cityjack
Mechanical
- Mar 5, 2013
- 50
Afternoon everyone,
I have been tasked with revamping our old and outdated resin conveying system from the rail cars to the extruder.
2 separate systems in parallel. We currently use a vacuum pump to suck the pellets from the rail car through a cyclone for filtering from the rail car to hoppers above an airlock valve. The exhaust (yes its hot) from the vacuum pump is put into a pressure tank which in turn is used to push the pellets from the airlock at the bottom of the hopper up to the tops of the silos. From the bottoms of the silos, its sucked intro the building into two more separate hoppers and then sucked by additional vacuum pumps through aluminum piping to the mixing hoppers and onto the extruder for film creation.
Right now, the only way I can control flow from the rail cars is by introducing more or less air at the rail car adapters. Adjustable air gates if you will. The speed at which the pellets move (CFM) is totally dependent on the motors that drive the vacuum pumps. They are NOT VFD. My only source of speed control is via different size pulleys on the motor to pumps. Until I can get a plan together for a complete system, I need to make the best of what I have.
I have made the pumps vacuum equal. My rail car adapters are equal in design and aperture. My aluminum tubing to the hoppers and air locks outside are equal in diameter and length. I need to try to eliminate or cut down on the angel hair. I need to be able to monitor cfm to see how I affect flow with changes I make to the motors or piping or whatever. Any suggestions on what I can use for flow monitoring? Any good suppliers for angel hair elimination piping? What is a typical cfm rate for LDPE, anyone have a good starting point?
Thank you all and have a nice weekend./
Sid
I have been tasked with revamping our old and outdated resin conveying system from the rail cars to the extruder.
2 separate systems in parallel. We currently use a vacuum pump to suck the pellets from the rail car through a cyclone for filtering from the rail car to hoppers above an airlock valve. The exhaust (yes its hot) from the vacuum pump is put into a pressure tank which in turn is used to push the pellets from the airlock at the bottom of the hopper up to the tops of the silos. From the bottoms of the silos, its sucked intro the building into two more separate hoppers and then sucked by additional vacuum pumps through aluminum piping to the mixing hoppers and onto the extruder for film creation.
Right now, the only way I can control flow from the rail cars is by introducing more or less air at the rail car adapters. Adjustable air gates if you will. The speed at which the pellets move (CFM) is totally dependent on the motors that drive the vacuum pumps. They are NOT VFD. My only source of speed control is via different size pulleys on the motor to pumps. Until I can get a plan together for a complete system, I need to make the best of what I have.
I have made the pumps vacuum equal. My rail car adapters are equal in design and aperture. My aluminum tubing to the hoppers and air locks outside are equal in diameter and length. I need to try to eliminate or cut down on the angel hair. I need to be able to monitor cfm to see how I affect flow with changes I make to the motors or piping or whatever. Any suggestions on what I can use for flow monitoring? Any good suppliers for angel hair elimination piping? What is a typical cfm rate for LDPE, anyone have a good starting point?
Thank you all and have a nice weekend./
Sid