CSA HGV 4.9:2016 pdf download.Hydrogen fueling stations
1.1 CSA HGV 4.9 specifies the design, installation, operation and maintenance of site- built and modular gaseous hydrogen fueling stations (HFS) for light duty vehicles, where light duty vehicles are defined by the Environmental Protection Agency as passenger cars and light trucks, minivans, passenger vans,pickup trucks, and sport-utility vehicles, also referred to as the "common ategory" which includes class 1, 2, 3 vehicles up to 14,000 lbs. The requirements are based upon United States and international codes and standards, but, where appropriate, local and federal codes and standards may supersede the requirements listed in this Standard.
1.4 This Standard contains SI (Metric) units with corresponding yard/ pound quantities, the purpose being to allow the standard to be used in SI (Metric) units. 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 valve in other units are both specified as a quoted marking requirement, the first stated unit, or both are to be
provided.
Note: IEEE/ASTM SI 10 or IsO 80000-1 was used as a guide in making metric conversions to yard/pound quantities.
4.4.3 Delivered hydrogen
Hydrogen delivered to the station shall meet the specifications listed in CGA G5.3 or equivalent standard such that it is compliant with Clause 4.4.1. The hydrogen provider should provide the documentation confirming compliance to this requirement.
4.4.4 Continuous monitoring
Stations that have on-site generation or purification of hydrogen shall have a method of continuously monitoring the system(s) to verify that the hydrogen quality meets the requirements of Clause 4.4.1. If the continuous monitoring system does determine there is a risk of contamination, the system shall prevent dispensing until the station operator can determine the source of the problem and confirm the hydrogen gas will meet the requirements of Clause 4.4.1.
One method of continuously monitoring is by using a sensor to monitor one or more canary species on the output gas stream of the generator or purifier. Another method is monitoring the process parameters of the generator or purifier.
4.5.1 General
Filters and separators shall be included throughout the HFS to minimize the effect on critical valve control surfaces by particulate contamination in the hydrogen fluid stream and meet the requirements of Clause 4.4.1.
The filters and separators shall be designed to provide maximum gas flow to support compressor or dispenser manufacturer's requirements, and should be provided with sufficiently large sumps or collection systems to contain the expected impurities in the hydrogen.CSA HGV 4.9 pdf download.