Howeirdhughs
09-12-2008, 06:40 PM
Hello fellow misfits, this is my first post and I must say: "it is a pleasure to find a forum like this", since there are so few of us in the world.
Here is my question/mystery: I have a room with 3 Mycom screws 1) 75 Hp, 1)160 Hp, and 1) 300Hp. This time of year we have minimal load so the 75 Hp runs almost exclusively. during the times it hits 100 percent load on the slide I get some vibration on the package that transmits through the piping as physical vibration to the other 2 units through the pipe rack. The motor bearings feel smooth and the screw compressor is quiet yet the discharge piping vibrates at the end of the package. I also see what looks like a pressure pulsation on the oil pump discharge line, but all is quiet at the pump. The oil pressure on the McCormack control panel is digital so it is steady.
It appears that this has been a problem for a long time. I have been at this plant a little over a year now and I already had to replace the discharge check valve on the 75 Hp unit. The old one had shaken itself to death internally. What sucked is that it the body was welded in place to the unit. So the 75 Hp in now quiet, but the discharge check on the 160 Hp rattles when the 160 is shut down. The way I see it is that the spring pressure inside the valve should seat it during shutdown so I am assuming that it is also worn out. It is a STAL brand valve with nomenclature DN80 stamped on the body.
Questions: What could cause this vibration?
and does anyone know if I can get internal parts for a STAL valve and where?
Much love to the world, Howie
Here is my question/mystery: I have a room with 3 Mycom screws 1) 75 Hp, 1)160 Hp, and 1) 300Hp. This time of year we have minimal load so the 75 Hp runs almost exclusively. during the times it hits 100 percent load on the slide I get some vibration on the package that transmits through the piping as physical vibration to the other 2 units through the pipe rack. The motor bearings feel smooth and the screw compressor is quiet yet the discharge piping vibrates at the end of the package. I also see what looks like a pressure pulsation on the oil pump discharge line, but all is quiet at the pump. The oil pressure on the McCormack control panel is digital so it is steady.
It appears that this has been a problem for a long time. I have been at this plant a little over a year now and I already had to replace the discharge check valve on the 75 Hp unit. The old one had shaken itself to death internally. What sucked is that it the body was welded in place to the unit. So the 75 Hp in now quiet, but the discharge check on the 160 Hp rattles when the 160 is shut down. The way I see it is that the spring pressure inside the valve should seat it during shutdown so I am assuming that it is also worn out. It is a STAL brand valve with nomenclature DN80 stamped on the body.
Questions: What could cause this vibration?
and does anyone know if I can get internal parts for a STAL valve and where?
Much love to the world, Howie