Laboratory Gas Tap

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This training course is presented with the understanding that the information and materials provided were developed based on specific circumstances present at the Los Alamos National Laboratory at the time of publication. Those circumstances may or may not be similar to conditions present at other locations represented by participants in this course. The course materials and information will need to be adapted accordingly. The University of California/Los Alamos National Laboratory will not be liable for direct or indirect damages resulting from use of this material.

Because of its small molecular size, hydrogen can easily pass through porous materials and is capable of being absorbed by some containment materials, which can result in loss of ductility or embrittlement. At elevated temperatures, this process is accelerated. Because of the possibility of hydrogen embrittlement of some materials, piping and component materials that are not subject to this form of degradation should be selected. Recommended materials include 300-series stainless steels, copper, and brass.

even been used as a filler for oxygen sources for underwater diving. The primary health effect associated with hydrogen is the possibility that it could displace air in a poorly ventilated or confined space, resulting in asphyxiation. However, because it is flammable at only 4% in air, the most significant concern should be the physical hazard of flammability and the possibility of burns resulting from fires and explosions. When working with liquid hydrogen, there is an additional health hazard of cryogenic burns.

Pressure-relief devices are also necessary on all volumes where liquid hydrogen or cold hydrogen gas can be trapped, and on vacuum insulation spaces surrounding liquid hydrogen. It is important that the discharge of pressure-relief devices is vented outdoors in a way that avoids impingement of escaping gas on adjacent equipment, structures, or personnel. Vents shall not discharge where hydrogen can accumulate, such as below eaves of buildings.

Because of the extremely low energy required to ignite flammable mixtures of hydrogen gas, you must exercise caution when using hydrogen around electrical equipment. All flexible hoses and piping systems must be electrically grounded. The National Fire Protection Association has established standards for the specifications of electrical equipment intended to be used around hydrogen gas. The Occupational Safety and Health Administration has also
established specifications for electrical equipment used around indoor hydrogen gas systems with a gas volume capacity greater than feet. Contact your area safety engineer for assistance in ensuring that these standards are followed.

Once the regulator is attached, be sure that the regulator adjusting screw is in the closed position before opening the cylinder valve. When opening the valve, turn the hand wheel slowly so that the hydrogen does not enter the regulator suddenly. Never use a wrench, hammer, or other tool to open or close the hand wheel. When opening the cylinder valve to extract content, turn the hand wheel all the way open and then back toward the closed position one quarter turn. When the work is finished, turn the cylinder valve off and be sure to bleed off all remaining hydrogen from the regulator before removing it from th cylinder.

which was never completed, used large amounts of hydrogen as the rocket propellant in a nuclear rocket engine. Back in those days a serious accident occurred when hydrogen gas leaked into a large enclosed space and resulted in an explosion. Ten people inside the space sustained injuries including bruises, ruptured eardrums, and fractured bones.

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