Английский для сварщиков. Гричин С.В. - 76 стр.

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76
Welding hose is available in single- and double-hose lengths. Size is
determined by the inside diameter, and the proper size to use depends on the
type of work for which it is intended. Hose used for light work has a 3/16 or
1/4 inch inside diameter and one or two plies of fabric. For heavy-duty
welding and cutting operations, use a hose with an inside diameter of 5/16
inch and three to five plies of fabric. Single hose is available in the standard
sizes as well as 1/2-, 3/4-, and 1-inch sizes. These larger sizes are for heavy-
duty heating and for use on large
cutting machines.
The most common type of
cutting and welding hose is the
twin or double hose that consists
of the fuel hose and the oxygen
hose joined together side by
side. They are joined together by
either a special rib or by clamps.
Because they are joined
together, the hoses are less
likely to become tangled and are
easier to move from place to
place.
The length of hose you use is important. The delivery pressure at the
torch varies with the length of the hose. A 20-foot, 3/16-inch hose maybe
adequate for a job, but if the same hose was 50 feet long, the pressure drop
would result in insufficient gas flow to the torch. Longer hoses require larger
inside diameters to ensure the correct flow of gas to the torch. When you are
having problems welding or cutting, this is one area to check. The hoses used
for fuel gas and oxygen are identical in construction, but they differ in color.
The oxygen hose cover is GREEN, and the fuel-gas hose cover is RED. This
color coding aids in the prevention of mishaps that could lead to dangerous
accidents.
All connections for welding and cutting hoses have been standardized
by the Compressed Gas Association. Letter grades A, B, C, D, and E plus the
type of gas used correspond directly with the connections on the regulators.
A, B, and C are the most common size connections. A-size is for low-flow
rates; B-size for medium-flow rates; and C-size is for heavy-flow rates. D
and E sizes are for large cutting and heating torches.
When ordering connections, you must specify the type of gas the hose
will be carrying. This is because the connections will be threaded differently
for different types of gas. Fuel gases use left-hand threads, while oxygen uses
right-hand threads. The reason for this is to prevent the accidental hookup of
Hoses

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