Economical High Pressure Wear Resistant Cylinder That Utilizes A High Pressure Field For Strength

Abstract

A high-pressure wear resistant cylinder that utilizes a high-pressure field for strength is an economical method of, or device for, handling very high pressures and the pumping of abrasive and corrosive fluids. The economic considerations are so favorable, that the invention may be considered a replacement part. The invention is suitable for a variety of applications, particularly a reciprocating flow work exchanger in the well stimulation or hydraulic fracturing industry. Using a high pressure field to strengthen the external surface (outside) of a pipe that is precision honed and plated or sleeved internally (inside), it is now possible to construct various high pressure machines in a relatively inexpensive manner. This invention makes it possible to use pipe with internal operating pressures greater than their nominal operating pressure ratings permit. This invention will be used in various high pressure piping and machinery applications.

I claim: 
     
         1 . An apparatus for pumping fluid comprising:
 an inner cylinder defining an interior cavity and an exterior surface,   an outer cylinder, encompassing the inner cylinder, having an interior surface and an exterior surface,   the interior surface of the outer cylinder being in communication with the exterior surface of the inner cylinder,   a means for sealing one end of the inner and outer cylinders,   an end assembly fixed attached to the opposed end of the inner and outer cylinders for moving fluid into and out of the interior cavity of the inner cylinder,   wherein the outer cylinder has a higher pressure rating than the inner cylinder, and provides greater structural integrity to the inner cylinder, and   a piston located within the inner cylinder cavity for moving the fluid contained in the inner cavity.   
     
     
         2 . The apparatus of  claim 1  wherein the interior surface of the outer cylinder is spaced apart from the exterior surface of the inner cylinder, and a pressure field is created between the exterior of the inner cylinder and the interior of the outer cylinder wherein pressurized fluid is added to increase the pressure capability of the inner cylinder. 
     
     
         3 . The apparatus of  claim 2  wherein the pressure field is charged through ports contained in the inner cylinder. 
     
     
         4 . The apparatus of  claim 2  wherein the pressure field contains a plurality of dividers creating a plurality of smaller pressure fields. 
     
     
         5 . The apparatus of  claim 2  wherein the pressure field is charged through ports contained in the outer cylinder. 
     
     
         6 . The apparatus of  claim 1  wherein interior surface of the outer cylinder is in direct contact with the exterior surface of the inner cylinder thereby providing greater structural integrity to the inner cylinder. 
     
     
         7 . An apparatus for pumping abrasive fluid comprising:
 an inner cylinder defining an interior cavity and a specified pressure rating,   an outer cylinder defining an interior cavity and a second specified pressure rating which is greater than the pressure rating of the inner cylinder,   a piston contained within the inner cylinder cavity for moving the fluid contained in the inner cavity, and   wherein, the inner cylinder is fitted within the inner cavity of the outer cylinder, creating a pressure field between the exterior of the inner cylinder and the interior of the outer cylinder wherein pressurized fluid is added to increase the pressure capability of the inner cylinder   
     
     
         8 . An apparatus for pumping fluid comprising:
 an inner cylinder defining an interior cavity, an exterior surface, and a specified pressure rating,   an outer cylinder, encompassing the inner cylinder, having an interior surface, an exterior surface, and a second specified pressure rating which is greater than the pressure rating of the inner cylinder,   a piston located within the inner cylinder cavity for moving the fluid contained in the inner cavity,   the interior surface of the outer cylinder is spaced apart from the exterior surface of the inner cylinder, and a pressure field is created between the exterior of the inner cylinder and the interior of the outer cylinder wherein pressurized fluid is added to increase the pressure capability of the inner cylinder.   a means for sealing one end of the inner and outer cylinders,   an end assembly fixed to the opposed end of the inner and outer cylinders for moving fluid into and out of the interior cavity of the inner cylinder, and   wherein the outer cylinder, having a higher-pressure rating than the inner cylinder, provides greater structural integrity to the inner cylinder.