Changing Empty Drums - Graco Therm-O-Flow 55-H Instructions-Parts List Manual

Changing Empty Drums

WARNING
MOVING PARTS HAZARD
To reduce risk of injury or damage to
equipment, take care when adjusting
blow off pressure. Too much pressure
can cause the follower plate to rise very
quickly or burst the drum. Too little pres-
sure can cause the ram to lift the entire
drum from the ground.
HOT MATERIAL HAZARD
The material and equipment will be
hot! To reduce risk of injury or damage
to equipment:
Wear eye protection, gloves and
protective clothing when installing,
operating, or servicing this dispensing
system.
Be sure to tighten the bleed stick
after bleeding the air. Otherwise hot
material will leak out of the opening.
PRESSURIZED FLUID HAZARD
Bursts of material and air will exit the
bleed port! To reduce risk of injury or
damage to equipment, wear eye protec-
tion, gloves and protective clothing
whenever working with this supply sys-
tem.
CAUTION
To help avoid damage to equipment:
Be sure to reload the empty supply unit with a full
drum of material immediately. Do not allow the
supply units to operate when empty, which would
cause a pump runaway and cause damage to the
system.
Do not raise the ram and remove the follower
plate from the empty drum until you are ready to
immediately install the new drum.
Do not use a drum of material that has been
dented or otherwise damaged; damage to the
follower wipers may result.
Operation
Do not raise the ram and remove the follower
plate from the empty drum unless the supply
unit is at full operating temperature. Drum
changes can only be performed when the system is
heated. Attempting to change a drum when the
supply unit is cold could result in injury or damage to
the equipment.
An empty drum clamp can interfere with up and
down operation of the ram. When raising or lower-
ing the ram, make sure the drum clamp stays clear
of the follower assembly.
On a heated supply unit, only remove the drum from
the supply unit while the supply unit is at operating
temperature.
Read all warnings, cautions, and instructions
before attempting this procedure!
When a drum of material is empty, follow this proce-
dure to load a new drum of material:
1. Stop the pump by closing the pump's bleed-type
master air valve.
2. Raise the follower out of the drum:
a. Set the ram UP air regulator to 0.07 –
0.10 MPa (0.7 – 1.0 bar) (10 – 15 psi).
b. Move the hand valve lever to the UP position.
At the same time, carefully equalize the pres-
sure in the drum by cycling the follower blow-
off valve open and closed.
3. With the follower completely out of the drum, open
the drum clamp and remove the empty drum from
the ram.
4. Being careful not to damage the follower wiper,
scrape any material or material build-up from the
follower plate and wiper.
5. Apply a lubricant to the wipers. The lubricant
should be compatible with the material to be
pumped. (Check with the material supplier for a
compatible lubricant.)
CAUTION
(continued)
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