Piston Rod buckling
Piston Rod buckling
(OP)
Guys,
How the piston rod is calculated in terms of buckling ? Is there any special way to calculate this since this is a horizontal laout or the piston rod is supported on ie. packing case?
Maybe some of you know any reliable source just for referrence. (I am not talking about the Mechanical Handbook or sth. like that)
Appreciate your help
Tahnks
Bart
How the piston rod is calculated in terms of buckling ? Is there any special way to calculate this since this is a horizontal laout or the piston rod is supported on ie. packing case?
Maybe some of you know any reliable source just for referrence. (I am not talking about the Mechanical Handbook or sth. like that)
Appreciate your help
Tahnks
Bart





RE: Piston Rod buckling
When the cylinder reverses, the inside has 90 in^2 times 100 psi or 9000 pounds force and the other end has 30 psi times 100 in^2 or 3000 pounds net 600 pounds force.
Each compressor has a specified limit of the maximum forces. The number are typically 11000 pounds of force per 1 inch^2 area of the rod for a major industrial compressor. Some smaller air compressors may only allow 5000 pounds per inch^2.
Another way to buckle or break a rod is to allow liquids into the cylinder. The liquids cannot pass out of the check valve quickly enound and the piston trys to compress them and the unstopple force meets the unmoveable wall and something gives, the rod.
RE: Piston Rod buckling
I just wanted to know if there is a "special" methodology of calculating the buckling or I can just simply use the common equations.
RE: Piston Rod buckling
RE: Piston Rod buckling
Its a modification of the Euler equation that's used here,
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may be too much,
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Piston Rod buckling
RE: Piston Rod buckling
from a quick internet search using "shigley euler buckling"
RE: Piston Rod buckling
I've also seen the distance piece shear all the way through on a wet gas recovery compressor on an unusually cold day. Visualize the cylinder and attached pulsation bottles and piping heaving back and forth at 327 rpm. It was a single throw machine with large spoke-type flywheel. All the flywheel spokes sheared at the hub.
Operators swore it wasn't liquid ingestion. Yeah, right.
Small independent refineries scare me.
Best regards,
Tom McGuinness, PE
Turbosystems Engineering
www.turbosynthesis.com
RE: Piston Rod buckling
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