Flowserve ATEX E - Manual (Page 4)

ATEX- E/F/D/N - 11-09
Page 4 of 20 flowserve.com
The output from a variable frequency drive (VFD) can
cause additional heating affects in the motor and so, for
pump sets with a VFD, the ATEX Certification for the
motor must state that it covers the situation where
electrical supply is from the VFD. This is particular
requirement still applies even if the VFD is in a safe area.
2.4 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 (Equipment Category 2 only)
IIA – Propane (typical)
IIB – Ethylene (typical)
IIC – Hydrogen (typical)
Maximum surface temperature (Temperature Class)
(see section 2.5)
2.5 Avoiding excessive surface
temperatures
ENSURE THE EQUIPMENT TEMPERATURE
CLASS IS SUITABLE FOR THE HAZARD ZONE
2.5.1 Pump liquid temperature
Pumps have a temperature class as stated in the
ATEX Ex rating on the nameplate. These are based
on a maximum ambient of 40 °C (104 °F); 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
temperature class and must not exceed the values in the
table applicable below.
The temperature rise at the seals and bearings and due
to the minimum permitted flow rate is taken into account
in the temperatures stated.
Maximum permitted liquid temperature for pumps
which do not have a magnetic drive or self-
priming casing:
Temperature
class to
EN13463-1
Maximum
surface
temperature
permitted
Temperature limit of liquid
handled (* depending on
material and construction
variant - check which is lower)
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)
Consult Flowserve
Consult Flowserve
115 °C (239 °F) *
180 °C (356 °F) *
275 °C (527 °F) *
400 °C (752 °F) *
Maximum permitted liquid temperature for pumps
with magnetic drive or self priming casing:
Temperature
class to
EN13463-1
Maximum
surface
temperature
permitted
Temperature limit of liquid
handled (* depending on
material and construction
variant - check which is lower)
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)
Consult Flowserve
Consult Flowserve
110 °C (230 °F) *
175 °C (347 °F) *
270 °C (518 °F) *
350 °C (662 °F) *
The responsibility for compliance with the
specified maximum liquid temperature is with the
plant operator.
Temperature classification “Tx” is used when the
liquid temperature varies and when the pump is
required to be used in differently classified potentially
explosive atmospheres. In this case the user is
responsible for ensuring that the pump surface
temperature does not exceed that permitted in its
actual installed location.
2.5.2 Pumps with key driven impellers
If an explosive atmosphere exists during the
installation, do not attempt to check the direction of
rotation by starting the pump unfilled. Even a short
run time may give a high temperature resulting from
contact between rotating and stationary components.
2.5.3 Pumps with threaded on impellers
Do not attempt to check the direction of rotation with
the coupling element/pins fitted due to the risk of
severe contact between rotating and stationary
components.
2.5.4 Pumps with mechanical seal
Where there is any risk of the pump being run against a
closed valve generating high liquid and casing external
surface temperatures it is recommended that users fit an
external surface temperature protection device.
Avoid mechanical, hydraulic or electrical overload by
using motor overload trips or a power monitor and
make routine vibration monitoring.