Flowserve U-MAG INNOMAG User Manual
Page 7
U-MAG ENGLISH 26999990 10-14
Page 7 of 40
Never change conditions of service
without approval of authorized Flowserve distributor.
Excessive amounts of dust collected on the
pump housing may lead to an increase in surface
temperature, possibly exceeding temperature limits.
May require regular cleaning.
Always have this service manual available during any
installation or maintenance.
1.6.4 Products used in potentially explosive
atmospheres
Measures are required to:
Avoid excess temperature
Prevent build up of explosive mixtures
Prevent the generation of sparks
Prevent leakages
Maintain the pump to avoid hazard
The following instructions for pumps and pump units
when installed in potentially explosive atmospheres
must be followed to help ensure explosion protection.
For ATEX, both electrical and non-electrical equipment
must meet the requirements of European Directive
2014/34/EU (previously 94/9/EC which remains valid
until April 20
th
2016 during the transition). Always
observe the regional legal Ex requirements eg Ex
electrical items outside the EU may be required certified
to other than ATEX eg IECEx, UL.
1.6.4.1 Scope of compliance
Use equipment only in the zone for which it is
appropriate. Always check that the driver and pump
equipment are suitably rated and/or certified for the
classification of the specific atmosphere in which they
are to be installed.
Where Flowserve has supplied only the bare shaft
pump, the Ex rating applies only to the pump. The
party responsible for assembling the ATEX pump set
shall select the coupling, driver and any additional
equipment, with the necessary CE Certificate/
Declaration of Conformity establishing it is suitable for
the area in which it is to be installed.
The output from a variable frequency drive (VFD) can
cause additional heating effects in the motor and so,
for pumps sets with a VFD, the ATEX Certification for
the motor must state that it is covers the situation
where electrical supply is from the VFD. This
particular requirement still applies even if the VFD is
in a safe area.
1.6.4.2 Marking
An example of ATEX equipment marking is shown
below. The actual classification of the pump will be
engraved on the nameplate.
II 2 GD c IIC 135 ºC (T4)
Equipment Group
I = Mining
II = Non-mining
Category
2 or M2 = high level protection
3 = normal level of protection
Gas and/or dust
G = Gas
D = Dust
c = Constructional safety
(in accordance with EN13463-5)
Gas Group
IIA
– Propane (typical)
IIB
– Ethylene (typical)
IIC
– Hydrogen (typical)
Maximum surface temperature (Temperature Class)
(see section 1.6.4.3.)
1.6.4.3 Avoiding excessive surface
temperatures
ENSURE THE EQUIPMENT TEMPERATURE
CLASS IS SUITABLE FOR THE HAZARD ZONE
Pumps have a temperature class as stated in the
ATEX Ex rating on the nameplate. These are based
on a maximum ambient of 40 ºC (104 ºF); refer to
Flowserve for higher ambient temperatures.
The surface temperature on the pump is influenced
by the temperature of the liquid handled. The
maximum permissible liquid temperature depends on
the ATEX temperature class and must not exceed the
values in the table that follows.
Maximum permitted liquid temperature for pumps
Temperature class
to EN13463-1
Maximum surface
temperature permitted
Temperature limit of
liquid handled
T6
T5
T4
T3
T2
T1
85 °C (185 °F)
100 °C (212 °F)
135 °C (275 °F)
200 °C (392 °F)
300 °C (572 °F)
450 °C (842 °F)
65 °C (149 °F) *
80 °C (176 °F) *
115 °C (239 °F) *
180 °C (356 °F) *
275 °C (527 °F) *
400 °C (752 °F) *
* The table only takes the ATEX temperature class into consideration. Pump
design or material, as well as component design or material, may further
limit the maximum working temperature of the liquid.