Flowserve ESP3 - Manual (Page 6)

ESP3 USER INSTRUCTIONS ENGLISH 26999943 08-11
Page 6 of 64
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 135ºC (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
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 temperature 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 applicable below.
Maximum permitted liquid temperature for pumps
Temperature
class to
EN 13463-1
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) *
* 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 temperature rise at the seals and bearings and due
to the minimum permitted flow rate is taken into account
in the temperatures stated.
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 the pump could be
installed in different hazardous atmospheres. In this
case the user is responsible for ensuring that the
pump surface temperature does not exceed that
permitted in the particular hazardous atmosphere.
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.
Where there is any risk of the pump being run against a
closed valve generating high liquid, casing and
discharge pipe external surface temperatures, fit an
external surface temperature protection device.
Avoid mechanical, hydraulic or electrical overload by
using motor overload trips, temperature monitor or a
power monitor and perform routine vibration monitoring.
In dirty or dusty environments, make regular checks
and remove dirt from areas around close clearances,
bearing housings and motors.
1.6.4.4 Preventing the buildup of explosive
mixtures
ENSURE PUMP IS PROPERLY FILLED AND
VENTED AND DOES NOT RUN DRY
Ensure that the pump and relevant suction and discharge
piping is totally filled with liquid at all times during the
pumps operation so that an explosive atmosphere is
prevented. In addition, it is essential to make sure that
seal chambers, auxiliary shaft seal systems and any
heating and cooling systems are properly filled.