s will allow for partial replacegold necklace for teenage girl

This will allow for partial replacement and can be used with broken existing anchor bolts. These seals have larger radial clearances between the shaft and wider seal faces to prevent over-wipe of the seal faces during standard operation. 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. 0000002053 00000 n The vertical scale is typically 1 mil (0.000) per division. Use dial indicator and bar to measure clearance. Always check shim thickness with an outside micrometer. The same problem would be present in a jig post with a curved measurement surface, if the surface is not concentric with the shaft center. Measuring Angularity With Face Dial Indicators 1. Figure 3.4 Determining bar sag, zero at 12 oclock. Observation of such measurements should be recorded to the nearest 1/16 in. If the face dial contacts the coupling face directly, ensure the plunger of indicator contacts the coupling near its outer edge. of the shaft at the face of the seal chamber (Figure 13-51). Plot the second offset point using the shaft slope (Face TIR / A dimension). 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). 80% of Reliabilityweb.com newsletter subscribers report finding something used to improve their jobs on a regular basis. 0000001797 00000 n Turn the graph paper so that the long side is horizontal.3. 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. Rotate the dial indicators to 3:00.6. REGISTER NOW! will greatly reduce the life of the mechanical seal. Determine and record the reading on both dials.9. Record dimensions of removed components and take required pictures of component condition. Figures 13-52 shows an example of conventional mixer seal technology. Set the face dial indicator to read zero.3. Positive values at the feet mean that the movable machine is high, therefore you will remove shims. Re-measure and record final alignment values. When shaft offset readings are obtained in this manner, the total indicator reading (TIR) is twice the amount of offset. Rotate the dial indicators to 12:00.2. Also observe the following rules: To correct vertical misalignment, follow the steps below: 1. The "C" Dimension is the distance between front and rear foot bolt centers. Figure 3.7 Measuring offset, position #2. at the seal chamber possible. Each in. Figure 3.5 Determining bar sag, reading at 6 oclock. Move the front feet of the movable machine as you watch the rim indicator move to zero.5. Assure shaft surface is clean and free of any burrs and carefully install sleeve being sure O ring is not damaged. This article highlights the hidden trap of performance management systems. 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. Auxiliary flat surface added to avoid curvature-induced measurement error. 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. Note: Do not lubricate O ring. ; ^P - J000p11D73|`fX!10met z_ (h]r"20q33.a|(P 44&'~NFVfitg3" sx=@ _ endstream endobj 54 0 obj<>/Metadata 51 0 R/Pages 50 0 R/Type/Catalog>> endobj 55 0 obj<>/ColorSpace<>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>>/Type/Page>> endobj 56 0 obj[/ICCBased 67 0 R] endobj 57 0 obj<> endobj 58 0 obj<> endobj 59 0 obj<>stream Rotate the fixtures to the 6:00 position and read the amount of sag. Never attach the fixture to the flexible portion of the coupling. Measuring Angularity With Face Dial Indicators 2. 0000024162 00000 n Stiffness of the fixture hardware materials Determine the horizontal plotting scale. 0000012580 00000 n For clamp-on brackets, however, it would be easier and more common to attach them to a horizontal pipe on sawhorses and roll top to bottom. We had replaced bearings on this fan and with in a month the bearings had failed, and on one end of the fan shaft the shaft was wore down about an 1/8 only on one side of the shaft? It could be viewed as representing the vertical position (as viewed from the side) or the horizontal position (as viewed from above). This is the case regardless of the Fixturlaser tool you are using. 4. 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. 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. Plot the offset from the rim dial indicator on line DIR. Figure 13-53. Jig posts, although useful, can also cause problems if not handled properly. With the dial indicator set up as described above, place the indicator stem well into the bore of the stuffing box. 0000024191 00000 n Do not attach brackets to a movable part of the coupling, such as the shroud. If making live vertical corrections, for machines with adjustable chocks, the coupling and foot values are the position of the moveable machine and the arrows show whether to remove or add shims. 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. 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. Install the stationary seal face into gland evenly to assure face is not cocked. Stationary O ring checksConfirm proper material, durometer, and inspect for discontinuities. 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. Use a torque wrench for critical component bolt torques and always refer to the OEM drawings for any specific torque requirement BEFORE referring to a general torque table! If the outer cap turns, the bolt has exceeded its upper design limit. As shim changes are made, check for and take precautions to avoid creating soft foot conditions.Making horizontal corrections. If removed components can be refurbished, immediately initiate procedures for this action. Make a second vertical line representing the point along the shaft length of the front feet of the movable machine (FF).7. The point that contacts the shaft is attached to a spindle and rack. 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. Had the shaft been rotating or slipping in the race the wear would be the full circumference of the shaft. 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. Figure 13-51. Always install nuts after thorough cleaning, deburring, and prelubrication. Improper installation of mating ring into the gland resulting in excessive leakage due to improper face contact. Move the dial indicator and holder to the next foot to be checked and repeat the process. R Keith Mobley, in Plant Engineer's Handbook, 2001. FREE 1Hour Virtual Uptime Elements Introduction. Before obtaining alignment measurements, determine dial indicator bar sag of the rim dial indicator and ensure dial indicator readings are valid and repeatable. By continuing you agree to the use of cookies. Instead, only measure and record the normal lift of the valve stem at the top of each power cylinder head. They are not designed for direct attachment to a shaft or coupling that must be rotated to obtain the alignment readings. Inspect the rotating head assembly as follows: Secondary O ring in pusher sealInspect for discontinuities, confirm proper material and durometer. The largest horizontal scale will be the machine distance divided by the page width. The "B" Dimension is the distance from the rim indicator to the front foot bolt center. 2. 0000006202 00000 n Always match mark components and note location relative to fixed machine surface and note standoffs and rotor running position reference prior to removal of any components. Conventional seals designed for mixer canisters with integral bearing support can only tolerate small runouts, less than 0.062 inch. Rotate the dial indicators to 9:00.10. This method is a clever one for face-mounted brackets. Wipe with alcohol using a lint free cloth if necessary. 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. Note: If sleeve O ring is installed, confirm proper material, size, and durometer, and apply a small amount of Krytox or equal lubrication and install. Attach the rim dial indicator. Using a ruler or straightedge, draw a line through the two offset points that extends to the rear feet of the movable machine.2. Failure to tighten the nuts/caps crews properly can cock the mating ring, which will not allow for proper contact between the faces and result in excessive leakage between the seal faces. To eliminate this, the post surfaces must be axially parallel to the machine shafts. Therefore, the sag correction to the total indicator reading is double the indicated sag and must be algebraically subtracted from the bottom vertical parallel reading, that is, (2) (0.004)=+0.008 correction to bottom reading. Figure 5-15. Confirm that shaft or shaft sleeve surface finish, where secondary O ring or Teflon wedge will ride, is maximum of 32rms, using a comparator. Georg Henzold, in Geometrical Dimensioning and Tolerancing for Design, Manufacturing and Inspection (Third Edition), 2021. Note that an O ring gage can be used to confirm these values as well. Use consistent and correct torquing procedures.5. Position the indicator plunger(s) at the 12:00 position and set the dial(s) to zero. The bending action occurs as a result of gravity and cannot be totally eliminated in almost all cases of alignment. This will assure an even press fit and proper seal between O ring and mating ring. 0000013283 00000 n To plot the offsets, perform the following steps: 2. 3. 4. Heinz P. Bloch P.E., Fred K. Geitner P.ENG., in Machinery Component Maintenance and Repair (Fourth Edition), 2019. Regardless of the specific hardware being used, the following precautions should be observed. Donald M. Harrison, in The Grouting Handbook, 2013. Sleeve O ring cut during installation, resulting in excessive leakage between shaft and sleeve. The dial indicator plunger must be centered for equal positive and negative travel.Fixture Mounting Precautions. When interpreting the graph to determine the movable shafts front and rear feet positions in the ertical plane, observe the following rules: 6. The dial indicator bar sag describes a bending of the hardware used to support a dial indicator or other part which spans the coupling. Eccentricity alters the hydraulic loading of the seal faces, reducing seal life and performance. Figure 3.9 Measuring angularity, position #1. In Practical Machinery Management for Process Plants, 1997. 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. Contaminated Faces can affect face flatness, resulting in excessive leakage. This article addresses the best maintenance strategy for assets by using ACA techniques. The graph below could be viewed two ways. This error can usually be recognized by repeated failure of top-plusbottom (T + B) readings to equal side-plus-side (S + S) readings within one or two thousandths of an inch, and by calculated corrections resulting in an improvement which undershoots or overshoots and requires repeated corrections to achieve desired tolerance. The "A" Dimension should be slightly less than the coupling diameter. Just releasedMRO Best Practices Special Report - a $399 value! Document as-found results using a format similar to that shown below. This corrects the error as shown in Figure 5-14. This dimension is measured parallel to the shaft.3. Have a clean area available for the components and assure that there are no fingerprints, oil, or grease on the primary seal faces. We correct for sag in the following manner: In Practical Machinery Management for Process Plants, 1998. Ensure you divide the Rim Dial TIR by 2 to obtain an offset value. 0000012693 00000 n The dial indicator plunger must be centered for equal positive and negative travel.5. The "A" Dimension is the diameter of face indicator travel. The two types of face design are balanced and continuous. The pictures below are of the NXA Pro or Ultimate. 53 0 obj <> endobj xref 53 30 0000000016 00000 n As the plunger moves into the case, the needle travels clockwisegiving a POSITIVE reading. Draw a horizontal line at the center of the page. 0000013813 00000 n Maintenance reliability is, of course, an essential part of any successful business that wants to remain successful. Lubricate the O ring with Krytox or equal lubricant. Conventional mixer seal clearances. 0000004000 00000 n Always follow suppliers assembly procedures when installing new components and make sure that the new part is the correct OEM part designation. If removed components cannot be refurbished get rid of them only after new spare parts are in hand. Next, mount the alignment fixture on the coupling hub with the dial indicator plunger touching the top vertical rim of the opposite coupling hub. 3. A possible remedy for this condition is welding the corroded area and re-machining to proper dimensions. August 1, 2022. @_p7A&oHNr$4B" !F+-\!n4]JitlK&Ce`E;; VNl5HcQ6t SZKMY8se< Always find tools, measuring instruments, and materials prior to start of job. To correct horizontal misalignment, follow the steps below: 1. Adjust idler to tighten chain when needed. Perform operations inside parenthesis first.4. straightedge in position C1A5, supports adjusted to 0; straightedge in position A1C5, value of B3 from step 2 aligned and straightedge at the ends aligned to equal distances; the two diagonals define the plane embodiment; measurements A1 and C5 registered; straightedge in position A1C1 aligned to the already registered measured values A1 and C1, B1 measured and registered, etc. Set the face dial indicator to zero.4. Copyright 2022 Elsevier B.V. or its licensors or contributors. Measuring Angularity With Face Dial Indicators. 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. Tools and materials required should have been identified in prejob planning. Measure the O ring to assure it is the proper size as follows: O ring: Ring outside diameter and thickness. Measuring & Interpreting Vertical Misalignment. Seal Chamber face flatness should be no more than 0.005 TIR. Read instructions in OEM (Original Equipment Manufactures) manual for removal of components before attempted removal and have the job-specific manuals and drawings out at the jobsite during work. The cost of this unit is approximately $150. To determine sag, install the dial indicators on the alignment fixture in the same orientation and relative position as in the actual alignment procedure with the fixture resting on a level surface as shown in Figure 5-13. One is the offset measured in the plane of the rim dial indicator (DIR). 0000013689 00000 n For shaft alignment, we typically use dial indicators with 0.250 0.300 total travel. Always assure that all components within the flush system have been cleaned or replaced when changing out a mechanical seal as dirty components (cooler, seal pot, plugged orifice, etc.) Mixer seal with increased runout capabilities. 0000005521 00000 n of bolt projection above the nut will decrease the accuracy by approximately 5%. In Practical Machinery Management for Process Plants, 2005. Assure that all springs (if a pusher seal) are sitting upright and have not been dislodged from their counter-bores. This movement is transmitted to a pinion, through a series of gears, and on to a hand or pointer that sweeps the dial of the indicator. Check Condition and Clearance of Power Piston Articulated Pin Bushings. Dial Indicator Signs 2 Dial Indicator Signs 3. 2022 Certified Reliability Leader Workshops by Reliabilityweb.com, 2022 Certified Maintenance Manager Workshops by Reliabilityweb.com, International Maintenance Conference (IMC) 2022, Job Postings for Maintenance and Reliability Professionals, Free eBook: 11 Problems With Your RCA Process and How to Fix Them, Alignment, Vibration, Balancing and Ultrasound Training mapped to UPTIME ELEMENTS, Asset Performance Management and Reliability Software. Seal chamber face TIR should be checked with dial indicator on shaft. -#@Ch1!NN\7 45e)>C>SCJ0JYt1 c'kb}LR615rjFWt*%!+~*'Cwk4[?NN$=Ezqo|h=3 n. With a small sling and scale, lift the indicator end of the fixture so that the fixture is in the horizontal position. Long spans between coupling halves may cause the dial indicator fixture to sag measurably because of the weight of the fixture and the dial indicators. The plunger is a spring loaded part that can be depressed into the case causing the dial to move clockwise. Make a vertical line on the extreme left of the horizontal line. This unit can be purchased as a complete assembly as shown in (Figure 2.21) or as individual components. Insert boroscope into cylinder, and examine cylinder wall, valves and/or ports for abnormal conditions. 0000001831 00000 n If it is not kept to a minimum, it is often not repeatable and, therefore, introduces different amounts of error. 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. 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. 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. It is helpful if this line is on top of one of the bold lines. Always assure that a clean undamaged shaft surface is available when seal set screws will fasten to the shaft. These are most often used for rim measurements, but if necessary, can be used for face measurements. Consult the job-specific seal drawing regarding the allowed use of lubricant and the type required. 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. 0000000896 00000 n Rotate the dial indicators to 9:00 and zero them.2. To measure the A, B, & C Dimensions, follow these steps. If, however, major misalignment exists, and/or the rim or shaft diameters are small, a significant error is likely to be present. Assure that any fingerprints are removed with alcohol and lint free towel. 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. To measure offset using dial indicators, a fixture bracket is attached to one shaft and the dial is setup to contact the other shaft. Intelligent asset management, asset condition monitoring and reliability in a single conference and expo! Both of these devices are precalibrated for the ultimate load or tension required. It includes the three PMs: predictive, preventive and proactive maintenance. The total travel (all the way out to all the way in) varies depending on the particular indicator model. To construct a scaled Rim-Face graph, perform the following steps: 1. We use cookies to help provide and enhance our service and tailor content and ads. With the coupling broken, mount the fixture to the stationary shaft or coupling hub.2. Mixer shaft orbiting, i.e., operating with excessive runout. 0000001941 00000 n If seal must be installed over damaged shaft surface, assure that seal alignment is correct. 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. Using this specific methodology, sag error applies equally to the top and bottom readings. Utilize the following steps to correctly install a component mechanical seal: Refer to the Mechanical Seal Drawing and obtain all required mechanical seal components. 5. When we align equipment, we are aligning the rotational centerlines of the shafts. Deviations from this value are an indication of worn lobes on the camshaft, and appropriate repair steps should be initiated. If the inner cap turns, the bolt has lost its minimum designed preload. Set the rim dial indicator to the sag value.4. Note: Assure all piping/tubing is isolated from flush/quench ports. Ensure positive offsets are plotted above the horizontal reference line and negative offsets are plotted below the line.5. Figure 5.8 The offset is half the TIR (Total Indicator Reading). Ensure proper horizontal and vertical scaling techniques are consistently used.2. Gw`UYjw_"aiJ`-zF;M6FAAh*byw1P \lya%GHOru9"r{DU`8D"Fekv[.xeCDHU}+SoQ6j;6*a9dX (Z@"(s #mQ,R,MiXvY*bAD}q^ .=4 Rotate the dials to 12:00 and ensure both dials return to their original setting. trailer <]>> startxref 0 %%EOF 82 0 obj<>stream Ensure that all spare parts taken from inventory are properly issued to trigger reorder. For this method to be fully effective, rotation should be performed at accurate 90 quadrants, using inclinometer or bubble-vial device. Note that if back of mating ring is visibly not flat, the same result can apply. Record the setting of both dials at 12:00.5. Acoem USA is a leading supplier of efficient technology solutions for industrial, environmental, and security applications. The plunger is fully extended out of the case if no pressure is applied to it. Many mechanical seals are installed on mixers with a bearing support in the seal canister that limits shaft deflection at the seal faces. and be sure not to over tightenNo Cheater Bars or Sledges! Visit our library of educational videos, podcasts, and more. 4. To determine sag, perform the steps below: 1. Once the amount of sag is determined, you must properly eliminate its adverse effects on all vertical offset readings. Rotate the fixture to 12:00.4. Applying lubricant to secondary seals which can enter primary seal face areasThe same results apply as before. Dial indicators are measuring devices designed expressly to measure relative position. at the top and bottom vertical parallels, respectively. Malcolm G. For this reason, the primary seal faces must be free of fingerprints, oil, and/or grease. During installation, it is critical that these bolts be installed at an elevation that will allow only a few threads (three to four) to protrude above the top of the nut. Count the number of squares in the plane of the front and rear feet to determine the position and corrections needed. To avoid this, level the rim measurement surfaces of both posts in coordination and rotate precise 90 quadrants using an inclinometer. The plunger moves a needle clockwise when pushed in and counter clockwise when let out. Dial indicators and mounting hardware are the equipment needed to take alignment readings. Shaft run-out or orbiting is measured by using a dial indicator and measuring the F.I.M. TIR should be no more than 0.005. Three Things You Need to Know About Capital Project Prioritization. To measure vertical misalignment, perform the following steps: 2. 0000023818 00000 n In any event, let us assume that we obtain readings of 0 and +0.160in. 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. The rear feet are positioned 6 mils too high; shims need to be removed from both rear feet. This where the pictorial representation is helpful. Negative values mean that the movable machine is low, so you will add shims. A way to minimize this error is to use jigs, posts, and accessories which square the circle. Here we attach flat surfaces or posts to the curved surfaces, and level them at top and bottom dead center. In addition, certain oils can set-up like adhesives and pull material out of the carbon primary ring faces after start-up, resulting in premature seal failures. Install gland to seal chamber using opposite and even tightening technique. As long as the amount of bar sag is known and is consistent, it can be compensated for during the alignment process. Any bolt receiving these devices must be drilled and tapped in its center on the nut (top) end for positive anchoring of the device at a depth within the bolt to allow for accurate stretch measurement. Install the Mating Ring using a Press and a piece of cardboard between press and mating ring. Let us assume, for example, that we observe a dial indicator reading of 0.004in. The positive or negative signs (+/-) for the displayed values refer to position and the value is the distance from the reference centerline at that point. Determine and record the reading on both dials.7. Also note any observations in writing for RCFA assistance. This mark represents the point where the rim dial indicator contacts the shaft or coupling hub and is labeled: DIR. Brackets eliminate the need to disassemble flexible couplings when checking alignments during predictive maintenance checks or when doing an actual alignment. xb```e``~" Y864u008 deb2cCc1WtWm>k}K3+Z:y;bv!E2u^3,i CT\ The number of set up options are too numerous for this discussion. Rim readings are obtained as the shafts are rotated and the dial indicator stem contacts the shaft at a 90 angle. If this is not possible, carefully deburr with a file and smooth out with emery cloth. Figure 3.3 Positive readings when the plunger moves into the case, negative when the plunger moves out. It uses a finger-operated indicator; however, this device can have one or several hash marks permanently stamped into the head of the bolt. If excessive clearance is indicated, change out bushing and/or pin. This article takes you on their journey. Inspect Power Cylinders with Boroscope. bearing of the blower mounted to a base. MurrayJr., in Centrifugal Pumps (Second Edition), 1992. Dismount fixtures from the machine shafts and remount on a rigid mandrel. 2. Remove shaft and Bearing bracket from casing and mark the dimension where the back of the retainer sits when assembled. Remove spark plug or gas/air injection valve. 0000013355 00000 n The shift in forces during rotation can cause movement of the magnetic base and erroneous readings. Always clean and deburr the mounting surfaces when installing O or V seals. It is important to note that indicator bar sag cannot be determined from a reading taken by rotating the shafts. If the shaft is eccentric to the box bore, check the slop, or looseness, in the pump bracket fits. 0000008067 00000 n Use the horizontal line representing the stationary shaft centerline as the reference. If any leaks are observed, consult Seal Vendor immediately. Consult the seal vendor for the proper pressure if static limit is not indicated on seal drawing. Figure 13-53 shows the same seal design with greater runout capabilities. Obtain graph paper with 10 divisions between bold lines.2. Fluid Cleanliness is a Reliability Achievement Strategy as well as an asset life extension strategy. Check Camshaft and/or Layshaft Drive Chain. In the vertical plane, positive refers to above the reference centerline, and negative refers to below the centerline.