There are numerous models that can be used to assess the consequence and risk of leaks and releases.
One such model is HYRAM which is publicly available from Sandia and the US DOE.
Category: Hazards Analysis
Keywords: Leak, Simulation Models, HYRAM, Risk Assessment
Emergency response procedures must be developed for each system based on its design. The
procedures generally include steps to clear personnel from the immediate area, isolate the hydrogen,
shut down the equipment, contact local responders, and protect surrounding equipment/structures until
the hazard is mitigated or the incident is over.
Category: Hazards Analysis
Keywords: Emergency Response
There are several levels of documents which can be used to assist with the design, sizing, selection, and installation of the pressure relief device settings for LH2 tanks.
Pressure vessel design codes, such as the ASME Boiler and Pressure Vessel Code will provide minimum requirements for design of pressure vessels (including LH2 tanks), relief devices, and relief systems. However…
Category: Pressure Relief Devices
Keywords: Boiling Liquid Expanding Vapor Explosion (BLEVE), LH2, Fire, NFPA 2, Storage, Pressure Relief Device
CGA G-5.5 states: All vent stacks shall be grounded and meet the requirements of NFPA 70, National Electrical Code, for integrity and system design and also references NFPA 77, Recommended Practice on Static Electricity, and NFPA 780, Standard for the Installation of Lightning Protection Systems.
For lightening refer to NFPA 780 and for grounding of the Hydrogen equipment, refer to…
Category: Hazards Analysis
Keywords: Vent Stack, Requirements, Grounding, NFPA
AICHE ELA253 CHS ” Introduction to Hydrogen Safety for First Responders” is a good reference and discusses both LH2 and GH2. LH2 fires are very unusual. LH2 releases usually are GH2 so the fires at either ambient for low flow or the GH2 is a cryo temperature for high flow. Fires from LH2 tanks ignite less frequently than GH2 high-velocity releases. The colder the gas the less potential for…
Category: Hazards Analysis
Keywords: First Responders, Safety, LH2, GH2, Guidelines, Fire Protection
Safety codes globally have a requirement to provide a positive means to isolate energy sources and hazardous substances prior to performing maintenance. For gaseous hydrogen systems, methods such as a blind flange, a double block valve arrangement or a double block and bleed valve arrangement can provide that positive isolation.
Installing a blind flange requires breaking the supply line…
Category: Pressure Relief Devices
Keywords: Valves, Codes
