BS ISO 21010:2017 pdf download

BS ISO 21010:2017 pdf download.Cryogenic vessels — Gas/material compatibility
1 Scope
This document specifies gas/material compatibility requirements (such as chemical resistance) for cryogenic vessels, but it does not cover mechanical properties (e.g. for low-temperature applications).
This document provides general guidance for compatibility with gases and detailed compatibility requirements for oxygen and oxygen-enriched atmospheres. This document also defines the testing methods for establishing oxygen compatibility of materials (metallic and non-metallic) to be used for cryogenic vessels and associated equipment.
This document focuses on materials that are normally with or could be in contact with cryogenic fluids.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 10297:2014, Gas cylinders — Cylinder valves — Specification and type testing
ISO 23208, Cryogenic vessels — Cleanliness for cryogenic service
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Compatibility of materials with gases other than oxygen
Cryogenic vessels are used in a range of temperatures from very low temperature to ambient temperature. On excluding oxygen, compatibility problems such as corrosion normally occur at ambient temperature and become negligible at cryogenic temperatures.
In the case of gases other than oxygen, ISO 11114-1 and ISO 11114-2 can be used as a guide for cryogenic vessels.
5 General requirements for oxygen service
5.1 Evaluation of materials for oxygen service
5.1.1 General
The selection of a material for use with oxygen and/or in an oxygen-enriched atmosphere is primarily a matter of understanding the circumstances that cause oxygen to react with the material. Most materials in contact with oxygen will not ignite without a source of ignition energy. When an energy input rate,as converted to heat, is greater than the rate of heat dissipation, and the resulting heat increase is continued for sufficient time, ignition and combustion will occur. Thus, two things shall be considered:
— the material’s minimum ignition temperature;
— the energy sources that will produce a sufficient increase in the temperature of the material.
These should be viewed in the context of the entire system design so that the specific factors listed below will assume proper relative significance.
The specific factors are:
— the properties of the materials, including the factors affecting ease of ignition and the conditions affecting potential resultant damage (heat of reaction);
— the operating conditions: pressure, temperature, gas velocity, oxygen concentrations, and oxygen state (gaseous or liquid) and surface contamination in accordance with ISO 23208;