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Diesel generator vibration mounting

09/10/2022 5:58 AM

Dear all,

A diesel generator 2750 kVA 11 kV with weight about 30 tons installed with vibration mounting improperly without dynabolt. Please see fig. A for recommended installation with dynabolt and see fig. b actual condition without dynabolt-modify with stopper. My question, looking at the actual installation how safe is it and how long will the stopper plate stand, and what the possibility occurred during machine running.

Thank you in advance

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Guru

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#1

Re: Diesel generator vibration mounting

09/10/2022 1:56 PM

This appears to be a "home brew' mounting fixture and the workmanship quality seems to be lower than my backyard Saturday afternoon projects. A few of the things I noticed are:

  • Some of the weldment parts seem to have been cut with a hand held cutting torch or plasma cutter and not cleaned up.
  • Welding seems to have produced a lot of black smoke, possibly there was some galvanized metal in the weld?
  • You seem to have something like 1/4-20 or M6 size yellow chromate threads coming up from the concrete. In my limited experience I have not seen yellow chromate wedge anchors. I would have expected something like a 3/8" (or similar metric) electro-galvanized thread sticking up from a wedge anchor. Are these just threaded rod sticking out of lead anchors?
  • The other two mystery bolts are much larger in diameter and appear to be zinc plated. The mixing of materials seems random.
  • There appears to be 1/2" (12mm) fiberglass reinforced shipping tape around the springs. That seems like an odd component in a final installation.
  • Your picture and your fixture don't match well at all.

I'm not an expert, but I'll suggest that you have more to be concerned with than just the idea that a bolt might be missing.

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#3
In reply to #1

Re: Diesel generator vibration mounting

09/10/2022 8:25 PM

I like the way you said "home brew" .

We didnt know how the local workshop man welded and the mounting is not ground dynabolt as per installation guidelines. So their idea to hold the mounting movement during EDG running is by installed stopper plate around of it.

Appreciated for your concerned and respond

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Guru
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#2

Re: Diesel generator vibration mounting

09/10/2022 6:10 PM

How easy is it to get on the phone to the original equipment manufacturer and order the correct part as a direct replacement?

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#4
In reply to #2

Re: Diesel generator vibration mounting

09/10/2022 8:33 PM

The part is correct but the installation was wrong and they insist the idea of this plate stopper which covered the mounting will be oke. There are no science calculation of this stopper plate. I have contact manufacturer and not recommended to start with current installation due to safety reason. Below is the correct installation of the mounting, just for comparison.

Thank you for respond