Instruction manual

37
High Throughput Diffusion Pumps
DRAFT 12/23/04
Cleaning
Cleaning Safety
Cleaning a diffusion pump involves the use of acetone
and alcohol, both of which are toxic and explosive. Take
careful note of the following warnings before starting a
cleaning process.
When heated, sprayed or exposed to high temperature
equipment, these solvents become flammable and explo-
sive, causing serious injury or death.
When heated or sprayed, acetone or alcohol also
becomes 4 to 5 times heavier than air and will flow
down, settling in tanks, pits, and low areas, thus displac-
ing air which can kill by asphyxiation.
Acetone, alcohol, and other solvents are irritants, narcot-
ics, depressants, and carcinogenic. Their inhalation and
ingestion may produce serious effects. Prolonged or con-
tinued contact with the skin will result in absorption
through the skin and moderate toxicity.
Complete cleaning of the pump may be required due to
gradual deterioration of pump fluids. Removal of the
pump from the system is then necessary.
To clean an installed pump:
1. Disconnect all water cooling lines and break the
primary circuit supplying power to the pump heaters.
2. Unbolt the inlet and foreline connections and remove
the pump from the system.
3. Drain the pump of all fluid.
4. Remove the cold cap as described in “Cold Cap” on
page 38.
5. Remove the jet assembly as described for the specific
pump model in “Jet Assemblies” on page 39.
6. Thoroughly clean the pump body interior using
acetone followed by an isopropyl alcohol rinse and
then dry the pump with clean, dry, oil-free
compressed air.
7. Thoroughly clean the jet assembly using acetone.
Wipe all surfaces with isopropyl alcohol, and dry
with clean, dry, oil-free compressed air.
8. Reinstall the jet and cold cap in the pump body. Be
sure that the ejector is properly aligned with the
foreline.
9. Check the condition of the O-rings. Replace O-rings
that show any sign of wear or compression.
10. Attach the pump in the system.
WARNINGS ❑ Do not use near a high
temperature source. Ventilate
the working area with a blower
and use in a large, well-ventilated
room. The use of a self-contained
breathing apparatus may also
be necessary.
❑ Always ensure that cleaning
operations are carried out in
large, well-ventilated rooms.
Wear eyeshields, gloves, and
protective clothing.