(2) Dedenting. This is done by applying an 80 psig internal water
pressure. Equipment used includes:
(a)
A holding stand for clamping drum heads with two plates,
to prevent bulging under water pressure.
(b)
Motor-driven water pump with sump and suitable drainage.
(c)
Conveyor to either bypass this operation or move drums
to next operation.
(3) Chaining. Where indicated after inspection of cleaned drum,
this operation is to remove accumulated interior rust and scale. It is done
by inserting 25 feet of chain into the drum and adding one quart of caustic
solution (similar to washing). Equipment used includes:
(a)
Stand with rubber-surfaced wheels and clamps for lock-
in& a drum in place for rotation tilting.
(b)
Means to actuate drum rotation and tilting, first toward
one end and then toward the other.
(c)
Timing equipment for oscillation and rotation for an
approximate 20-minute cycle.
(d)
High pressure spray nozzle for washing loosened scale
and rust from drum interior after operation is completed.
(e)
Conveyor either to bypass this operation or to move
drums to next operation.
(4) Wire Brushing. This operation prepares drum exterior surfaces
for painting. Equipment used includes:
(a)
An enclosed machine, with exhaust ventilation, to
shot-blast rotating drums and wire brush both heads and sides.
(b)
Timing device to vary wire brushing time between 1 and
3 minutes.
(c)
Automatic drum loading and unloading.
(d)
Conveyor to move drums to next operation.
(5) Chime Rolling. The purpose of this operation is to straighten
chimes and tighten them against leakage. Equipment used includes:
(a)
Machine with suitable drum mounting stand and rollers
which can apply sufficient pressure to the chimes.
(b)
Means of rotating drums and heating the chimes during
rolling to cause the chime sealing compound (in the drum when manufactured) to
flow and ensure sealing. A hand blowtorch can be used for necessary chime
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