Mine Safety and Health Administration (MSHA) - Interactive Training - JTA Spiders - Longwall Move (Tear Down) Spider No.3

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	Longwall Move (Tear Down) Spider No.3
	Contact: Palmer.Melvin@dol.gov

1. 15: Preparing Shields for Rem...

Obtain and examine tools

Manually relieve pressure on e...

Listen for pressure release

Uncouple manifold lines 1 1/4"...

Take the hoses that have been ...

Remove the 3/4" plug from the ...

Remove water hose from tailgat...

Take loose end of water hose a...

Disconnect the shield to shiel...

Roll cable up, tape into roll ...

Take the chain through the rel...

Take the bridle off the base l...

Take the hose off the tailgate...

Remove the hydraulic hose off ...

Take this hose and connect it ...

Take the hose that was previou...

Lay base lift jack down on the...

Turn KN valves off on each shi...

Continue on each shield to the...

2. 16: Remove Electrical Compone...

Obtain and examine tools

Disconnect and remove all cabl...

Remove light power supply box

Continue this process for each...

3. 17: Clear the face

Contact scoop operator

Load part box in the bucket of...

Have the scoop with the box tr...

Load all loose parts in the bo...

Load boxes onto the flat car f...

4. 18: Final Set-up for Shield R...

Conduct SPSA Exam

Obtain and examine tools

Starting at the dump valve on ...

Install the first tee on the c...

Run second line from the tee t...

Set the walkers in place at ta...

Hook 1/2" hose to the face sid...

Uncouple the ring line hoses f...

Connect the hoses from walker...

Plug open ports on walker mani...

Remove the 1/2" plug from the ...

Install 10" 1/2" hose to cut o...

Install 1/2" tee with two cut ...

Install 1/2" to 3/4" fitting

Install 3/4" coupler

Disconnect the 3/4" hose from ...

5. 19: Shield Removal

Build cribs per Roof Control P...

Tram mule from track to 65 shi...

Establish cable anchor at appr...

Tram mule to the tailgate

Tram the mule back to the trac...

Tram the mule back to the tail...

Use bridle bar and d-ring chai...

Put pressure on the line shiel...

Hook GPU to shield to shield c...

Lower the shield 18" from the ...

Advance the mule and face side...

Pull mule up to the gob side w...

Advance the mule and gob side ...

Unhook mule from walker

Swing boom to the line shield

Hook D-ring to the toes of the...

Lower shield to transport leve...

Bleed pressure line between go...

Unhook pressure line from line...

Unhook GPU from line shield

Communicate with people in fac...

Lift toe of shield to raise to...

Swing mule boom until the tip ...

Retract the mule boom and pull...

Tram mule to headgate pulling ...

Build crib to replace shield t...

Load mule with roof control ma...

Repeat process for entire shie...

6. 20: Loading Shields for Trans...

Obtain and examine tools

Stop mule so the shield in tow...

Pick toe of the shield up with...

Tram duck bill scoop under shi...

Shut all equipment off

Put chain in relay bar in the ...

Notify duck bill operator and ...

Unhook bridle chains

Back mule up 5'

Swing boom left clearing shiel...

Raise boom to level of the can...

Swing boom to right to make co...

Utilize the boom to line shiel...

Ensure the ground person instr...

Return mule to tailgate to get...

Lift shield with duck bill 12"...

Approach the shield car slowly...

Get the gob side of the shield...

Lower the duck bill, allowing ...

Back the duck bill away from t...

Raise the duck bill until it t...

Swing the duck bill hard to le...

Lower the duck bill

Straighten the duck bill scoop...

Back the scoop up until you cl...

Raise the duck bill level with...

Tram forward slowly to align s...

Check height of shield for tra...

Build a crib under any canopy ...

Clean the top of shield

Bind the shield to the car uti...

Spot the next shield car

Set up for next shield

Repeat the process until shiel...

Longwall Move (Tear Down) Spider No.3

1. 15: Preparing Shields for Removal

Conduct Exam

Obtain and examine tools

Pull rope

Channel locks - 320 and 640

Hammer

Lady slipper bar

Chisel

Punch

Rock bar

Penetrating oil

Staple puller

Anti seize

15/16" socket ratchet-3/8" drive

Side cutters

Manually relieve pressure on each shield by pushing solenoid button

Listen for pressure release

Uncouple manifold lines 1 1/4" pressure lines and a 2" return on the tailgate side of each shield

Take the hoses that have been uncoupled from the tailgate side and loop back and re-couple in the shield they are attached to

See diagram

This must be uniformly done on each shield

Remove the 3/4" plug from the manifold and tape it to the looped hoses

Caution: If manifold is not opened and is pressurized, serious injury could occur

Remove water hose from tailgate side

Take loose end of water hose and put in between legs of shield

Disconnect the shield to shield cable on the tailgate side of PM 4

Pull staples

Replace staples after cable is separated

Roll cable up, tape into roll and place between legs of shield

Take the chain through the relay bar and fasten to the pin at the base lift jack

Use 15/16" socket wrench

Take the bridle off the base lift jack

Take the hose off the tailgate side of the base lift jack

Remove the hydraulic hose off the base lift jack on the headgate side at the source (headgate leg)

Take this hose and connect it to the port that is open on the base lift jack

Take the hose that was previously in the base lift jack, tailgate side, and put in open port of leg jack

See diagram

Lay base lift jack down on the relay bar

Turn KN valves off on each shields

Failure to turn the KN valve off could allow the shield tip to float down

Continue on each shield to the headgate

2. 16: Remove Electrical Components

Conduct Exam

Obtain and examine tools

Side cutters

Remove phone

Pull magnetic mounted phone from canopy

Cut phone cable

Lay on toe of shield to be recovered

Remove lights

Slide lights out of rubber mounting brackets

Unplug cable at light, splitter, and neighbor shield

Roll up cable and place on toe along with light fixtures

Disconnect and remove all cables from power supply box

Use 620 channel locks

Turn brass nut counter clockwise until it can be removed by hand

Place PVC protector on all plugs and receptacles

It protects the threads

Roll up, tape, and put on toe of shield

Remove light power supply box

Pull pin from bracket

Tilt box toward gob

Lift box out of holder

Replace the pin

Continue this process for each shield to the headgate

3. 17: Clear the face

Conduct Exam

Contact scoop operator

Load part box in the bucket of scoop

Caution: Communication between the scoop operator and employees loading the materials into the boxes is essential

Have the scoop with the box travel from tailgate to headgate

Load all loose parts in the box

SCSR

Phone

Light cables

Splitter

Lights

Fire extinguisher

Power supply boxes

Load boxes onto the flat car for transporting

Secure with chains and binders

Scoop the face

4. 18: Final Set-up for Shield Removal

Conduct SPSA Exam

Obtain and examine tools

Hammer

Screw driver

Channel locks

Chisel

Lady slipper bar

1/2" High pressure hose (1200 feet)

Ten 1/2" cut-off valves

24 to 26 couplers and 50 1/2" staples

Two 1/2" tee

One 1/2 - 3/4" male to male staple fitting

3/4" staple lock coupler

620 Scoop

Starting at the dump valve on the stage loader run 1/2" hose to tailgate with cut off valve every 100'

Install the first tee on the corner at the headgate

Run second line from the tee to the track with cut off valve on the end

Set the walkers in place at tailgate

Notify all personnel in the area of the danger of setting walking shield. Shield could slide off duckbill. Use start up signals before starting scoop and moving

Hook 1/2" hose to the face side walker

Uncouple the ring line hoses from storage on the walker shield

Connect the hoses from walker shield to other walker shield

Plug open ports on walker manifolds

Remove the 1/2" plug from the manifold of the gob side walker and install 1/2" cut off valve

Install 10" 1/2" hose to cut off valve

Install 1/2" tee with two cut off valves with one being on the hose

See diagram

Install 1/2" to 3/4" fitting

Install 3/4" coupler

Disconnect the 3/4" hose from the pressure valve on the line shield and connect to the 3/4" coupler from the walker

5. 19: Shield Removal

Conduct Exam

Build cribs per Roof Control Plan

See diagram

Tram mule from track to 65 shield with cable on machine

Establish cable anchor at approximately 65 shield

Tram mule to the tailgate

Someone must be assigned to watch the cable to be sure you have enough to reach the tailgate

Tram the mule back to the track

Someone must be assigned to watch the cable to be sure you have enough to reach the track

Someone must be assigned to watch the cable to be sure you have enough to reach the track. Before the mule returns to the tailgate the cable must be manually move to the toe of the shield

Tram the mule back to the tailgate and hook to the face side walker

Use bridle bar and d-ring chain

Use bridle bar and d-ring chain

Put pressure on the line shield

Hook GPU to shield to shield cable for shield electrical power

Lower the shield 18" from the roof

Advance the mule and face side walker within 6" of the last shield set in top

Be aware of pinch points and clo