API 4000 Site Planning Guide
System Requirements
15
Exhaust Requirements
Exhaust from the API 4000 instrument originates from the source exhaust and roughing
pump(s).
Source Exhaust Pump
During operation, solvent vapors and effluent are exhausted from the vent chamber under
the ion source housing by the source exhaust pump (venturi pump) to a 1.27 cm (0.50 in.)
barbed fitting. This effluent must be drained to a drain vessel and vented to a fume hood or
an outside port. It is the responsibility of the customer to provide the proper plumbing
from the drain vessel to the ventilation point.
Roughing Pump Exhaust
The customer will be provided with the installation kit that includes a smoke eliminator
(mist filter) for the roughing pump(s). The system includes fittings and tubing to connect
the roughing pump(s) to the fume hood or other vents.
Venting System Recommendations
The following are recommendations for a customer-supplied vent system that may be used
to vent the roughing pump(s) and the ion source exhaust.
The exhaust flow rate at the instrument (the ability to vent the system) is dependent on the
blower provided by the customer, the duct length, the material and the number of elbows
(or bends) used. If an excessively long duct system or a system with many bends is used, a
stronger blower may be necessary to provide sufficient exhaust volume at the instrument.
Smooth stainless steel tubing should be used instead of flexible stainless steel tubing
where flexibility is not required to reduce system friction loss or drag. A length of smooth
stainless steel ducting has 20 to 30% less friction loss than a comparable length of flexible
ducting. When smooth stainless steel tubing is used, elbows must be used to turn corners.
These elbows should turn at an angle of 45 degrees to reduce friction losses, and a
minimum number of elbows should be used.
Additional recommendations for the venting system include the following items:
•
The duct casing and venting system should be made of materials suitable for
temperatures as high as 70
°
C (158
°
F) and should meet local building standards.
•
The vent system should produce a static vacuum of approximately 2 cm (0.75 in) of
water.
•
The blower should be located as close to the discharge outlet as possible. All joints on
the discharge side should be airtight.
•
The outlet end of the system should be equipped with a backdraft damper and the
necessary precautions should be taken to keep the exhaust outlet away from open
windows or inlet vents. The exhaust outlet should extend above the roof for proper
dispersal.
•
The exhaust end of the system should be equipped with an exhaust stack to improve
the overall efficiency of the system.
