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(c) For Government purchase items (other than Government shipyards): The delegated representative of the Commanding Officer. Naval Ship Systems Engineering Station (NAVSSES), Philadelphia. (d) When delegated by (a), (b), or (c) above, the representative of Defense Contract Administration Services Management Area (DCASMA). (e) Technical representative specifically authorized by NAVSEA. 3.3.1.5 Diving life support piping systems. Diving life support piping systems are piping systems for breathing gases (delivery and exhaust) for divers. 3.3.1.6 Dissimilar metal welds. Dissimilar metal welds are welds between two metals which differ sufficiently in metallurgical and physical properties to require special consideration in welding qualification and inspection. Welds made by either direct joining of the dissimilar metals or by use of weld deposited buttering are considered dissimilar metal welds. 3.3.1.7 Essential elements. "Essential elements" is defined as the essential elements specified in MIL- STD-248. 3.3.1.8 Fabrication welds. Fabrication welds are welds required to fabricate a weldment or welded system. These welds include designed weld joints: weld buildups: overlay cladding for corrosion resistance, hardfacing for wear resistance: and weld deposited buttering. 3.3.1.9 Government inspector. Government inspector is a Government official who is charged with the responsibility for assuring that the materials, processes. fabrication techniques, inspections, tests, and testing personnel weet specification and contractual requirements. In this regard, he shall be the authorized representative or the following: (a) When delegated by the authorized representative, the DCASMA inspector. (b) For forces afloat: The Squadron Commander or his delegated representative. (c) For Naval repair facilities: The commanding officer or his delegated representative. 3.3.1.10 Lethal fluids. Lethal fluids are poisonous gases or liquids of such nature that a very small amount of the gas or vapor of the liquid mixed or unmixed with air is dangerous to human life when inhaled. For purposes of piping system classification, lethal includes substances of this nature which are stored under pressure or which may generate a pressure if stored in a closed vessel. Some such substances are hydrocyanic acid, carbonyl chloride, cyanogen chloride gas, and xylyl bromide. For the piping system classification purposes of this document, ammonia. chloroflurocarbon refrigerants. natural or manufactured gas, any liquefied petroleum
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