Safety requirements related to the end-user equipment

This LAP is concerned with the safety requirements (and design and operational aspects) for commercial and domestic end-user equipment operating with hydrogen gas blends resulting from hydrogen injected and transmitted in the gas grid at the TSO level


The requirements needed to guarantee the safety of the end user application.
Is it a barrier?
Assessment Severity


Question 1 Is there any legislation with regard to safety requirements related to end-user equipment (e.g.: limits in terms of H2 for use in gas appliances)? If yes, please answer the following question.
The limitation of H2 quantity (0,1%). The safety requirements determinated by equipment manufacturer must be taken into account. Overall safety rulling about activities with flamable gases apply. An electrical installation, electrical facility, and electrical device in an object and territory in which an explosive environment may occur shall be in an explosion-proof construction in conformity with the zoning of an explosive environment. It is prohibited to operate a technological facility in an explosive and fire-hazardous object and to perform technological process, if the ventilation system has been damaged or is not operating; In an object where leakage of combustible gases is possible, measures shall be taken in order to prevent forming of explosive concentration. In an object where a gas apparatus is located the total nominal heat capacity of which is more than 50 kW, as well as if a gas apparatus (regardless of the capacity of the gas apparatus) is located in a basement or mezzanine floor, a detector signalling gas leakage shall be installed. The detector signalling gas leakage shall be maintained in working order. Cylinders with combustible gases or substances or oxidising gases and substances (except cylinders which have been attached to engineering networks or work equipment) shall be stored outside the object in metal cabinets with ventilation openings along fireproof external walls of the structure of the object without windows or not less than 6 m from structures. It shall be permitted to store a reserve of cylinders in rooms of health care institutions, but not more than 12 litres of oxidising gases, if such gases are intended for human life support facilities. Cylinders with combustible gases and substances or cylinders with oxidising gases and substances shall be stored in the territory in containers. The maximum permissible summary capacity of gas cylinders in a container may not exceed 2000 litres. The risk caused by explosive atmospheres shall be assessed not less frequently than once a year, as well as when a new workplace has been created or changes have been made in any of the existing workplaces (for example, there are changes in work processes, methods, work equipment, utilisation of substances and products and production thereof) that might increase the risk caused by an explosive atmosphere and affect the safety and health of employees at work.
Question 2 Changes to gas supply composition may have implications for the design of gas appliances (safety) and the relevant legislation. What are the implications you expect with regard to the possible concentrations of hydrogen in the H2NG blend?
By increasing the allowed quantity of H2, safety rulling must be determinated.