Modular plunger packing gland assembly

1 . A modular plunger packing gland assembly for a plunger of a frac pump, comprising:

an annular packing nut configured to be disposed circumferentially about the plunger and proximate a plurality of annular seals disposed about the plunger; and

an annular packing gland having an inner circumferential threaded interface configured to engage an external circumferential thread defined on a head of the packing nut, the annular packing gland further defining a plurality of openings configured to receive a plurality of threaded bolts configured to securely fasten the annular packing gland and the packing nut to the frac pump,

wherein the inner circumferential threaded interface is disposed around a portion of the packing nut having the largest outer diameter of the packing nut;

wherein the packing nut is disposed entirely within the annular packing gland.

2 . The modular plunger packing gland assembly of claim 1 , wherein the plurality of openings in the annular packing gland are distributed about a fluid bore opening of the frac pump in an offset manner.

3 . The modular plunger packing gland assembly of claim 1 , wherein the annular packing gland further defines a threaded pin opening configured to receive a threaded locking pin configured to exert force on an outer circumferential surface of the packing nut when the locking pin is fully inserted.

4 . The modular plunger packing gland assembly of claim 1 , further comprising an elongated sleeve configured for enveloping the plunger and maintained in position within a fluid bore of the frac pump by the annular packing gland.

5 . The modular plunger packing gland assembly of claim 1 , further comprising an elongated sleeve coupled to and integrated with the annular packing gland and configured for enveloping the plurality of annular seals within a fluid bore of the frac pump.

6 . The modular plunger packing gland assembly of claim 5 , wherein the annular packing gland further defines a lubrication port and a lubrication path.

7 . The modular plunger packing gland assembly of claim 1 , wherein an outer circumference of the annular packing gland further defines a groove to accommodate a sealing lubrication.

8 . A packing gland assembly for a plunger bore of a hydraulic fracturing pump, comprising:

a packing nut; and

a packing gland that is configured to be bolted onto a fluid end of the hydraulic fracturing pump, the packing gland including:

a sleeve that fits within the plunger bore and holds a packing within an internal passage of the sleeve;

an inner circumferential threaded interface outside an end of the sleeve and configured to engage an external thread defined on the packing nut; and

a plurality of openings configured to receive respective bolts configured to bolt on the packing gland to the fluid end,

wherein the packing nut is configured to be threaded to the inner circumferential threaded interface of the packing gland to engage the packing with an end portion of the packing nut that is inserted within the internal passage of the sleeve;

wherein the inner circumferential threaded interface is disposed around a portion of the packing nut having the largest outer diameter of the packing nut;

wherein the packing nut is disposed entirely within the packing gland.

9 . The packing gland assembly of claim 8 , wherein a groove for sealing lubrication is defined in an outer circumferential surface of the end portion of the packing nut.

10 . The packing gland assembly of claim 8 , wherein a groove for sealing lubrication is defined in an outer circumferential surface of the sleeve.

11 . The packing gland assembly of claim 8 , wherein the plurality of openings are distributed about the plunger bore in an offset pattern.

12 . The packing gland assembly of claim 8 , wherein the plurality of openings and the respective bolts are threaded.

13 . The packing gland assembly of claim 8 , further comprising a locking pin to be inserted through a pin opening defined in the packing gland and to exert force on the packing nut to prevent rotational movement between the packing nut and the packing gland.