AD 015 0013 ODI Dewar Removal and Installation › ets › Mechanical › Procedures ›...

Doc #: 3500-AD-015-0013 Revision: -

ODI Dewar Removal and Installation

Author(s): Wilson Liu, Rob Christensen, Emily Hunting, Miranda Saucedo, Tammie Lavoie

ODI Dewar Removal And Installation

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Contents Revision History .............................................................................................................................. 3

1.0 Purpose ................................................................................................................................ 4

2.0 Applicable To ........................................................................................................................ 4

3.0 Scope .................................................................................................................................... 4

4.0 Definitions ............................................................................................................................ 4

5.0 Training ................................................................................................................................ 4

6.0 Safety ................................................................................................................................... 4

7.0 Personnel, Equipment and Material Required .................................................................... 5

8.0 Procedure ............................................................................................................................. 5

8.1 ODI Dewar Removal .............................................................................................................. 6

8.2 ODI Dewar Installation ........................................................................................................ 13

9.0 Procedure Review .............................................................................................................. 13

10.0 Records .............................................................................................................................. 14

11.0 References ......................................................................................................................... 14


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Revision History

Rev

Date Approved

Sections Affected

Reason for Change

Remarks and/or Change Details

Name

-- 7/24/17 Initial Release E. Hunting

T. Lavoie

Approved by:

Emily Hunting

Name, ME Title

SigEM

Name, EL Maint

SigSci

Name, SciOps

Tammie Lavoie 25 July 2017 Tammie Lavoie, Safety Manager Date


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1.0 Purpose

The intent of this procedure is to safely guide all applicable personnel through the removal

and installation of the ODI dewar.

2.0 Applicable To

This procedure is applicable to the Facilities, EM, and Engineering departments, or any

additional personnel who will assist in completing these tasks for the WIYN Telescope.

3.0 Scope

This document is a step by step procedure that outlines how to complete the ODI dewar

removal and installation.

4.0 Definitions

The acronyms referenced in this procedure are listed below.

ODI

One Degree Imager

SES

Servo Electronics Subsystem

5.0 Training

The trainings required for this procedure are as follows:

1. Lockout/Tagout

2. Overhead Crane Operations

6.0 Safety

The safety documents required for this procedure are as follows:

1. Daily Briefing Form

2. JHA Form


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7.0 Personnel, Equipment and Material Required

Process # of Personnel Notes

8.1 ODI Dewar Removal 5

8.2 ODI Dewar Installation 5

8.0 Procedure

The following processes must be completed before the ODI dewar removal can begin.

1. Decable the dewar “hexpanel”: fibers, helium, glycol, and power cables.

2. Position the telescope so ODI is over the scissor lift, azimuth position of ~1 degree.

Engage the telescope brakes.

3. Rotate ODI (WIYN port) to 0 degrees.

4. Switch the dome to the ‘Maintenance’ position. Note: This is located on the B-Level in

the back of racks SES.

5. Tagout the instrument rotator. Note: Use the button on the telescope that looks like an

E-Stop and push it in. There is only one key to release the lock. Refer to the

Lockout/Tagout Standard Operating Policy (1000-AD-015-0001) (JHA-1).

Equipment/Part/Tool List Location Notes

ODI Dewar Lifting Fixture WIYN Alcove

ODI Dewar Cart 0.9m Garage Bring to WIYN early


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After completing the above, the remaining processes are as follows.

8.1 ODI Dewar Removal

1. Place the eyebolt in its position on the hatch (Figure 1).

Figure 1: Lifting Straps and Eyebolt

Lifting Straps

Eyebolt

2. Attach two, 8’, gray lifting straps to the 5 ton crane (Figure 1) (JHA-2). Note: Both straps

are equal in length.

3. Attach one, 3’, purple choker strap to the 5 ton crane (Figure 2) (JHA-3). Note: Use a

come-along to put tension on the hatches and stabilize them as they are being lifted.

Figure 2: 3’, Purple Choker Strap

Strap


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4. Use the 5 ton crane to lift the hatch covers off one at a time (Figures 3 and 4) (JHA-4).

Figure 3: 5 Ton Crane Figure 4: Hatch Cover Being Lifted

5. In a clear area, lower the first hatch cover to the floor completely (Figure 5) (JHA-5).

Remove the straps from the hatch, but leave them attached to the crane.

Figure 5: First Hatch Cover Being Lowered

6. Repeat step five for the other hatch cover (Figure 6) (JHA-6). Note: Stack the second

hatch cover on top of the first one.

Figure 6: Second Hatch Cover Being Lowered

7. Install all four of the safety rails into their correct floor slots (JHA-7).

8. Roll the 5 ton crane all the way down to the 1st floor (JHA-8).


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9. Place four, 12’ straps on the ODI dewar cart and attach the straps to the crane hook

(Figure 7) (JHA-9). Note: All four straps are equal in length. Install and use a tagline to

stop the cart from swinging.

Figure 7: Attaching Straps to Dewar Cart

10. Carefully lift the cart from the Main Floor to the Telescope Floor (Figures 8 and 9) (JHA-

10).

Figure 8: Lifting the Dewar Cart Figure 9: Dewar Cart on Telescope Floor

11. Unlock the lift and bring the portable stairs over to the lift.

12. Secure, or put away, any cables that are not needed to ensure they do not get caught on

anything.

13. Raise the 5 ton crane all the way up, and ensure it does not encounter the 2 ton crane as

the Dome is being rotated.

14. Bring the yellow ladder over to the instrument and secure it.

15. Use the ladder to unhook cables from the gold stargrasp box to prevent interference

with the lifting fixture (Figure 10) (JHA-11).


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Figure 10: Unhooking Cables with Ladder

16. Repeat step fifteen for the opposite side of ODI (JHA-12).

17. Disconnect the filter and shutter cables that are in between ODI and the dry air cables

(Figures 11 and 12) (JHA-13). Note: There are nine filters, or three cables in total, for

each section. These cables include one shutter cable and two dry air hoses.

Figure 11: Disconnect Cables Figure 12: Disconnect Cables

18. Place the scale on the 2 ton crane (Figures 13 and 14) (JHA-14). Note: Before everything

gets unbolted, the weight must be determined to ensure that it does not bend anything

with the screws. The total weight is 1,100 lbs. and the weight must hang off of the crane

instead of the screws.


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Figure 13: Scale on the 2 Ton Crane Figure 14: Picture of the Weight

19. Use the 3’, purple strap to connect the lifting fixture to the crane (JHA-15).

20. Carefully use the lift to elevate two workers high enough to install the lifting fixture

(Figures 15 and 16) (JHA-16). Note: The yellow lifting fixture goes behind the blue

brackets on ODI when looking at the telescope. It is critical that the crane is straight.

Figure 15: Lift Used to Elevate Workers Figure 16: Lifting Fixture

21. Remove the bolts from the dewar section (JHA-17). Note: There are eighteen bolts total;

three corners with six bolts in each corner.

22. Trolley out the dewar section, plus ODI. Note: The weight is 1,162 lbs.


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23. Install the covers (Figure 17).

Figure 17: The Covers (Yellow)

24. Carefully lower the lift (JHA-18).

25. Remove both of the ladders and store them appropriately.

26. Rotate the Telescope Dome to bring the dewar to the cart.

27. Slowly trolley the instrument to the back of the cart.

28. Insert the eighteen bolts into their proper locations (JHA-19).

29. Loosen the six bolts on the bottom positioning pins to put the instrument on (Figure 18).

Figure 18: Six Bolts


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30. Tighten the bolts on the back of the cart (Figures 19 and 20).

Figure 19: Bolts on Back of Cart Figure 20: Bolts on Back of Cart

31. Remove the scale and turn it off (JHA-20).

32. Stow the 2 ton crane.

33. Use the 5 ton crane to lower the instrument down to the B-Level (Figure 21) (JHA-21).

Note: When lowering the instrument, use the tagline to keep the load centered and clear

of any wires that may be in the way.

Figure 21: Lower Instrument to B-Level

34. Remove all four of the safety rails and store them appropriately (JHA-22).

35. Attach the lifting straps to the 5 ton crane and the top hatch (JHA-23).


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36. Slowly lift and maneuver the hatch to its correct location (Figure 22) (JHA-24).

Figure 22: Hatches in Place

37. Repeat step thirty five for the other hatch cover (JHA-25).

38. Disconnect all of the straps from the crane and put the floor hatch cover plates back on

(JHA-26).

39. Stow the 5 ton crane.

8.2 ODI Dewar Installation

1. Complete the “ODI Dewar Removal” procedures in reverse order. The dewar attachment

bolts should be torqued to 44 ft-lbs.

9.0 Procedure Review

This procedure must be reviewed by employees under the following terms:

1. Initially

2. When there is a change in the job process(es)

3. When there is a change in a worker’s status, or job title

4. When governing authorities (such as OSHA) make changes

5. Every three years, at a minimum


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10.0 Records

The records that must be kept by the supervisor are listed below. Training records must be

kept on file for a minimum of five years.

1. Personnel training records for:

Lockout/Tagout

Overhead Crane Operation

11.0 References

Document Number Document Title

1000-AD-015-0001 Lockout/Tagout Standard Operating Policy

3500-AD-015-0013-JHA ODI Dewar Removal and Installation JHA

AD 015 0013 ODI Dewar Removal and Installation › ets › Mechanical › Procedures ›...

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