A-A-50752A
2.1.8 Copper tubing. The two sections of copper tubing (1/4 inch inside diameter by 5/16 inch outside diameter) will be used for conveying water from the fluid container to the spray nozzle. Both lengths of copper tubing shall enter the interior of the fluid container through the holes in the stopper. The two ends of copper tubing located at the exterior of the fluid container shall connect to the shut-off valve and an external air supply. The section of copper tubing connected to the air supply shall be capable of extending at least 1 inch (25.4 mm) below the bottom of the 2-hole
stopper. The section of copper tubing connected to the shut-off valve shall be capable of extending to within 1/2 inch (12.7 mm) of the bottom of the fluid container. The vertical length of the copper tubing above the container shall be at least 1 inch (25.4 mm) (see figure 1).
2.1.9 Refractometer. A hand-held refractometer shall be capable of measuring the concentration of water soluble industrial fluids. The refractometer shall be capable of checking fluids in a refractive index range of 1.3330 to 1.2860. The readout scale shall be in arbitrary units of 0 to 30 in 0.5 increments. The refractometer shall incorporate automatic temperature compensation over a range of 60 °P to 100 °P. It shall permit direct reading with no correction factor for temperature.
2.1.10 Test panel, stainless steel - 4 each. The sixteen gauge, annealed type 301 or 302 stainless steel panels shall have the dimensions of 2 inches (50.8 mm) by 4 inches (101.6 mm). The
panels shall be oxide blasted on both sides using 100 mesh, aluminum oxide grit (not beads), using 60 psig air pressure, with the gun held normal to and approximately 18 inches (45.72 cm) from the panel surface.
2.1.11 Test panel, chrome nickel plated - set of 2. A set of 2 test panels shall be made from one
0.079-inch (2 mm) thick brass plate 3.94 inches (100 mm) long, and when plated approximately
2.80 inches (71 mm) wide. The brass plate is nickel plated to a predetermined thickness and then flashed or plated with a very thin layer of chromium for protection against tarnish. The
combined thickness of the plating (nickel and chromium) shall be 20 microns (µ) ±1µ. Pine linear cracks, 1µ wide or less, shall be created across the short dimension of the plating. The cracks shall occur through the entire thickness of the plating, but shall not extend into the brass base material of the panel. After the 2.80-inch (71.12-mm) wide panel is plated and cracked, it shall be cut in half lengthwise. This will produce 2 panels measuring 3.94 inches (100 mm) long and 1.38 inches (35 mm) wide.
2.1.12 Radiometer, digital. A portable, hand-held, battery-operated radiometer shall be used for measuring the intensity of ultraviolet (UV) light in fluorescent penetrant and magnetic particle testing applications. The meter shall be capable of measuring UV radiation in a spectral range of at least 335 to 380 nanometers (nm). The radiometer shall be of the digital type with a direct readout in microwatts per square centimeter (µW/cm2). The sensor shall have an accuracy of at least ±5 percent, a linearity of at least ± 1 percent, and a sensitivity range of at least 0-19,990 µW/cm2. Calibration of the UV sensor shall be traceable to the National Bureau of Standards (NBS). The radiometer shall incorporate interchangeable sensor heads that are capable of calibration when detached from the meter. Calibration shall be effected by detaching the sensor head from the radiometer and sending it to a calibration laboratory. Each radiometer shall be supplied with two long wave sensor heads, thus enabling sustained use of the radiometer without calibration interruptions. The radiometer shall be supplied with batteries.
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