NASA performed a large-scale pumping operation on Stennis Space Center, on Mississippi. Equipes removed around 151 million liters of water from a reservoir in just three days. The objective was to allow the replacement of a pump in the high pressure system used during rocket engine testing. The action took place between May 7 and 11, 2026. The water level reached the lowest recorded since the construction of the structure in the 1960s.
Giant Reservatório sustains rocket engine tests
The reservoir is approximately 244 meters in diameter and 7.6 meters deep. Sua total capacity reaches approximately 250 million liters. Durante tests, water protects the benches against temperatures that can reach 3,300 degrees Celsius. Ela also helps reduce the intense noise generated by burning propellants like the RS-25.
- The system provides water for flame and sound suppression.
- Water turns into vapor upon contact with extreme heat.
- Parte of the liquid returns to the system through recycling channels.
- Dez diesel engines and ten main pumps operate at the facility.
Essa infrastructure allows the pumping of more than 1.1 million liters per minute when necessary. Stennis is the main propulsion test center for Estados Unidos and serves both NASA projects and commercial companies.
Operação maintenance required detailed planning
Técnicos identified the end of life of a 3,000 gallon per minute pump. Sem isolation valve, it was necessary to lower the water level below the suction line to safely cut the pipe. Equipes rented six extra pumps and installed protections at the bottom of the reservoir to prevent erosion.
The project also included increasing the diameter of part of the piping and installing a new isolation valve. Essas improvements should facilitate future maintenance without the need to empty the reservoir again. The operation was planned in advance and did not result from any emergency.
Sistema water protects structures during testing
Engine testing generates extreme conditions. The water released in high volume cools the exhaust gases and prevents damage to the installations. In a typical RS-25 engine test, around 19 million liters of water are used. The total volume pumped in recent maintenance represents a significant fraction of the reservoir’s capacity.
Engenheiros highlight that structures like this have no equivalent in other parts of the country. The reservoir exposed during the operation revealed parts of the bottom that had remained submerged for more than 50 years. The water withdrawn was managed within the existing canal system.
Upgrade Strengthens Infrastructure for Artemis Missions
The maintenance improves a critical component for the tests that support the Artemis program. The Stennis houses benches where engines are evaluated before manned space flights. With the changes, the system gains greater reliability for future operations.
The center continues to be active in propulsion tests. Successful completion of the pump change and piping upgrades represents an important step in preserving this unique technical capability.
NASA recorded no incidents during the operation. The reservoir should gradually return to normal operating levels as the system is refilled and tested.