Dual rod assembly and collar installation method

An assembly for coupling pipe segments, comprising:

• a collar including a through-passage extending longitudinally from a first end to a second end, each end having an interior surface configured to engage with a pipe segment including a torque-transmitting feature, wherein the torque-transmitting feature comprises a polygonal profile;
• and
• an intermediate section located between the first and second ends and having a larger internal diameter than the through-passage;
• a ring configured to fit within the intermediate section, wherein:
• the ring is positionable to engage with the through-passage in a first position and disengage in a second position;
• and
• a connector configured to secure a pipe segment within the collar, wherein the connector interacts with the ring to maintain its position within the intermediate section;
• and
• wherein the collar, ring, and connector are collectively configured to enable torque transmission between coupled pipe segments.

An assembly comprising:

• a retainer, wherein:
• in a first orientation, the retainer presents a first profile with a first maximum width;
• and
• in a second orientation, the retainer presents a second profile with a second maximum width, wherein the first maximum width is less than the second maximum width;
• a collar having a primary passage and an intermediate section, wherein the intermediate section interrupts the primary passage and wherein the primary passage has an inner diameter larger than the first maximum width but less than the second maximum width;
• and
• a bolt, connectable to a first pipe section while the retainer is within the intermediate section of the collar in the second orientation, such that the bolt maintains the retainer in the second orientation.