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These color-codes for thread sealing tape were introduced by Bill Bentley of Unasco Pty Ltd in the 1970s. In the UK, the tape is used from coloured reels, e.g. yellow reels for gas, and green for oxygen. White: used on NPT threads up to 3 ⁄ 8 inch; Yellow: used on NPT threads 1 ⁄ 2 inch to 2 inch, often labeled "gas tape"
The Air Corps-Navy involvement is also the origin of the red/blue color combination that was traditionally used in the anodized finishing process. [ 1 ] AN sizes range from -2 (dash two) to -32 in irregular steps, with each step equating to the OD (outside diameter) of the tubing in 1 ⁄ 16 -inch increments.
At its annual convention at Dallas, TX, the NFPA formally adopted a standard with 2 + 1 ⁄ 2-inch hose with 7.5 threads per inch as the primary standard, with additional sizes of 3 and 3.5 inches (each with 6 threads per inch) and a 4.5 inch coupling with 4 threads per inch, with the fire hydrant standard specifying one 4.5 inch port and two 2 ...
A hose coupling is a connector on the end of a hose to connect (or couple) it with another hose or with a tap or a hose appliance, such as an irrigation sprinkler. It is usually made of steel , brass , stainless steel , aluminium or plastic .
This type of tape is also described, particularly in the United States, as "self-fusing", [3] [4] or "self-vulcanizing". In the US Air Force (and elsewhere) it is called centerline tape due to a colored line running down the center used to assist with even wrapping. It is sold under a variety of brand names, including "F4 tape", "Tommy Tape ...
This fitting is used with 1 ⁄ 2-inch, 5 ⁄ 8-inch, and 3 ⁄ 4-inch hoses. [4] [5] In other countries, a British Standard Pipe (BSP) thread is used, which is 3 ⁄ 4 inch (19 mm) and 14 TPI (male part outside diameter is 26.441 mm or 1.04 in). The GHT and BSP standards are not compatible, and attempting to connect a GHT hose to a BSP fitting ...
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