ATEX Instruction Manual
Dura 05-55
Version 1.0v-07/2019
9 | Page
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
Measures Applied to Prevent the Ignition Source Becoming Effec
-
tive
Potential
Ignition
Source
Description / Basic Cause
(which causes originate
which ignition
hazard)
Reason for
Assessment
Description of the Measure
Applied
Basis Citation of
Standard
Technical Rules
Hot Surface
–
Losses dissipate into heat.
The pump has
a maximum
temperature
during normal
operational
conditions.
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.
EN 80079-36:2016 6.2
EN 80079-36:2016 8.2
EN 80079-36:2016 10
– Over speed
–
Excess pressure - discharge
– Operating outside of speci-
fied environmental condi
-
tions
Exceeding oper
-
ating tempera-
ture.
u
Comply with specifications.
EN 80079-36:2016 10
EN 80079-37:2016 5
–
Bearing wear
Exceeding oper
-
ating tempera-
ture.
u
Bearing life far in excess of the
design parameters.
u
Maintenance procedure to
check.
EN 80079-36:2016 10
EN 80079-37:2016 5
–
Excess pressure - suction
–
Low/ poor lubricant
– Seal failure leading to bear-
ing wear from lubricant loss
Exceeding oper
-
ating
temperature.
Premature hose
failure.
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.
EN 80079-36:2016 10
EN 80079-37:2016 5
EN 80079-37:2016 6
– Swelling of hose in the pres-
ence of particular solvents
May cause over
temperature
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.
EN 80079-36:2016 10
Mechanical
Sparks
–
External impact, mechanical
failure
Potential impact
from other
source, falling
object, been
struck by mov
-
ing object.
u
Material of manufacture is cast
iron having less than 125J
impact energy
EN 80079-36:2016
6.4.2.2
Flames, Hot
Gases
u
No flaming parts
Table 9 Ignition Protection (continued)
