Ignition Protection (H) - VERDER VERDERFLEX Dura D7 Instruction Manual

4.4 Ignition Protection (h)

In environments with an explosive atmosphere, ignition protection categories serve to prevent ignition by not reaching high
temperatures. The ignition protection categories are distinguished according to the type and function of the equipment and the
probability an explosive atmosphere will occur.
The ignition hazard assessment identifies sources of ignition and these can then be dealt with in turn, through compliance
with EN ISO 80079, (g refer to "Ignition Hazard Assessment" document provided as part of the ATEX pack for full details of
compliance).
Ignition Hazard
Description / Basic Cause
Potential
(which causes originate
Ignition
which ignition
Source
– Losses dissipate into heat.
– Over speed
– Excess pressure - discharge
– Operating outside of speci-
fied environmental condi-
tions
– Bearing wear
Hot Surface
– Excess pressure - suction
– Low/ poor lubricant
– Seal failure leading to bear-
ing wear from lubricant loss
– Swelling of hose in the pres-
ence of particular solvents
Mechanical – External impact, mechanical
Sparks failure
Flames, Hot
Gases
Table 9 Ignition Protection (continued)
ATEX Instruction Manual
Dura 05-55
Measures Applied to Prevent the Ignition Source Becoming Effec-
tive
Reason for
Assessment
hazard)
The pump has
a maximum
temperature
during normal
operational
conditions.
Exceeding oper-
ating tempera-
ture.
Exceeding oper-
ating tempera-
ture.
Exceeding oper-
ating
temperature.
Premature hose
failure.
May cause over
temperature
Potential impact
from other
source, falling
object, been
struck by mov-
ing object.
Version 1.0v-07/2019
Description of the Measure
Applied
u Maximum temperature
achieved during testing.
u HP rotor and maximum rated
pressure applied.
u Test results recorded .
u Limitations on medium tem-
perature and Maximum permit-
ted pump speed.
u Comply with specifications.
u Bearing life far in excess of the
design parameters.
u Maintenance procedure to
check.
u Maintenance and installation
instructions.
u Requirement to use motor
overload relay.
u Motor supplied with PTCs.
u Factor of safety on surface
temperature limit allows for
substantial temperature rise.
u The manufacture's instruc-
tions list of solvents which are
known to be compatible.
u Requirement to use motor
protection relay.
u Motors supplied with PTCs.
u Material of manufacture is cast
iron having less than 125J
impact energy
u No flaming parts
Basis Citation of
Standard
Technical Rules
EN 80079-36:2016 6.2
EN 80079-36:2016 8.2
EN 80079-36:2016 10
EN 80079-36:2016 10
EN 80079-37:2016 5
EN 80079-36:2016 10
EN 80079-37:2016 5
EN 80079-36:2016 10
EN 80079-37:2016 5
EN 80079-37:2016 6
EN 80079-36:2016 10
EN 80079-36:2016
6.4.2.2
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