Removal of FFT Spectrograph Support Pedestals and 500 lb ...Removal Of FFT Spectrograph Support...

Doc #: 2100-AD-015-0051 Revision: -

Removal of FFT Spectrograph Support Pedestals and 500 lb Crane from 4m Coude Room

Author(s): mevatt

Removal Of FFT Spectrograph Support Pedestals And 500 Lb Crane From 4m Coudé Room

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

1. Purpose .................................................................................................................................... 4

2. Applicable To ........................................................................................................................... 4

3. Scope ....................................................................................................................................... 4

4. Definitions ................................................................................................................................ 4

5. Training .................................................................................................................................... 4

6. Safety ....................................................................................................................................... 4

7. Personnel, Equipment and Materials Required ...................................................................... 4

8. Procedure – South Pedestal Point A ........................................................................................ 5

9. Procedure Review .................................................................................................................. 16

10. Records .............................................................................................................................. 16

11. References ......................................................................................................................... 16


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Revision History

Rev

Date Approved

Sections Affected

Reason for Change

Remarks and/or Change Details

Name

- 11/14/2016 Initiated Evatt

Approved by:

SigEng

Name, ME Title

SigEM

Name, EL Maint

SigSci

Name, SciOps

Tammie Lavoie 17 February 2017 Tammie Lavoie, Safety Manager Date


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1. Purpose

The purpose of this document is to specify how the two pedestals originally installed to support the FFT Spectrograph Bench in the 4m Coudé room are to be removed. This document also includes instruction about how to remove the 500 lbf crane currently sitting on the Northern pedestal.

2. Applicable To

4m, DESI

3. Scope

This document covers the removal of pedestals in 4m Coudé room, removal of 500 lbf crane from northernmost pedestal, and the installation of cover plates over the holes left in the floor.

4. Definitions

LCR – Large Coudé Room

5. Training

Personnel performing this task will variously need to be proficient in: 1. Operating a forklift

2. Using a cutting torch

3. Using standard hand and power tools

6. Safety

1. JHA Form

2. Daily Briefing Form

7. Personnel, Equipment and Materials Required

1. Personnel:

This task will take three people dedicated to the job to perform safely, and a four person

during some parts of the process (lifting the crane, lifting the pedestals).

2. Equipment:

2.1. Forklift

2.2. Cutting torch

2.3. 2 EA x 4 foot lifting slings, shackles, and other rigging supplies capable of lifting about

1500 lbs


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2.4. 2 EA 1-8” lifting eyes (such as McMaster Carr part number 3013T55 Steel Eyebolt

without Shoulder, 1”-8 Thread Size, 2-1/2 Thread Length)

2.5. 2 EA heavy tag lines to control the pedestals as they are cut off and lifted out of their

holes in the floor.

2.6. Various standard hand tools including sockets, drives, and wrenches.

2.7. An acetylene torch with gas bottles.

2.8. An arc welding machine set up to weld carbon steel.

2.9. A few 4” x 4” wood pieces to set the crane and the pedestals on as they are removed.

3. Materials

3.1. Precut steel plates for use in covering the holes that will be left when the pedestals

have been removed.

8. Procedure – South Pedestal Point A

Background and Summary

There are two steel pedestals located in the Mayall Large Coudé Room (LCR). One of the

pedestals is at the south end of the LCR and the other is at the north end of the LCR. The north

pedestal has a 500 lbf jib crane mounted on it. On drawing 2100-SOM5947-S-E-19, the south

pedestal is called Point A and the north pedestal is called Point B. Refer to Figure 1 to see this

naming convention.

These two steel pedestals need to be removed from the LCR in order to make room for the

DESI Spectrograph Enclosure, to allow more access to certain areas of the room, and to allow

more room for maneuvering equipment including the spectrographs themselves into the

room.

Removal of the pedestals will require that they be torched off below the Main Floor level, and

then lifted out from above. The reason for this is that the pedestal bases are much larger than

the 3’-6” [42”] x 3’-6” [42”] clear openings constructed around them in the main floor (Figure

2, Figure 3 and Figure 4).


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Figure 1. LCR Floor Framing Plan Showing Points A (South) and B (North)

Figure 2. Openings in Floor 42” x 42” (Reference Drawing 2100-SOM5947-S-E-9)


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Figure 3. Point ‘A’ (South) Pedestal Base 2158-100-D1 (48” x 84”)

Figure 4. Point 'B' (North) Pedestal Base 2158-100-D2 (42" x 72")


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Additionally, before removing the Point B north pedestal, the 500 lbf capacity jib crane currently bolted to the top of the pedestal (Figure 5) will have to be removed. Removal of the crane will be detailed in the procedure below.

Figure 5. Jib Crane on North Pedestal


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8.1 Procedure for Removal of South Pedestal An elevation view of the south pedestal is shown in Figure 6. To get the pedestal out, we will cut it off below the level of the floor just low enough to allow the installation of a steel cover plate over the hole in the floor.

1. The portion of the pedestal that will be removed (if it is cut about 10 inches below the floor

surface) should weigh about 1000 lbs (Calculated from an incomplete SolidWorks model).

2. Remove the rubber seal and flashing from the floor that surrounds the pedestal.

3. Lower the cutting torch through the Coudé room floor through one of the existing floor

penetrations in the Coudé room.

4. Lower the arc welding electrode holder, ground clamp, and leads through the Coudé room

floor through one of the existing floor penetrations in the Coudé room.

5. Open the dome floor hatch, referring to procedure 2100-AD-015-0052. Remove at least the

center section; measure the forklift that will be used to determine if more need to be

removed (JHA-2).

6. Bring a forklift capable of lifting 1500 lbs up from the ground floor onto the main floor and

drive it into the LCR to lift the pedestal (JHA-3).

Note: If one of the instrument lifts in the Coudé room can be used for this instead of a

forklift, that would be acceptable. Check the capacity and stability of any equipment that will

be used.

Figure 6. Elevation Views of South Pedestal


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7. Drill and tap one ½-13UNC holes through on each side of the pedestal as shown in Figure 7.

The hole locations should be about 18 inches directly above the CG of the pedestal after it

has been cut off in the location shown.

8. Bolt on the McMaster Carr 2994T42 Pivot Hoist Rings (2500 lbs capacity each) as shown in

Figure 8. Use a 3/8 inch hex wrench.

Figure 7. South Pedestal with Floor Level and Lifting Lug Bolt Hole Locations Shown


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9. Connect two 4 ft lifting straps to the lifting eyes using shackles.

10. Loop both lifting straps over a forklift arm.

11. Tie the two taglines to the pedestal just above the floor on opposite sides of the pedestal.

12. Lift with the forklift until the weight seems to be taken by the forklift (JHA 4).

13. Go below the Coudé room floor into the hammer head and torch cut the pedestal off just

below the floor (JHA 5), using the taglines to control the load as it is lifted.

14. Lift the pedestal out of the hole with the forklift, and then take it over where the dome

crane can pick it up (JHA 6).

15. Lift the pedestal with the dome crane (5 ton) and move it down to the ground floor onto

some waiting 4” x 4” lengths of wood or onto a truck (JHA 7).

Figure 8. Pivot Hoist Ring Installed on South Pedestal


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16. Install the steel floor plate cover over the hole. Weld the plate into place (JHA 8) as

required.

Removal of the South Point A Pedestal is now complete.

8.2 Procedure for Removal of North Point B Pedestal

An elevation view of the North Pedestal is shown in Figure 10. Similarly to the South Pedestal, to

get this pedestal out, it will be cut off below the level of the floor, pulled out, then a steel cover

plate will be installed in the floor to cover the hole. The North Pedestal has the added complication

of supporting a crane which we will have to move before we can cut the pedestal off to remove it.

Figure 9. Crane Dimensions and Weight


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1. Prepare a place to lay the crane down once it has been removed.

2. Remove the rubber seal and flashing located around the pedestal hole in the floor.

3. Terminate electrical power and remove all conduit, junction boxes, crane hoist assembly,

and droplight from arm.

4. Using “SKY LIFT” scissor lift, position lift perpendicular under center of arm (“I” beam) and

raise to where the side rails of scissor lift just supports the arm (JHA 9).

5. Remove the six ¾-10 bolts that attach the arm to pedestal and slowly raise arm off pedestal

mount.

6. Secure arm and reposition scissor lift as needed and lower with arm secured to side rails.

7. With the lift in the down position the “I” beam can now be manually transferred off the

scissor lift.

Figure 10. Point 'B' North Pedestal


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8. Drill and tap one hole on either side of the pedestal in the approximate location shown in

Figure 11. These holes should be about 14 inches directly above the center of mass of the

pedestal after it has been cut off at the location shown in Figure 11.

9. Bolt the same hoist rings used for the previous pedestal, McMaster Carr part number

2994T42, to the newly drilled and tapped holes as shown in Figure 12.

Figure 11. North Pedestal ‘B’ after Crane Has Been Removed


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10. Connect a lifting strap to each hoist ring via a shackle and secure each strap to one of the

forklift forks. Lift up with the forks until the weight is taken by the forklift (JHA 10).

11. Tie the two taglines to the pedestal just above the floor on opposite sides of the pedestal.

12. Using a torch, cut the pedestal off about 10 inches below the floor (see Figure 12). Use the

two taglines to control the load as it is cut off from its base. See Figure 13 for a view of what

the Northern Pedestal looks like from in the hammer head (JHA 11).

Figure 12. North Point B Pedestal Cutoff Location


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13. Lift the pedestal out of the hole in the floor (JHA 12) and move it using the taglines to

control the load (JHA 12) to a location where it can be picked up by the crane and lowered

through the hatch to the ground floor (JHA 13).

14. Install a pre-made steel plate over the opening as was done with the cover plate over the

South Pedestal floor hole (JHA 14).

9. Procedure Review

None

10. Records

1. JHA signature sheet; kept by safety office, scanned and stored \ets_share\Safety 2. Fall protection training: kept by Safety Office 3. Rigging, suspended load: kept by Safety office

11. References

DOCUMENT NUMBER DOCUMENT TITLE

NA KPNO Emergency Manual

2158-100-D1 Point ‘A’ Pedestal Detail (South Pedestal)

2158-100-D2 Point ‘B’ Pedestal Detail (North Pedestal)

2100-SOM5947-S-E-9 Main Floor Framing Plan

2100-SOM5947-S-E-19 Optional Hammerhead Framing Plan

Figure 13. Picture of Bottom of North Pedestal

Removal of FFT Spectrograph Support Pedestals and 500 lb ...Removal Of FFT Spectrograph Support...

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