English (GB)
15
9. Before starting up and during
operation of an ATEX-approved
pump
9.1 Checklist
Observe this checklist:
1. Check that the ATEX rating of the motor, pump
and accessories corresponds to the specified
category. See section 6. Scope of ATEX
categories for CR pumps. If the motor, pump or
accessory categories differ, the lower rating is
valid.
2. If the pump falls under category M2, check that
the pump is protected by a guard to prevent
damage from falling or ejected objects.
3. Clean the cavities behind the pump's coupling
guard on a regular basis to avoid hazardous dust
deposits.
4. Check that the motor output power corresponds
to the required P
2
of the pump, see nameplates.
5. Check that the pump is as ordered, see
nameplates.
6. Check the axial alignment of the chamber stack.
See the label on the inside of the coupling guard.
Check that the shaft seal components, rubber
parts and seal surfaces are suitable for the
pumped liquid.
7. Check that the shaft can rotate freely. There must
be no mechanical contact between impeller and
chamber.
8. Check that the pump has been filled with liquid
and vented. The pump must never run dry.
9. Check the direction of rotation of the motor, see
the arrow on the top of the fan cover.
10. If you have chosen a pump with double seal,
back-to-back, check that the seal chamber is
pressurised. Always pressurise the chamber
during operation. Always use ATEX-approved
equipment.
11. If you have chosen a pump with double seal,
tandem, check that the seal chamber is
completely filled with liquid. The seal chamber
must always be filled with flushing liquid during
operation. The dry-running protection must be
ATEX-approved.
12. Follow the special startup procedures for these
pump types:
– MAGdrive pumps
– pumps with double seal, back-to-back
– pumps with double seal, tandem.
For further information, see the installation and
operating instructions for the pump in question.
13. Check that the liquid temperature never exceeds
the maximum liquid temperature, t
max
, stated on
the nameplate.
14. Avoid overheating of the pump.
Operation against a closed outlet valve may
cause overheating. Install a bypass with a
pressure relief non-return valve.
15. Check for abnormal noise during operation to
avoid overheating of the pump.
16. Re-vent the pump in either of these situations:
– the pump has been stopped for a period of
time.
– air has accumulated in the pump.
17. If the pump is with bearing bracket, check for
bearing noise every week. Replace the bearing if
it shows signs of wear.
18. The auto-ignition temperature of the pumped
liquid must be 50 K above the maximum surface
temperature of the pump.
19. Make sure to apply the correct inlet pressure.
Use the correct table for the vapour pressure for
the pumped liquid. See section
9.1.1 Specification and calculation of inlet
pressure.
DANGER
Explosion risk
Death or serious personal injury
- Do not run the pump at speeds
exceeding the rated speed. See pump
nameplate.
DANGER
Explosion risk
Death or serious personal injury
- Follow the checklist below.
