DMX/DMXD/DMXH/DMXDH USER INSTRUCTIONS ENGLISH 71569282 - 10/09
Page 6 of 60
II 2 GD c IIB 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 prEN13463-5)
Gas Group (Equipment Group II only)
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 temperature of 40 °C
(104 °F); refer to Flowserve for higher ambient
temperatures.
The temperature of the liquid handled influences the
surface temperature on the pump. The maximum
permissible liquid temperature depends on the ATEX
temperature class and must not exceed the values in
the table that follows.
The temperature rise at the seals and bearings and
due to the minimum permitted flow rate is taken into
account in the temperatures stated.
Temperature
class to
prEN 13463-1
Maximum surface
temperature
permitted
Temperature limit of
liquid
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 responsibility for compliance with the
specified maximum liquid temperature is with the
plant operator.
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, the 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 and make routine vibration monitoring
checks.
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 totally 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, users shall fit an appropriate dry
run protection device (e.g. liquid detection or a power
monitor).
To avoid potential hazards from fugitive emissions of
vapor or gas to atmosphere the surrounding area
shall be well ventilated.
1.6.4.5
Preventing sparks
To prevent a potential hazard from mechanical
contact, the coupling guard must be non-sparking
and anti-static for Category 2.
To avoid the potential hazard from random induced
current generating a spark, the baseplate shall be
properly grounded.
Avoid electrostatic charge: do not rub non-metallic
