Service Kits; Taking The Product Out Of Operation; Protecting The Pump During Periods Of Inactivity And Frost; Short-Term Shutdown - Grundfos NBS Serie Instrucciones De Instalación Y Operación

8. Remove the fork tool and measure the run-out (A: 0.004
inch/0.1 mm) on the shaft.
A
9. Assemble the fork tool into motor stool.
10. Install the coupling guards.

8.3 Service kits

For the service kits, see Grundfos Product Center at www.
grundfos.com or in the Service Kit Catalog.

9. Taking the product out of operation

9.1 Protecting the pump during periods of inactivity and
frost
Pumps that are not being used during periods of frost must be
drained to avoid damage.
WARNING
Escaping liquid
Death or serious personal injury
‐
Ensure that the escaping liquid does not cause
personal injury or damage to the motor or other
components.
‐
In hot-liquid installations, pay special attention to the
risk of personal injury caused by scalding hot liquid.
‐
In cold-liquid installations, pay special attention to the
risk of personal injury caused by cold liquid.
1. Drain the pump by removing the drain plug.
M
E
Drain plug (E), priming and venting plug (M)
2. Do not tighten the priming plug or replace the drain plug until the
pump is to be used again.
3. If the pump is to be drained before a long period of inactivity,
inject a few drops of silicone oil on the shaft at the bearing
bracket. This will prevent the shaft seal faces from seizing up.
18

9.2 Short-term shutdown

For overnight or temporary shutdown periods under nonfreezing
conditions, the pump may remain filled with liquid. The pump must
be fully primed before restarting.
For short or frequent shutdown periods under freezing conditions,
the liquid must be kept moving within the pump housing and the
pump exterior must be insulated or heated to prevent freezing.

9.3 Long-term shutdown

For long shutdown periods, or to isolate the pump for maintenance,
the inlet gate valve must be closed. If no inlet valve is used and the
pump has positive inlet pressure, all liquid must be drained from the
inlet line to stop the liquid flow from entering the pump inlet. The
plug in the pump drain and vent holes must be removed, as
required, and all liquid must be drained from the pump housing.
If there are freezing conditions during long shutdown periods, the
pump must be drained completely, and all liquid passages and
pockets must be blown out with compressed air. Freezing of the
pumped liquid can also be prevented by filling the pump with
antifreeze solution.

9.4 Storing the product

1. If you do not operate the pump soon after arrival, store it in a
clean, dry place under slow, moderate changes in ambient
temperature.
2. Protect the pump from moisture, dust, dirt and foreign bodies.
Before and during storage we recommend the following
precautions:
a. Make sure that the inlet and outlet ports and all other
openings are covered with cardboard, wood or masking tape
to prevent foreign objects from entering the pump.
b. If the unit is to be stored where there is no protective
covering, cover it with a tarpaulin or waterproof material, or
other suitable covering.
c. Rotate the shaft two turns every two weeks to prevent
corrosion of the bearing surfaces and the stuffing box or shaft
seal faces caused by moisture.
3. If the pump is to be stored for more than six months before
being put into operation, apply a suitable corrosion inhibitor to
the internal pump parts.
Make sure that the corrosion inhibitor used does not affect the
rubber parts with which it comes into contact.
Commercially available preservatives can be used for this
purpose. Please observe the manufacturer's instructions for
application or removal.
4. Keep all openings covered until the pipes are ready to be fitted
to prevent water and dust from entering the pump.
The cost of having to dismantle the pump during startup to
remove foreign objects can be very high.