Our production +7 (473) 236-76-94 394052, Voronezh st., Ostrogozhskaya 109 V krioservis@mail.ru Hydrogen TECHNICAL REQUIREMENTS Technical gaseous hydrogen must be produced in accordance with the requirements of GOST 3022-80 "Technical hydrogen. Technical conditions." according to technological regulations approved in the prescribed manner. The requirements of GOST 3022-80 apply to technical hydrogen obtained from a nitrogen-hydrogen mixture and water electrolysis, and used in the chemical, petrochemical, metallurgical, pharmaceutical, electronic and other industries. Formula H 2 . Molecular weight (according to international atomic masses 1985) - 2.016. Depending on the purpose, technical hydrogen is produced in compressed and uncompressed form of two grades: A - used in the electronic, pharmaceutical, chemical industries, in powder metallurgy: for the deposition of refractory compounds from metal oxides; when sintering products made of powder materials containing chromium and stainless steels; B - used in electronic, chemical, non-ferrous metallurgy, pharmaceutical industry, communications industry and energy. In terms of physical and chemical characteristics, technical hydrogen must comply with the following standards: Indicator name Norm for the brand A B 1. Volume fraction of hydrogen in terms of dry gas,%, not less 99.99 99.95 2. The total volume fraction of oxygen and nitrogen, no more 0.01 0.05 3. Mass concentration of water vapor at 20 ° C and 101.3 kPa (760 mm Hg), g / m3, not more: a) in pipelines b) in cylinders under pressure 0.5 0.2 0.5 0.2 Note. Indicator 3a) is determined by the manufacturer at the time of pumping technical hydrogen into the pipeline. SAFETY REQUIREMENTS Hydrogen is a colorless, odorless combustible gas. The density of hydrogen under normal conditions is 0.09 kg / m3; air density - 0.07 kg / m3; heat of combustion - 28670 kcal / kg; the minimum ignition energy is 0.017 mJ. Forms an explosive mixture with air and oxygen. A mixture with chlorine (1: 1) explodes in the light; hydrogen combines with fluorine with an explosion in the dark; mixture with oxygen (2: 1) - detonating gas. Explosive limits: with air 4 - 75 vol. %, with oxygen 4.1 - 96 vol. %. Explosive mixtures of hydrogen with air belong to category II C, group T1 according to GOST 12.1.011-78. The autoignition temperature of hydrogen is 510 ° C. Hydrogen is physiologically inert; causes suffocation at high concentrations. The narcotic effect is manifested at high pressures. When working in a hydrogen environment, you must use an insulating gas mask (oxygen or hose). Operation of cylinders filled with gaseous hydrogen, as well as recipient containers with hydrogen, must be carried out in accordance with the rules for the design and safe operation of pressure vessels approved by the Gosgortekhnadzor of the Russian Federation. RULES OF ACCEPTANCE Technical hydrogen is accepted in batches. A batch is considered to be any quantity of a product that is uniform in terms of quality and drawn up in one document on quality, but not more than a shift production; during pipeline transportation - any amount of hydrogen delivered to the consumer within 24 hours. Each batch of technical hydrogen must be accompanied by a document certifying the quality of the product. The document must contain: company name or trademark; product name, brand; batch number; date of manufacture; volume of gaseous hydrogen in m3; analysis results or confirmation of product compliance with the requirements of GOST 3022-80; designation GOST 3022-80. The consumer at least once every 24 hours receives from the supplier a document certifying the quality of hydrogen transported through the pipeline and its compliance with the requirements of GOST 3022-80. To check the quality of technical hydrogen transported in cylinders, 2% of cylinders are taken, but not less than three. To check the quality of technical hydrogen transported through the pipeline, a sample is taken at least once every 24 hours. The manufacturer, if there are automatic controls for the finished product, is allowed to carry out a control check of hydrogen for compliance with the technical requirements of GOST 3022-80 once every 24 hours. If unsatisfactory results of the analysis are obtained for at least one indicator, a repeated analysis is carried out on it on a doubled sample. The reanalysis results are applied to the entire batch. PACKING, LABELING, TRANSPORTATION AND STORAGE Steel cylinders with a capacity of 40 and 50 dm3 in accordance with GOST 949-73 are filled with technical hydrogen under pressure (14.7 + 0.5) MPa [(150 + 5) kgf / cm2] or seamless steel cylinders of large volume according to GOST 9731-79 under pressure (24.5 + 1.0) MPa [(250 + 10) kgf / cm2] at 20 ° C. Technical hydrogen is also transported by pipeline. The pressure of hydrogen transported through the pipeline must be agreed between the manufacturer and the consumer. The gas pressure in the cylinder and in the pipeline is measured with a pressure gauge in accordance with GOST 2405-88 of class not lower than 2.5. The cylinders must be returned by the consumer with a residual hydrogen pressure of at least 0.05 MPa (0.5 kgf / cm2). Cylinders and gas tanks, their coloring, operation, marking and storage must comply with the rules for the design and safe operation of pressure vessels approved by the USSR State Technical Supervision Service. Coloring of pipelines - in accordance with GOST 14202-69. Transport marking in accordance with GOST 14192-77 with the application of the manipulation sign "Afraid of heating" on the marking label, as well as hazard signs in accordance with GOST 19433-88, hazard class 2, subclass-2.3, category-2.3.1, classification code - 2311, UN code - 1049. Cylinders filled with hydrogen are transported by all types of transport, except aviation, in accordance with the rules for the carriage of dangerous goods in force for the transport of the corresponding type, and the rules for the design and safe operation of pressure vessels approved by the Gosgortechnadzor of the Russian Federation. Transportation in packaged form in special containers is allowed. Joint transportation of cylinders with hydrogen and oxygen is not allowed. Cylinders in special containers are transported by road. On railways, hydrogen in cylinders is transported in covered wagons. Transportation of cylinders should be carried out in a horizontal position with gaskets between cylinders or in a vertical position, always with a guard against a possible fall. Cylinders filled with hydrogen are stored in special warehouses or in open areas under a canopy that protects the cylinders from atmospheric precipitation and direct sunlight. Warehouse storage of hydrogen cylinders and cylinders with other gases is allowed only in rooms isolated from each other. If the oxygen content in hydrogen deviates from the standard (upward), the gas holders are immediately emptied according to the instructions approved in the prescribed manner. MANUFACTURER 'S GUARANTEES The manufacturer must guarantee that technical hydrogen meets the requirements of GOST-3022-80 subject to the conditions of transportation and storage. The guaranteed shelf life of the product in cylinders is 3 years, in rubber-fabric gas tanks - 24 hours from the date of manufacture. Copyright © "Krioservice" 2008 All rights reserved