8
Meganorm
9.7 Auxiliary piping and connections
Fig. 12 – Auxiliary piping and connections
Dimension – NPT
Thread
Connection Designation
A30 A40 A50 A60
1M.1 Manometer
1/4 1/4 1/4 1/4
1M.2 Manometer
1/4 1/4 1/4 1/4
3M
Vacuum pressure
gauge
1/4 1/4 1/4 1/4
6B.1 Drain
3/8 3/8 1/2 1/2
8B Dripping
1/2 1/2 3/4 3/4
6B.2 Base
drain
1 1 1 1
13D
Lubrication
Ø 20 mm
13B
Drain
1/4 1/4 1/4 1/2
Table 3
9.8 Coupling guard
For increased safety in operation, coupling guards should be
installed. They are made of steel or brass and fixed to the
base.
Check that the coupling guard is not in touch with moving
parts.
9.9 Instruments
It is recommended to use pressure gage and vacuum meter
on discharge and suction pipes respectively for a better
operation control.
Their ranges must correspond to 150% of highest pumping
pressure.
Instruments must be equipped with valves.
When pumping chemicals and agressive liquids, the
instruments and their valves should be made of proper
materials.
In order to obtain a longer useful life the valves should be
open only to read the instruments and then closed again.
10. Operation
10.1 First
starting
procedure
The following items must be provided for pump first startup:
a) Pump and its driver must be securely fastened to the base
plate;
b) Fix firmly the suction and discharge pipelines;
c) Connect and run auxiliary pipelines and connections (if
any).
d) Wiring should be done upon assuring that all motor
thermal overload protections are securely and adequately
connected and set.
e) Check bearings for cleanliness and dampness. Fill
bearing bracket with oil in quantity and quality as specified
in item 11.
f) Check the rotation direction of driver without coupling the
pump to avoid dry operation.
g) Manually check for the free running of the moving parts.
h) Check that the proper coupling alignment according to
item 9.4 has been performed.
i) Mount coupling guard (if any).
j) Prime pump by filling it and suction pipeline with water or
with the liquid to be pumped, bleeding internal air
simultaneously.
k) Check that the gland cover nuts are just fitted, without
tightening them (pumps with packing).
l) Fully open suction valve (if any) and close discharge
valve.
10.2
Immediate steps after first start-up
Once the pump has started and is already in normal
operation, please follow the instructions below:
a) Adjust pump to its operation point (pressure and flow) by
opening slowly the discharge valve shortly after pump
drive has reached its nominal speed.
