NIC Vacuum and Cooling Procedures

Current State of System

Date Updated System State Updated By
09/16/2019 Grant West
The state of the system is only to be updated by Grant West and Manny Montoya.

Changing the state involves physical work on the vacuum system on the LBTO. This area is to inform operators of any non-standard procedures that will augment normal procedures.

Non-Standard States

Whenever the system is put into a non-standard state, it should be documented in the below table. As states are removed they can be removed from the table and placed in the old state table at the end of the document.
Non-Standard State Purpose of State Effect on Operation Date Instated
Connection between SX turbo and V6 removed. Leak near SX turbo, unable to fully solve, disconnected turbo to keep a sealed system for now. Do not open V4. Use DX turbo only. ~08/13/2019
Bellow connecting from NIC up to switchyard intersection removed Possible cause of LMIRCAM noise. Removed for first run of the semester. Do not open V14. NIC can only be pumped down through the switchyard. 09/05/2019
Bellows reconnected. V14 closed, and V11 opened. Closed off NIC from mainline to allow us to pump on the UBC with the center turbo. Do not open V14. NIC can only be pumped down through the switchyard. 09/29/2020

State of Manual Valves

The manual valves shown on the vacuum page have no indication of their states at each valve. Inferences of the state of some valves can be made by looking at pressure sensors, but the below tables should be updated every time a change is made to manual valves. Additionally any non-standard states the pumping system is in should be recorded.
Manual Valve Valve Purpose State
V6 SX Scroll Pump Open
V9 Valve between left and right side Closed
V10 DX Scroll Pump Open
V11 Valve from centerline to UBC Closed
V12 Switchyard to centerline Closed
V14 NIC Main Valve Closed
Swagelok Valves Venting Valves All Closed
Refer to the lbti-web Vacuum Page for a full layout of the vacuum system, and number labels of all valves.

Reading lbti-web Vacuum Page

Access lbti-web:8080.

Select the Vacuum page from the Engineering tools drop down menu.

vacuumSelect.png

When viewing the vacuum page, you can see the status of all automated valves, pumps, temperatures, and pressures. The yellow and green lines represent the vacuum lines running through the system.

vacuumPage.png

Valves and pumps are detailed below.

Open and Closed Valves

Valve Closed Valve Open Valve
Gate Valve valveGateClosed.png valveGateOpen.png
Remote Valve valveRemoteClosed.png valveRemoteOpen.png
Manual Valve valveManual.png valveManual.png
Swagelok Venting Valve valveSwagelok.png valveSwagelok.png
Note that the manual and Swagelok valves cannot be controlled remotely and do not appear different depending on their status. These valves should be checked in person before pumping. (see Current State of System section.)

On and Off Pumps

Pump Pump Off Pump On
Scroll Pump pumpScrollOff.png pumpScrollOn.png
Turbo Pump pumpTurboOff.png pumpTurboOn.png
Cryomech Pump cryomechOff.png cryomechOn.png

Pump-Down Vacuum Procedure

Access lbti-web:8080.

Pumping Down NIC

  1. With NIC attached to the telescope ensure the following valves are manually opened/shut.
  2. Valve 11 and 12 should be closed off. Valve 14 should be open if NIC is to be pumped on.
  3. All remote valves should be closed. The gate valve between NIC and the switchyard should be closed as well. The states of the three gate valves V1, V2, and V3 do not matter as long as the gate valve between NIC and the switchyard is closed.
  4. Turn on the SX scroll pump and wait 1 min.
  5. Open V15. You should see the pressure drop within the vertical green vacuum line, as well as NIC.
  6. Continue pumping until NIC and the vertical green vacuum line are in the mTorr range.
  7. Close V15.
  8. Turn on the center turbo pump. Wait 3 min.
  9. Open V13. Pressure in the vertical green vacuum line and NIC should begin to drop.
  10. Continue pumping until NIC is in the E-5 Torr range.
  11. Close V13.
  12. Turn off all pumps.

Pumping Down the UBC and Switchyard

  1. Make sure the switch yard and UBC are at the same pressure.
  2. All remote valves should be closed, except for the gate valves V1, V2, and V3.
  3. Turn on SX and DX Scroll pumps and wait 1 min.
  4. Open V5 and V7.
  5. Pump down the UBC until the SX side, DX side, and switchyard are all in the mTorr range.
  6. Close V5 and V7.
  7. Turn on the SX and DX turbo pumps. Wait 3 min.
  8. Open V4 and V8.
  9. Pump down the UBC until the SX side, DX side, and switchyard are all in the E-5 Torr range.
  10. Close V4 and V8.
  11. Turn off all pumps.

Compressor Procedure

If both method 1 and 2 below do not turn the cryomech on, contact Grant West (520) 488-8071.

Access lbti-web:8080.

The compressor should only be turned on if the pump down procedure has been completed, and pressure in NIC is in the E-5 Torr range. If pressures are significantly higher, the compressor will not be able to handle the load and will shut off. Furthermore, the compressor needs a coolant flow of at least 2 gallons per minute to operate normally. This value is not accessible remotely but needs to be read from analog flow meters at the telescope.

Head to the vacuum page via Engineering Tools.

vacuumSelect.png

Use method 1 or 2 depending on whether there is a warning present in the cryomech GUI box.

Method 1: Turning on the Cryomech with No Warning Present

cryomechNoWarning.png

Ensure arm protection system is off by clicking the 'Off' button next to 'Arm Protection System.' If arm protection is on you will be unable to turn on the cryomech.

armProtectionOff.png

Turn on the cryomech.

cryomechTurnOn.png

If the UBC is cold, turn on 'Arm Protection System.'

armProtection.png

Method 2: Turning on the Cryomech with Red Warning in Cryomech GUI

cryomechWarning.png

Go to the ADAM page via Engineering Tools.

adamSelect.png

Locate the second set of 6 devices (the cryomech devices).

adamPage.png
  1. Set ‘Cryomech Interlock command’ toggle to 0 state.
  2. Set ‘Cryomech On-Off command’ toggle to 0 state.
  3. Set ‘Cryomech Interlock command’ toggle to 1 state.
  4. Set ‘Cryomech On-Off command’ toggle to 1 state.
This should turn cryomech on, clearing any warning state.

The ADAM page should like the following picture when running properly with no warning.

adamRunning.png

If the UBC is cold, turn on 'Arm Protection System.'

armProtection.png

If both method 1 and 2 above do not turn the cryomech on, contact Grant West (520) 488-8071.

Old Non-Standard States

Non-Standard State Purpose of State Effect on Operation Date Instated Date Removed
         
-- Grant West -- LbtiObserver - 16 Sep 2019
Topic attachments
I Attachment Action Size Date Who Comment
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valveSwagelok.pngpng valveSwagelok.png manage 525 bytes 16 Sep 2019 - 20:23 LbtiObserver  
Topic revision: r3 - 04 Dec 2020, LbtiObserver
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