Welch Vacuum 1376N Chemstar - Manual (Page 22)

Section 11: APPLICATION BOOKLET
USING YOUR CHEMSTAR VACUUM PUMP WITH CORROSIVE GASES
Thank you for choosing the CHEMSTAR vacuum pump from Welch Vacuum Technology, Inc. This unique vacuum pump
line was designed to give you the maximum possible service life when evacuating corrosive gases. However, corrosive
gases can cause damage to the most rugged vacuum pump in an improperly confi gured or improperly operated vacuum
system. Please refer to the recommendations made in the following pages for operating your CHEMSTAR vacuum pump
successfully when pumping corrosive gases.
Table of Contents
Part 1 Health & Safety
Part 2 Building a Vacuum System to Handle Corrosive Gases
A. Selecting The Correct Vacuum Pump Oil
B. Connecting Your CHEMSTAR Pump to the Vacuum System
C. Types of Accessories Available
D. Insuring An Adequate Exhaust System
Part 3 Operating a Vacuum System Containing Corrosive Gases
A. Removal of Condensable Corrosive Gases Using the Gas Ballast
B. Diluting Corrosive Gases
C. Dry Nitrogen Purging of Oil Case
Part 4 Recommendations for Pumping Corrosive Gases
A. Strong Acids: Hydrochloric Acid (HCI), Hydrogen Bromide (HBr),
Sulfuric Acid (H
2
SO
4
), Nitric Acid (HNO
3
)
B. Weak Acids: Acetic Acid (HOAC), Carbonic Acid (H
2
CO
3
)
C. Halogens: Chlorine (CL
2
), Bromine (Br
2
)
D. Formaldehyde (CH
2
0)
E. Trifl uoroacetic Acid (F
3
CCO
2
H)
F. Ozone (O
3
)
G. Anhydrides:
SO
X
- Sulfur Trioxide (SO
3
) & Sulfur Dioxide (SO
2
)
Hydrogen Sulfi de (H
2
S)
H. Fragments of Sulfur Hexafl uoride (SF
6
) Carbon
Tetrafl uoride (CF
4
) etc.
I. Special Note: Pumping oxygen
***Perfl uoropolyethers Oil Needed In Pump***
Part 5 Recommendations for Pumping Particulate-Containing Gas Streams
A. Particulate Trap With A Filter Element
B. Oil Filtration System
Part 6 Extending Service Life of CHEMSTAR through Proper Maintenance
A. Developing A Maintenance Schedule
B. Forced Oil Flushing
Part 7 Vacuum Manifold
Part 8 Chemical Properties of Corrosive Gases
Part 9 Troubleshooting Your CHEMSTAR Pump
22