Api standard 617, centrifugal pumps for general refinery services, american petroleum institute. S trade association for the oil and natural gas industry, representing about 400 corporations involved in production, refinement, distribution, and many other. No, rp 686 does not address application of a dualpurpose gasket. Api 686 requirements for pump shim pump engineering. The main purpose of shaft alignment is to make sure that the center line of the motor rotor shaft coincides with the center line of the driven machinery i. Purpose this recommended practice rp is intended to provide recommended procedures, practices, and checklists for the installation and precommissioning of new, existing, and reapplied machinery and to assist with the installation design of such machinery for petroleum, chemical, and gas industry services facilities. We have a wide range of api type pumps available including oh2, oh3, bb1, bb2, bb3, bb4, bb5, vs1, vs4 and vs6. Api standards cite criteria for flatness and coplanar tolerances of the mounting surfaces for rotating equipment. Base plates, or individual sole plates for compressor and driver, should be aligned before grouting on a concrete subbase or anchoring to structural steel supporting members in order to provide a proper. Nema sm23, steam turbines for mechanical drive service, national electrical manufacturers association, washington, d.
Introduction 8 model 3910 installation, operation, and maintenance manual condition action chemicals or hazardous fluids in eyes 1. Api 671 coupling standard coupling answers where the. Ralign driver to pump this alignment figure 12 is to ensure that coupling alignment can be made prior to grouting of the base. Proper pump piping procedure 10 steps pump industry. To provide project engineers with smooth sailing and purchasers with favorable price and lead time, seepex introduced a new range of horizontal pc pumps that are designed based on api 676 requirements the bna pump range fig. Once rough alignment has been completed, remove the equipment pump, motor gearbox from the baseplate. Can you advise me the reason behind minimum 3 mm shimming is must even if we achieved the alignment with 0. Should there be problems in achieving alignment there the base may have to be reworked. This recommended practice rp is intended to provide recommended procedures, practices, and checklists for the installation and precommissioning of new, existing, and reapplied machinery and to assist with the installation design of such machinery for petroleum, chemical, and gas industry services facilities. The alignment of the pump shaft to the drive shaft of the motor, gear, or engine driving the pump is called shaft alignment. The api 617 and 686 standards are quite detailed and specific in regards to support structures and alignment provisions and should be followed. Our vision is to build a digital community through websites, enewsletters, and social media channels that allows pump industry professionals to exchange ideas, news stories, product information, case studies, videos, event information and more. Alignment check methodology for rotary equipment using caesar.
Dear all, a few topics which i considered will interest you guys, regarding the above description. Laser alignment is an essential component of a viable. Aim to have all soft foot readings within 2 mils thou. The initial version of this procedure was published several years ago by me. Api recommended practice 686 process industry practices. Empowering pumps is the information and connection hub for the global pump industry. Motors are foot mounted and frame temperature soak from the shaft centerline relates to vertical thermal offset. The api is an abbreviation for american petroleum institute. Mauricio, the american petroleum institute api has shaft alignment standards api 610 that are used in the petrochemical industry, and i believe the hydraulic institute has developed shaft alignment standards as well. Align before and after the pump and piping are bolted together. Abstract proper alignment of rotating equipment has long been recognized as a prerequisite to safe.
The combination of static loads becomes the mean stress acting on the pipe. Api 686 best practice for installation empowering pumps. Fixed gears have more complex coupling alignment offset. Table of contents a what is alignment b what is misalignment c types of misalignment d method of alignment e symptoms of misalignment f pre alignment checks g tools required for alignment h alignment tolerances. Steam turbines general purpose steam turbines special purpose hydraulic turbines. Code guidelines regarding rotary equipment alignment. Explanation about the pump configurations within the api. Chapter 6 provides guidelines for piping alignment as. Piping stress considerations and practical remedies to overcome. Api standard 610, centrifugal pumps for general refinery services, american petroleum institute, washington, d. Api standard 610, centrifugal pumps for general refinery services. Level the baseplate to a maximum out of level of 0.
A motor with a starting temperature of 70 f is perfectly aligned to the pump shaft it will be driving. Shaft alignment methods explained bright hub engineering. Nearly all component system standards reference api rp 686 2nd ed. Good quality, precut stainless steel shims come in thicknesses, ranging from 1 mil to 120 mils. Api 686 requirements for pump shim artisi mechanical 25 jul 12 20. Specify that bolting which connects pump to pipe must fit without force. Truflo offers a complete range of api 610 11th edition and api 685 2nd edition pumps. Alignment of the shaft is necessary when the motor or driven machinery is new or when it is dismantled due to improper running. The purpose of this article is to give you a explanation about the pump configurations within the api 610. Hold your eyelids apart forcibly with your fingers. A practical guide to shaft alignment plant services. Moreover, as the name suggests, the main purpose of shaft alignment is to make sure that the center line of the motor rotor shaft coincides with the center line of the driven machinery i. In addition to alignment quality and repeatability problems, it can be a cause of machinery vibration, reduce life in electric motors, and cause internal clearance problems in gearboxes and pumps. Achieving proper alignment, however, involves much more.
Api was formed in 1919 as a standardssetting organization and is the global leader in convening subject matter experts across segments to establish, maintain, and distribute consensus standards for the oil and gas industry. The objective of the standard is to ensure a robust installation with minimal softfoot of the mounted equipment. Metallic flexibleelement couplings are the primary type permitted for api 671 applications. Api rp 686 recommended practice for machinery installation. Care has been taken by the authors, pruftechnik ltd, in the preparation of this publication.
During pump to motor alignment, we achieved the alignment with just 0. It should be realized that piping issues directly affect the pump s life and its performance. Soft foot is a common issue when aligning rotating equipment. Purpose this recommended practice rp is intended to provide recommended procedures, practices, and checklists for the installation and precommissioning of new, existing, and reapplied machinery and to assist with the installation design of such machinery for. Tolerance table offers guidelines how accurate should alignment be. We pride ourselves in high quality production of either bare pump or a complex skid assembly. It is not intended as a comprehensive guide to alignment of process machinery, nor is it a substitute for seeking professional advice or reference to the manufacturers of the machinery. This manual provides instructions for the installation, operation, and maintenance of the goulds model 3910 vertical bearing frame inline process pump designed to meet the requirements of the 11 th edition iso 709 of api standard 610.
Bringing the pump to the pipe in one operation and expecting a good pump flange or vessel. Alignment check methodology for rotary equipment using. Api recommended practice 686 machinery installation and. Api sire source inspector rotating equipment is the second certification in the source inspector suite. Good machine installation practices dictate that a good rough alignment between the machines should not necessitate ever having more than 100 mils worth of shims under any machine foot to achieve final alignment within tolerance. This manual shall always be kept close to the units location of operation or directly on the pump set. Revision 0, atex api maxum 610 11 edition centrifugal pump. It can be resolved into a parallel offset at a given point along the fixed machine centerline and angular misalignment in both the horizontal and vertical planes. Meaning of alignment checking alignment checking this term is quite familiar with piping engineers and all construction engineers. Api 686 only gives a recommended angular tolerance and nothing for offset alignment. Ii 71 dial indicator rimandface alignment procedure. Installation, operation, and maintenance manual model 3600 iframe api610 11th edition iso 709 2nd edition to current api bb3 multistage, axially split. Improper alignment leads to increase of stresses in the shafts and thus on the equipment, which might result in break down of the machine.
What alignment tolerances between the piping and machinery nozzles must be achieved before local heating will be used to. Recommended practices for machinery installation and installation design api recommended practice. With feeler gauge find obvious gaps and fill them with shims, taking care of any rough soft foot condition. Api 686 practices shaft alignment free download as pdf file. I cant see anything in api 610 or api 617 for pump or.
American petroleum institute code api rp 686 provides the data for acceptable deviation from the ideal perfect alignment. Shaft misalignment is responsible for as much as 50 percent of all costs related to rotating machinery breakdowns. Alignment check methodology for rotary equipment using caesar ii. During piping installation at the construction site. Centrifugal pumps for general refinery services, american petroleum institute, washington, d. Api standards rotating equipment mounting platebase. Alignment of pumps one of the most important parts of pump setup is making sure that the pump and the drive motor are carefully aligned. First the machines are centered in the hold down holes. The 10 steps outlined in this article reflect modifications.
Since then, a large amount of feedback has been accumulated. Applying one of the balancing quality grades such as iso 1940 and api 617. Sep 11, 2018 the goal and purpose of the pre alignment steps is to control unintended movement that might occur during the alignment process and maximize repeatability. Shaft alignment is a method or procedure by which shafts of machines such as motors and turbines are connected to a generator or pump in proper alignment. Pdf process industry practices recommended practice for. Soft footwhat it is and how to minimize it vibralign. Misalignment may account for over 50% of malfunctions in rotating machinery, leading to problems such as worn or broken couplers, vibration, and excessive wear of bearings, seals and wear rings. In its first 100 years, api has developed more than 700 standards to enhance operational safety, environmental protection. In conclusion, best practices in shimming for machinery alignment and soft foot correction involve some care and attention to detail, the use of high quality, burr free, precut stainless steel shims and good shimming technique.
A summary of the guidance in regards to pipe strain is as follows. Choose your shim supplier with care and keep your shim boxes fully stocked with all available thicknesses, in all the. The goal and purpose of the pre alignment steps is to control unintended movement that might occur during the alignment process and maximize repeatability. Process industry practices recommended practice for machinery installation and installation design api recommended practice 686 second edition, december 2009. Power pumps and api pumps are typically centerline design machines where the pump foot is at or near the shaft horizontal centerline. It is a major cause of repeatability problems in shaft alignment measurements. This certification, developed in cooperation with industry experts, focuses primarily on rotating equipment, including but not limited to. Fixturlaser alignment tools display angular misalignment as a slope rise over run in mils1 the 0. Api 686 requirements for pump shim pump engineering engtips. Only disc couplings and diaphragm couplings can be used in api 671 applications. Alignment tolerances for different pump and alignment companies so far, this article discussed the opinions and research of many intelligent people who work for reputable companies, who spent great amounts of time, money and resources to specify alignment tolerances.
Api 671 couplings are typically specified in critical applications that operate for extended periods of time, are often nonspared, have high torque andor speed requirements. As per the code if the vertical and horizontal deviation of piping flange and rotary equipment flange centerline is within 1. Recommendations for checking rotating machinery installation. Api rp 582 recommended practice welding guidelines for the chemical, oil, and gas industriesapi std 676 positive displacement pumps rotary, third editionapi rp 572 inspection of pressure vessels, third editionansi api std 618 reciprocating compressors for petroleum, chemical, and gas industry. The shafts of the pump and drive unit must be closely aligned. Piping misalignment vibration related fatigue failures final. Aligning your pump and piping correctly can have a big impact on the successful operation of the pump. The alignment of the pump flanges to the connecting piping is called flange alignment. Recommended practice for machinery installation and. Understanding api standards for mounting rotating equipment. Alignment employ laser or reverse dial indicator technology to align pump and motor.
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