RDL
After the operating temperature has been reached, re-check the coupling alignment as described in section
5.5 and re-align, if necessary.
6.1.7.1 Necessary steps for 1
st
operation
a) Tighten the pump and driver on the baseplate;
b) Set suction and discharge piping;
c) Connect and run piping and auxiliary connections (when required);
d) Make electric connection assuring that all motor protection devices are appropriately adjusted and working;
e) Assure that bearings are properly lubricated. For details see chapter 7.3;
f) Check drive rotation with pump not coupled to avoid pump dry operation;
g) Certify manually that rotor rotates free;
h) Assure that coupling alignment was executed according to chapter 5.5
i) Install the coupling guard (if any);
j) Prime the pump, that means, fill the pump and suction piping with water or pumped liquid, eliminating air from inside the
pump. See chapter 6.1.3;
k) Assure that packing is not completely tightened;
l) Open totally the suction valve (if any) and close discharge one.
Check carefully above mentioned points, start the drive machine and turn it off immediately. Check the equipment stop which
should be slow and smooth. If the pump is normal, start up definitely.
6.1.7.1.1 Methods for pump priming
a) Installation with positive suction.
In case of installation with positive suction, that means, pump is installed below the suction reservoir level, plugs 916.6,
903.5, 903.1 and 903.4 (if any) should be removed and suction valve opened so the pumped liquid comes to the higher
part of the pump.
Place the threaded plugs back and the pump will be primed.
b) Installation with negative suction
In case of installation with negative suction, that means, pump is installed above the suction reservoir level, for priming it is
necessary to have a foot valve or to prime by partial vacuum.
b1) Priming with filling and foot valve
Remove threaded plugs 916.6, 903.5, 903.1 and 903.4 (if any). Fill the pump and suction piping with water or pumped
liquid through the plug located in the higher point of the pump. The foot valve will prevent the liquid to return to the suction
reservoir. When leaking through the higher point of the pump starts, equipment used to fill (filler, hose, piping with register,
etc) must be removed and place threaded plugs back.
b2) Priming with by-pass of check valve.
In large installations, pump and discharge piping can be filled
Remove threaded plugs 916.6, 903.5, 903.1 and 903.4. Open partially the discharge valve. Open by-pass line of check
valve until the liquid reaches the higher part of the pump. Close valves, place threaded plugs back and pump will be
primed.
b3) Priming with partial vacuum (ejector)
The principle of ejector working is based on the pressure condition created by the passage of a pressurized flow through a
piping with different sections. This condition allows air extraction from the pump casing and suction piping, creating a
vacuum and making the pumped liquid lift to suction reservoir. When tank level starts rising it means that the main pump is
already primed. After start up of main pump, turn the auxiliary pump off and close “R” register.
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