Alignment procedure an executable part of the alignment process where alignment is performed in accordance with the defined requirements. A sterntube forms the after bearing for the propeller shaft, and incorporates the watertight gland where the shaft passes through the intact hull. Use this simple and effective procedure for shaft alignment of your rotating equipment. Sep 15, 2009 as the shaft bearings are aligned, the engine is also brought into precise alignment with the shaft. The most secure digital platform to get legally binding, electronically signed documents in just a few seconds. Jul 26, 2014 alignment procedure taking alignment readings step no. While engine alignment is well understood by most marine industry professionals, shaft alignment is far more esoteric and well understood by far fewer folks in.
This laser reference beam passes through the strut tube or cutlass bearing, the stern tube, support bearings, if any, and to the engine or reduction gearbox. Knowing how to perform a precision shaft alignment is important when it comes to maintenance skills. This alignment technique uses a laser mounted in the region of the propeller and projects a laser reference beam forward. You must first take the wobble out of it, then align the coupling flange on. Pdf basic shaft alignment workbook for industrial rotatin. Propulsion shaft alignment method and analysis for surface. Whether you are using dial indicators or a laser alignment tool if you are in the market for either, we have several options here, being able to. The bent shaft affects alignment process by showing improper reading. The data validity rule 1 shown in following equation. The advanced tools of the editor will direct you through the editable pdf. Shaft aligning procedure preliminary checks visually check coupling, pipe hangers, base bolts, coupling spacing etc. Basic shaft alignment workbook for industrial rotatin n1achincrv. The full procedure is beyond the scope of this article, but in short.
Shaft aligning techniques shaft alignment by conventional method shaft alignment by dial test indicator dti shaft alignment by using laser equipment shaft alignment by using computer. A guide to shaft alignment achieving a satisfactory shaft alignment is paramount for the safe and reliable operation of a ship during its lifetime. While engine alignment is well understood by most marine industry professionals, shaft alignment is far more esoteric and well understood by far fewer folks in the industry. Download shaft alignment handbook third edition by john. As a result there may be damages in stern tube bearings, propulsion system, me and eventually gear box. A misalignment of these three components as small as 0. Shafting alignment is performed in several stages, starting with the shaft line.
In nauticus machinery shaft alignment these effects can be carefully considered when designing an optimal shaft line in order to avoid problems in operation. A procedure by which the mass distribution of a rotor is checked and, if necessary, adjusted in order to. Propeller shaft alignment forward alignment approach. The engine is a different matter, because even with a laser you can only align in one plane and there may still be an axial angle. Shafting alignment is performed in several stages, starting with the shaft line design, and includes calculating the elastic line and bearing loads, installation of shafting parts onboard ship in. An essential component of any successful alignment procedure is the determination and. This paper presents a comprehensive alignment analysis process for a long shafting system.
The model considered is a 60 m long shafting system of a ship consisting of 10 bearings, one gearbox and one main engine. The required jackdown load is defined in the shaft. Align the engine coupler to the shaft coupler with less. 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. Bearing clearance radial gap between the shaft and the bearing shell. If, on the other hand, you update your knowledge of shaft alignment techniques and acceptable alignment tolerances, you might be on the way to becoming more reliabilityfocused. 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.
Oct 06, 2014 the shaft should rotate freely with no binding and the shaft should pass evenly through the cutlass bearing with no obvious pressure on any side. The content of this infographic is a basic guide to realign machines. A method of shaft alignment of a main engine shaft in shipbuilding comprising the steps of boring the main engine shaft along the center of the shaft, installing a main engine after a bottom construction has been completed and before a stern frame and an upper portion of the engine room has been built, sighting the shaft line of the main engine. Nov 04, 2010 the full procedure is beyond the scope of this article, but in short. In most ships, the main thrust bearing is located at the forward end of the main shaft within the main reduction gear casing.
If, on the other hand, you update your knowledge of shaftalignment techniques and acceptable alignment tolerances, you might be on the way to becoming more reliabilityfocused. Once the shaft is removed and new cutlass bearings in place you could use a laser to check the alignment, but when you push the shaft back in, you certainly feel if one of the bearings is off center. Once the shaft is removed and new cutlass bearings in place you could use a laser to check the alignment, but when you push the shaft back in, you certainly feel if. As the shaft bearings are aligned, the engine is also brought into precise alignment with the shaft. Sighting through as part of shaft alignment procedure eliza jaryszkami ska west pomeranian university of technology, szczecin, institute of manufacturing engineering, al. The natural deformation of shaft sections is taken into account with rational alignment programmes and coupling conditions can be used to position shaft sections and to check alignment. Requirement of shaft alignment every of shipyards must to meet the recommendations to prevent or minimize disturbances of the engine position, established bearing location, stern tube bearing inclination. I would get all perfectly aligned before launching. For instance, if the inner diameter of the shaft log is 1. Propeller shaft alignment forward alignment approach this alignment technique uses a laser mounted in the region of the propeller and projects a laser reference beam forward. Lloyds register emeas technical investigations provides a comprehensive range of measurement and advisory services to help owners, operators and yards to help to ensure that the best. Installation of the ship propulsion shafting is an integral part of the overall positioning alignment procedure. The shaft should rotate freely with no binding and the shaft should pass evenly through the cutlass bearing with no obvious pressure on any side.
For example, the only correct way to express shaft alignment tolerances is in terms of alignment conditions at the coupling, and we will describe several ways to do this. Compulsory inclusion of propeller loads to be taken into account in the analysis. Shaft alignment, often called coupling alignment, is a process to make two or more rotating shafts colinear, or in the same straight line, both vertically and horizontally. Prop shaft alignment on the hard vs on water sailboat. Prop shaft alignment yearly maintenance item moomba. Produce pdf reports directly from the display unit and. If youve ever aligned your propeller shaft and engine, then youve handled the hardware that connects. It does not just give you all the functions for shaft alignment, it also gives the opportunity to check the machine base and levelness. Shaft alignment training ppt presentation slides sample. Regarding john gross question about how a shaft can be aligned with so many things being so wobbly. Jun 08, 2011 this centers the shaft in the shaft log and gets rid of the wiggle, assuming your cutless bearing was recently replaced. This paper presents an approach to determine the changing displacement of the propulsion shaft due to the vessels hull deflection.
A practical guide to shaft alignment plant services. In some very large ships, however, the main shaft thrust bearing is located farther aft in a machinery space or a shaft alley. Alignment process alignment process consists of the design and analysis, the alignment procedure and measurements. The new avv711pro can also save alignment data to an external thumbdrive and is able to directly print the shaft alignment report to pdf format without the need for an separate laptop. Someone named doug from on here sent them to me last summer shaft alignment procedure completion of this work should take less than 1 hour. Shaft alignment training course ppt presentation and. Pdf modelling of propulsion shaft line and basic procedure of.
The alignment training is suitable for technicians undertaking machine alignment, coupling. Shaft alignment can be done utilizing several methods and tools, such as straightedges, calipers, dial indicators, optics, or laser systems. Skf shaft alignment tool tksa 51 instruction and demonstration duration. The shaft alignment procedure is not expected to start before. Fill out, securely sign, print or email your pump alignment form instantly with signnow. Even experienced yacht people think that if you get the two faces of the propeller shaft coupling exactly parallel, the engine is aligned, but youve got a huge amount of weight, seven or eight feet of shaft and a heavy coupling, hanging out. Service bulletin propeller gearbox alignment procedure description the alignment of your engine, engine mounting plate, and propeller gearbox is critical for a smooth running and long lasting gearbox. Start a free trial now to save yourself time and money. Oct 12, 2017 skf shaft alignment tool tksa 51 instruction and demonstration duration. Reinove the propeller shaft froin the truck by taking out four capscrews at each end holding the flange type bearings to the fitting yokes, being careful not to let the flanged bearings fall off and perinit foreign inatter to enter the rollers. Two forms of sterntube are in use, that most commonly fitted having waterlubricated bearings with the after end open to the sea. I would think if you dont achieve this before launching, its probably too out of whack to expect that another engine alignment after launch will fix. Pump alignment form fill out and sign printable pdf. The alignment training is suitable for technicians undertaking machine alignment, coupling alignment, motor alignmnet, pump alignment, etc.
Shaft alignment training course ppt presentation and machine. Com is a knowledge management km consulting based maritime service provider being established among experienced and skilled professionals in the naval, maritime and offshorerelated services for more than 50years, having a vision and. Phillips screw driver 2916 wrenches torque wrench feeler gauge set crowbar object. The alignment of shaft with the bearing and housing, which is a manufacturing tolerance stackup of the bearing parts and the housing bores and faces. Improper alignment leads to increase of stresses in the shafts and thus on the equipment, which might result in break down of the machine. Shafting alignment procedure considers static and pseudostatic loading of the shafting in order to determine its static response. For this procedure, precalculation is used to find the gap and sag that should exist between couplings, when shaft alignment is correct. Use this stepbystep guide to fill out the pump alignment form swiftly and with ideal precision. Running gear alignment professional boatbuilder magazine. Recent experience reflects concerns on propeller shaft aft bearing performance on some oil lubricated installations, e. Modelling of propulsion shaft line and basic procedure of shafting alignment calculation. Any wrong alignment on the shaft can result in undesirable vibrations and higher operating costs.
The basic procedure for determining vertical alignment of shafting and gears is to calculate, for the cold condition at time of aligning, a shape of shaft line that will. The shaft alignment is simple and can be done without special equipment. If youve ever aligned your propeller shaft and engine, then youve handled the. Spanning over 250 pages, the alignment field guide features articles covering a variety of shaft alignment topics, including common alignment issues, shims and hold down hardware, coupling alignments, belt and sheave alignments, and tips on saving time and money during your alignment procedure. Shaft alignment has in recent years become more of a challenge due to increased power, lower shaft speeds and heavier propellers in combination with a shorter propulsion shaft. Care has been taken by the authors, pruftechnik ltd, in the preparation of this publication. Regarding the shaft alignment design and implementation efforts by the.
Engines, gearboxes and propeller shafts on ships are aligned. The basic procedure for determining vertical alignment of shafting and gears is to calculate, for the cold condition at time of aligning, a shape of shaft line that will produce in the hot operating condition essentially equal loads on the main gear bearings and reasonably equal loads on line bearing. The objective of optimized shaft alignment is to increase the operating life span of rotating machinery. The proper shaft alignment procedure is to secure the. The procedures for the hull deflections estimation and the propeller hydrodynamic loads calculation are discussed. Shaft alignment is process of position two or more shafts that centre lines of rotating shafts, form a single line when the machines are working at normal.
Improper alignment leads to increase of stresses in the shafts and thus on the equipment, which might result in. E720 shaft alignment and geometric measurement easylaser. The dnv gl shaft alignment class notations and revised main class rules for single stern tube bearing installations introduce additional focus on the impact of transient hydrodynamic propeller downwardacting bending moments, which are induced in turning conditions at mcr speed, on the aft most propeller shaft bearing. Bearing clearance and slope verification procedure. Shaft alignment methods explained bright hub engineering.
Aim to have all soft foot readings within 2 mils thou. The correction of shaft alignment saves time and money as misalignment is the most common cause of machine vibration. In addition to the consequences for cavitation at the root sections, since equation 5. To provide an overview of alignment, the discus sion in this. Shaft alignment and propeller shaft aft bearing performance. Computer application for shaft alignment design the shaft. Pdf modelling of propulsion shaft line and basic procedure. With feeler gauge find obvious gaps and fill them with shims, taking care of any rough soft foot condition. This also coincides with evolving trends comprising of larger and heavier propellers operating at a lower rpm and. Pdf specifics of shafting alignmentfor ships in service. The way to complete the online pump alignment form on the internet. Proper shaft alignment is a key issue on ships, especially on large vessels such as bulk carriers, tankers, containerships and gas carriers. For example, the only correct way to express shaftalignment tolerances is in terms of alignment conditions at the coupling, and we will describe several ways to do this.
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