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ANSI B26
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ANSI B26 25th Edition, 1953 FIRE-HOSE COUPLING SCREW THREAD FOR ALL CONNECTIONS HAVING NOMINAL INSIDE DIAMETERS OF 2 1/2, 3, 3 1/2, AND 4 1/2 INCHES
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Description / Abstract:
Introduction
This standard is intended to cover the threaded part of fire-hose couplings, hydrant outlets, stand-pipe connections, Siamese connecting, and all other special fittings on fire lines where fittings, of 2½, 3, 3½, and 4½ inches nominal diameters are used. It also includes the limiting dimensions of the field inspection gages.
A comparison of the limiting dimensions of the finished product given in Tables 2 and 3 with those originally developed by the National Fire Protection Association Committee and published by that Association in 1970, by the National Board of Fire Underwriters in 1911, By The American Society of Mechanical Engineers in 1913, and by the Bureau of Standards in 1914 and 1917, will show that the two do not conflict. That is, these dimensions are in perfect harmony with the nominal dimensions originally specified for couplings and nipples but are here expressed in a way to ensure the absolute interchangeability of the product. It should be noted also that they determine the size of the finished product and not of the threading tools.
This standard is intended to cover the threaded part of fire-hose couplings, hydrant outlets, stand-pipe connections, Siamese connecting, and all other special fittings on fire lines where fittings, of 2½, 3, 3½, and 4½ inches nominal diameters are used. It also includes the limiting dimensions of the field inspection gages.
A comparison of the limiting dimensions of the finished product given in Tables 2 and 3 with those originally developed by the National Fire Protection Association Committee and published by that Association in 1970, by the National Board of Fire Underwriters in 1911, By The American Society of Mechanical Engineers in 1913, and by the Bureau of Standards in 1914 and 1917, will show that the two do not conflict. That is, these dimensions are in perfect harmony with the nominal dimensions originally specified for couplings and nipples but are here expressed in a way to ensure the absolute interchangeability of the product. It should be noted also that they determine the size of the finished product and not of the threading tools.