ITT ICM, Installation And Operating Instructions Manual

Page: 17 / 34

Installation and Operating Instructions
Model
ICM, ICMP
,
oil bath lubrication
9330-051-en
Revision 14
TM 6099 MPE/Wm
Page 8
Date 24/08/2011
2.5.4 Check of the direction of rotation
If there is also a risk of explosion during the
installation phase, the check of the direction of
rotation must under no circumstances be con-
ducted by briefly switching on the unfilled pump in
order to prevent an inadmissible rise in temperature at
the plain bearings.
We recommend you to only perform a check
of the direction of rotation with the coupling
disengaged or with a rotating field instrument.
See also
Section 6.1.2.
2.5.5 Mode of operation of the pump
The pump may only be started with the suction side
shut-off element fully opened and the discharge side
shut-off element slightly opened. Start-up against a
closed check valve is also possible. The discharge
side shut-off element is to be regulated to the operat-
ing design point directly after run-up.
See also
Section 5.4.1 .
Operation with closed shut-off elements in the
suction and/or discharge lines is not permitted!
There is a risk that even after a short time
high surface temperatures on the pump hous-
ing may occur owing to rapid heating of the
liquid in the pump interior.
A rapid rise in the pressure inside the pump
involves the risk of overloading to the point of
bursting.
The pump must not be in operation in the unfilled
or partially filled state (dry running). This
results in serious damage to the pump and
additional risks to the environment can
arise.
Dry-running cannot only occur with an insuffi-
ciently filled interior but also in the event of
high gas contents in the liquid medium.
Operation of the pump outside the admissible operat-
ing range may also lead to dry-running (e.g. due to
evaporation in the interior).
2.5.6 Temperature limits
In normal operating mode the highest tem-
peratures are to be expected at the contact
point shaft seal/shaft (only with oil bath lubri-
cation), on the inner races of the rolling bearings and
at high medium temperatures on the metallic can.
In the case of liquids > 40 °C the surface temperature
of the pump housing is generally lower than the tem-
perature of the liquid.
If the pump is heated (e.g. heating jacket), it
must be ensured that the temperature classes
prescribed in the annex are observed.
The entire pump surface must have free contact with
the environment.
During operation of the pump it must be en-
sured that excessive deposits of dust are pre-
vented (regular cleaning) in order to prevent
the pump surface from heating to above the admissi-
ble temperature.
The plant customer must ensure that the pre-
scribed operating temperature is observed. The
maximum admissible temperature of the liquid
medium at the pump inlet depends on the tem-
perature class and the selected lining material
required in each case.
The following table contains the resultant theoretical
limit values of the temperature of the liquid medium
allowing for the temperature classes according to EN
13463-1.
Temperature class
acc. to EN 13463-1
Limit value of the temperature
of the liquid
LT HT
T6 (85 °C)
T5 (100 °C)
not certified to ATEX
T4 (135 °C) 110 °C
1), 2)
110 °C
1), 2)
T3 (200 °C) 175 °C
2)
175 °C
2)
T2 (300 °C) 175 °C
2)
275 °C
2), 3)
T1 (450 °C) 175 °C
2)
275 °C
2), 3)
HT = High temperature LT = Low temperature
1) Long life grease lubrication: no restriction.
Oil bath lubrication: standard version with shaft seal T3
labyrinth seal (special design) T4 .
2) The limit values specified for the temperature of the medium at
the pump inlet are determined for the most unfavourable case
(high speed, low flow rate, low heat capacity of the medium,
large magnetic drive ....). Under favourable operating conditions
the limit values specified may be increased by up to 10 K after
consultation with the manufacturer.
3) Consult the manufacturer for higher temperatures than 280 °C.
The admissible operating temperature of the
pump is indicated in the data sheet.
Observance of the temperature class T4 with oil
bath lubrication is not possible with the standard
shaft seal. A labyrinth seal must be used instead
of the shaft seal for the temperature class T4 and
with oil-lubricated rolling bearings.