Xylem P81547D Series 90 In-Line Centrifugal Pump - Manual (Page 14)

Check Explanation/comment Checked
Check that the pipeline has isolation valves around
the pump and has a drain valve in the suction pipe.
—
Use PTFE tape sealer or a high quality thread sealant
when you install the suction and discharge
connections to a threaded pump housing.
—
On an open system, check that the end of the suction
pipe is at least 3 ft. below the surface of the water in
the suction well.
This prevents air from being drawn into the
pump. Avoid air pockets in the suction line and
make sure that each section of the suction pipe
is air tight.
Check that new flange gaskets are installed between
the flanges of the pump body end suction and
discharge pipes. make sure that these gaskets are
clean and grease-free.
Suitable fasteners for this connection are
supplied in the Xylem fastener pack. Apply a
torque of 8 to 11 ft. lbs (11 to 15 Nm) to each of
the flange bolts. Both the suction and
discharge flanges must be torqued to the same
level.
Typical installation
1
2
3
4
5
6
7
8
9
10
11
1. Locate the compression tank on the suction side of the pump
2. Rolairtrol air separator
3. System supply
4. Circuit setter
5. Triple duty valve
6. Series 90 pump
7. Suction diffuser
8. Isolation valve
9. Pipe from boiler chiller or converter
10. Cold water supply
11. Reducing valve
Installation
Series 90 Installation, Operation, and Maintenance Manual 13