Temperature Class; Before Starting Up And During Operation Of An Atex-Approved Pump; Check List; Maintenance And Inspection - Grundfos CR Serie Instrucciones De Instalación Y Funcionamiento

9.2.1 Temperature class

Temperature
Maximum surface temperature [°C]
class
T1
T2 T3
T4
T5
T6
9.2.2 Shaft seal temperature
In order to calculate the pump surface temperature and
temperature class, the below table shows the temperature rise in
the shaft seal for different shaft diameters, different pressure and
various media class.
Shaft seal: HQQX/HUUX
Rpm: 2900/3500
Media class 1
Pressure
Diameter
[mm]
1 Mpa 2.5 Mpa 1 Mpa 2.5 Mpa 1 Mpa 2.5 Mpa
Shaft seal temperature rise [°C]
12 9 16
15 10 17
22 11 19
26/32 13 22
Shaft seal: HQBX/HUBX
Rpm: 2900/3500
Media class 1
Pressure
Diameter
[mm]
1 Mpa 2.5 Mpa 1 Mpa 2.5 Mpa 1 Mpa 2.5 Mpa
Shaft seal temperature rise [°C]
12 12 21
15 14 23
22 15 25
26/32 17 29
Media class 1: Water, and water-like media.
Media class 2: Other media with a limited leak to the atmosphere.
Media class 3: Oils.
Do not operate the pump at temperatures exceeding
Caution
those specified in section
10. Before starting up and during operation of an
ATEX-approved pump

10.1 Check list

Observe this check list:
1. Check that the ATEX rating of both motor and pump
corresponds to the specified category.
See section 7. Scope of ATEX categories for CR
If the motor and pump 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. Check that the motor output power corresponds to the
required P of the pump, see nameplates.
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4. Check that the rubber parts of the pump are as ordered,
see nameplates.
5. Check the alignment of the chamber stack.
6. See the label on the inside of the coupling guard.
450
300 200
135
100
85
Media class 2 Media class 3
Pressure Pressure
9 19 13 22
10 20 14 24
11 23 15 27
13 26 17 30
Media class 2 Media class 3
Pressure Pressure
12 25 17 29
14 27 18 32
15 30 20 35
17 34 23 40
9. Operating conditions.
pumps.
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
14. Avoid overheating of the pump.
Operation against a closed discharge valve may cause
overheating. Install a bypass with a pressure-relief non-return
valve.
15. 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.
16. If the pumps is with bearing bracket, check for bearing noise
every week. Replace the bearing if it show signs of wear.

11. Maintenance and inspection

Service documentation is available in Grundfos Product Center
(http://product-selection.grundfos.com/).
If you have any questions, please contact the nearest Grundfos
company or service workshop.

11.1 Tightening torques of the coupling

Warning
These instructions must be observed for explosion-
proof pumps. We recommend that you also follow
these instructions for standard pumps.
Pump size
CR, CRI, CRN 1s, 1, 3
CR, CRI, CRN 10, 15, 20
CR, CRI, CRN 32, 45, 64, 90 M10 - 85 Nm
CR, CRI, CRN 120, 150
stated on the nameplate.
max,
Tightening torque
M6 - 13 Nm
M8 - 31 Nm
M10 - 61 Nm
M6 - 13 Nm
M8 - 31 Nm
M10 - 62 Nm
M10 - 85 Nm
M16 - 100 Nm
Subject to alterations.
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