Varisco S.p.A.
Z.I. Nord - Terza Strada, 9 - 35129 PADOVA – ITALY
Tel.+39.049.8294111 Email: [email protected]
Fax+39.049.8076762 Web: www.variscospa.com
13
7 STARTUP
IMPORTANT
•
Never operate the pump when dry
- this is mandatory, otherwise the stator, made of
elastomeric material will overheat and may burn. A few seconds are enough to cause
damage to the stator.
•
The eccentric screw pump is of the positive displacement type;
therefore it shall NEVER
be operated with a closed delivery valve
. Since the theoretical pressure is infinite, this
would cause excessive stress with partial or total damage to the pump or piping.
•
Before startup, check that the direction of rotation were correct.
7.1 ADVICE FOR OPTIMAL OPERATION
To achieve long life and high performance, it is useful to follow these recommendations:
•
The pump is self-priming, but it is advisable to fill its body with the liquid to be pumped
before the first startup.
•
Control the rate of delivery by modifying the rpm of the motor instead of setting choking
valves.
•
Install an immediate stop device in case of absence of liquid at intake, by means of a
temperature sensor on the stator, to stop the pump after a few seconds of dry operation.
7.2 PUMPS FOR FOOD
The startup of pumps to be used with food requires the plant to be perfectly clean. Cleaning may be
performed in two ways:
•
Disassemble the pump and wash every part of it with suitable detergent. Re-assemble the
parts making sure they stay clean.
•
Perform Cleaning in Place (CIP) if the pump is suitable for this kind of cleaning.
7.2.1 WHEN TO PERFORM CLEANING
•
Before startup
•
After a prolonged stop
•
After replacing parts
•
After use if a prolonged stop is foreseen
LENGTH
L
PUMP
1 STAGE 2 STAGE 3 STAGE 4 STAGE
010 -
80 -
-
015 80 160 -
-
020 110 170 -
360
030 160 300 -
-
040 200 420 -
-
050 260 -
530 -
053
- - - 530
055 270 550 -
980
060
440
- - 1230
062 320 630 -
-
080 440 880 -
-
120
500
- - -
200
540
- - -
300 540 1050
-
2110
400 660 1260
-
-
500 820 1580
-
-
