REG NASA-LLIS-0260-1993 Lessons Learned - Stainless Steel Tubing Residue.pdf

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1、Lessons Learned Entry: 0260Lesson Info:a71 Lesson Number: 0260a71 Lesson Date: 1993-09-03a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Stainless Steel Tubing Residue Description of Driving Event: Possible residue build-up in stainless steel tubing, as obtained from the supplie

2、r, could cause a blockage in the line. All stainless steel tubing should be inspected for cleanliness prior to use and should be cleaned according to the following procedure for general R&D applications:1. Blow down with dry air to remove majority of particles.2. Pass solvent-rinsed, lint-free swab

3、through tubing to dislodge additional particles.3. Flush tubing with fresh solvent for about 15 seconds. Follow with another dry air blow down.4. Conduct cursory, visual examination of each cleaned tube to assure that all visible particles are removed.5. Install tight-fitting, clean, plastic caps on

4、 each tubing end.6. Fasten tag on each tubing section to identify that a cleaning process has been accomplished.Note: This procedure will not provide adequate cleanliness for sensitive pneumatic/hydraulic applications, oxidizing propellant service, or flight hardware applications.Lesson(s) Learned:

5、Stainless steel tubing, as obtained from the supplier, can contain a residue build-up that could cause a blockage in the line.Recommendation(s): Inspect and, if necessary, clean all stainless steel tubing before installation in a plumbing system.Evidence of Recurrence Control Effectiveness: Provided

6、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Flight Equipmenta71 Ground Equipmenta71 Industrial Operationsa71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1994-06-15a71 Approval Name: Maria Havenhilla71 Approval Organization: LERC/EBASa71 Approval Phone Number: 216-977-1483Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-