Flowserve CPXS - Manual (Page 7)

CPXS, CPXNS and CPXPS USER INSTRUCTIONS ENGLISH 71569250 07-11
Page 7 of 48 flowserve.com
Where Flowserve has supplied only the bare shaft
pump, the Ex rating applies only to the pump. The party
responsible for assembling the ATEX 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. On
pumps sets controlled by 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 temperature class and must not exceed the
values in the table that follows.
The temperature rise at the bearings and due to the
minimum permitted flow rate is taken into account in
the temperatures stated.
Temperature class
to EN13463-1
Maximum surface
temperature permitted
Temperature limit of
liquid handled
T6
T5
T4
T3
T2 85 °C (185 °F)
100 °C (212 °F)
135 °C (275 °F)
200 °C (392 °F)
300 °C (572 °F)
Consult Flowserve
Consult Flowserve
115 °C (239 °F) *
180 °C (356 °F) *
275 °C (527 °F) *
Maximum permitted liquid temperature for
pumps with self priming casing
Temperature class
to EN13463-1
Maximum surface
temperature permitted
Temperature limit of
liquid handled
T6
T5
T4
T3
T2 85 °C (185 °F)
100 °C(212 °F)
135 °C (275 °F)
200 °C (392 °F)
300 °C (572 °F)
Consult Flowserve
Consult Flowserve
110 °C (230 °F) *
175 °C (347 °F) *
270 °C (518 °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.
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.
Avoid mechanical, hydraulic or electrical overload by
using motor overload trips, temperature monitors or
a power monitor and make routine vibration
monitoring checks.
In dirty or dusty environments, make regular checks
and remove dirt from areas around close
clearances, bearing housings and motors.
Where there is any risk of the pump being run against
a closed valve generating high liquid and casing
external surface temperatures fit an external surface
temperature protection device.
Do not attempt to check the direction of rotation with
the coupling spacer fitted due to the risk of severe
contact between rotating and stationary components.