Method of remanufacturing fluid end block

Patent metadata

Field	Value
Publication number	US-10563494-B2
Application number	US-201715801422-A
Country	US
Kind code	B2
Filing date	Nov 2, 2017
Priority date	Nov 2, 2017
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

A method of remanufacturing a fluid end block having a plurality of segments adapted to receive working fluid includes removing at least one damaged segment from the plurality of segments of the fluid end block. The method also includes providing at least one replacement segment at a location of the at least one damaged segment. The method further includes providing a seal between a first surface of the at least one replacement segment and a first surface of at least one adjacent segment of the plurality of segments. The method includes coupling the at least one replacement segment with the at least one adjacent segment to form a remanufactured fluid end block.

First claim

What is claimed is:

1. A method of remanufacturing a fluid end block, the fluid end block including a plurality of segments adapted to receive working fluid, the method comprising:
removing at least one damaged segment from the plurality of segments of the fluid end block;
providing at least one replacement segment at a location of the at least one damaged segment;
providing a seal between a first surface of the at least one replacement segment and a first surface of at least one adjacent segment of the plurality of segments; and
coupling the at least one replacement segment with the at least one adjacent segment to form a remanufactured fluid end block;
wherein the at least one replacement segment is coupled with the at least one adjacent segment by welding;
wherein the coupling of the at least one replacement segment with the at least one adjacent segment by welding comprises:
machining the first surface of the at least one replacement segment to provide a first chamfered edge at the first surface;
machining the first surface of the at least one adjacent segment to provide a second chamfered edge at the first surface; and
providing a weld bead in a channel formed by the first and second chamfered edges.

2. The method of claim 1 further comprising machining the first surface of the at least one adjacent segment before the coupling of the at least one replacement segment with the at least one adjacent segment.

3. The method of claim 1 , wherein the at least one replacement segment includes a circular groove formed on the first surface of the at least one replacement segment, wherein the circular groove is adapted to receive the seal.

4. The method of claim 1 , wherein the seal is a metal seal.

5. A method of remanufacturing a fluid end block, the fluid end block including a plurality of segments adapted to receive working fluid, the method comprising:
removing at least one damaged segment from the plurality of segments of the fluid end block;
providing at least one replacement segment at a location of the at least one damaged segment;
providing a seal between a first surface of the at least one replacement segment and a first surface of at least one adjacent segment of the plurality of segments; and
coupling the at least one replacement segment with the at least one adjacent segment to form a remanufactured fluid end block;
wherein the at least one replacement segment is coupled with the at least one adjacent segment by stich pins;
wherein the coupling of the at least one replacement segment with the at least one adjacent segment by the stitch pins comprises:
providing a plurality of apertures at a contact portion of the at least one replacement segment and the at least one adjacent segment for receiving the stitch pins;
installing the stitch pins in the plurality of apertures; and
machining an excess material of the stitch pins projecting outwards from an outer surface of the remanufactured fluid end block.

Assignees

• Caterpillar Inc

Inventors

• Graham Curtis J
• Kinney Christopher A

Classifications

• B23P6/04 Primary

  Repairing fractures or cracked metal parts or products, e.g. castings · CPC title

• E21B43/267 Primary

  reinforcing fractures by propping · CPC title

• F04B47/04

  the driving means incorporating fluid means · CPC title

• F04B47/02

  the driving mechanisms being situated at ground level (F04B47/12 takes precedence) · CPC title

• F04B7/04

  in which the valving is performed by pistons and cylinders coacting to open and close intake or outlet ports · CPC title