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. A procedure by which the mass distribution of a rotor is checked and, if necessary, adjusted in order to. If youve ever aligned your propeller shaft and engine, then youve handled the. Two forms of sterntube are in use, that most commonly fitted having waterlubricated bearings with the after end open to the sea. Use this stepbystep guide to fill out the pump alignment form swiftly and with ideal precision. The full procedure is beyond the scope of this article, but in short.
The most secure digital platform to get legally binding, electronically signed documents in just a few seconds. The required jackdown load is defined in the shaft. Improper alignment leads to increase of stresses in the shafts and thus on the equipment, which might result in. The procedures for the hull deflections estimation and the propeller hydrodynamic loads calculation are discussed. Bearing clearance and slope verification procedure. 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. Pdf basic shaft alignment workbook for industrial rotatin. 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. Nov 04, 2010 the full procedure is beyond the scope of this article, but in short. 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.
A misalignment of these three components as small as 0. A guide to shaft alignment achieving a satisfactory shaft alignment is paramount for the safe and reliable operation of a ship during its lifetime. Phillips screw driver 2916 wrenches torque wrench feeler gauge set crowbar object. Modelling of propulsion shaft line and basic procedure of shafting alignment calculation.
An essential component of any successful alignment procedure is the determination and. Compulsory inclusion of propeller loads to be taken into account in the analysis. Sep 15, 2009 as the shaft bearings are aligned, the engine is also brought into precise alignment with the shaft. Regarding the shaft alignment design and implementation efforts by the. To provide an overview of alignment, the discus sion in this. 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. Propulsion shaft alignment method and analysis for surface. This also coincides with evolving trends comprising of larger and heavier propellers operating at a lower rpm and. 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. 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. This paper presents an approach to determine the changing displacement of the propulsion shaft due to the vessels hull deflection. In nauticus machinery shaft alignment these effects can be carefully considered when designing an optimal shaft line in order to avoid problems in operation.
As a result there may be damages in stern tube bearings, propulsion system, me and eventually gear box. Knowing how to perform a precision shaft alignment is important when it comes to maintenance skills. Skf shaft alignment tool tksa 51 instruction and demonstration duration. 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. Bearing load of all main engine bearings and propeller line in service condition to be within specified limits.
Pdf modelling of propulsion shaft line and basic procedure of. A sterntube forms the after bearing for the propeller shaft, and incorporates the watertight gland where the shaft passes through the intact hull. Running gear alignment professional boatbuilder magazine. Jun 08, 2011 this centers the shaft in the shaft log and gets rid of the wiggle, assuming your cutless bearing was recently replaced. Start a free trial now to save yourself time and money. Recent experience reflects concerns on propeller shaft aft bearing performance on some oil lubricated installations, e. Jul 26, 2014 alignment procedure taking alignment readings step no. Download shaft alignment handbook third edition by john. As the shaft bearings are aligned, the engine is also brought into precise alignment with the shaft. Shaft alignment training course ppt presentation and machine. Installation of the ship propulsion shafting is an integral part of the overall positioning alignment procedure. 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. 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. 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.
This paper presents a comprehensive alignment analysis process for a long shafting system. In some very large ships, however, the main shaft thrust bearing is located farther aft in a machinery space or a shaft alley. 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. 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.
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. 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. Alignment process alignment process consists of the design and analysis, the alignment procedure and measurements. Care has been taken by the authors, pruftechnik ltd, in the preparation of this publication. I would get all perfectly aligned before launching. The way to complete the online pump alignment form on the internet. Shafting alignment is performed in several stages, starting with the shaft line. You must first take the wobble out of it, then align the coupling flange on. 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. 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. With feeler gauge find obvious gaps and fill them with shims, taking care of any rough soft foot condition. Alignment procedure an executable part of the alignment process where alignment is performed in accordance with the defined requirements. Any wrong alignment on the shaft can result in undesirable vibrations and higher operating costs.
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. The shaft alignment is simple and can be done without special equipment. Align the engine coupler to the shaft coupler with less. Shafting alignment procedure considers static and pseudostatic loading of the shafting in order to determine its static response. In addition to the consequences for cavitation at the root sections, since equation 5. Regarding john gross question about how a shaft can be aligned with so many things being so wobbly. 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. Engines, gearboxes and propeller shafts on ships are aligned. The alignment training is suitable for technicians undertaking machine alignment, coupling alignment, motor alignmnet, pump alignment, etc. The alignment training is suitable for technicians undertaking machine alignment, coupling. It does not just give you all the functions for shaft alignment, it also gives the opportunity to check the machine base and levelness. 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 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. The correction of shaft alignment saves time and money as misalignment is the most common cause of machine vibration. Shaft alignment training ppt presentation slides sample. Fill out, securely sign, print or email your pump alignment form instantly with signnow. 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. The advanced tools of the editor will direct you through the editable pdf. 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. 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. The objective of optimized shaft alignment is to increase the operating life span of rotating machinery. A practical guide to shaft alignment plant services.
Bearing clearance radial gap between the shaft and the bearing shell. Pump alignment form fill out and sign printable pdf. This alignment technique uses a laser mounted in the region of the propeller and projects a laser reference beam forward. 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. The proper shaft alignment procedure is to secure the. Computer application for shaft alignment design the shaft. 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. Propeller shaft alignment forward alignment approach.
Produce pdf reports directly from the display unit and. E720 shaft alignment and geometric measurement easylaser. Use this simple and effective procedure for shaft alignment of your rotating equipment. Improper alignment leads to increase of stresses in the shafts and thus on the equipment, which might result in break down of the machine.
In most ships, the main thrust bearing is located at the forward end of the main shaft within the main reduction gear casing. 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. For instance, if the inner diameter of the shaft log is 1. 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. 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. 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. If youve ever aligned your propeller shaft and engine, then youve handled the hardware that connects. Prop shaft alignment on the hard vs on water sailboat. 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. The model considered is a 60 m long shafting system of a ship consisting of 10 bearings, one gearbox and one main engine.
Sighting through as part of shaft alignment procedure eliza jaryszkami ska west pomeranian university of technology, szczecin, institute of manufacturing engineering, al. The content of this infographic is a basic guide to realign machines. 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. 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. Basic shaft alignment workbook for industrial rotatin n1achincrv. Pdf modelling of propulsion shaft line and basic procedure. For this procedure, precalculation is used to find the gap and sag that should exist between couplings, when shaft alignment is correct. Oct 12, 2017 skf shaft alignment tool tksa 51 instruction and demonstration duration.
Shaft alignment training course ppt presentation and. Shaft alignment can be done utilizing several methods and tools, such as straightedges, calipers, dial indicators, optics, or laser systems. The data validity rule 1 shown in following equation. 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.
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