Hq=yX:+?d-[${L(-DYN&+hq!G# ePV

#-p Hq=yX:+?d-[${L(-DYN&+hq!G# ePVm:2#F(:mH)RTh0X+2^q~n')l8TbR#!Wc%xI S&;Fwx~>:nC q#e62F3N2!0x rYf, 9tdH[T,^qvtf 8m'nhE'|M4^wP"|2^g?E#uaF}5prZ>kJqSj?%lUlv1yV3G Ensure fixtures are mounted at a position where rotation is possible. The hash mark is installed at the factory during calibration when the bolt is hydraulically stretched to the desired tension. Note that an O ring gage can be used to confirm these values as well. Always confirm shaft or shaft sleeve surface finish, clean seal chamber, and confirm proper spring fits and spring compression when installing a new component seal. They accomplish the task of moving the measurement surface to a more convenient location rather than measuring directly on the shaft or coupling surface. Negative values mean that the movable machine is low, so you will add shims. * Determine the horizontal plotting scale. Be sure that every seal installation uses the vendor supplied job-specific seal drawing reviewed prior to the old seal being removed and before new seal installation. Figure 3.10 Measuring angularity, position #2. These are most often used for rim measurements, but if necessary, can be used for face measurements. When shaft angularity readings are obtained in this manner, the amount of angularity equals the total indicator reading (TIR) divided by the indicator circle diameter. If the shaft is eccentric to the box bore, check the slop, or looseness, in the pump bracket fits. Copyright 2022 Elsevier B.V. or its licensors or contributors. Attach the rim dial indicator. 0000013885 00000 n Note that misuse of equipment can result in costly mistakes. If removed components cannot be refurbished get rid of them only after new spare parts are in hand. A dial indicator should be attached to the shaft and the shaft will be rotated to cover a complete sweep of the seal chamber face. Observe parentheses in the equations. Determine the vertical position of the movable machine using calculation and/or graphing techniques. Tighten bolts in an equal and opposite manner (same tightness first at 3Oclock, then 9Oclock, etc.) In the rim-face graph example below, the DIR offset is -10 mils and the shaft slope is +4 mils over an A dimension of 5. Figure 5-14 shows this conventional method that, except for the sag compensator device, is almost universally employed. Always clean and deburr the mounting surfaces when installing O or V seals. Mounting hardware Mounting hardware consists of the brackets, posts, connectors, and other hardware used to attach a dial indicator to a piece of machinery. William E. Forsthoffer, in Forsthoffer's Proven Guidelines for Rotating Machinery Excellence, 2022, See following Awareness information for our proven pump mechanical seal installation procedure, Set of Hexagonal Wrenches (Allen)Metric and Imperial. Dial indicators Figure 54.15 shows a common dial indicator, which is also called a runout gage. For shaft alignment, we typically use dial indicators with 0.250 0.300 total travel. The two types of face design are balanced and continuous. Note: Normal or standard lift should be the same for all valves for a specific model and type engine. If seal must be installed over damaged shaft surface, assure that seal alignment is correct. We correct for sag in the following manner: In Practical Machinery Management for Process Plants, 1998. When using any of the Fixturlaser Alignment tools the right/left or high/low vs. +/- reference will be the same as illustrated. The primary parts of a dial indicator are the face or dial, the case, and the plunger. Error can be induced due to curvature effect on misaligned components. A dial indicator is an instrument with either jeweled or plain bearings, precisely finished gears, pinions, and other precision parts designed to produce accurate measurements. Industrial maintenance as a service (#imaas) transfers the digital and/or manual management of maintenance and industrial operations from machine users to machine manufacturers (OEMs), while improving it considerably. at the top and bottom vertical parallels, respectively. With the coupling broken, mount the fixture to the stationary shaft or coupling hub.2. at the seal chamber possible. Dial indicators can easily be attached to brackets and, because brackets are adjustable, they can easily be mounted on shafts or coupling hubs of varying size. REGISTER NOW! Set both dial indicators to zero.3. Referring to the illustration below, notice that the offset between the two shafts is 0.020 (0.508 mm), but the TIR is 0.040 (1.016 mm). When the packing is removed, orbiting of the shaft in the stuffing box area may be as much as 0.150 inch F.I.M. 53 0 obj <> endobj xref 53 30 0000000016 00000 n As shim changes are made, check for and take precautions to avoid creating soft foot conditions.Making horizontal corrections. Prior to doing so, a sweep of the seal chamber face is required to assure proper sealing between gasket O ring on seal gland and seal chamber. Always check shim thickness with an outside micrometer. Many mechanical seals are installed on mixers with a bearing support in the seal canister that limits shaft deflection at the seal faces. August 1, 2022. Figures 13-52 shows an example of conventional mixer seal technology. Check Camshaft and/or Layshaft Drive Chain. 0000024162 00000 n These seals have larger radial clearances between the shaft and wider seal faces to prevent over-wipe of the seal faces during standard operation. Attach seal head to shaft/sleeve and assure that set screws are installed on clean and undamaged shaft areas. When reading laser or dial indicator values, the terms of Positive or Negative are used to describe the position of the movable machine relative to the reference centerline. 80% of Reliabilityweb.com newsletter subscribers report finding something used to improve their jobs on a regular basis. Auxiliary flat surface added to avoid curvature-induced measurement error. When interpreting the graph to determine the movable shafts front and rear feet positions in the ertical plane, observe the following rules: 6. Conventional seals designed for mixer canisters with integral bearing support can only tolerate small runouts, less than 0.062 inch. Set the face dial indicator to read zero.3. Sleeve O ring cut during installation, resulting in excessive leakage between shaft and sleeve. Use the horizontal line representing the stationary shaft centerline as the reference. Ensure positive offsets are plotted above the horizontal reference line and negative offsets are plotted below the line.5. Regardless of the specific hardware being used, the following precautions should be observed. Positive values at the feet mean that the movable machine is high, therefore you will remove shims. Record dimensions of removed components and take required pictures of component condition. In Practical Machinery Management for Process Plants, 1997. Make the third vertical line representing the point along the shaft length of the rear feet of the movable machine (RF).Upon completion of the steps above, the graph will look similar to the one shown below. Inspect Power Cylinders with Boroscope. Seal Chamber face flatness should be no more than 0.005 TIR. The pictures below are of the NXA Pro or Ultimate. To avoid this, level the rim measurement surfaces of both posts in coordination and rotate precise 90 quadrants using an inclinometer. Do not attach brackets to a movable part of the coupling, such as the shroud. If the movable shaft is below the horizontal stationary shaft reference line, the shaft is positioned to the left. Use consistent and correct torquing procedures.5. Vertical and horizontal angularity and offset are clearly shown as are the feet position. Re-measure and record final alignment values. 0000024191 00000 n It is possible to take measurements ranging from one-thousandth (0.001 inch or one mil) to 50 millionths of an inch. This method is a clever one for face-mounted brackets. The point that contacts the shaft is attached to a spindle and rack. Record the setting of both dials at 12:00.5. Use. One is by using precisely machined jig posts that give the desired result automatically when mounted on shafts. To construct a scaled Rim-Face graph, perform the following steps: 1. The dial indicator bar sag describes a bending of the hardware used to support a dial indicator or other part which spans the coupling. Confirm that shaft or shaft sleeve surface finish, where secondary O ring or Teflon wedge will ride, is maximum of 32rms, using a comparator. The procedure for the assessment of the flatness deviation with straightedge and dial indicator (Fig. Yp045cN$qht76i'k+.QNMz~"c'P o\ It includes the three PMs: predictive, preventive and proactive maintenance. Brackets eliminate the need to disassemble flexible couplings when checking alignments during predictive maintenance checks or when doing an actual alignment. -#@Ch1!NN\7 45e)>C>SCJ0JYt1 c'kb}LR615rjFWt*%!+~*'Cwk4[?NN$=Ezqo|h=3 n. If excessive clearance is indicated, change out bushing and/or pin. Move the front feet of the movable machine as you watch the rim indicator move to zero.5. Adjust the dial indicators to one-half values.4. Maintenance reliability is, of course, an essential part of any successful business that wants to remain successful. Improper installation of mating ring into the gland resulting in excessive leakage due to improper face contact. The dial is set to zero at position #1, for example, 12:00. The simplest way to eliminate the effects of sag is to dial it into the readings at the initial measurement position. This facilitates the use of the indicator reverse method of alignment. Had the shaft been rotating or slipping in the race the wear would be the full circumference of the shaft. It is desirable to have 360 degrees of rotation. Assure that any fingerprints are removed with alcohol and lint free towel. We have a stationary machine and a moveable machine. Note your horizontal scale. This corrects the error as shown in Figure 5-14. Check the load by simply twisting the inner or outer control caps with your fingers. To plot the offsets, perform the following steps: 2. Dial indicators and mounting hardware are the equipment needed to take alignment readings. Rotabolt: Tensioning a bolt with this device does not require a torque-measuring instrument. Determine and record the reading on both dials.9. 0000004667 00000 n Rust, atmospheric corrosion, or corrosion from leaking gaskets can cause damage to these fits, making it impossible to ensure a stuffing box that is concentric with the shaft. Connect with leading maintenance professionals, reliability leaders and asset managers from the world's best-run companies who are driving digital reinvention. A joint venture between two of the worlds largest steel companies inspired innovative approaches to maintenance reliability that incorporate the tools, technology and techniques of today. Make shim changes to both front feet and both rear feet as needed.3. Proper spring compression check (Working height)Obtain dimension from seal drawing which shows the distance between the back of the seal retainer and the seal chamber face. Height of the supporting fixture required to clear the coupling 4. When we move a machine that is mounted in a horizontal position, such as a pump and motor, we reposition the movable machine by moving in only two planes, vertical and horizontal. To obtain a complete set of as-found readings, perform the steps below: 1. Record the DIF and DIR dial indicator TIR values.To determine offset and angularity from the 3:00 TIRs,use the following rules: Calculating the front and rear feet positions, Positive values mean the foot is high, shims must be removed. Negative values mean the foot is low, shims must be added.Rim-Face Calculation Precautions, 1. If the movable shaft is above the horizontal stationary shaft reference line the shaft is positioned to the right. This mark represents the point where the rim dial indicator contacts the shaft or coupling hub and is labeled: DIR. Count the number of squares in the plane of the front and rear feet to determine the position and corrections needed. R Keith Mobley, in Plant Engineer's Handbook, 2001. will greatly reduce the life of the mechanical seal. Install the seal head carefully being sure not to damage the secondary O ring, or the ID of the Primary ring on the shaft/sleeve. Observation of such measurements should be recorded to the nearest 1/16 in. Utilize the following steps to correctly install and lubricate Mating Ring O ring: Refer to the Seal Drawing and assure that the proper O ring material and size will be installed. 2. Standard graph paper is about 10 inches across. Wipe with alcohol using a lint free cloth if necessary. 0000002053 00000 n Figure 13-52. Have a clean area available for the components and assure that there are no fingerprints, oil, or grease on the primary seal faces. To measure horizontal misalignment, perform the following steps: 2. Check Lobes, Camshaft, or Crankshaft. The "C" Dimension is the distance between front and rear foot bolt centers. Figure 3.4 Determining bar sag, zero at 12 oclock. The other offset point is derived from the face dial indicator (DIF) reading andthe A dimension. 13.32. Fluid Cleanliness is a Reliability Achievement Strategy as well as an asset life extension strategy. 0000005795 00000 n 0000012693 00000 n Their flat measurement surfaces can introduce an error in the case of a gear or gridmember coupling turned in such away that backlash is present. bearing of the blower mounted to a base. Gw`UYjw_"aiJ`-zF;M6FAAh*byw1P \lya%GHOru9"r{DU`8D"Fekv[.xeCDHU}+SoQ6j;6*a9dX (Z@"(s #mQ,R,MiXvY*bAD}q^ .=4 Assume, for example, that the scale reading was 7.5lbs. Numerous attempts have been made by fixture manufacturers to minimize the amount of sag that occurs; however, none have been successful in eliminating it for all alignment situations, only in minimizing it. Plot this point counting from the DIR offset point! Check Condition and ClearanceMaster Rod Bearings. When viewing the horizontal plane, typically from the driver point of view, positive is to the right of the reference centerline and negative to the left of centerline. If it is not kept to a minimum, it is often not repeatable and, therefore, introduces different amounts of error. If the movable shaft is below the horizontal stationary shaft reference line, the shaft is too low. MurrayJr., in Centrifugal Pumps (Second Edition), 1992. Measure the distance from the stationary indicator plunger to the center-line of the rear feet of the movable machine. Stiffness of the fixture hardware materials Measuring & Interpreting Vertical Misalignment. Figure 3.9 Measuring angularity, position #1. Both of these devices mechanically monitor the bolt elongation during tensioning like a micrometer or dial indicator. A possible remedy for this condition is welding the corroded area and re-machining to proper dimensions. Precut shims aren't always what they're marked; many shim manufacturers designate shims with the nominal thickness.4. There are two ways to eliminate these last two inclined-plane errors. The rear feet are positioned 6 mils too high; shims need to be removed from both rear feet. Rotate the dial indicators to 12:00.2. 6. When adjusting the movable machine, while in the live screen, and the foot values are increasing, move the other way! To measure offset using dial indicators, a fixture bracket is attached to one shaft and the dial is setup to contact the other shaft. 1. The "B" Dimension is the distance from the rim indicator to the front foot bolt center. Rim readings are obtained as the shafts are rotated and the dial indicator stem contacts the shaft at a 90 angle. The "A" Dimension is the diameter of face indicator travel. 0000012765 00000 n To measure angularity using dial indicators, a fixture bracket is attached to one shaft and the dial is set-up to contact the face of the other coupling hub. Always use the largest scale possible. Draw a horizontal line at the center of the page. Make a vertical line on the extreme left of the horizontal line. If gross misalignment is not present, and if coupling and/or shaft diameters are large, which is usually the case, accuracy will often be adequate. At turns out there was a .003 shaft deflection due to a loose fit between the bearing collar and shaft. Attach the face dial indicator. Check Condition and Clearance of Power Piston Articulated Pin Bushings. COST: The cost differential between the MagBolt and the Rotabolt appears to be, on average, $60, with the MagBolt being the most cost-effective. 13.32) is as follows: Fig. To correct horizontal misalignment, follow the steps below: 1. of the shaft at the face of the seal chamber (Figure 13-51). Malcolm G. Turn the graph paper so that the long side is horizontal.3. Next, locate the sling in the same relative position as before and, while observing the scale, apply an upward force so as to repeat the previous scale reading (assumed 7.5lbs in our example). 4. As the shaft rotated, the bearing race would wobble axially on the shaft causing the wear. Weight of the dial indicator and other parts that are overhung. Then fit the Bearing bracket and shaft up against the casing and mark (with bluing pen) the point on shaft or sleeve directly below the seal chamber face. 3. By continuing you agree to the use of cookies. If the face dial contacts the coupling face directly, ensure the plunger of indicator contacts the coupling near its outer edge. Move the rear feet of the movable machine as you watch the face indicator move to zero.6. Adjust idler to tighten chain when needed. In most cases, however, this error is not enough to bother eliminatingit is easier just to make a few more corrective moves, reducing the error each time. Dismount fixtures from the machine shafts and remount on a rigid mandrel. The reason is that as the fixtures are rotated from 12:00 to 6:00 while mounted on the machine, the reading given includes a combination of sag and misalignment.

• Simple Gold Band Engagement Ring
• Do Psd Sports Bras Have Padding
• Clear Pouch Organizer
• James Avery Key Of Promise Charm
• Heaven Mieko Kawakami Paperback
• Mejuri Bold Diamond Eternity Ring
• 8mm Cuban Link Chain 20inch