Cover for fluid systems and related methods

1. A high-pressure, high power, reciprocating positive displacement fluid pumping system, the system comprising:

a high-pressure, high power, reciprocating positive displacement pump comprising a pump plunger;

a fluid end block assembly including a fluid end block body, a suction port, a discharge port, a pump bore positioned in and extending through the fluid end block body, and a fluid chamber positioned in the fluid end block body and in fluid communication with each of the suction port, the discharge port, and the pump bore, the fluid chamber having an open end portion extending to an opening of the fluid end block body, the open end portion having an inner cylindrical wall and an interior chamfered surface positioned between the inner cylindrical wall and the opening, and the pump plunger being movably positioned in the pump bore to pressurize one or more fluids in the fluid chamber;

a fluid cover including:

a monolithic body having a longitudinal axis and including:

a first end,

a second end opposite the first end along the longitudinal axis,

a first portion having an outer cylindrical surface that extends axially from the first end, the outer cylindrical surface having a first outer diameter and including an annular groove, and

a second portion extending axially from the first portion to the second end, the second portion having a second outer diameter greater than the first outer diameter and including:

a threaded portion mechanically connected to the fluid end block body, and

a flange portion positioned axially between the threaded portion and the annular groove;

at least one first seal member positioned on the outer cylindrical surface of the first portion such that the outer cylindrical surface is spaced away from the inner cylindrical wall of the open end portion by the at least one first seal member and such that the at least one first seal member sealingly is engaged with the inner cylindrical wall; and

a second seal member at least partially received in the annular groove such that the second seal member is compressed against the interior chamfered surface.

2. The fluid pumping system of claim 1 , wherein the at least one first seal member is positioned between the flange portion and the first end of the monolithic body.

3. The fluid pumping system of claim 1 , wherein the fluid open end portion has a threaded interior surface positioned between the opening and the chamfered interior surface, wherein the threaded portion engages the threaded interior surface to secure the fluid cover to the fluid end block assembly, and wherein the second end of the monolithic body has a tool engagement feature to engage with a securing tool when positioned to secure the fluid cover.

4. The fluid pumping system of claim 1 , wherein the second seal member and the annular groove are configured such that a portion of the second seal member extends radially outward beyond the first outer diameter of the first portion to provide a fluid-resistant seal against the interior chamfered surface of the fluid end block body.

5. A fluid cover for being sealably engaged with a fluid end block assembly of a high-pressure, high power, reciprocating positive displacement fluid pumping system, the fluid cover comprising:

a monolithic body having a longitudinal axis and including:

a first end,

a second end opposite the first end along the longitudinal axis,

a first portion having an outer cylindrical surface extending axially from the first end, the outer cylindrical surface having a first outer diameter, the outer cylindrical surface configured to be received in an interior portion of an open end portion of a fluid chamber of the fluid end block assembly, the open end portion extending to an opening of the fluid end block assembly and having an interior chamfered surface positioned between the interior portion and the opening, and the outer cylindrical surface having an annular groove;

a second portion extending axially from the first portion to the second end, the second portion having a second diameter greater than the first diameter and including:

a threaded portion for being mechanically connected to the fluid end block assembly, and

a flange portion between the threaded portion and the annular groove of the first portion;

at least one first seal member positioned on the outer cylindrical surface of the first portion such that the at least one first seal member sealingly is engaged with the interior portion; and

a second seal member at least partially received in the annular groove such that the second seal member is configured to engage with the interior chamfered surface of the open end portion.

6. The fluid cover of claim 5 , wherein the at least one first seal member is positioned between the flange portion and the first end.

7. The fluid cover of claim 5 , wherein the second seal member and the annular groove are configured such that a portion of the second seal member extends radially outward beyond the first outer diameter of the first portion to provide a fluid-resistant seal against an interior chamfered surface of the fluid end block assembly.

8. The fluid cover of claim 5 , wherein the threaded portion is configured to engage with a threaded interior surface of the fluid end block assembly that is positioned between the interior chamfered surface and the opening to secure the fluid cover in the fluid end block assembly, and wherein the second end of the monolithic body includes a tool engagement feature configured to be engaged by a securing tool when positioned to secure the fluid cover.

9. A method of operating a high-pressure, high power, reciprocating positive displacement fluid pumping system, the method comprising:

obtaining a fluid end block assembly including a fluid end block body, a suction port, a discharge port, a pump bore positioned in and extending through the fluid end block body, and a fluid chamber positioned in the fluid end block body and in fluid communication with each of the suction port, the discharge port, and the pump bore, the fluid chamber having an open end portion that extends to an opening of the fluid end block body, the open end portion having an inner cylindrical wall and an interior chamfered surface such that the interior chamfered surface is positioned between the inner cylindrical wall and the opening;

obtaining a high-pressure, high power, reciprocating positive displacement pump comprising a pump plunger;

fluidly connecting the pump to the fluid end block assembly;

inserting a fluid cover at least partially into the open end portion so as to align the fluid cover with the fluid end block body, the fluid cover including:

a monolithic body having a longitudinal axis and including:

a first portion and a second portion, the first portion having an outer cylindrical surface that extends from an end of the monolithic body toward the second portion, the outer cylindrical surface having a first outer diameter and an annular groove,

the second portion having a second outer diameter greater than the first outer diameter, the second portion including:

an end surface of the fluid cover, the end surface including a tool engagement feature for engaging the tool engagement feature with a tool to secure the fluid cover to the fluid end block body,

a threaded portion, and

a flange portion between the threaded portion and the annular groove, and

at least one first seal member arranged on the outer cylindrical surface of the first portion,

a second seal member at least partially received in the annular groove;

sealingly engaging the at least one first seal member with the inner cylindrical wall such that the outer cylindrical surface is spaced away from the inner cylindrical wall by the at least one first seal member;

sealingly engaging the second seal member with the interior chamfered surface;

mechanically connecting the threaded portion to the fluid end block body; and

operating the pump, the operating the pump comprising moving the pump plunger in the pump bore to pressurize one or more fluids in the fluid chamber.

10. The method of operating the fluid pumping system of claim 9 , wherein inserting the fluid cover includes engaging the at least one first seal member with the inner cylindrical wall to align the fluid cover with the open end portion.

11. The method of operating the fluid pumping system of claim 9 , further comprising providing a fluid-resistant seal against the interior chamfered surface of the fluid end block body with the second seal member.

12. The method of operating the fluid pumping system of claim 9 , wherein the fluid end block body has a threaded interior surface positioned between the interior chamfered surface and the opening, and wherein the mechanically engaging comprising engaging the threaded portion of the fluid cover with the threaded interior surface to secure the fluid cover in the fluid end block body.

13. The method of claim 9 , wherein the end of the monolithic body is positioned within the open end portion, and wherein sealingly engaging the at least one first seal member with the inner cylindrical wall includes sealingly engaging the at least one first seal member with the inner cylindrical wall such that the outer cylindrical surface is spaced away from the inner cylindrical wall at the end of the monolithic body by the at least one first seal member.