Pipe-in-pipe outer pipeline sealing systems and methods

A method of deploying an outer pipeline sealing mechanism, comprising:

• securing a sealing stem of the outer pipeline sealing mechanism to an inner pipe fitting that is secured to an end of an inner pipe segment in an inner pipeline to facilitate sealing an inner pipeline bore of the inner pipeline from an outer pipeline bore of an outer pipeline, wherein:
• the inner pipeline is disposed within the outer pipeline bore of the outer pipeline;
• and
• the sealing stem of the outer pipeline sealing mechanism extends out axially from a sealing plate of the outer pipeline sealing mechanism;
• securing the sealing plate of the outer pipeline sealing mechanism to an outer pipe fitting that is secured to another end of an outer pipe segment in the outer pipeline such that a seal ring is compressed between an outer fitting connector of the outer pipe fitting and the sealing plate of the outer pipeline sealing mechanism to facilitate sealing the outer pipeline bore of the outer pipeline from external environmental conditions at least in part by securing a first threaded fastener in a first fastener opening in the outer fitting connector and a second fastener opening in the sealing plate;
• and
• securing the sealing plate of the outer pipeline sealing mechanism to a source or drain pipe fitting that is secured to a source or drain pipe segment at least in part by securing a second threaded fastener in a third fastener opening in a source or drain fitting connector of the source or drain pipe fitting and a fourth fastener opening in the sealing plate of the outer pipeline sealing mechanism to facilitate fluidly connecting the inner pipeline bore of the inner pipeline to a pipe bore of the source or drain pipe segment via a pass-through bore formed through the outer pipeline sealing mechanism.

A system comprising:

• an outer pipeline, wherein the outer pipeline comprises:
• an outer pipe segment;
• and
• an outer pipe fitting configured to be secured to an end of the outer pipe segment;
• an inner pipeline configured to be disposed within an outer pipeline bore of the outer pipeline, wherein the inner pipeline comprises:
• an inner pipe segment;
• and
• an inner pipe fitting configured to be secured to another end of the inner pipe segment, wherein the inner pipe fitting in the inner pipeline comprises:
• a fitting body that defines a fitting bore;
• and
• a fitting jacket secured circumferentially around the fitting body such that the fitting jacket extends axially along the fitting body to define a tubing cavity, wherein:
• tubing of the inner pipe segment is configured to be disposed within the tubing cavity of the inner pipe fitting;
• and
• the fitting jacket is configured to be conformally deformed around the tubing of the inner pipe segment to facilitate securing the inner pipe fitting to the inner pipe segment;
• and
• an outer pipeline sealing mechanism, wherein the outer pipeline sealing mechanism comprises:
• a sealing plate configured to be secured to an outer fitting connector of the outer pipe fitting;
• a sealing stem that extends out axially from the sealing plate, wherein the sealing stem is configured to be secured to the inner pipe fitting to facilitate sealing an inner pipeline bore of the inner pipeline from the outer pipeline bore of the outer pipeline;
• and
• a seal ring configured to be compressed between the sealing plate and the outer fitting connector of the outer pipe fitting to facilitate sealing the outer pipeline bore of the outer pipeline from external environmental conditions.