Flowserve QLQ Vertical Worthington - Manual (Page 7)

QLQ, QLQC USER INSTRUCTIONS ENGLISH 87900027 – 06/14
Page 7 of 61
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 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 liquid handled. The maximum permissible
liquid temperature depends on the ATEX temperature
class and must not exceed the values in the table that
follows.
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) 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 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 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.
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.
Where there is any risk of the pump being run against
a closed valve generating high liquid and casing
external surface temperatures, users shall fit an
external surface temperature protection device.
Avoid mechanical, hydraulic or electrical overload by
using motor overload trips, temperature monitor or a
power monitor. Make routine vibration
measurements. In dirty or dusty environments,
regular checks shall be made and dirt removed from
areas around close clearances, bearing housings and
motors.
1.6.4.4 Preventing the build up of explosive
mixtures
ENSURE THE PUMP IS PROPERLY FILLED
AND VENTED AND DOES NOT RUN DRY
Ensure the pump and relevant suction and discharge
pipeline system is completely filled with liquid at all
times during the pump 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.
If the operation of the system cannot avoid this
condition, user shall fit an appropriate dry run
protection device (eg. liquid detection or a power
monitor).
To avoid potential hazards from fugitive emissions of
vapor or gas to the atmosphere the surrounding area
shall be well ventilated.