S9074-AR-GIB-010/278
3.3.1.22 Straw (color). Straw is a color occurring on titanium welds from slight contamination whose hue ranges from pale yellow through brass. 3.3.2 Classification. The following classifications are applicable to this document: (a) Machinery, class M. (1) Class M-1. Class M-1 machinery includes welds in moving parts, such as gears, rotors, impellers and shafting (except propulsion shafting and rudder stocks) that transmit torque or thrust. Welding of propulsion shafting and rudder stocks shall conform to MIL-STD-2191. (2) Class M-2. Class M-2 machinery includes welds in stationary non-pressurized assemblies or structures, such as sub-bases for turbines, engines, motors, and pumps. Each of these sub-classes shall be further categorized as to criticality in accordance with the following: a. Category A. Safety and mission of the ship. Safety. Includes machinery forming part of, or directly supporting. watertight integrity or machinery the failure of which would cause loss of ship control, propulsion, or weight handling equipment. Mission. Machinery essential to the mission of the ship, such as weapon and fire control systems, navigation communication systems. and major auxiliary support systems. b. Category B. Normal operation of the ship. Machinery essential to the normal operation of the ship. c. Category C. Non-essential items. Includes parts of components in categories A and B having welded joints that do not transmit the principal operating load or support any type of pressure boundary. (b) Piping, class P. Class P piping includes all piping. tubing, and fittings for conveying fluids. Classes P- 1. P-2, and P-LT apply to welded systems. Class P-3 applies to brazed systems. (1) Class P-1. Class P-1 includes fabrication welds for design pressures exceeding 300 pounds per square inch (1b/in2) or design, temperatures exceeding 650 degrees Fahrenheit (°F), or both, such as steam lines. hydraulic systems, boiler generating tubes, superheater and economizer elements, other pressure retaining tubes and piping (excluding nozzle or root connections to pressure vessels, which are covered under the appropriate classification), and all piping systems for conveying oxygen, gasoline, and lethal gases or liquids regardless of pressure and temperature. This class also includes fabrication welds
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