Should what so called hydraulic load be considered ? Should all fluid-filled piping to the first supporting hanger be considered ? But I failed to find a reference anywhere to indicate what weights should be considered when selecting the spring other than the pump/motor assembly weight. However, all of them talks about the type and deflection of the springs. The base size, vibration spring mount, etc all comply with almost all vibration isolators manufacturers recommendations as well as ASHRAE standard.Īll pumps manufacturers as well as vibration isolators manufacturers suggest say that the inertia base must be extended to support the pipe elbow.
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RE: how to calculate loads for selecting vibration spring mounts on pump inertia base nabilbasha (Mechanical) I wonder if that pipe work support is making the pump base to rigid and preventing the mounts from doing there job. Another point just looking at the photo's of the pumps, on the discharge side, the pipe work support connects directly to the pump base which means that the two vibration mounts at the front see a greater than those at the rear, yet that sheet shows the load divided equal between the 4 mounts. Normally there should be no load transferred to the pump inlet or outlet flanges via pipework, so in my opinion the mass of the motor, pump and pump base should be considered. I'm curious as to why you think the wrong spring dampers are fitted and are causing a problem particularly if there oversized as you say. I found this that might help you better:. How long have these pumps been in service? If these pumps have run awhile maybe some of the bolts have worked loose, although they look quite new. Usually poor alignment of pump/motor shaft is one the major cause's of vibration and another is poor foundation coupled with not the correct pre-tension in the fasteners,not all installations have vibration mounts I have just overseen about 20 motor/pumps sets installed in a steel plant without vibration mounts. RE: how to calculate loads for selecting vibration spring mounts on pump inertia base desertfox (Mechanical) 19 Apr 13 20:44
the spring should ONLY be sized based on the weight of pump/motor assembly and concrete base. Also, if the weight of the elbow and valves should be considered, because naturally the pipe should be suspended so the pump is not carrying any weights. I have not seen any reference anywhere to include what the contractor refer to as the Hydraulic Weight or the equation used! Or even if it should be considered as part of the weights/loads exerted on the spring. I asked the contractor to show me his calculation and he gave me the sheet attached in my first message thread. I intend of course to laser check alignment, coupling, bearings, etc but I am suspecting that wrong spring isolator is being used (over sized). I have 6 inch suction & discharge end suction centrifugal pump with 75hp motor 1750RPM controlled by variable speed drive. Note, I am not designing the foundation from scratch but rather trouble shooting existing pump vibration problem. However, it does not address the total weight/loads the spring would be subjected to.
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The info you gave me is good to design the inertia base and determine its weight, etc plus the Natural frequency so I could also decide the deflection rating of the spring isolator under the base. The red parts have the same durometer (hardness) as the Black parts and differ only in their actual appearance (color) and the fact that they're NOT graphite impregnated like the Black parts.Sorry to trouble you buddy, and I appreciate your support. I thought that the RED parts were harder and more performance oriented? Aside from the actual color and the lack of being Graphite Impregnated - the red parts are essentially the same as the black. The Red parts do not have this characteristic. This serves to help self lubricate the bushings.
The only difference between the red and black parts is that most Black Energy Suspension parts are Graphite Impregnated. Made of rugged Energy's HYPER FLEX performance polyurethane material and the hardware is heavy duty for lasting durability. Replaces that original, short lived and too soft rubber. Your vehicle's sway bar system will work at its maximum efficiency! Please check the sizes on the image above before ordering these bushings for your car! Energy Suspension Style A Coil Spring Isolator KitĮnergy Suspension Polyurethane Sway Bar Bushings improves handling, are low cost, and installs easily!
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