Pirs – also called "Stykovochny Otsek 1" (SO-1) DC-1 (docking compartment) – is a Russian module on the International Space Station (ISS). Pirs was launched in August 2001. It provides the ISS with one docking port for Soyuz and Progress spacecraft, and allows egress and ingress for spacewalks by cosmonauts using Russian Orlan space suits.
Pirs was launched on September 14, 2001, as ISS Assembly Mission 4R, on a Russian Soyuz-U rocket, using a modified Progress spacecraft, Progress M-SO1, as an upper stage.
The Docking Compartment has two primary functions: Provide a docking port for visiting Soyuz and Progress spacecraft and serve as an airlock for Russian EVAs.
The docking port can accommodate one Soyuz-TMA or one Progress-M spacecraft. Visiting spacecraft can deliver people and cargo to and from to the space station. In addition, the Docking Compartment can transfer fuel from the fuel tanks of a docked Progress resupply vehicle to either the Zvezda Service Module Integrated Propulsion System or the Zarya Functional Cargo Block. It can also transfer propellant from Zvezda and Zarya to the propulsion system of docked vehicles—Soyuz and Progress.
The two airlocks are used for spacewalks by cosmonauts wearing Russian Orlan-M spacesuits.
Pirs was scheduled to be detached from the ISS and deorbited in 2017 by Progress MS-06, to make room for the Russian Multipurpose Laboratory Module Nauka, however due to the repetitive delays with the laboratory module, this maneuver was postponed for Progress MS-09 in 2018.
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