CSA HPIT 2:2017 pdf download.Dispensing systems and components for fueling hydrogen powered industrial trucks
4.1 General safety strategy
The manufacturer shall perform a risk assessment verifying in a written form that:
a) all reasonably foreseeable hazards, hazardous situations, and events throughout the anticipated HPIT dispensing equipment's lifetime have been identified;
b) the risk for each of the hazards in Clause 4.1 a) has been estimated from the combination of probability of occurrence of the hazard and of its foreseeable severity; and
c) the two factors that determine each one of the estimated risks (probability and severity) in Clause 4.1 a) and b) have been eliminated or reduced as far as practical through inherently safe design and construction methods. Further risk reduction shall be established according to the following sequence:
i) ensuring hazards are contained within the equipment enclosure;
ii) passive control of energy releases without endangering the surrounding environment (for example, burst disks, relief valves, thermal cut-off devices, etc.);
iii) actively control such forms of energy (for example, by electronic control equipment included in the HPIT dispensing system, which enforces adequate countermeasures based on the evaluation of sensor signals). Guidance for safety critical components can be found in UL 991,UL 1998, or IEC 61508; and
iv) for residual risks that could not have been reduced by the measures according to i), ii), and iii),the provision of labels, warnings, or the requirement of special training shall be taken,considering that such measures need to be understood by the persons who are in the area of the hazard.
4.5.6 Corrosion, abrasion, and erosion Where conditions of erosion, abrasion, corrosion, or other chemical reactions may take place, adequate measures shall be taken to:
a) minimize that effect by appropriate design (for example, additional thicknes), or by appropriate protection (for example, use of liners, cladding materials, or surface coatings), taking into account the intended and reasonably foreseeable use;
b) permit replacement of parts that are most affected; and
c) draw attention to the instructions referred to in Clause 6.6.1 to the type and frequency of inspection and maintenance measures necessary for continued safe use. Where appropriate, it ;shall be indicated which parts are subject to wear and the criteria for replacement.
Note: Historically, corrosion, abrasion, and erosion issues have arisen with the use of copper and copper alloys in this environment. A way to identify compatibility is by testing the material in accordance with ASTM B858, using a pH value of 10.0. This test would be conducted on un-plated samples.CSA HPIT 2 pdf download.