![background image](http://html1.mh-extra.com/html/sam/10-ad-11-5/10-ad-11-5_manual-for-operation-and-maintanace_804218015.webp)
15
STARTING AND STOPPING
After coupling alignment and before bolting the coupling halves, check the
pump direction of rotation. Pump rotation is indicated by an arrow
attached to the casing assembly
STARTING:
1
. pump shaft should rotate freely by hand.
2. Check the bearing lubricant
3. Open the valve in the pump suction line.
4. Close discharge valve
5. Prime the pump, If the pump operates under positive head, open vent
valve on top of the pump casing till all entrained air has escaped, close the
vent valves. Rotate the shaft, if possible, to allow any air trapped in the
impeller passages to escape.
6. If the pump operates on a suction lift and a foot valve is included in the
system, fill the pump and the suction line with liquid from an outside
source. Trapped air should be allowed to escape through the vent valve
while filling.
7. If the pump operates on a suction lift and no foot valve is provided, use
a vacuum pump or ejector operated by air, steam, water, etc. to evacuate
air from the pump case and suction line by connecting the ejector to the
priming connection on top of the pump case.
8. Open valves in stuffing box seal lines, if fitted. Start driver. Open
discharge valve slowly when the pump is up to speed.
9. Overheating and / or loss of prime will result if the pump is operated
against a closed valve for more than a few minutes.
10. The coupling guard should be in place when the unit is started. Stay
clear of any exposed rotating parts while the pump is operating. Contact
with rotating parts may result in injury to personnel.
11. Adjust the gland packing, until there is a slight leakage from the
stuffing box. Mechanical seals need no adjustment there should be no
leakage. pumps have limitations as high as 40-50% of the best efficiency
point.