A process for pigging between a first body rotatively coupled to a second body of a system, comprising:
- inserting a pig into a first fluid conduit, wherein the system comprises:
- an inline swivel comprising a fixed part and a rotating part, wherein the fixed part of the inline swivel is configured to be connected to the second body and the rotating part of the inline swivel is configured to be connected to the first body;
- a toroidal swivel comprising a fixed part and a rotating part, wherein the fixed part of the toroidal swivel is configured to be connected to the second body and the rotating part of the toroidal swivel is configured to be connected to the first body;
- a first fluid conduit configured to be in fluid communication with a fluid supply conduit disposed on the first body and the rotating part of the inline swivel, wherein the first fluid conduit comprises a first launch valve located between the fluid supply conduit and the rotating part of the inline swivel;
- a second fluid conduit in fluid communication with the first fluid conduit and the rotating part of the toroidal swivel, wherein the second fluid conduit is in fluid communication with the first fluid conduit at a location located between the fluid supply conduit and the first launch valve, and wherein the second fluid conduit comprises a second launch valve located between the first fluid conduit and the rotating part of the toroidal swivel;
- a third fluid conduit in fluid communication with the first fluid conduit and configured to be in fluid communication with a first fluid return conduit disposed on the first body, wherein the third fluid conduit is in fluid communication with the first fluid conduit at a location located between the first launch valve and the rotating part of the inline swivel, and wherein the third fluid conduit comprises a first return valve located between the first fluid conduit and the first fluid return conduit;
- a fourth fluid conduit in fluid communication with the rotating part of the toroidal swivel and the third fluid conduit, wherein the fourth fluid conduit is in fluid communication with the third fluid conduit at a location located between the first fluid return conduit and the first return valve, and wherein the fourth fluid conduit comprises a second return valve located between the rotating part of the toroidal swivel and the first fluid return conduit;
- a fifth fluid conduit in fluid communication with the fixed part of the inline swivel and configured to be in fluid communication with a fluid discharge conduit disposed on the second body, wherein the fifth fluid conduit comprises a third launch valve located between the fixed part of the inline swivel and the fluid discharge conduit;
- a sixth fluid conduit in fluid communication with the fixed part of the toroidal swivel and the fifth fluid conduit, wherein the sixth fluid conduit is in fluid communication with the fifth fluid conduit at a location located between the fluid discharge conduit and the third launch valve, and wherein the sixth fluid conduit comprises a fourth launch valve located between the fixed part of the toroidal swivel and the fluid discharge conduit;
- a seventh fluid conduit in fluid communication with the fifth fluid conduit and configured to be in fluid communication with a second fluid return conduit disposed on the second body, wherein the seventh fluid conduit is in fluid communication with the fifth fluid conduit at a location located between the third launch valve and the fixed part of the inline swivel, and wherein the seventh fluid conduit comprises a third return valve located between the fifth fluid conduit and the second fluid return conduit;
- and
- an eighth fluid conduit in fluid communication with the fixed part of the toroidal swivel and the seventh fluid conduit, wherein the eighth fluid conduit is in fluid communication with the seventh fluid conduit at a location located between the second fluid return conduit and the third return valve, and wherein the eighth fluid conduit comprises a fourth return valve located between the fixed part of the toroidal swivel and the second fluid return conduit;
- placing the system into a launch mode;
- flowing a fluid from the fluid supply line to displace the pig from the first fluid conduit toward the inline swivel;
- flowing the fluid until the pig has passed the third launch valve;
- placing the system into a receive mode;
- and
- flowing the fluid until the pig has entered the third fluid conduit.