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welding shield Cover for the viewport area of a helmet or mask to filter excessive light and UV when welding or oxy-arc cutting. wellhead. Main article: Wellhead. The assembly at the surface of an oil or gas well that provides the structural and pressure-containing interface for the drilling and production equipment. wet bell
Shielding gases fall into two categories—inert or semi-inert. Only two of the noble gases, helium and argon, are cost effective enough to be used in welding.These inert gases are used in gas tungsten arc welding, and also in gas metal arc welding for the welding of non-ferrous metals.
A tunnelling shield is a protective structure used during the excavation of large, human-made tunnels. When excavating through ground that is soft, liquid, or otherwise unstable, there is a potential health and safety hazard to workers and the project itself from falling materials or a cave-in.
Marine cathodic protection covers many areas, jetties, harbors, offshore structures. The variety of different types of structure leads to a variety of systems to provide protection. Galvanic anodes are favored, [28] but ICCP can also often be used. Because of the wide variety of structure geometry, composition, and architecture, specialized ...
Bollards are used to protect buildings and people in public spaces from car ramming attacks [21] and accidental collisions. Related protections against deliberate attacks are wedge barriers and archer barriers. [22] The bollards are effective protection against deliberate attacks if properly deployed and maintained.
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