Bell & Gossett DN0141D Domestic Pump 2′ NPSH Horizontal Pumps Series DB-F - Manual (Page 2)

2
DESCRIPTION
These horizontal end suction pumps feature a flow inducing
propeller and one or two impellers in series. These pumps
are supplied with or without mounting base (except for the
DB-F which requires a mounting base). All pumps are con-
structed with mechanical seals intended for high temperature
operations.
All models are bronze fitted with replaceable bronze wear rings.
APPLICATION
The 2' NPSHR rating of these pumps makes them uniquely
suited to pumping hot water. With 2 feet of static suction head,
the pumps will pump boiling water. Typical applications are on
condensate return and boiler feed systems.
These pumps are also well suited for general pumping service
of benign liquids.
PRELIMINARY INSPECTION
Assure that there is no shipping damage.
Assure that nameplate ratings agree with job specifications and
actual conditions.
PUMP LOCATION
Locate the pump so there is sufficient room for inspection,
maintenance and service. If the use of a hoist or tackle is
needed, allow ample head room.
LOCATION
The best pump location for sound and vibration absorption
is on a concrete floor with sub soil underneath. If the pump
location is overhead, special precautions should be under-
taken to reduce possible sound transmission, consult a sound
specialist.
If the pump is not installed on a closed system, it should be
placed as near as possible to the source of the liquid supply,
and located to permit installation with the fewest number of
bends or elbows in the suction pipe.
The installation must be evaluated to determine that the Net
Positive Suction Head Available (NPSHA) meets or exceeds the
Net Positive Suction Head Required (NPSHR) as stated by the
pump performance curve.
INSTALLATION
This pump is built to provide years of service if installed prop-
erly and attached to a suitable foundation. A base of concrete
weighing 2 1 /
2
times the weight of the pump is recommended.
(Check the shipping ticket for pump weight.)
If possible, tie the concrete pad in with the finished floor. Retain
access to pump mounting screws of DB-F pumps.
To facilitate easy servicing, some type of expansion fitting
should be utilized. The female portion should be inserted into a
suitable hole in the floor so that its top surface is flush with the
floor surface. Thus, when the hold-down bolts are removed,
the motor can be removed by sliding it back from the pump.
(See below.)
WARNING: EXPLOSIBLE
Maximum suction pressure is 35 psi unless otherwise
specified by manufacturer. Do not exceed this pressure.
Failure to follow these instructions could result in serious
injury or death.
CAUTION: NOT A CHEMICAL PUMP
Inject boiler feed compounds from chemical feed tank
into boiler feed piping – never into pump suction. Failure to
follow these instructions could result in injury or property
damage.
WARNING: Eyebolts or lifting lugs if provided are for
lifting only the components to which they are
attached. If lifting of the entire pump is required, do so with
slings placed under the pump assembly as shown. Failure
to follow these instructions could result in injury or death.
FOUNDATION BOLT
PIPE SLEEVE
WASHER
BUILT-UP
CONCRETE FOUNDATION