
SINCE 1981
12
CONDENSATE AND
BOILER FEED UNITS
OPERATION, MAINTENANCE
AND INSTALLATION MANUAL
Selection of discharge piping
In selecting condensate pumps and making proper piping connections, the friction in the discharge line
from the pump to the boiler is very important. The pressure drop due to friction is sometimes much
greater than the boiler pressure. In some cases, using larger discharge piping will make it possible to
use a less expensive pump with a lower pressure rating. In all cases, adequate discharge piping will
mean tonger life and better service from your pump. The pressure drop due to friction should always
be estimated carefully. using the gallons-per-minute rating of the pump as a basis and referring to
The discharge pipe size and pump pressure rating should be selected so that the pump pressure rating
will provide a generous margin of safety over and above the friction pressure drop plus the lift from
will operate. Usually, the best discharge pipe size will be at least one size - sometimes two
sizes - larger than the pump outlet tapping. If possible, piping from the condensate pump outlet
be avoided, it should be vented at the highest point.
Float switch settings
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a small amount of condensate will be discharged each time the pump operates and consequently the
motor will have to start and stop too frequently. In normal operation, it is usually undesirable for a
level may fall too low before the pump starts. Then the boiler low-water cutoff will operate unneces-
may continue running until it loses its prime and the rotary seal may be damaged by running dry.
from the tank to the pump is covered with water at all times. Any condensate pump can be used for
switch settings. Therefore, many of these units can be used for larger capacities than the nameplate
checked by inserting a yardstick into the vent opening at the top of the tank
I.O.M - POMPE VERTICAL CENTRIFUGE - CVC