What are the consequences of operating a pump under load without performing secondary grouting?
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What consequences will arise if a load test is carried out directly after the primary grouting of the pump is completed and shims are installed, without carrying out secondary grouting?
Displacement may occur; in severe cases, the machine and pump will be destroyed
Vibrations are likely to occur, and in severe cases the base may shift. I’ve seen many units that haven’t been properly grouted experience significant vibration, so it’s easy to imagine what happens when no grouting is used.
I’m curious about the real reason you asked this question? Has it happened or are you just curious?
Vibration generation is necessary. The reason is that the shim set shifted, disrupting the secondary leveling condition during installation. It’s not the base that is shifting; the base comes with anchor bolts specified, so how could it shift! The main function of secondary grouting is to prevent the shim set (which has been spot-welded together) from shifting, with a secondary function being to provide a finishing layer.
Here’s the situation: the client wants a trial run before the New Year, but it’s extremely cold, with temperatures dropping below minus 20 degrees, making it impossible to carry out secondary grouting. The client requires the shims to be welded to the equipment in order for it to operate. We know this doesn’t comply with the standards, but the owner keeps insisting on it, so we want to know what will happen once it’s in operation. In particular, the motor of the induced draft fan at 560 kV.
Should it be an indoor setup or an outdoor one? If it’s an indoor setup, then install a few heaters to warm up the space and maintain a higher indoor temperature. We encountered the same problem with grouting back then; we then installed several high-power air conditioners to keep heating day and night.
It is recommended not to do this, as we have encountered similar problems: negligence in carrying out the secondary grouting led to excessive vibration of the equipment, frequent overheating of its seals, and worst of all, it became difficult to find a new location for repairs.
You definitely can’t do this; the most immediate consequence will be excessive vibration while driving