This approach is too cumbersome and error- Figure 3-47: Mechanical dial indicator setup Source: A-Line Mfg. Anticipated savings - Years 2, 3, etc. Mounting pads machined parallel within 0. The epoxy sealer shall be tinted contain a color to contrast with the concrete and the grout. Problem incidents caused by dirt and water have been substantially reduced by the pressure differential at the bearing housing seal provided by oil mist lubrication. Chip away defective concrete and laitance, leaving the entire surface of the foundation reasonably rough but level.
Hazardous situations are often created by improper piping analysis and some computer programs cannot handle hot condition calculations correctly. The mixing equipment shall be clean and free of all foreign material, scale, moisture, and oil. After that, the plant saves over one million dollars each year due to avoided repair incidents. Using the system of jack bolts and anchor bolts, Figure 3-21, the mounting surfaces can be re-shaped during the leveling process, but the differing concepts of flatness and level have become confused. After the concrete foundation has been chipped and cleaned, and the baseplate has been leveled, grout forms must be constructed to hold the grout, see Figure 3-24. Highspecific-speed Nss starts above a value of 3,500. Pump alignment center-to-center without paying attention to thermal growth is surely one of the factors that keeps its practitioners in the repair-focused category.
The first can be accomplished by varying the speed of the pump Figure 4-8 while the second requires altering the friction losses by throttling a valve in the pump discharge Figure 4-9. While there may be other low viscosity high strength epoxy grout systems available on the market, the discussion and techniques that follow are based on the flow and pour characteristics of Escoweld 7560. Because of this, an optimum pipeline size may be found, based on minimizing costs over the life of the system. Distortion can either be induced prior to grouting due to poor field leveling techniques, or the distortion can be generated by the grout itself. Using a hand grease gun, the other hole shall be filled with pure unfilled Escoweld 7507 Epoxy with hand grease gun. Some elements of a typical computer input form for pumps were highlighted in Figures 2-21 and 2-22. Flow bypassing was effectively prevented by this design feature and pump mean-time-between-failures significantly extended.
It has been estimated that over 10,000,000,000 of them are in use worldwide. This cleaning shall be done shortly before the leveling of the baseplate and placement of the grout. An input filter is sometimes prescribed by the power company. Ideally, the best bonding surface would be a sandblasted surface with no primer. After governor has taken over, open handwheel fully. It could hardly have cost significantly more to execute and has since proven to give superior service in many installations. One side of the simple grout form is waxed, and the entire grout form is sealed and held in place with caulk.
Alignment Tolerances As is often the case, there is little consensus among machinery manufacturers and users as to acceptable misalignment for pumps, or any other machinery for that matter. This is reflected in Figures 3-42 and 3-43, and also in Figures 3-44 and 3-45. If the piping can be separated into shorter segments for easier cleaning it may be done at the shop. For tracking and verifying proper field implementation, the following piping-related overview material and checklist will prove helpful. .
He is now a senior lecturer at the Nottingham Trent University where he continues to work on micro- and pico-hydro power. A second grout pour is performed to fill the cavity of the baseplate, by using grout holes and vent holes provided in the top of the baseplate. Cement grouts will degrade when allowed to come into contact with lubricating oils and many pumped products. However, it is the job of the machinery engineer to review these standard data sheets for accuracy and completeness. Pump repairs due to bearing failures, per year 521 3. And pump life extension, maintenance cost reduction, and safety and efficiency enhancement opportunities seem to grow.
A refinery has a small steam turbine, foot-mounted, and enveloped in insulating blankets. All epoxy grout systems have a slight shrinkage factor. Flow-disturbing fittings should not be present for some minimum length. The wooden grout forms for the two-pour method are easier to build because of the open top. Here, then, is the proof: Field Installation Cost Comparison The benefits of using a pre-grouted baseplate with the new installation method can be clearly seen when field installation costs are compared. Excessive forces and moments caused the retainer bushing to deflect and the cast iron bearing housing to break.
The operating temperature of the steel casing is 455°F, and the distance from centerline to the bottom of the feet is 18 inches. The pump manufacturer rarely deserves to be blamed, although it is unfortunate that the pump manufacturer is not always knowledgeable in pump failure avoidance. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. In contrast, the two-stage overhung pump of Figure 2-9 employed a gasketed step fit at internal joints 1 and 2. Regardless of the volute design, the mechanical strength of a pump tends to be improved by low actual shaft deflections. Why the same pump model does well at one plant and does not do well at another plant will be described and analyzed.