CSA HPIT-1:2015 pdf download.Compressed hydrogen powered industrial truck on-board fuel storage and handling components
1.9 CSA HPIT-1 contains SI (Metric) units corresponding to the yard/ pound quantities, the purpose being to allow the standard to be used in SI (Metric) units. IEEE/ASTM SI 10 or ISO 80000-1 is used as a guide in making metric conversion from yard/pound quantities. If a value for a measurement and a corresponding value in other units are stated, the first stated value is to be regarded as the requirement. The given corresponding value may be approximate. If a value for a measurement and a corresponding value in other units are both specified as a quoted marking requirement, the first stated unit, or both are to be provided.
4.1 Alternative design and construction
These requirements are not intended to prevent the design and construction of components not specifically prescribed in this Standard, provided that such alternative has been considered in testing and listing the components. In considering alternative designs or construction, the materials or methods used shall be evaluated as to their ability to yield equivalent or better performance and reasonable concepts of safety to that prescribed by this Standard.
4.2 Construction specifications
All specifications as to construction set forth herein shall be satisfied by the construction actually prescribed or such construction as will provide at least equivalent performance. Additional tests may be required to evaluate potential failure modes that pertain to the new construction or materials that are not specifically addressed in this Standard.
4.5.3 Non-metallic materials normally in contact with hydrogen shall be determined to be acceptable in hydrogen service. Consideration shall be given to the fact that hydrogen diffuses through these materials much easier than through metals; therefore, the suitability of materials shall be verified.
Non-metallic materials shall retain their mechanical stability with respect to strength (fatigue properties, endurance limit, creep strength) when exposed to the full range of service conditions and lifetime, as specified by the manufacturer. Materials shall be sufficiently resistant to the chemical and physical action of the fluids that they contain and to environmental degradation. The chemical and physical properties necessary for operational safety shall not be significantly affected within the scheduled lifetime of the equipment unless replacement is foreseen; specifically, when selecting materials and manufacturing methods, due account shall be taken of the material's corrosion and wear resistance, electrical conductivity, impact strength, aging resistance, the effects of temperature variations, the effects arising when materials are put together (for example, galvanic corrosion), the effects of ultraviolet radiation, and to the degradation effects of hydrogen on the mechanical performance of a material.CSA HPIT-1 pdf download.