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The pin index safety system uses a face seal between the cylinder valve and the associated yoke clamp. There are two holes in specific positions on the cylinder valve body below the outlet port , in positions associated with the gas mixture, which prevent connection of the cylinder to a yoke or pressure regulator with a mis-matched set of pins.
An open circuit SCBA typically has three main components: a high-pressure gas storage cylinder, (e.g., 2,216 to 5,500 psi (15,280 to 37,920 kPa), about 150 to 374 atmospheres), a pressure regulator, and a respiratory interface, which may be a mouthpiece, half mask or full-face mask, assembled and mounted on a framed carrying harness. [2]
The National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) of 1000 ppm (1800 mg/m 3) over an 8-hour workday and 1250 ppm (2250 mg/m 3) for short-term exposure. At levels of 3400 ppm, 10% of the lower explosive limit, MAPP gas is immediately dangerous to life and health. [9]
[13] [14] Composite cylinders certified to ISO-11119-2 or ISO-11119-3 may only be used for underwater applications if they are manufactured in accordance with the requirements for underwater use and are marked "UW". [15]
Russian manufacturer Poisk has supplied breathing apparatus since 1982, using a small and lightweight titanium and kevlar filament wound cylinder of 3.5 kg with an endurance of 6 hours at 2 litres per minute, with regulators that could be adjusted in increments of 0.25 litres per minute up to 4 litres per minute. [31]
The difference in PO 2 can be used to calculate PHe, or conversely, a desired trimix product partial pressures can be used to calculate the PO 2 for the nitrox and trimix stages of the blend. Example: Desired product 50% helium, 16% oxygen, remainder nitrogen (34%). The PO 2 after the helium addition must be 0.16 bar if there is negligible ...
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related to: oxygen cylinder length chart printable template for 3 kids 2