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Waste Fluid Transfer

From LM-10 Handbook (39 Mb ) pages 579-80 of 804, courtesy Ken Glover.

Apollo Operations Handbook
Lunar Module
LM 10 and Subsequent
Volume I
Subsystems Data

2.11.4.3.1 Waste Fluid Transfer

Waste fluids are transferred to small waste fluid collector assemblies by a controlled difference in pressures between the PGA and cabin (ambient).

A waste storage container in the descent stage provides urine stowage, PLSS condensate stowage, and gas separation. The size and skin thickness (and therefore the weight) of the container are minimized because the pressure caused by accumulated gases are vented to the lunar environment. Biological contamination of the lunar surface is avoided by incorporation of a germicide in the container and a bacteria filter at the vent port. An electrical heater and a pressure control valve prevent ice accumulation at the inlet and vent ports. A urine receptacle (stowed) in the cabin collects urine by direct interface with the crew.

The quick-disconnect on the urine receptacle and the overboard dump line contains a self-sealing valve. This feature enables cabin pressure to be retained when the quick-disconnect is broken. In addition, a safety pressure cap on the hose quick-disconnect provides a redundant method of preventing loss of cabin atmosphere. The hose assembly also mates with the vent and drain ports of the PLSS for water recharge. PLSS condensate is transferred to the descent stage container, using the pressure available at the PLSS to effect the transfer.


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