Fluid Filtration System
Working Fluid Filtration and Chemistry Management System
The working fluid filtration and chemistry management system uses in-line sintered 316L stainless steel filters and ion exchange beds to remove particulates and dissolved ionic contaminants from circulating working fluids. Rated at 10-micron nominal and 25-micron absolute capture with a clean pressure drop under 10 kPa, the assembly prevents pump erosion and heat exchanger clogging over a 100-year mission. The lunar radiation environment accelerates chemical fluid decomposition beyond low-Earth-orbit baselines, while surface regolith risks contaminating quick-disconnect interfaces during the robotic filter replacements required every 5 to 10 years.
In-line particulate filters and ion exchange beds maintaining working fluid purity by removing contamination and decomposition products over the 100-year mission.
Purpose
Prevent degradation of heat transfer performance and component wear caused by particulate contamination from pump wear, pipe corrosion products, and chemical decomposition. Maintain fluid purity within specification limits throughout the mission with periodic filter element replacement by robotic maintenance systems.
Context
Over 100 years of continuous circulation, working fluid accumulates contaminants from component wear, corrosion, and radiation-induced decomposition. Without filtration, particles erode pump impellers, clog heat exchanger passages, and degrade valve seat sealing. The filtration system operates continuously in-line with robotically replaceable filter elements and ion exchange cartridges.
Principles
- ▸Particulate filtration via mesh or sintered metal captures solid particles above rated micron size
- ▸Ion exchange resin beds remove dissolved ionic contaminants from working fluid
- ▸Filter differential pressure monitoring indicates loading and replacement need
- ▸Bypass flow path around filter prevents loop starvation if filter becomes fully loaded
- ▸Fluid sampling ports enable periodic chemistry analysis for contamination trending
Typical implementations
- ▸ISS ETCS in-line ammonia filter: sintered stainless steel, 10-micron rating
- ▸ISS ITCS water quality monitoring and ion exchange bed for deionized water loops
- ▸Satellite propulsion system in-line filters: sintered metal or wire mesh
- ▸Industrial process fluid filtration with automatic bypass and DP alarms
Lunar considerations
- ▸100-year mission requires multiple filter replacements; robotically-accessible cartridge design essential
- ▸Radiation-induced ammonia decomposition may accelerate contaminant generation vs LEO
- ▸Filter cartridge disposal or recycling strategy needed for long mission
- ▸Lunar dust ingress at QD interfaces during maintenance could introduce external particulates
Specifications
Functional
| primary function | Maintain working fluid purity by removing particulate and chemical contaminants |
| inputs | Working fluid from loop containing contaminants, Replacement filter cartridges from spares inventory |
| outputs | Purified working fluid returned to loop within contamination specification, Telemetry: differential pressure across filter, fluid chemistry indicators |
| particulate filtration micron | 10 micron nominal, 25 micron absolute |
| filter replacement interval years | 5-10 years per cartridge estimated |
| pressure drop clean kpa | <10 kPa at design flow rate |
Physical
| materials | Sintered stainless steel 316L (particulate filter elements), Ion exchange resin beads (ammonia-compatible formulation), Stainless steel 316L (filter housing, cartridge shell), Viton O-rings (cartridge seals) |
| operational temp range c | -40, 60 |
| internal pressure kpa | 150-500 nominal |
Operational
| power consumption w | 0 |
| thermal range c | -40, 60 |
| lifetime years | 100 |
Interfaces
Provides
- Fluid purity maintenance removing contaminants to preserve thermal properties and component life
Requires
- In-line connection to loop piping for continuous filtration
- Robotic replacement of filter cartridges and ion exchange beds
Cite this entry
Lunar Ark Codex. "Fluid Filtration System" (L3-TCS-FLOP-FILT). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-TCS-FLOP-FILT
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.