DURCO MARK 3 ISO FRAME MOUNTED ENGLISH 85392719 06-12
Page 8 of 52
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Additional requirements for self-priming
1.6.4.6
pumps only
Where the system operation does not ensure control of
priming, as defined in these User Instructions, and the
maximum permitted surface temperature of the T Class
could be exceeded, fit an external surface temperature
protection device.
Preventing the build-up of explosive
1.6.4.7
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, fit an appropriate dry run protection device
(for example liquid detection or a power monitor).
To avoid potential hazards from fugitive emissions of
vapour or gas to atmosphere the surrounding area
must be well ventilated.
Preventing sparks
1.6.4.8
To prevent a potential hazard from mechanical
contact, the coupling guard must be non-sparking.
To avoid the potential hazard from random induced
current generating a spark, the baseplate must be
properly grounded.
Avoid electrostatic charge: do not rub non-metallic
surfaces with a dry cloth
;
ensure cloth is damp.
For ATEX the coupling must be selected to comply
with 94/9/EC. Correct coupling alignment must be
maintained.
Additional requirement for metallic
1.6.4.9
pumps on non-metallic baseplates
When metallic components are fitted on a non-
metallic baseplate they must be individually earthed.
Preventing leakage
1.6.4.10
The pump must only be used to handle liquids
for which it has been approved to have the correct
corrosion resistance.
Avoid entrapment of liquid in the pump and associated
piping due to closing of suction and discharge valves,
which could cause dangerous excessive pressures to
occur if there is heat input to the liquid. This can occur if
the pump is stationary or running.
Bursting of liquid containing parts due to freezing
must be avoided by draining or protecting the pump
and ancillary systems.
Where there is the potential hazard of a loss of a seal
barrier fluid or external flush, the fluid must be
monitored.
If leakage of liquid to atmosphere can result in a
hazard, install a liquid detection device.
Maintenance to avoid the hazard
1.6.4.11
CORRECT MAINTENANCE IS REQUIRED TO
AVOID POTENTIAL HAZARDS WHICH GIVE A
RISK OF EXPLOSION
The responsibility for compliance with maintenance
instructions is with the plant operator.
To avoid potential explosion hazards during
maintenance, the tools, cleaning and painting
materials used must not give rise to sparking or
adversely affect the ambient conditions. Where there
is a risk from such tools or materials, maintenance
must be conducted in a safe area.
It is recommended that a maintenance plan and
schedule is adopted. (See section 6, Maintenance.)
Summary of Contents for Durco Mark 3
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