sm 00292

AR3200C14Casing Tong

Carriage Assembly

SM00292

Service Manual

September 17, 1997

2 AR3200 Casing Tong Carriage Assembly

AR3200 Casing Tong Carriage Assembly 3

Contents

IntroductionAbout this document ............................... 5

Safety information .............................................................. 5Tool orientation.................................................................. 6

Chapter 1Description .............................................. 7

Introduction ....................................................................... 7General description ............................................................. 8

Thread Compensation System ...................................... 8Casing tong carriage equipment functions .................... 9Tong/carriage assembly hydraulic system .................... 11

Tong motor .......................................................... 11Breakout pin cylinder ........................................... 11Makeup pin cylinder ............................................. 11Flow divider .......................................................... 11Guide roller cylinders ............................................ 12

Chapter 2Installation ............................................. 13

Installing the tong/casing assembly ................................... 13

Chapter 3Operation .............................................. 15

Introduction ..................................................................... 15Preoperational checklist .................................................... 16Hydraulic cylinder operation ............................................ 17

Guide roller cylinders .................................................. 17Breakout pin cylinder ................................................. 17Makeup pin cylinder ................................................... 17

Casing joint height............................................................ 18

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Casing tong carriage assembly function tests ..................... 20Casing tong control cylinder function tests ................. 20

Center guide cylinder operation ............................ 20Center guide clamp ......................................... 20Center guide unclamp..................................... 20

Roller guide cylinder operation ............................. 21Roller guide clamp .......................................... 21Roller guide unclamp ...................................... 21

Makeup pin cylinder operation ............................. 21Breakout pin cylinder operation ............................ 21Casing tong gearshift ............................................ 22

Chapter 4Maintenance .......................................... 23

Introduction ..................................................................... 23Inspection ......................................................................... 24Lubrication ....................................................................... 25

Lubricating the guide rollers ....................................... 25Guide rollers ......................................................... 25Guide roller pivot arms ......................................... 25Center roller ......................................................... 25

Lubricating the upper tong/carriage assembly ............. 26Load cell pivot points ............................................ 26

Lubricating the Eckel 14 Hydra-Shift Casing Tong .... 26


Introduction

About this document

Safety information

Information pertaining to possible injury or equipment damageappears throughout this manual and is formatted to draw thereader’s attention to important information, a warning, or acaution note. See the examples below and pay close attention tothese important advisories.

z Indicates advisories for operational or servicing proceduresinvolving little or no risk of injury or equipment damage.

e Indicates advisories involving a risk of equipment damage.

n Indicates advisories involving a definite risk of injury to rig.

Avoid injury and equipment damage by reading this manual andrelated documents before operating, inspecting, or servicing theequipment.

September 17, 1997


Tool orientation

References to locations to the right or the left of componentsdescribed in this document assume the perspective of the AR3200automated iron roughneck itself – standing behind theroughneck and facing the well center. The front of the roughneckis defined as the closest to well center.


Chapter 1

Description

Introduction

This document describes the casing tong carriage assembly. Referto Varco’s Casing Roughneck Control Panel Assembly forinformation on the casing tong control panel.

For installation, operation or service information on the AR3200,refer to Varco’s AR3200 Automated Roughneck Service Manual.

Refer to the Eckel manuals for installation, operation or serviceinformation on Eckel Tongs.

September 17, 1997


General description

The casing tong carriage assembly is a steel frame carriage thatsupports the Eckel 14 in. Hydra-Shift hydraulic power tong. Twocarriage legs are mounted on the bottom of the casing tongcarriage assembly. They attach the assembly to the frame.

Before mounting the casing tong carriage assembly on theAR3200 carriage, the SSW-50 spinning wrench assembly must beremoved (refer to Chapter 3, Operation, of this manual). After theSSW-50 is removed, install the casing tong carriage assembly onthe AR3200 carriage by stabbing the casing tong carriageassembly legs into the SSW-50 support tubes.

Also part of the casing tong carriage assembly are the threehydraulically operated guide rollers used to align the casing withthe well. These rollers are equidistant around the circumference ofthe casing when activated.

The casing tong carriage assembly contains hydraulic quickdisconnect fittings located on a bulkhead plate on the back of theguide rollers carriage assembly. The carriage assembly alsocontains connections for the tong hydraulics: motor, breakout pinand makeup pin (Drawing 116793).

Thread Compensation SystemA pneumatic thread compensator system allows the tong carriageto move when making up casing (threading in) or when breakingout casing (threading out).

The pneumatic thread compensator system consists of twopneumatic cylinders mounted on the AR3200 carriage supporttubes. The pneumatic cylinders have a 4 in. stroke, with the rodsoriented vertically.

A regulator/filter assembly connects the cylinders to the rig airsupply via the inlet manifold. The cylinder rods push against thecarriage structure. Turning the regulator clockwise increases theair pressure required to lift the tong assembly.

The cylinders begin to lift the tong assembly when pressurereaches approximately 75 psig. The cylinders allow the tongassembly to lower when pressure decreases to 50 psig.


Casing tong carriage equipmentfunctionsThe following table describes the basic functions performed bythe casing tong carriage assembly when installed on the AR3200.

z The roughneck must be in the 2,500 psi and vertical modesduring casing operations.

Description Location

Home/Well The foot motors in the AR3200 frame feetmove the tool toward well center or awayfrom well center (home position).

Manual controlpanel

Up/Down The carriage lift cylinders in the AR3200move the carriage up and down to positionthe casing tong assembly above the casingjoint for makeup or breakout functions.

Manual controlpanel

Makeup/Breakout The tong hydraulic drive motor causesrotation of the tong rotary gear and closureof a pair of casing gripping heads to rotatethe casing in either direction.

Casing tongcontrol panel

Casing Motor SpeedControl

External control of the displacement of the2-speed hydraulic motor controls speed andtorque output of the tong. Low speedprovides more torque. The 2-speedhydraulic motor in conjunction with casingtong mechanical gear shift, provides 4-speed/torque selections.

Casing tongcontrol panel

Mechanical Gear Shift When the mechanical gear shift lever is inthe up position, the mechanical gear trainoperates in high speed; in the down positionit operates in low speed.

Casing tong

Thread Compensator A pneumatic reducing/relief valve and twoair cylinders work in parallel with the SSW-50 springs.

Relief mode: Increase pressure to raise thetong to the top of the compensator.

Reducing mode: Decrease pressure tolower the tong to the bottom of thecompensator.

There are 3 1/2" of travel available.

AR3200 carriage

September 17, 1997


BreakoutActuator Cylinder

MakeupActuator Cylinder

Gear Shift Lever

Flow Divider

Guide RollerCylinder (2)

Center Support Roller Cylinder(Underneath Tong Carriage)

Guide RollerAssembly (2)

Figure 1. Typical tong/carriage assembly


Tong/carriage assembly hydraulicsystemThe tong/carriage assembly hydraulic system includes thefollowing components:

❏ Tong motor❏ Breakout/makeup pin cylinders❏ Flow divider for guide roller cylinder❏ Guide roller cylinders

The following paragraphs describe the tong/carriage assemblyhydraulic system.

Figure 1 shows the location of the hydraulic components. Figure2 (on the next page) is a hydraulic schematic for the system.

Tong motorWith hydraulic power supplied from an external hydraulic powersupply, the 2-speed tong motor can provide torque of up to22,000 ft lb. The motor turns in one direction for makeupoperation and the other direction for breakout operation. Themotor operates at two speeds: full and half. Half speed providestwice the torque of that for full speed.

Breakout pin cylinderThe breakout pin and makeup pin operate in an exclusive-ormanner. This means one pin or the other must be engaged.During operation, both cylinders retract automatically to clearrotating parts.

Makeup pin cylinderThe makeup pin cylinder extends, inserting the backing pin inthe makeup pin hole to set up a makeup operation. The cylinderthen retracts and the pin remains in position in the hole. Thenthe tong is rotated for a makeup operation. See the breakout pincylinder description above.

Flow dividerThe flow divider splits hydraulic flow into two equal quantitieswhich are applied to the two swing guide roller cylinders. Thisallows both cylinders to clamp at the same speed.

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Guide roller cylindersThe guide roller cylinders operate guide rollers that are used toalign the casing with the drilling equipment and well centerduring drilling operations. When extended, the two guide rollercylinders swing guide rollers around the casing while the centerguide roller cylinder applies pressure to the third guide roller tocenter the casing in the tong.

Tong Motor

TP1

TP4TP5

TP10

TP7

TP3

TP14

TP15

TP11

TP12

TP13

TP6

Makeup Pin Cylinder

Breakout Pin Cylinder

Center Roller Cylinder

Guide Roller Cylinders

FlowDivider

Motor "B"

Motor "A"

Motor SpeedMotor Speed

Motor Case Drain

B/O & M/U Pin Cylinder Retract

B/O Pin Cylinder Extend

Guide Roller Retract

Guide Roller Extend

Center Roller Retract

Center Roller Extend

M/U Pin Cylinder Extend

Figure 2. Tong/carriage hydraulic schematic


Chapter 2

Installation

Installing the tong/casing assembly

Use the following procedure to install the tong/carriage assembly:

a. Remove the SSW-50 as follows:

1. Disconnect the hydraulic QDs (PRES, TANK, A and B)from the spinning wrench.

2. Disconnect the IS connection (spin out sensor) from thespinning wrench.

3. Hoist the spinning wrench off.

b. Lift the tong/carriage assembly onto the frame of the AR3200and stab legs into carriage tubes.

c. Refer to the following drawings for the installation of thecasing tong carriage assembly:

116793 Eckel Tong Carriage Hydraulic Interface

115856 Casing Tong/Carriage Assembly

108485 14 in. Hydra Shift Tong, Modified

September 17, 1997


d. Connect quick-disconnect hydraulic lines to the following:

1. Tong motor (TP1 and TP10).

2. Tong motor speed control (TP4 and TP5).

3. Breakout pin cylinder extend (TP15).

4. Makeup pin cylinder extend (TP3).

5. Makeup/breakout retract (TP14)

6. Center guide roller cylinder retract and extend (TP13 andTP6 respectively).

7. Guide roller cylinder retract and extend (TP11 and TP12respectively).

8. Motor case drain (TP7).

e. Install lift cylinder stop tubes per drawing 115856, items 65,66, 67 and 68.

n Install hydraulic cylinder stop tube P/N 117754 before operatingthe AR3200 with a casing tong assembly. Failure to install stoptubes damages equipment and can cause injury.

z The motor of the tong/carriage assembly requires a hydraulicdrain line. The motor case drain is terminated on the back of thecasing tong/carriage assembly at termination point TP7(Drawing 116793).


Chapter 3

Operation

Introduction

z For a preoperational check of the casing tong assembly, refer tothe Operation and Service Instruction manual for the Eckel 14 in.Hydrashift Casing Tong.

n Always perform open throat operations remotely to prevent apossible pinching or crushing hazard.

September 17, 1997


Preoperational checklist

Complete the following preoperational checklist (Table 1) beforeoperating the casing tong carriage assembly.

Table 1. Casing tong carriage assembly preoperational checklist

No. Inspection

1 Inspect the tong/carriage assembly for loose hardware andfittings.

2 Check the tong/carriage assembly hoses for abrasion, pinching,cracking, kinking, and excessive bending or twisting.

3 Check all hydraulic hose connections to the tong/carriageassembly hydraulic cylinders for tightness. Tighten as required.

4 Inspect the guide rollers for damage and freedom of movement.Repair or replace as required.

5 Check the thread compensation system. Verify that the cylindersraise and lower the tong carriage. The total travel is approximately3 1/2 in.

e The self-sealing hydraulic line quick disconnects (QDs) must be fullyshouldered when fastened together. If not, the self-sealing valves (checkvalves) do not open, or only partially open. This causes severe pressuredrops through the QD. The drop in pressure causes the hydraulic fluidto over heat and overload the hydraulic power supply (HPU)


Hydraulic cylinder operation

The tong/carriage assembly contains the hydraulic cylindersrequired to perform all mechanized handling of casing by thetong/casing assembly.

Guide roller cylindersThe guide roller cylinders are energized during the handling ofcasings to capture, clamp, and guide the casing. Two guide rollercylinders, when extended, cause two rollers to swing in andaround the casing while the third guide roller cylinder (centerroller cylinder) provides pressure against the casing.

Breakout pin cylinderThe breakout pin cylinder is extended when a breakout operationis to be performed. The cylinder causes the backing pin to beinserted in the breakout hole in the casing tong.

Makeup pin cylinderThe makeup pin cylinder is extended when a makeup operation isto be performed. The cylinder causes the backing pin to beinserted in the makeup hole in the casing tong.

September 17, 1997


Casing joint height

The casing tong assembly operates with a casing height range of83 to 110 in. Figure 3 defines the casing height.


83.0[2108]

110.0[2794]

TongOperating

Height89.0 [2260] Min.

116.75 [2965] Max.

Figure 3. Casing joint height

September 17, 1997


Casing tong carriage assemblyfunction tests

Perform the functional tests described below before using thecasing tong carriage assembly to ensure that the assembly isoperating properly.

The use of these functional tests assumes that the casing tong isproperly installed with all pneumatic and hydraulic requirements.

Casing tong control cylinderfunction testsThese tests check the operation of the casing tong roller guide,center guide, makeup pin, and breakout pin cylinders. Thesecylinder tests are conducted with no pipe in the jaws. The centerguide and roller clamp operate through a sequence valve, so thatthe center guide can first extend and then the roller clamping cantake place.

Center guide cylinder operationCheck for smooth operation, full range of motion, absence ofleaks.

Center guide clamp

a. Set up unit to operate the casing tong in the clamp mode.

b. Verify center guide clamping operation.

c. Verify it sequences first – before the guide rollers.

Center guide unclamp

a. Set up unit to operate the casing tong in the unclamp mode.

b. Verify center guide unclamping operation.


Roller guide cylinder operationCheck for smooth operation, full range of motion, and absenceof leaks.

Roller guide clamp

a. Set up the unit to operate the casing tong in the clampmode.

b. Verify roller guide clamping operation.

c. Verify that the flow divider synchronizes the clampingmotion.

Roller guide unclamp

a. Set up the unit to operate the casing tong in the unclampmode.

b. Verify roller guide unclamping operation.

Makeup pin cylinder operationCheck for smooth operation, full range of motion, absence ofleaks.

a. Set up unit to operate the casing tong in the makeup mode.

b. Verify makeup pin operation (makeup pin inserted andbreakout pin removed).

c. Verify that the cylinder activates and the linkage retracts afterpin insertion.

Breakout pin cylinder operationCheck for smooth operation, full range of motion, absence ofleaks.

a. Set up unit to operate the casing tong in the breakout mode.

b. Verify breakout pin operation (breakout pin inserted andmakeup pin removed).

c. Verify that the cylinder activates and the linkage retracts afterpin insertion.

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Casing tong gearshiftThe casing tong is shifted manually.

a. Operate the gearshift handle to high speed position(lever up).

b. Verify gearshift (high) operation.

c. Setup unit to operate the gearshift handle to low speedposition.

d. Verify gearshift (low) operation (lever down).

e. Verify that the tong cannot disengage – pop out of gear.


Chapter 4

Maintenance

Introduction

This section describes inspection, lubrication, and maintenanceprocedures for the casing tong carriage assembly.

September 17, 1997


Inspection

Inspect the assemblies and components listed below on a regularbasis as noted.

1. Check for loose hardware and fittings. Tighten or replace asnecessary.

2. Make sure all hydraulic hose connections are tight. Tighten asrequired.

3. Check all hydraulic hoses for abrasion, pinching, kinking,cracking, and excessive bending or twisting. To properly checkall hoses, operate the AR3200 in manual mode using allfunctions. Replace damaged hoses as required.

n Before checking hoses for damage, make sure all AR3200components are stationary.

4. Check all valves, plugs, fittings, and tubes for damage orleaks. Repair or replace as necessary.

5. Make sure all hydraulic cylinder rod end-to-clevis connectionsare properly shouldered and tight. Tighten as required.

6. Check all cylinders for damage and leaks. Repair or replace asnecessary.

e The self-sealing hydraulic line quick disconnects (QDs) must be fullyshouldered when fastened together. If not, the self-sealing valves (checkvalves) do not open, or only partially open. This causes four severepressure drops through the QD. The drop in pressure causes thehydraulic fluid to over heat and overload the hydraulic power supply(HPU)


Lubrication

The following describes how often the tong/carriage assemblycomponents require lubrication. It also provides illustrationsidentifying grease fitting locations, and a concise table listing alllubrication points and the required frequency.

Lubricating the guide rollersRefer to Figure 4 for guide roller grease fitting locations. Applygeneral purpose EP grease to all guide roller grease fittings eachtrip.

Guide rollersApply grease to the one fitting on the right guide roller and theone fitting on the left guide roller each trip.

Guide roller pivot armsApply grease to the four fittings on the two guide roller pivotarms each trip.

Center rollerApply grease to the one fitting on the center roller each trip.

September 17, 1997


Lubricating the upper tong/carriageassemblyRefer to Figure 4 for the upper portion of the carriage assembly.Apply general purpose EP grease to all grease fittings each trip(Drawing 99820).

Load cell pivot pointsApply grease to the three fittings on the load cell pivot pointsweekly.

Lubricating the Eckel 14 in.Hydra-Shift Casing TongLubrication information for the Eckel 14 in. Hydra-Shift CasingTong is contained in the Operations and Service Instructionsmanual for the casing tong.


Grease Fitting(2 Places)

Guide RollerGrease Fittings

(2 Places)


Center Guide RollerGrease Fitting

Tong Door RollerGrease Fitting

(2 Places)

Load Cell PinGrease Fitting

(2 Places)

Load CellClevis


Casing Tong Top View

Tong Carraige Assembly Bottom View

Figure 4. Lubricating the tong/carriage assembly

September 17, 1997


sm 00292

Documents

hydraulic power supply

motor case drain

severe pressure drops

roller guide unclamp

hydraulic hose connections

guide roller cylinder

roller guide clamp

guide roller cylinders