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Entry  Fri Jul 30 09:55:34 2010, steve, Configuration, VAC, slow pumpdown has started slowpd5hr.jpg
    Reply  Fri Jul 30 17:54:55 2010, steve, HowTo, VAC, How to stop and start slow pumpdown 
       Reply  Fri Jul 30 22:07:42 2010, Koji, HowTo, VAC, How to stop and start slow pumpdown 
          Reply  Sat Jul 31 10:12:05 2010, kiwamu, Update, VAC, Re: How to stop and start slow pumpdown 
             Reply  Sat Jul 31 14:59:33 2010, kiwamu, Update, VAC, Re: How to stop and start slow pumpdown 
    Reply  Mon Aug 2 10:26:15 2010, steve, Configuration, VAC, very slow pumpdown completed veryslowpd.jpg
Message ID: 3336     Entry time: Fri Jul 30 17:54:55 2010     In reply to: 3331     Reply to this: 3338
Author: steve 
Type: HowTo 
Category: VAC 
Subject: How to stop and start slow pumpdown 

Quote:

Bob and Steve closed BS chamber with the help of the manual Genie lift and the pump down started. The PSL shutter was closed and manual block was placed in the beam path. High voltage power supplies were checked to be off.

Pumping speed ~ 1 Torr/min was achieved at  1/8 of a turn opened roughing valve RV1

 We are at 370 Torr at 9 hrs of  pumping. RV1 is opened to ~ 3/8 turn orifice. We are using one roughing pump RP3  and butterfly valve is in place.

 

How to stop: 1, close RV1 by torque wheel  2, close V3 from MEDM screen  3, turn off RP3 roughing from MEDM screen  4, disconnect metal hose to oily pump

after butterfly valve. This KF-45 O-ring seal should be kept clean 5, place/close  45 mm cover blanks at the end of the hose and and on the 5" nipple.

 

How to start: 1, remove blanks from  hose and nipple 2, reconnect roughing pump hose to RV1 nipple  3, turn on PR3  4, open V3  5, open RV1 by wrench to ~3/8

6, fine tune RV1 opening to 1 Torr/min

 

ESSENTIAL: one operator has to be present when oilly roughing pump is connected to the vac. envelope

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