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mounting plate leveling/slope

mounting plate leveling/slope

mounting plate leveling/slope

Dear All,

Mounting plate : On which the machine base frame sits
Base plate : equipment base frame

I need one info regarding the mounting plate leveling/sloping.
The configuration is motor coupled with gearbox coupled with reciprocating simplex diaphragm pump.
The motor and pump are overhung while gearbox is resting on mounting plate.

The mounting plate is sloped and to correct the slopness of mounting plate they added shim on 2 front foots of gearbox foundation.
Gearbox baseplate is all horizontal (No seperate 4 legs but whole base frame rests on the mounting frame).
As they have added shim approx 30 percent of the area of gearbox baseplate is not resting on the mounting plate and there is a gap visible.

My query is

1. Commissioning is taking place and here we have the chance to level the mounting plate which requires a substantial amount of work. If there any guideline for the leveling of the mounting plate.
2. Are shims being allowed under the gearbox as it doesnot need to be aligned with the pump and the motor.
3. Is there a spec that this much amount of area base plate area should be resting on mounting plate.

RE: mounting plate leveling/slope

Looks like a gearbox frame supports end mounted motor, pump and something else I don't recognize.
But what's even more interesting is what's below the gearbox surprise.
I think you got more problems than slope.
I'd like to hear what u/Tmoose thinks about that machine support!

(2B)+(2B)' ?

RE: mounting plate leveling/slope

What does it matter if the mounting plate is not level provided it is flat to allow unrestrained mounting of the pump /gearbox base to the mounting plate, what is important is the pipe work alignment to the pump connecting flanges.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

RE: mounting plate leveling/slope

Base leveling could be the least of your problems, unless you need to eliminate this from future consideration. The steel support structure is suspect for resonant vibrations. If vibrations are low and natural frequencies are not close to excitation frequencies, then consider that good fortune. In addition to a baseline vibration survey, you could consider a structural impact-response test, or simply wait for future issues.


RE: mounting plate leveling/slope

Thanks for inviting me to this thread EPete.

As the honorable W. Strong so graciously (under) stated, "If vibrations are low ....... consider that good fortune. "

Vikas86 has not been back since May 31.
If the unit is driven by a VFD that may be because he has been busy struggling to get thru acceptance testing.

I hope he returns and posts some good shots of that installation front, side, high and low angle shots from pump to floor.
The general arrangement drawing (with those black stripes over the eyes of the participants) is often useful as well.
I am very interested in the details of the plate that the lone rectangular tubing pedestal is welded to. Plate thickness, any reinforcing on the under side, whatever is holding the plate in the air, and so on.

At first I thought there might legs at the four corners of the plate made of channel, but then I decided the one visible vertical channel continues past the plate with tall drip edge, and may not be supporting the pump etc at all. Like maybe even the assembly is perched atop a l-o-n-g tall pedestal not in the picture [surprise].

RE: mounting plate leveling/slope

I apologize not to keep up to date on this thread as had to go to other installations.
In the meantime, I have not accepted this installation.
I would get some pictures tomorrow & will post.

In the mean time its not a VFD. Its a metering pump , simplex diaphragm pump.
Tmoose you r right, at the bottom its a drip pan , the sole plate is supported on the Ibeam (not visible in the picture)

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