Old Hydraulic Gear Pump

[oldnslo]

Stan,
I would suspect that your cylinder is fine. If this is a welded cylinder Vs Tie rod style. Tie rod style has 4 rods with threaded ends that are used to hold the end caps onto the barrel. If welded style a possible way to guesstimate wall thickness is to look in one of the ports unless they welded onto the end caps? If welded onto the barrel you should be able to see the bottom of the fitting / ID of the barrel and measure that distance from the top of the fitting. Subtract the fitting extension height above the OD and this should provide a idea on the wall thickness. Once the wall thickness is known you could figure the cylinder bore.

Yes you have the system operation nailed down on how or when it would build pressure.

Roy the oldnslo one

 

[NJ Toolnut]

Stan,
I would suspect that your cylinder is fine. If this is a welded cylinder Vs Tie rod style. Tie rod style has 4 rods with threaded ends that are used to hold the end caps onto the barrel. If welded style a possible way to guesstimate wall thickness is to look in one of the ports unless they welded onto the end caps? If welded onto the barrel you should be able to see the bottom of the fitting / ID of the barrel and measure that distance from the top of the fitting. Subtract the fitting extension height above the OD and this should provide a idea on the wall thickness. Once the wall thickness is known you could figure the cylinder bore.

Yes you have the system operation nailed down on how or when it would build pressure.

Roy the oldnslo one

Thanks Roy, great idea!

Cylinder is the welded type, not tie rod style. End cap opposite ram end is welded to end of barrel. End cap with ram appears to screw in to barrel since a regular pattern of holes has been drilled around the circumference of the end cap edge, apparently for use of a pin spanner. The visible portion of this end cap is 1/2" thick. Ports are in line on barrel wall, with each port located an inch or two from its respective end cap. Ports stick 15/16" straight out from barrel wall. I stuck a straight piece of stiff wire with a short end bent at a right angle into one of the ports, hooked the bent end on the bore wall, measured the length of the straight portion of the wire after marking it with a fine point Sharpie where it met the outer edge of the port, and got 1 5/16". By difference, the wall thickness is about 3/8". This thickness means the bore diameter must be about 3 3/4" for a tonnage (at 2500 psi) of 14 tons. A look into the port with a bright flashlight revealed nice shiny surfaces.

Stan

 

[oldnslo]

Stan,
As a point of reference, 4" schedule 80 pipe has a wall thickness of .337 (about 11/32) and is pressure rated to 1900 PSI with 4:1 safety factor. I would not be to concerned about running that cylinder at 2500 PSI especially since splitters rarely will see any huge pressure spikes.

 

[NJ Toolnut]

Stan,
As a point of reference, 4" schedule 80 pipe has a wall thickness of .337 (about 11/32) and is pressure rated to 1900 PSI with 4:1 safety factor. I would not be to concerned about running that cylinder at 2500 PSI especially since splitters rarely will see any huge pressure spikes.

Thanks!

I'm going to use it, but due to its short length I think I will seek a way to design the splitter to be able to easily replace it with a 24" cylinder with a 4" bore in the future.

Stan