expanded network of service facilities offering rapid and easy access to stateoftheart gas seal testing and refurbishment also ensures 247 service on a local level. Dry gas seals dgs used in ultrahigh pressure gas reinjection systems are setting a new standard in offshore, deepwater applications. Dry gas seal improves reliability and leads to a major. These tools include predictive software code developed inhouse, finite element analysis fea. It is usually either a labyrinth or carbon ring and its purpose is to protect the dry gas seal by preventing lube oil from reaching the secondary or outboard seal. Centrifugal compressor wet seals seal oil degassing and. Dry gas seal testing and repair now available locally.
The seal manufacturer recommended removal for maintenance after. Inadequate fuel gas pressure during start up typical conditions on inboardoutboard seal will include. Specifying engineers sometimes do not give enough attention to the scope, definition and selection of the most appropriate gas seal type, its control system and auxiliaries for a given service application. Cost and maintenance of seal oil systems with their pumps, filters, seal traps, piping, etc. The following maintenance routine is recommended after 60 months of operation. The information found in this handbook will help to make informed decisions regarding the application, operation, and maintenance of dry gas seals. Dry gas seal workshop 4day this instructorled 4day course introduces the principles of dry gas seals and seal support systems for centrifugal compressors, including dry gas seal installation, operation and maintenance.
Mechanical seals a mechanical seal is a device which helps join systems or mechanisms together by preventing leakage e. Api plan 72 externally supplied buffer gas for arrangement 2 unpressurized seals with a dry running containment seal. Pdf dynamic processes of dry gas seal operation are investigated in this paper. Aug 02, 2017 dry gas seals are an integral part of modern centrifugal compressors. Wet seal degassing recovery system for centrifugal. Drygas mechanical seals set a new standard in deepwater. As part of the german freudenberg and japanese ekk group, eagleburgmann is one of the worlds leading. They have application in the oil and gas, pharmaceutical, chemical processing, mineral and ore processing, and general industries. Aura is the next generation of john crane gas seals that ensure reliability and uptime in missioncritical applications.
Dry gas seals are an integral part of modern centrifugal compressors. The popularity of dry gas seals has increased the need for gas seal panels over the years. This stateoftheart solution will help by eliminating the ongoing maintenance costs associated with wet oil seals and thereby greatly increases equipment. Dgs operating characteristics unidirectional versus bidirectional seals faces and seats, o rings materials explosive decompression primary seal gas supply control system primary seal failure detection primary seal gas vent to flare control system secondary seal failure detection tertiary seal types, carbon. Dry gas seal systems have low time spending on maintenance, because they do not have assemblies, which are necessary at the oil circulation pumps, control valves, relief. Centrifugal compressor wet seals high pressure seal oil circulates between rings around the compressor shaft oil absorbs the gas on the inboard side little gas leaks through the oil seal seal oil degassing typically vents methane to the atmosphere seal oil degassing may vent 40 to 200 scfminute. Wet seal degassing recovery system for centrifugal compressors 2014 2 one partner has reduced methane emissions from centrifugal compressor seal oil degassing by separating gas from seal oil in a small separatordisengagement vessel and routing it back into the compressor suction, to high pressure turbine fuel gas, or to low pressure fuel. Figure 4 grooves in seal mating ring dry gas seal systems the use of dry gas seals requires a system designed to supply sealing gas to the seal as a sealing and working fluid for the running gap. The mechanical oil and gas seal dry gas seal and wet gas seal also has become one of the most important research topics. Buffer gas is maintained at a pressure less than seal chamber pressure. Wet seal degassing recovery system for centrifugal compressors. Overview dry gas seals are gaslubricated, mechanical, noncontacting, endface seals, consisting of a mating rotating ring and a primary stationary ring. Dry gas seal systems the use of dry gas seals requires a system designed to supply sealing gas to the seal as a sealing and working fluid for the running gap. As part of the german freudenberg and japanese ekk group, eagleburgmann is one of the worlds leading providers of industrial sealing technology.
Such seals are available for use with a variety of compressed systems, including in harsh environments where other seals might be prone to fai. Common dry gas seal failures are discussed below along with their causes and remedies. Buffer gas is injected into the seal to enhance its sealing capability. A dry gas seal control system must have an adequate range and controllability to maintain a minimum 16 fps 4. Since then the compressor had been in service no anomaly had been observed in any of the dry gas seals, i. These gas seal systems are normally supplied by the compressor oem mounted adjacent to the compressor. Both proven liftoff patterns have high film stiffness and damping capabilities that maintain the gas film under slow roll conditions as well as high speeds up to 250 ms 49,212 fpm. Suggested topics for dry gas seals discussion group. Our systems are simple, robust, flexible and reliable. Electrical testers, process testers, custom machines. These gas seal systems are normally supplied by the compressor oem mounted. While proper design and maintenance of dry gas seals is a wellunderstood topic, dry gas seal failures are still relatively common.
Design, operation, and maintenance considerations for improved. The power consumption of the oil seals is from 50 to 100 kw, while the losses do not exceed 5 kw in dgs. Gas seals eliminate the need for complex and costly seal oil systems, and the ongoing maintenance associated with them. We place great emphasis on manufacturing equipment to operate 247. The dry gas seals employed in siemens centrifugal compressors represent a significant advance in shaft sealing. Technical training for mechanical seals, dry gas seals, and. Both proven liftoff patterns have high film stiffness and damping capabilities that maintain the gas film under slow roll conditions as well as high speeds up to. A chemical plant in the uk was sealing an aceto digester feed pump with a dry running gas seal supplied by an aesseal competitor. The switch of oil wet seals to dry gas seals in centrifugal compressors is a good. Replace all elastomers, replace the springs, replace all seal faces and seats, and carry out static and dynamic testing on a test rig. Dry gas seal contamination prevention system flowserve.
Learning is through an effective blend of classroom theory sessions and practical, handson activities. The leading manufacturer of dry gas seal boosters gas compression systems, inc. At dry gas seals installation the pumping systems for oil circulating are excluded, consuming the electricity, and hence the energy is saved. A dry gas seal is a type of mechanical seal used to contain gases without incursion from contaminants or inadvertent release of the gas into the surrounding environment. Aesseal produces a full range of compressor dry gas seals, pump dry gas seals. Drygas seals dgs used in ultrahigh pressure gasreinjection systems are setting a new standard in offshore, deepwater applications. This course is designed to challenge and extend participants knowledge best practices in international engineeringdesign, manufacturing, tests, inspection, precommissioning, commissioning, startup, operation, maintenance, and troubleshooting features of dry gas seal installed in. The mechanical oil and gas sealdry gas seal and wet gas seal also has become one of the most important research topics. John cranes comprehensive range of dry gas mechanical seals are designed to provide you with the correct seal solution suited for your specific application, to ensure optimal reliability, safety and performance. A seal gas pressure booster system for use with a gas compressor. Dry gas seals services siemens siemens global website.
Apr 02, 2020 a dry gas seal is a type of mechanical seal used to contain gases without incursion from contaminants or inadvertent release of the gas into the surrounding environment. Maintenance personnel purchasing personnel technical management the information found in dry gas seals handbook will help you make informed decisions regarding the application, operation, and maintenance of dry gas seals. Dry gas seals 101 presentation free download as powerpoint presentation. Aug 02, 2017 a dry gas seal control system must have an adequate range and controllability to maintain a minimum 16 fps 4. Engineers operators maintenance personnel purchasing personnel technical management the information found in dry gas seals handbook will help you make informed decisions regarding the. Effective maintenance programs, reliable monitoring system and skilled personnel capable of doing the right installation is essential requirements for prolong seals and compressors life. May 28, 2012 mechanical seals a mechanical seal is a device which helps join systems or mechanisms together by preventing leakage e. The dry gas seal and compressor manufacturers instructions should be strictly followed when installing, commissioning, operating, and maintaining dry gas seals and their support systems. This book presents a complete guide to the technology, from the principle of gas seal operation to lessons. Dry gas sealing systems dry gas seals are being applied to a growing number of new centrifugal compressors and. These failures can result in frequent repairs and costly downtime. Our designs allow for the needs of the process and the maintenance staff and are drawn to scale with 3d software.
The dry lubricated system cuts maintenance and removes the need for lubricating oil. Dry gas seal systems have low time spending on maintenance, because they do not have assemblies, which are necessary at the oil circulation pumps, control valves, relief valves in comparison to oil seal systems. At least one dry gas seal manufacturer recommends maintenance intervals around gas seals on limits set by the elastomer aging process. The compressor was overhauled in september 2016 and both drive end and nondrive end seal cartridges were replaced. Although several case studies of individual failures are available, relatively few.
In the late 1980s, dry gas seals were introduced to the market, which revolutionized. What a dry gas seal application in 1986 showed turbomachinery. The application of dry gas seal system is recommended. Pdf advanced dynamic model development of dry gas seal. A dry gas seal is a mechanical seal that uses a sealing gas to create a barrier between the process gas and the. The need to reduce cost while maintaining safety and accessibility has lead to many innovations in panel design and construction. Dry gas seal operation and maintenance on globalspec. Although several case studies of individual failures are available, relatively few largescale dry gas seal failure studies exist. The dry gas seal and compressor manufacturers instructions should be strictly followed when installing, commissioning, operating, and maintaining dry gas. Compressor is equipped with john crane make dry gas seals of type 28at at its drive and nondrive ends. By finding the cause of the dry gas seal failure, the maintenance manger was able to improve such repeated seal replacement. As dry gas seals have gained acceptance with users and centrifugal compressor original equipment manufacturers oems, the operating envelope is continually. About us at the leading edge of industrial sealing technology.
Gcs founded on january 1st, 2017, was previously a business unit within midwest pressure systems, inc. We are committed to providing the latest technologies and designs in order to provide our turbo machinery customers within global energy industries with the solution. The buffer gas seal complements the dry gas seal but has a completely separate function. Dry gas seals handbook presenting a complete guide to the technology, from gas seal operation to lessons learned from actual field experience, this practical text will help you make informed decisions regarding application, operation, and maintenance of dry gas seals. Dry gas seal operation, maintenance, installation and. Scribd is the worlds largest social reading and publishing site. Gcs products are used in global markets and meet many international codes and standards. Key considerations for dry gas seal performance flow. Inadequate fuel gas pressure during start up typical conditions on inboardoutboard seal will include running. In addition aesseal can provide complete repair and. The seal was unreliable and was failing on average every 3 months at a typical cost of over.
Components dry gas seals dry gas seals, an alternative to isosleeve and isocarbon seals, eliminate the need for oil supply systems. At the same time, the oil and gas enterprises have made certain progress in the scale and technical level of their equipment. Aura reduces operational and transactional costs using a patented polymeric sealing device and can reduce leakage rates by up to 15 percent. Apr 27, 2011 common dry gas seal failures are discussed below along with their causes and remedies. Analysis of historical dry gas seal failure data turbo expo. For turbocompressor applications, the seal panel, the seal piping arrangements, and the seal vent system details are critical for reliability, performance, safety and operation of dry gas seals. Industrial mechanical seal basics seal selection process. Cobeys openframe concept allows for easy process monitoring and maintenance. Vidac solutions is a test systems integration company that provides costeffective turn key solutions for your functional test, product certification, data acquisition and difficult to control process needs. The karsto klab dry gas seal in norway was among the first dry gas seal. Key technical reference documents to include in maintenance planning gas turbine design maintenance features the ge heavyduty gas turbine is designed to withstand severe duty and to be maintained onsite, with offsite repair required only on certain combustion components, hot gas path parts, and rotor assemblies needing specialized shop service. Design, operation, and maintenance considerations for. This stateoftheart solution will help by eliminating the ongoing maintenance costs associated with wet oil seals and thereby greatly increases equipment reliability and efficiency. The mechanical seal basics training software covers a large range of seal types like pusher seals, nonpusher seals, cartridge seals, split seals, double seals, tandem seals, dry gas seals, spring seals, bellow seals, etc.
The gaspac seal is a proven design using either the bidirectional tgroove technology or the advanced pattern groove apg technology. Dry gas seals are widely used now in different compressor applications. Centrifugal compressor wet seals seal oil degassing and control. Aesseal provides a comprehensive dry gas seal refurbishment program. Typical seal oil challengeswet systems have a substantial maintenance and. Flowserve seals are used on a variety of rotating equipment, including pumps, compressors, mixers, steam turbines and other specialty equipment. Dry gas seal systems for centrifugal compressors page 4 of. The parasitic power losses caused by oil shear and drag are also absent with gas seals. Dry gas seals 101 presentation gas compressor bearing. Consider seal pots for your next special fluid system application. The dry gas seal rulepak receives the online data and converts it to actionable information with automatic early warning advisories to operators and maintenance planners.