Pig Receiver Assembly

1 . A pig receiver, comprising:

a pig receiver unit;

a pig gate valve assembly disposed on the pig receiver unit, comprising:

a gate valve;

a rod, wherein the gate valve is attached to the rod at a longitudinal end of the gate valve;

a gate housing, wherein the rod is disposed within the gate housing;

a cylinder guide, wherein the cylinder guide extends longitudinally from the gate housing;

a first actuator and a second actuator; and

a contaminant removal system.

2 . The pig receiver of claim 1 , wherein the contaminant removal system comprises a manifould and fluid piping, wherein the fluid piping couples the manifould to the gate housing.

3 . The pig receiver of claim 2 , wherein the contaminant removal system comprises a lubricator, wherein the lubricator is disposed on the fluid piping.

4 . The pig receiver of claim 1 , further comprising a bottom valve and a support, wherein the bottom valve is disposed below the pig receiver unit and on the support, wherein the support is configured to support the weight of the pig receiver unit.

5 . The pig receiver of claim 1 , further comprising a sump disposed at a bottom portion of the pig receiver unit, wherein the sump comprises:

a sump valve;

a sump outlet;

a plurality of sump bars; and

a plurality of sump gaps, wherein an individual sump gap is disposed between adjacent sump bars.

6 . The pig receiver of claim 1 , further comprising a first exhaust valve and a second exhaust valve, wherein both the first exhaust valve and the second exhaust valve comprise an exhaust silencer.

7 . The pig receiver of claim 6 , wherein the first exhaust valve is disposed on the pig receiver unit between the pig gate valve assembly and a pipeline contact end of the pig receiver, wherein the second exhaust valve is disposed between the pig gate valve assembly and a pig retrieval end of the pig receiver, wherein the second exhaust valve comprises a lever.

8 . The pig receiver of claim 1 , further comprising a pressure equalization system, wherein the pressure equalization system is configured to adjust a pressure in the pig receiver unit downstream of the gate valve.

9 . The pig receiver of claim 8 , wherein the pressure equalization system comprises:

a pressure equalization valve;

an upstream connection, wherein the upstream connection is connected to the pig receiver unit upstream of the gate valve;

a downstream connection, wherein the downstream connection is connected to the pig receiver unit downstream of the gate valve;

a first pressure gauge, wherein the first pressure gauge is disposed at the upstream connection; and

a second pressure gauge, wherein the second pressure gauge is disposed at the downstream connection.

10 . The pig receiver of claim 9 , further comprising a pressure line, wherein the pressure line is coupled to the upstream connection and the downstream connection, wherein the pressure equalization valve is disposed on the pressure line.

11 . A method for operating a pig receiver, the method comprising:

closing a gate valve of the pig receiver, wherein the pig receiver comprises:

a pig receiver unit;

a pig gate valve assembly disposed on the pig receiver unit, comprising:

the gate valve;

a rod, wherein the gate valve is attached to the rod at a longitudinal end of the gate valve;

a gate housing, wherein the rod is disposed within the gate housing;

a cylinder guide, wherein the cylinder guide extends longitudinally from the gate housing;

a first actuator and a second actuator; and

a contaminant removal system;

opening a pressure equalization valve of the pig receiver;

adjusting a pressure downstream of the gate valve; and

equalizing the pressure downstream of the gate valve with a pressure upstream of the gate valve.

12 . A method for operating a pig receiver, the method comprising:

flowing a fluid to the pig receiver, wherein the pig receiver comprises:

a pig receiver unit, wherein a bottom valve is disposed below the pig receiver unit;

a sump, wherein the sump is disposed at a bottom portion of the pig receiver unit;

a pig gate valve assembly disposed on the pig receiver unit, comprising:

a gate valve;

a rod, wherein the gate valve is attached to the rod at a longitudinal end of the gate valve;

a gate housing, wherein the rod is disposed within the gate housing, wherein the gate housing comprises a gate sealing area;

a cylinder guide, wherein the cylinder guide extends longitudinally from the gate housing;

a first actuator and a second actuator; and

a contaminant removal system;

contacting a surface of the pig gate valve assembly with the fluid;

flowing the fluid to the gate sealing area; and

removing contaminants from the pig receiver unit.

13 . The method of claim 12 , wherein the fluid comprises air, gas, water, solvent, or any combination thereof.

14 . The method of claim 13 , wherein the solvent comprises ethanol, hydrogen peroxide, or any combinations thereof.

15 . The method of claim 12 , further comprising lubricating the fluid.

16 . The method of claim 12 , wherein the removing contaminants comprises allowing contaminants to fall from the pig receiver unit to a bottom portion of the sump.

17 . The method of claim 12 , wherein the removing contaminants comprises flowing the fluid longitudinally through the sump.

18 . The method of claim 12 , wherein the contaminants include solids, obstructions, viscous material, or tar-like material.

19 . The method of claim 12 , wherein the removing contaminants comprises directing the contaminants from the bottom valve to a retrieval device.

20 . The method of claim 12 , wherein the removing contaminants comprises flowing the fluid to the bottom valve to provide a force to remove the contaminants.