Figure 3-47.An oxygas welding outfit.
Being a liquid, MAPP is obtained by the pound,
rather than by the cubic foot, as with acetylene. One
70-pound cylinder of MAPP gas does the work of more
than six and one-half 225-cubic-foot acetylene
cylinders. This is a ratio of 70 pounds of MAPP gas to
about 1,450 cubic feet of acetylene.
Total weight for the 70-pound MAPP cylinder,
which is the same physical size of a 225-cubic-foot
acetylene cylinder, is 120 pounds when full.
MAPP cylinders contain only liquid fuel. There is
no cylinder packing of acetone to impair fuel
withdrawal. For heavy-use situations, a MAPP
cylinder delivers more than twice as much gas as an
acetylene cylinder for longer periods of time. The
entire contents of a MAPP cylinder can be used, since
there is no acetone that could be drawn into the
regulators or the torch. As the gas burns with oxygen, it
produces a flame temperature of 5300°F (2927°C) and
equals or exceeds the performance of acetylene for
Figure 3-48.Auxiliary equipment.