Combining low capital cost, simple operation, high reliability and the ability to handle large volumes at very high vacuum levels, they can be optimized to. Heat exchange institute hei ihs markit standards store. Performance standards for liquid ring vacuum pumps standards for steam jet vacuum systems standards and typical specifications for tray type. The heat exchange institutes hei s standards for steam surface condensers provides clear directions on capacity requirements for venting equipment when operating in. This edition includes corrections to the previous standard, along with. Hei 28662012 english standards for steam jet vacuum systems7th, boxue58. The heat exchange institute hei is a nonprofit trade association committed to the technical advancement, promotion, and understanding of a broad range of utility and industrialscale heat exchange and vacuum apparatus. Nash designs, builds and tests ejectors at its headquarters in charleroi, pa, in compliance with hei standards for steam jet vacuum systems, the global standard for steam ejectors. Barometric type condenser vacuum system shell and tube type vacuum system plus steam ejector air pumps these processes are described in the following sections but as there are some features in common between the choices another section considers the methods used to design and specify the vacuum systems. Steam ejectors provide vacuum in many process industries and utility companies. Check stamped pressure on nameplate or on nozzle with an accurate steam gauge installed in steam chest with gauge syphon. Unique systems designs and manufactures process vacuum systems including condensers, steam jet ejectors, liquid ring vacuum pumps and hybrids along with instrumentation, complete automation and auxiliary equipment. Hei standards discount bundle 1 amendments, rulings, supplements, and errata.
Backpressure on the system should be as per design conditions. Hei standards for steam jet vacuum systems 5th october 2019 178. Performance standards for liquid ring vacuum pumps, 4th edition hei 119 standard by heat exchange institute, 2011 edition. The new standard now integrates the previous three separate standards on steam jet ejectors. Water box and circulated water pump priming equipment. The heat exchange institutes heis standards for steam surface condensers provides clear directions on capacity requirements for venting equipment when operating in. To maintain the optimum velocity, and avoid excessive heat loss and pressure drop, all insu. Hei standards for steam jet vacuum systems 5th pdf document. Study the appropriate parts of the hei standard for steam jet vacuum systems and any available manufacturers literature on how systems work and how ejectors behave. Hei 3087 standards for air cooled condensers 2nd ed 2016. Includes all amendments and changes through addendum 1. Hei 262304 standards for power plant heat exchangers 4th.
It would be better if you can get hold of the standard. Gas extraction system in kawerau geothermal power plant. Multistage steam jet vacuum pumps in metal construction with liquid ring vacuum pumps hybrid system 121 dwp1 multistage steam jet vacuum pumps in graphite 123 pgv1 arrangements of steam jet vacuum pumps 125 gdp2 laboratory steam jet vacuum pumps 129 ldp1 planning a steam jet vacuum pump 1 gdp3 oquestionnaire for the planning of a steam. This create a vacuum in a vessels or chamber to which ejector is connected. If the steam supply is dry, the cooling water clean and the materials of construction matched properly to the corrosive nature of the process fluids, steam jet vacuum systems can and do last. If steam use constraints are not a factor, higher vacuum and capacity can be achieved by adding steam jet ejectors and condensers upstream of the existing system. Hei is a nonprofit trade association concentrating its efforts on the manufacturing and engineering aspects of steam surface condensers, closed feedwater heaters, power plant heat exchangers, liquid ring vacuum pumps, steam jet ejectors, deaerators, and air cooled condensers. Steamjet vacuum systems combine ejectors, condensers and interconnecting piping to provide relatively lowcost and lowmaintenance vacuum pumping. Nash has been designing, manufacturing and troubleshooting steam jet air ejector systems since 1986. Process design of vacuum equipment vacuum pumps and steam jet ejectors project standards and specifications page 6 of 36 rev. Publication list title standards for steam surface condensers, 11th edition, 2012 standards for direct contact barometric and low level condensers, 9th edition, 2014 standards for steam jet vacuum systems, 7th edition, 2012 standards for closed feedwater heaters, 9th edition, 2015 standards and typical.
Steam jet ejectors are used in the chemical, petrochemical, pulp and paper, food, power, steel and allied industries in connection with such operations as filtration, distillation and evaporation, absorption, mixing, vacuum packaging, freeze drying, flash cooling, deaerating, dehydrating and degassing to name. The condenser cleanliness coefficients was one of the parameters to characterize the tube dirt degree, which indicated that the ratio of heat transfer coefficient about the old and the new tubes at the same flow rates and steam. Fellow forum members, i am working on a vacuum system and looked for a resource to estimate the air infiltration into the various vessels that are connected to the vacuum system, and i came across the following resource. Hei standards for steam jet vacuum systems 5th mole unit. Hei standards are recognized worldwide as the leading standards for heat exchange equipment. Multistage steam jet vacuum pumps in metal construction with liquid ring vacuum pumps hybrid system 115 dwp1 multistage steam jet vacuum pumps in porcelaingraphite 117 pgv1 arrangements of steam jet vacuum pumps 119 gdp2 laboratory steam jet vacuum pumps 123 ldp1 planning a steam jet vacuum pump 125 gdp3.
Hei steam jet vacuum systems troubleshooting guide steam jet vacuum systems are fundamentally reliable vacuum producers as they have no moving parts. This edition includes corrections to the previous standard, along with updated information gleaned from upgrades of other reference materials. Steam jet ejector nozzle steam free 30day trial scribd. Multistage steam jet vacuum systems ideal solutions for any application there is virtually no limit to where multistage steam jet vacuum systems in the processing industry can be used. Hei standard for power plant heat exchangers really appreciate anyone sharing this standard. Standards for jet ejectors, standards for field testing, and construction standards for steam jet ejector components. Nevertheless, many of their possible services are overlooked.
Steam jet vacuum systems are fundamentally reliable vacuum producers as they. Equivalent suction flows for steam jet vacuum pumps. They often are used to pump gases and vapors from a system to create a vacuum. Standards for closed feedwater heaters standards for steam surface condensers performance standards for liquid ring vacuum pumps standards for steam jet vacuum systems standards and typical specifications for tray type deaerators standards for power plant heat exchangers. Hei standards for steam jet vacuum systems 5th pdf. The vapor pressure of the sealant fluid is the limiting factor and vacuum is usually limited to about 25 torr. Hei 28662012 english standards for steam jet vacuum systems 7th, boxue58. The steam should be dry and saturated, unless the system specifications call for superheated steam. In general, the diameter of the piping between the process and the ejector system must be at least as large as the suction connection in the firststage ejector.
We also lead the industry in the duplication of parts and assemblies for rotating equipment such as steam turbines, compressors and more. Vacuum pumps and steam jet ejectors project standards and specifications page 2 of 36 rev. August 2018 addendum 1 to standards for steam jet vacuum systems, 7th edition. Dec 28, 2019 standards for steam jet vacuum systems, 7th edition hei 125 standards and typical specifications for tray type deaerators, 10th edition hei 120 standards for air cooled condensers, 2nd edition hei 121, hei 30872017. Default name a z name z a price low high price high low show. The evacuation packages perform two distinct services namely hogging and holding. We are also a proud member of the heat exchange institute hei. Standards for steam jet vacuum systems, 7th edition hei 125 standard by heat exchange institute, 2012 edition. Use the appropriate pressure and temperature gauges to determine fluid conditions and flow meters. Air ejectors m3hr liquid ring vacuum pumps are limited in the vacuum they can produce.
Hei standards for steam jet vacuum systems 5th mole. Case studysteam jet ejector free download as powerpoint presentation. Hei standards for steam jet vacuum systems 5th free download as pdf file. Steam jet ejectors are based on the ejectorventuri principle. Product catalog gea engineering for a better world. Condenser performance curves predict condenser vacuum under given steam loads, circulating water temperatures, cleanliness factor etc.
We can compare our vacuum pump curves to your condenser curve for the best possible selection. Hei standards for steam jet vacuum systems 5th q6ngzzpkgjlv. Foreword this addendum to the 7th edition of the heat exchange institute standards for steam jet vacuum systems provides new material for the. Case study steam jet ejector free download as powerpoint presentation.
Inlet the port by which gas to be pumped enters a pump, also. Excessive backpressure increases the brake horsepower, and may have an effect on the capacity of the vacuum pump. The condenser performance test and thermal performance. Please list which standard s are used by you or your company.
If the pressure is low, the steam nozzles can probably be altered to suit the existing conditions. Hei concentrates its efforts on the manufacturing and engineering aspects of air cooled condensers, steam surface condensers. The primary purpose of hei is to develop and publish standards which advance the technology, increase the. Publication list title standards for steam surface condensers, 10th edition 2006 standards for direct contact barometric and low level condensers, 8th edition 2010 standards for steam jet vacuum systems, 6th edition 2007 standards for closed feedwater heaters, 8th edition 2009 standards and typical specifications for.
Also included is a nozzle, usually of the converging diverging type, through which steam is admitted into the portion of the body referred to as the suction. Customized solution for steam power systems surface condenser. The attached article has a equation english units as given in the standards for steam jet vacuum systems published by heat exchange institute hei. See the hei standards for steam jet vacuum systems an ejector see sketch below consists primarily of a body with a suction port, a venturi shaped diffuser tube, and a discharge port.
Depending on the application, a wide range of variants of these sys. The hybrid gas extraction system ges at kawerau geothermal project, which consist of 2 stages of steam jet ejector and liquid ring vacuum pump, is one of the largest of its type in geothermal use in the world. An introduction to condensers and auxiliary equipment for. Vacuum system air leakage calculation question posted in industrial professionals. Heat exchange institute updates vacuum systems standards. Hei standards for steam surface condensers add1 free download as pdf file. Operating a steamjet vacuum system at steam pressures lower than those specified in the system design will reduce system stability. The design characteristics of air removal equipment are outlined in the heat exchange institute standards for steam surface condensers. Addendum 1 to standards for steam jet vacuum systems, 7th edition. Standards for steam jet vacuum systems the seventh edition of this standard has been developed by the vacuum technology section of the heat exchange institute, inc.
The heat exchange institute hei recently released the 7th edition of standards for steam jet vacuum systems. Product catalogue jet pumps mixers heaters vacuum systems. Vacuum system air leakage calculation question industrial. Scribd is the worlds largest social reading and publishing site. Hei standard for power plant heat exchangers archive. Vacuum pumps and steam jet ejectors this standard covers the. Steam jet air ejectors have a low initial cost, so are an economical means and reliable equipment for producing a vacuum. They are applied in processes such as crystallization, deaeration, drying, cooling, high vacuum distillation and deodorization. Entrapment capture vacuum pump a vacuum pump in which the molecules are retained by sorption or condensation on internal surfaces. The industry standard for removing these noncondensable gases has been steam jet ejectors or a hybrid system of steam jet ejectors and liquid ring vacuum pumps. The ejector design has basic advantages such as absence of moving parts and simplicity of operation. We are also a proud member of hei and regularly contribute to the development and improvement of industry standards.
Ejectorbased systems are particularly appropriate as primary vacuum producers, particularly where motive steam is almost always available. Hei releases updated standards for air cooled condensers. This thesis focuses on finding the optimum operating pressures for a hybrid steam jet ejector system and a hybrid turbocompressor system. The seventh edition of this standard has been developed by the vacuum technology section of the heat exchange institute, inc. Hei 2866 standards for steam jet vacuum systems active details. Standards for steam jet vacuum systems, 7th edition hei 125. The steam ejector utilizes high pressure steam to compress low pressure vapors or gases. In certain low suction pressure applications, a hybrid system consisting of a steam jet air ejector and vacuum pump or a three stage ejector system is used for evacuating the air from the condenser. Standards for steam jet vacuum systems, 7th edition hei 125 standard by heat exchange institute, 2012 amendments available. Steam jet vacuum pumps 2 low or fluctuating steam pressure.
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