Английский для сварщиков. Гричин С.В. - 70 стр.

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70
Cylinder Design
Acetylene can be safely compressed up to 275 psi when dissolved in
acetone and stored in specially designed cylinders filled with porous material,
such as balsa wood, charcoal, finely shredded asbestos, corn pith, portland
cement, or infusorial earth. These porous filler materials aid in the prevention
of high-pressure gas pockets forming in the cylinder.
Acetone is a liquid chemical that dissolves large portions of acetylene
under pressure without changing the nature of the gas. Being a liquid, acetone
can be drawn from an acetylene cylinder when it is not upright. You should
not store acetylene cylinders on their side, but if they are, you must let the
cylinder stand upright for a minimum of 2 hours before using. This allows the
acetone to settle to the bottom of the cylinder.
NOTE: Acetone
contaminates the
hoses, regulators,
torch, and disrupts the
flame.
Acetylene is
measured in cubic
feet. The most
common cylinder
sizes are 130-, 290-,
and 330-cubic-foot
capacity. A common
standard size cylinder
holds 225 cubic feet
of acetylene. Just
because a cylinder has
a 225-cubic-foot
capacity does not necessarily mean it has 225 cubic feet of acetylene in it.
Because it is dissolved in acetone, you cannot judge how much acetylene is
left in a cylinder by gauge pressure. The pressure of the acetylene cylinder
will remain fairly constant until most of the gas is consumed.
An example of an acetylene cylinder is shown in figure above. These
cylinders are equipped with fusible plugs that relieve excess pressure if the
cylinder is exposed to undo heat. A common standard acetylene cylinder
contains 225 cubic feet of acetylene and weighs about 250 pounds. The
acetylene cylinder is yellow, and all compressed-gas cylinders are color-
coded for identification. More on the color coding of cylinders is covered
later in this lesson.

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