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byrdj , they plan to just edge weld the thick shim as shown the attached picture. What do you think drill holes and have welds on the inside is better solution??

Tmoose , the thick shim(6 mm) will be welded to the mounting base and then plan is to perform alignment by putting shims on top this welded pad as needed. My question is acceptable solution for soft foot elimination??

kingnero vendor wants to weld pads on the mounting base, after welding the pads his plan is to perform alignment by shims

Guys, During leveling adjustment of one motor we found difficulty to obtain acceptable motor’s soft foot(less than 0.05mm)we are getting 0.2mm soft foot due to in flat base support. The contractor/Vendor recommended Welding of pads(5-6mm thickness) to base for soft foot correction(see attached...

Guys, We have new machine(reciprocating compressor 04 vertical cylinders), we have checked piston rod run outs and found values ranging from 0.18mm to 0.3mm. Vendor does not have any problem with this value but these values looks high to me.I was searching in API 618 , not found enough...

Guys/Artisi , the equipment is leveled and aligned , but my concern is more no of shims ? Is it going to create any problem like vibrations in future? What If in future motor replacement if we have to raise the motor for alignment? Usually the best practice is use atleast one thick shim(1/8...

Guys, Still waiting for response on this

Tmoose, The thickness of each shim is around 1mm , for alignment it requires to stack up to 9mm so he put 09 no.s of equal no of shims My concern is no of shims more than 05. Just want to know can we accept this alignment with more than 5 shims? OR what can we ask vendor regarding acceptable...

Guys, We have new machine motor 8 MW motor ,for motor to gearbox alignment the vendor has put shims around 8 to 9 shims ubder motor feet which is more than API recommended 5 shims. We recommend vendor to arrange thick shims so as to reduce the no. Of shims upto 5. But vendor rejected our...

Guys, We have new machine(reciprocating compressor 04 vertical cylinders), we have checked piston rod run outs and found values ranging from 0.18mm to 0.3mm. Vendor does not have any problem with this value but these values looks high to me.I was searching in API 618 , not found enough...

Electricpete, Quote: For a given set of endpoints, rapid change in speed is better than slow change in speed with respect to exciting a torsional resonance (it's better to pass thru a resonance fast than slow… if endpoints are resonant than either case is equally bad) Mean by endpoints is...

Johnny Pellin , The coupling is diaphragm or disk pack coupling Flender (N EUPEX).

Electricpete It is diaphragm coupling Flender N EUPEX .http://files.engineering.com/getfile.aspx?folder=79ef8570-35d9-4563-a615-16a9f1a2420a&file=Coupling_Drawing_Flender_EUPEX.jpg

Johnny , Please help me with questions that need to be asked to OEM to make sure that we will be in safe position as far as coupling failure due torsional resonance is concerned. Apart from torsional analysis ,what are data /documents that can be asked to OEM that confirm that there will be no...

Guys, We have VSD motor driven Lobe type blower.Due to nature of process, this blower can see large and quick swings in the speed output. Its also a fairly large motor(1000 HP) and being a lobe type there’s quite some mass on the coupling end.Does these quick speed changes creates any risk for...

Thanks johnny for valuable inputs, One more query Can you give any idea on how much degree in taper shim can be allowed so that it cannot slipped off in running condition? My concern here is to ensure that the taper shim should not be act like a wedge.

Johnny , What is the danger in using taper shim for long term? How it will effect the machine reliability?

Guys, We have observed taperness in a motor feet (due to poor machining) which is causing soft foot.Someone has suggested to make taper shims and put under motor feet to keep them in one leve. Is it recommended to put tapered shim under motor feet to align it with pump.If taper shimming is...

Johnny, After achieving the pipe alignment within specification ,when inserting and torquing the bolts do we still need to put some kind of dial indicator on the crank shaft to see the shaft deflection due to pipe strain?

Guys , Just found that API 686 ,recommends as below for pipe strain measurement for reciprocating compressor Clause 4.8 Pipe Strain Measurement 4.8.7 Reciprocating compressor piston rod run out shall be measured before and after connection of process gas piping to the compressor cylinders...