2012

Adaptation of a Filter Assembly to Assess Microbial Bioburden of Pressurant Within a Propulsion System

A report describes an adaptation of a filter assembly to enable it to be used to filter out microorganisms from a propulsion system. The filter assembly has previously been used for particulates >2 μm. Projects that utilize large volumes of nonmetallic materials of planetary protection concern pose a challenge to their bioburden budget, as a conservative specification value of 30 spores/cm3 is typically used.

Helium was collected utilizing an adapted filtration approach employing an existing Millipore filter assembly apparatus used by the propulsion team for particulate analysis. The filter holder on the assembly has a 47-mm diameter, and typically a 1.2-5 μm pore-size filter is used for particulate analysis making it compatible with commercially available sterilization filters (0.22 μm) that are necessary for biological sampling.

This adaptation to an existing technology provides a proof-of-concept and a demonstration of successful use in a ground equipment system. This adaptation has demonstrated that the Millipore filter assembly can be utilized to filter out microorganisms from a propulsion system, whereas in previous uses the filter assembly was utilized for particulates >2 μm.

This work was done by James N. Benardini, Robert C. Koukol, Wayne W. Schubert, Fabian Morales, and Marlin F. Klatte of Caltech for NASA’s Jet Propulsion Laboratory. NPO-48304

This Brief includes a Technical Support Package (TSP).

Adaptation of a Filter Assembly to Assess Microbial Bioburden of Pressurant Within a Propulsion System (reference NPO-48304) is currently available for download from the TSP library.

Please Login at the top of the page to download.

 

White Papers

High-Speed, Real-Time Recording Systems Handbook
Sponsored by Pentek
Unique Method for Orifice Production
Sponsored by Bird Precision
Solving the System-Level Thermal Management Challenges of LEDs
Sponsored by Mentor Graphics
Measurement of Harmonics using Spectrum Analyzers
Sponsored by Rohde and Schwarz A and D
Bridging the Armament Test Gap
Sponsored by Marvin Test Solutions
White Papers: Using FPGAs to Improve Embedded Designs
Sponsored by Sealevel

White Papers Sponsored By: