KSC-KTI-5210 REV C
MATERIAL SELECTION LIST FOR OXYGEN SERVICES
|Publication Date:||7 March 2012|
This document is intended as a resource for materials selection for design of oxygen systems for KSC ground support equipment (GSE) and ground support systems (GSS). Flammability and combustion data extracted from NASA, ASTM, and industry documents for materials commonly used in KSC oxygen systems are summarized in Table 1 (Nonmetallic [Soft Good] Materials) and Table 2 (Metals), in order to facilitate selection of materials for oxygen service. Autogenous Ignition Temperature, Heat of Combustion, and Oxygen Index data are presented for nonmetallic materials; Promoted Ignition (NASA-STD-6001B, Test 17) data are presented for metallic materials. Codes are assigned to each material per KTI-5209, Material Usage Code.
The nonmetallic materials listed in Table 1 were also tested per NASA-STD-6001B supplemental tests for mechanical impact in ambient pressure LO2 (Test 13A) and variable pressure GO2 and LO2 (Test 13B). The materials listed in Table 1 are rated A2 for mechanical impact up to the operating pressures listed in the table. Mechanical impact is only considered a credible ignition mechanism in certain components; mechanical impact test results can be utilized as an aid to the OCA process when mechanical impact is identified as a credible ignition mechanism. Batch/lot testing for mechanical impact is no longer required for all soft goods used in oxygen service in the 1,650 - 6,700 psi range. NASA Design Engineering or NASA M&P may still require mechanical impact testing for operating pressures higher than the pressures at which the materials are rated A, in cases where mechanical impact is a credible ignition mechanism. In these cases the mechanical impact testing requirement will be stated on the drawing.
The vendors and applicable specifications for the materials listed in this KTI have been updated from the previous revision. These listings do not take into account the effects of unknown formulation and/or process changes that could be performed by a manufacturer, which could result in a material performing differently than these test results would indicate. Materials requiring initial testing, revalidation testing, or mechanical impact testing in accordance with NASA-STD- 6001B may be submitted to the KSC Materials Science Laboratory.
2 Meets the measurements/test condition requirements of NASA-STD-(I)-6001B Appendix A.5, Mechanical Impact for Materials in Ambient Pressure LOX (Test 13A) and Mechanical Impact for Materials in Variable Pressure GOX and LOX (Test 13B), and does not require batch testing; number of tests = 20 and the number of reactions = 0 (zero), or number of tests = 60 and the number of reactions = 1 (one). Standard impact energy is 72 ft-lb, but may vary. Consult MAPTIS for actual test conditions.