4.2 Air Release Line
It is essential to allow the air to escape from the discharge line to atmosphere during the initial priming
and re-priming cycle. In systems with high discharge heads, it may be advisable to install an air release
line between the pump casing and discharge check valve to aid their venting. The size of the air release
line is selected such that it does not significantly affect the discharge capacity. You may install an air re-
lease line through the filler plug hole if necessary. However, the preferred location is in the discharge line-
between the pump and the discharge check valve-as close to the discharge check valve as possible. We
recommend the following line sizes for the following ITT pumps.
3DTH & 4DTH
3/4" Line
6ETH
1" Line
BGTH & 10GTH
1-1/4" Line
NOTICE:
1.
This line size may be increased or decreased depending on application.
2.
Direct the air release line back into the sump (not into the pump suction line). Leave the end of
the line open to atmosphere. Do not submerge into the liquid being pumped.
3.
The air release line may clog, particularly if a shut off valve is installed in the line and is closed
during operation. If this condition occurs, either use a larger line or leave the shut off valve open
during pumping operation. To aid in maintaining air release lines, fit them with crosses instead of
elbows.
4.2 Air Release Line
30
Model Trash Hog II Installation, Operation, and Maintenance Manual
Содержание Goulds Pumps Trash Hog II
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