How to measure the levelness of a vertical pump
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Several small vertical centrifugal pumps were installed on site, with the motors directly connected to the pumps. How can the levelness of such pumps be measured? The specifications require: 0.05 mm/m in the longitudinal direction and 0.10 mm/m in the transverse direction.
Let’s see if there are any flanges that can be used It’s to check the levelness of the flange, and then install the bracket.
There are two locations that can be used: one is the contact surface between the pump and the motor, and the other is the inlet and outlet flanges of the pump.
The flange surface where the pump is connected to the motor can be used as a reference for alignment. However, in the case of vertical pumps, the vertical and horizontal levels differ very little, so we treat them as equal during alignment. The values you mentioned seem to refer to the level requirements for horizontal pumps!
I’m not sure if your specifications are correct; we usually just measure the inlet and outlet flanges of the pump. Within two.
The standard mentioned by the poster is the one set by the Ministry of Chemical Industry in 1983; this standard is widely used in the petrochemical industry. In my opinion, the levelness has not much impact on the operation of pumps. If it’s to satisfy the supervisor, one can discuss with them to determine the most appropriate location, and then settle on a universally accepted position. But hey, it’s still necessary to pay attention to the flanges at the inlet and outlet – otherwise stress will be generated in the piping, and that’s a fundamental issue.
1. Alignment of inlet and outlet flanges, 2. Flanges connecting the motor and the pump, 3. Base frame; for single-stage pumps, a looser fit is acceptable
For submersible pumps, measurements can be taken on the base, while for other pumps, the inlet and outlet flanges of the pump can be used to determine levelness.