EBARA 80?25 Installation Operation & Maintenance page 41

EBARA Multi-Stage Dry Vacuum Pumps
Wear protective gloves when performing maintenance on the coolers.
WARNING
!
Protective eyeware should be worn when inspecting or cleaning coolers.
WARNING
!
Allow the pump package to cool before attempting any maintenance. Wear
protective gloves when performing maintenance on the coolers.
This cooler cleaning procedure requires at least 6 hours of down-time to complete. If a
spare set of coolers is available, the required down-time is reduced to 2-3 hours.
1. Turn off the pump and allow cooling water and Nitrogen to run approximately 15
minutes. This is to cool down the coolers, and to dilute any process gas that
may still be trapped in the pump.
2. Mark the cooler bodies and end caps designating third, fourth, or fifth with an
indelible ink pen.
3. After 15 minutes, turn off the Nitrogen. If removing the plumbing, disconnect the
Nitrogen (swage lock) lines. (You will need a 9/16" wrench).
4. Remove the clamps on all NW 40 and NW 25 connections.
5. Remove U-bolts around the cooler bodies. (You will need a 13 mm wrench).
6. Shut off the cooling water supply. Open the two swage lock connections using a
11/16" wrench and drain the water out of the pump and coolers. Nitrogen can be
used to aide in draining the water. (You will need a large, flat tray or pan).
7. Disconnect the remaining water lines and remove the coolers.
CAUTION
!
If possible, cap all disconnected lines to help prevent any contamination.
DANGER
!
Do not remove the end caps. The remaining water inside the coolers will cause
fumes if it comes in contact with process build-up.
930601-P
Pump Maintenance
33