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Cornell High Energy Synchrotron Source

Doc#: SOP-OPS-001

Procedure: Helium Supply Maintenance

Prepared by: ZB

Rev.: 3

Revision Date: 2/17/14

Date Effective:02/17/14

Date Expires: 02/17/15

Approved by: DJJ
To replace an empty Helium crib with a fresh backup to provide a continuous Helium supply to CHESS areas.

Materials and Equipment Needed
  • New High-Purity Helium 12-pack
  • Pallet Jack
  • 1-1/8” Wrench
  • Broom
  • Leak Checking Liquid
  • Scrap Paper
  • Marker
  • Scotch Tape
  • Hazards – Pressurized gas.
  • Safety Equipment Required: none
  • Acknowledge alarm at ops.
  • Walk to He Supply station in L0E and verify that the MAIN tank capacity is low with the in-line Pressure gauge on the wall panel.
  • Determine which He crib is on Main (A/B). If the selector handle in the center of the wall panel is horizontal, A is on MAIN and B is on BACKUP. If the handle is vertical, B is on MAIN and A is on BACKUP. (Fig. 1)
  • Close all twelve valves on the cylinders in the crib.
  • Close the main output valve located in the top-center of the MAIN crib. (Fig. 2)
  • Close the MAIN LINE VALVE located above the wall panel. (Fig. 3)
  • Close the intermediate valve on the wall-panel from the MAIN crib. (Fig. 4)
  • Loosen and remove the nipple from the crib’s main valve and hang the hose on the holder marked CGA-580 HOLDER next to the MAIN LINE VALVE using the 1-1/8” wrench.
  • Move the empty crib away from the supply station to a temporary location using the pallet jack,.
  • Sweep the area where crib was located.
  • Move the spare crib (right-most looking at the supply station) into the empty bay with the main valve aligned with the wall panel using the pallet jack.
  • Mark that the He crib is empty on the paper, with operator initials and date using the marker and scrap paper.
    • Tape the sign to the empty crib.
  • Move the empty crib into the bay where the spare previously sat with the EMPTY sign facing outwards.
  • Remove shrink-wrap from the new crib’s main valve.
  • Remove the CGA-580 nipple and hose from the wall holder and connect the hose to the new He crib’s main valve.
  • Tighten the nut using the 1-1/8” wrench.
  • Open all twelve (12) valves on the Helium cylinders.
  • Open the main valve of the Helium crib SLOWLY.
  • Open the intermediate valve between the wall panel and the crib.
  • SLOWLY open the Main Purge Vent dial and bleed the line for 30 seconds. (Fig. 3)
  • Close the Main Purge Vent.
  • Open the MAIN LINE VALVE.
  • Switch the new tank to BACKUP:
    • Turn the handle on the wall-panel 90 degrees such that the pointed side of the handle is pointing towards the appropriate MAIN/BACKUP label.
  • Leak-check the new crib’s main valve:
    • Spray Leak Checking Liquid between the nut and the valve.
      • If the liquid bubbles out of the threading there is a leak, and the valve needs to be tightened more.
      • If there are no bubbles, the seal is good.
  • Reset the Gas Monitor in Ops.
  • Make a Web-board note; noting the time and date of the alarm and which letter crib is on MAIN and which is on BACKUP.
  • Order new Helium 12 pack. Ref SOP-OPS-013


Fig. 1 - (A on MAIN, B on BACKUP; A-line closed)


Fig. 2 - He Crib Main Valve and CGA-580 Nipple


Fig. 3 – Line Valve, Vent and Nipple Holder

Line Valve is Closed


Fig. 4 – Intermediate Vavle (closed).


  • CHESS SOP-OPS-013, “Purchasing a helium crib”
Revision History
Rev. 0 – Initial Document (9/24/10)
Rev. 1 – Update to newer standards. Misc. edits. (06/15/11)
Rev. 2 – Moved step 7 to step 4. Swapped steps 6 and 7. Added step 10. Reworded steps 11, 12. (06/21/11)
Rev. 3 - Added reference for SOP-OPS-013. Updated header to new format (KM 2/17/14)
Topic revision: r1 - 29 Aug 2017, ljs30
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