Single Pass Cooler Cleaning Procedure - EBARA 80?25 Installation Operation & Maintenance

EBARA Multi-Stage Dry Vacuum Pumps
2. Remove the clamps from NW 40 and NW 25 connections on the end caps.
3. One at a time, remove each end cap by removing 8 mm bolts (8 stainless steel
bolts) with a 6 mm hex wrench.
CAUTION
!
If any of the bolts are seized, apply WD-40, Liquid Wrench, LPS, or other
penetrating product in liberal amounts while torquing the bolt back and forth.
This will usually loosen the bolt and prevent twisting off the bolt head.
4. Examine the cooler tubes to determine the approximate build-up by the amount
of process adhering to the walls of the tubes.
5. Write down the % amount of build-up in the coolers. (Photocopy and use the
Cooler Cleaning and Inspection Form).
Example: 30 - 40% build-up in the tube.
6. Examine the O-ring and replace it if necessary. (Ebara Part Description: G-90).
7. Replace the end cap being careful not to pinch or damage the O-ring. Replace
the centering O-ring if necessary.
8. Apply graphite anti-seize (Permatex 133A) to each of the bolts to prevent galling
or the transfer of metal.
9. Replace the stainless steel 8 mm bolts and tighten the bolts in an even criss-
cross pattern or until the end cap is seated firmly against the cooler body.
10. Replace the end caps, one at a time, before proceeding to the next one to
minimize the fumes and moist air from getting in and out of the pump.
Repeat the steps on each cooler for both sides. Document each side separately. (Each
cooler has a hot gas side, which is gas exiting the pump, and a cold gas side, where
gas exits the cooler).
Include all piping between the pump and coolers and exhaust piping from coolers,
including the check valve in the inspection.
11. Test the pump for leaks. (See "Leak-Checking the Pump".)
5.10.3

Single Pass Cooler Cleaning Procedure

DANGER
!
Respirators may be required when inspecting or cleaning coolers (Process
dependent).
WARNING
!
930601-P
Pump Maintenance
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