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Conveying System Mechanical Components Chapter 3: Installation 46 of 138
• Use piping or ducting at least two (2) diameter sizes larger than the vacuum
connection. Overall vent pipe length—horizontal plus vertical—should not exceed 100
feet (about 30 m) and should not include more than three (3) elbows. If you use pipe
for venting, make sure that you use Sch. 5 or Sch. 10 pipe with long radius elbows to
provide minimum airflow resistance. If you use ducting, make sure you use high-
pressure ducting with mitered bends—with a minimum of three (3) breaks—for
minimum airflow resistance. Make sure all piping connections are properly supported.
• If you are venting pump discharge outdoors, make sure you properly terminate vent
piping to prevent pump damage. You can either:
a. Install a rain cap, or
b. Install the piping so the exhaust faces down and terminates with a screened
opening.
Note: If the pump becomes contaminated from rain or airborne particulates, or is
damaged by birds, insects, or small animals, your warranty becomes void!
Any variance from these guidelines can cause excessive pump backpressure.
Such a condition can drastically affect equipment performance, possibly
leading to equipment damage.