Instruction manual

5.9 Clean the inlet-stage sump
Clean the inlet-stage sump regularly if you use the DP180 to pump dusty or tarry vapours. Use
the following procedure:
1. Remove the two screws on the clamp which secures the inlet-stage sump blanking-plate to
the pump (see Figure 10).
2. Remove the clamp, the blanking-plate and the sealing 'O' ring. Dispose of the 'O' ring.
3. Use a suitable tool (for example, a flexible handled, large diameter bottle-brush) to clean the
sump. Do not use your fingers for this operation.
4. Use a suitable cleaning solution to clean the blanking-plate. Make sure that all traces of the
cleaning solution are removed before you refit the plate.
5. Apply a light wipe of high vacuum grease to the new 'O' ring. Refit the 'O' ring and
blanking-plate to the pump, then use the clamp and the two fixing-screws to secure the
blanking plate in place.
5.10 Clean the cooling-jacket
Flush the cooling-jacket to clean it; that is allow water to flow rapidly through the cooling-jacket
in the reverse direction of normal flow. Use the following procedure.
1. Turn off the cooling-water supply.
2. Refer to Figure 10. Place a suitable container under the pump-body cooling-water inlet
connection (8) and undo the connection. Allow the water to drain out of the pump.
3. Disconnect the water return hose from the cooling-water outlet (2).
4. Connect the cleaning water supply to the pump cooling-water outlet (2).
5. Place a suitable container under the pump-body cooling-water inlet or connect a return hose
to the pump-body tapping.
6. Turn on the cleaning water supply. The pressure and flow rate of the supply should be equal
to or higher than the normal cooling-water pressure and flow rate. Do not exceed the figures
stated in Section 2.
7. Allow the water to flow for a few minutes, then turn off the cleaning water supply.
8. Disconnect the cleaning water supply hose (and the return hose, if fitted). Allow the water to
drain out of the pump.
9. Use a suitable tool to probe the pump-body cooling-water outlet and the cooling-water inlet
and remove any remaining sediment.
10. Refit the pump-body cooling-water inlet connection to the pump-body.
11. Connect the normal cooling-water supply and return hoses to the cooling-water inlet and
outlet connections (refer to Section 3.6.2).
12. Prime the pump as described in Section 3.12.2.
DP180 Dry Vacuum Pump 27