Tests of the Contamination Analysis Unit, Phase 2

Meltzer, Michael ; Daley, Paul

Lawrence Livermore National Laboratory

关键词: Desorption;    Gas Chromatography;    Rockets;    Gaskets;    Substrates;   

DOI  :  10.2172/15005876
RP-ID  :  UCRL-CR-151434-REV-1
RP-ID  :  W-7405-ENG-48
RP-ID  :  15005876

美国|英语

来源: UNT Digital Library

【 摘 要 】

Lawrence Livermore National Laboratory (LLNL) has developed a mass spectrometer-based system that measures organic surface residues in situ. This system, called the Contamination Analysis Unit (CAU), can detect and quantify a variety of volatile surface residues on a range of different substrates. Residue samples are removed from the substrate using a combination of vacuum and thermal desorption, and are then ionized and quantified by a quadrupole mass spectrometer. The current effort (Phase 2) was carried out in accordance with Thiokol Project Test Plan PTP-0467. A first phase of tests was completed under PTP-0327 and the results reported in TWR-75385. The Phase 2 test plan, PTP-0467, is a follow-on to PTP-0327, and was conducted in order to more fully determine the capabilities of the CAU. This report summarizes experiments in which the CAU was evaluated for application in reusable solid rocket motor production scenarios. The report has been ordered by the tasks requested by ATK Thiokol Propulsion Testplan PTP-0467. Project tasks included the following: (1) Determine the amount of residual propellant and liner components with the CAU after coupons have been cleaned. (2) Determine if the CAU can detect solvent that has soaked into NBR. (3) Test the capabilities of the CAU for analyzing non-flat surfaces on the inside and outside of the 12-foot diameter Reusable Solid Rocket Motor (RSRM) and 5-foot diameter nozzle throat housing surfaces. (4) Determine if solvent extraction and gas chromatography (GC) approaches are able to enhance the surface analysis data available through use of the mass-spectrometer-based CAU. (5) Determine the CAU's detection limit for various soils and cleaners. (6) Determine if contact of both Viton and silicon O-rings with critical substrates will result in any visual evidence of the contact, when observed under black light. (7) Demonstrate CAU viability during routine manufacturing Thiokol manufacturing operations. This effort was originally projected to include three one-week visits to Utah in 2000 to analyze surfaces during routine FSM-9 manufacturing and three additional one-week visits to Utah in 2001 during FSM-10 PSA manufacture. These two tasks were compressed into one that was conducted at Thiokol during 2000.