ASTM G86-2017 pdf free download

ASTM G86-2017 pdf free download.Standard Test Method for Determining Ignition Sensitivity of Materials to Mechanical Impact in Ambient Liquid Oxygen and Pressurized Liquid and Gaseous Oxygen Environments
1. Scope
1.1 This test method 2 describes test equipment and tech- niques to determine the impact sensitivity of materials in oxygen under two different conditions: (1) in ambient pressure liquid oxygen (LOX) or (2) under pressure-controlled condi- tions in LOX or gaseous oxygen (GOX). It is applicable to materials for use in LOX or GOX systems at pressures from ambient to 68.9 MPa (0 to 10 000 psig). The test method described herein addresses testing with pure oxygen environ- ments; however, other oxygen-enriched fluids may be substi- tuted throughout this document. 1.2 This test method provides a means for ranking nonme- tallic materials as defined in Guide G63 for use in liquid and gaseous oxygen systems and may not be directly applicable to the determination of the sensitivity of the materials in an end-use configuration. This test method may be used to provide batch-to batch acceptance data. This test method may provide a means for evaluating metallic materials in oxygen-enriched atmospheres also; however, Guide G94 should be consulted for preferred testing methods. 1.3 Values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability of regulatory limitations prior to use. See also Section 9. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 energy threshold, n—the highest impact energy level at a given pressure for which the passing criteria have been met. 3.1.2 GOX, n—gaseous oxygen. 3.1.3 LOX, n—liquid oxygen. 3.1.4 mechanical impact, n—a blow delivered by a plummet that has been dropped from a pre-established height onto a striker pin in contact with a sample. 3.1.5 reaction, n—a chemical change or transformation in the sample initiated by a mechanical impact. 3.1.5.1 Discussion—A reaction from ambient pressure, LOX mechanical impact may be determined by an audible report, an electronically or visually detected flash, obvious charring of the sample, sample cup assembly, or striker pin. 3.1.5.2 Discussion—Reactions in pressurized LOX or GOX are typically indicated by an abrupt increase in test sample temperature, chamber pressure, and light levels and may be supplemented by obvious changes in odor, color, or material appearance as a result of thermal decompositions observed during examination after the test. 3.1.6 pressure threshold, n—the highest pressure at a given impact energy level for which the passing criteria have been met.
4. Summary of Test Method
4.1 The mechanical impact test system is designed to expose material samples to mechanical impact in the presence of liquid or gaseous oxygen at pressures from ambient to 68.9 MPa (0 to 10 000 psig). The basic test system configuration consists of: an electromagnet, a plummet, plummet guide tracks, plummet hold/release mechanism, base plate, anvil plate, a sample cup assembly holder, sample cup assembly, and striker pin (see Fig. 1). For tests conducted under pressure- controlled conditions, the anvil plate and sample cup assembly holder are replaced with a test chamber equipped with a striker pin or striker pin counterloader (see Fig. 2), test chamber purge, pressurization and vent systems (see Fig. 3), and a plummet catcher (see Fig. 4). The general procedure is to prepare the test sample and record significant pretest data.