heavy vibration in sulphur pit vent blower structure

Question

heavy vibration in sulphur pit vent blower structure

2om (Petroleum)

(OP)

30 Jan 16 18:06

Dear All,
we have a sulphur pit vent blower in one of our unit, and there is very high vibration on structure. the inlet and outlet piping carries sulphur and is steam traced. the rotating engineer is saying that the machine is ok,and vibration on his equipment is with in limit.
however , the vibration on the structure is scary and one can really feel it. And , one guide support was found broken near to the equipment.there are expansion bellows at inlet and outlet nozzles. the piping seems to be highly restrained. looking for advices ,
thanks in advance.

Tmoose (Mechanical) · Answer 1 · 2016-01-30 23:58:34

Much more information about the measured vibration amplitude and frequency is needed for a variety of locations on the pit blower and piping.

Has the "rotating engineer" created a report of the measurements he has made, and what the "limits" are, and where the limits came from?

ronfrend (Industrial) · Answer 2 · 2016-03-10 12:52:02

Sounds like you have a resonance problem. Typical problems with sulphur pumps is plate out onto the rotating element and the piping - particularly if the temperature drops at all. I imagine what has happened is that you have plate out (sulphur solidification) in the pipework and that has increased the mass so moving the natural frequency to near the run speed frequency of the pump or maybe even vane pass if running off BEP. I suggest you stop the pump for a minute or two and carry out a quick bump test on the affected pipework and structure to find out if you are seeing a natural frequency near pump speed.

Ron Frend
http://www.predicon.net

Tmoose (Mechanical) · Answer 3 · 2016-03-10 15:30:53

Hi Ron,
You understandably suggested "to find out if you are seeing a natural frequency near pump speed."
I don't think we know what the predominant vibration frequency(s) are yet.
Or anything else useful, really.

It also Looks like OP has not been back since the original post.

Oh well.

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heavy vibration in sulphur pit vent blower structure